All, no clean code

Arrow.js

@@ -0,0 +1,209 @@
+export const ARROW_BODY_STYLE_CONSTANT = 1;
+export const ARROW_BODY_STYLE_LINEAR = 2;
+export const ARROW_BODY_STYLE_EXPONENTIAL = 3;
+
+const distancePerDegreeLongitude = 111.320; // 2π×6378.1km/360
+const distancePerDegreeLatitude  = 110.574; // 2π×6356.75km/360
+
+import * as turf from "@turf/turf";
+
+
+
+function round(value, decimals = 6) {
+    return Number(value.toFixed(decimals));
+}
+
+// Převod z lon/lat do Web Mercator (v metrech)
+function lonLatToMeters(lon, lat) {
+    const originShift = 2 * Math.PI * 6378137 / 2.0;
+    const mx = lon * originShift / 180.0 ;
+    const my = Math.log(Math.tan((90 + lat) * Math.PI / 360.0)) / (Math.PI / 180.0)* 150;
+
+    //console.log(JSON.stringify(mx, null, 2));
+
+    return {
+        x: mx,
+        y: my * originShift / 180.0
+    };
+}
+
+// Převod z Web Mercator zpět do lon/lat
+function metersToLonLat(mx, my) {
+    const originShift = 2 * Math.PI * 6378137 / 2.0;
+    const lon = (mx / originShift) * 180.0;
+    const lat = 180 / Math.PI * (2 * Math.atan(Math.exp(my / originShift * Math.PI / 180.0)) - Math.PI / 2);
+
+    return {
+        lon: round(lon, 6),
+        lat: round(lat, 6)
+    };
+}
+
+/**
+ * @param {Object} arrowData - Object with data for arrow
+ * @param {{x: number, y: number}[]} arrowData.points - List of points defining the arrow's path.
+ * @param {number} arrowData.splineStep - The step size for the spline interpolation.
+ * @param {number} arrowData.spacing - The spacing between the points along the arrow.
+ * @param {number} arrowData.offsetDistance - The offset distance for the arrow's path (width).
+ * 
+ * @param {Object} style - Object with data for the calculation style.
+ * @param {number} style.calculation - The style for the calculation
+ * @param {number} style.range - The range for the calculation style.
+ * @param {number} style.minValue - The minimum value used in the calculation.
+ * 
+ * @param {Object|undefined} arrowHeadData - Optional data for the arrowhead.
+ * @param {number} arrowHeadData.widthArrow - The width of the arrowhead.
+ * @param {number} arrowHeadData.lengthArrow - The length of the arrowhead.
+ * 
+ * @returns {{x: number, y: number}[]} - An array of points representing the arrow polygon.
+ */
+export function getArrowPolygon(
+    arrowData,
+    style= undefined,
+    arrowHeadData = undefined) {
+
+    if (!style)
+        style = {
+            calculation: ARROW_BODY_STYLE_CONSTANT,
+            range: 0,
+            minValue: 0
+        };
+
+    const splinePoints = computeSplinePoints(arrowData.points, arrowData.splineStep);
+    const { leftSidePoints, rightSidePoints }  = computeSides(splinePoints, arrowData.spacing, arrowData.offsetDistance, style);
+    const arrowHead= arrowHeadData
+    ? createIsoscelesTriangleFromSpline(splinePoints, arrowHeadData.widthArrow, arrowHeadData.lengthArrow)
+    : [];
+    
+    const fullPolygon = [...leftSidePoints, ...arrowHead.reverse(), ...rightSidePoints.reverse()];
+    return fullPolygon;
+}
+
+function computeSplinePoints(points, splineStep) {
+    let splinePoints = [];
+
+    for (let i = 0; i < points.length - 1; i++) {
+        const p0 = points[i === 0 ? i : i - 1];
+        const p1 = points[i];
+        const p2 = points[i + 1];
+        const p3 = points[i + 2] || p2;
+        for (let t = 0; t <= 1; t += splineStep) {
+            splinePoints.push({
+                x: cubicInterpolate([p0.x, p1.x, p2.x, p3.x], t),
+                y: cubicInterpolate([p0.y, p1.y, p2.y, p3.y], t)
+            });
+        }
+    }
+    splinePoints.x /100;
+    return splinePoints;
+}
+
+function computeSides(splinePoints, spacing, offsetDistance, style) {
+
+    let leftSidePoints = [];
+    let rightSidePoints = [];
+    let accumulatedDistance = 0;
+
+    for (let i = 1; i < splinePoints.length; i++) {
+        const previousPoint = splinePoints[i - 1];
+        const currentPoint = splinePoints[i];
+        const segmentLength = Math.hypot(currentPoint.x - previousPoint.x, currentPoint.y - previousPoint.y);
+
+        accumulatedDistance += segmentLength;
+
+        if (accumulatedDistance >= spacing || i === 1 || i === splinePoints.length - 1) {
+            let distanceX;
+            let distanceY;
+            if (i == 1 || i == splinePoints.length-1)
+            {
+                distanceX = (currentPoint.y - previousPoint.y);
+                distanceY = (previousPoint.x - currentPoint.x);
+            }else
+            {
+                distanceX = (currentPoint.y - previousPoint.y) ;
+                distanceY = (previousPoint.x - currentPoint.x) ;
+            }
+            const length = Math.hypot(distanceX, distanceY);
+            const normalizedPosition = i / (splinePoints.length - 1);
+            
+            let localOffsetDistance;
+
+            switch (style.calculation) {
+                case ARROW_BODY_STYLE_LINEAR:
+                    localOffsetDistance = offsetDistance * linearWidthCurve(normalizedPosition, style.range, style.minValue);
+                    break;
+                case ARROW_BODY_STYLE_EXPONENTIAL:
+                    localOffsetDistance = offsetDistance * exponentialWidthCurve(normalizedPosition, style.range, style.minValue);
+                    break;
+                case ARROW_BODY_STYLE_CONSTANT:
+                default:
+                    localOffsetDistance = offsetDistance;
+            }
+
+            const offsetX = (distanceX / length) * localOffsetDistance;
+            const offsetY = (distanceY / length) * localOffsetDistance;
+
+            accumulatedDistance = 0;
+            leftSidePoints.push({ x: currentPoint.x + offsetX , y: currentPoint.y + offsetY });
+            rightSidePoints.push({ x: currentPoint.x - offsetX , y: currentPoint.y - offsetY });
+        }
+    }
+    
+    return { leftSidePoints, rightSidePoints };
+}
+
+function createIsoscelesTriangleFromSpline(splinePoints, baseLengthMeters, heightMeters) {
+    if (splinePoints.length < 2) {
+        throw new Error("Potřeba alespoň dva body ve splinePoints");
+    }
+
+    const last = splinePoints[splinePoints.length - 1];
+    const prev = splinePoints[splinePoints.length - 2];
+
+    // Vektor směru (bearing)
+    const dx = last.x - prev.x;
+    const dy = last.y - prev.y;
+    const bearing = (Math.atan2(dx, dy) * 180 / Math.PI + 360) % 360;
+
+    const center = [last.x, last.y]; // GeoJSON formát: [lon, lat]
+
+    const halfBase = baseLengthMeters / 2*100000;
+
+    const leftBase = turf.destination(center, halfBase, bearing - 90, { units: 'meters' });
+    const rightBase = turf.destination(center, halfBase, bearing + 90, { units: 'meters' });
+    const apex = turf.destination(center, heightMeters*100000, bearing, { units: 'meters' });
+    
+    return [
+        { x: leftBase.geometry.coordinates[0], y: leftBase.geometry.coordinates[1] },
+        { x: apex.geometry.coordinates[0],      y: apex.geometry.coordinates[1] },
+        { x: rightBase.geometry.coordinates[0], y: rightBase.geometry.coordinates[1] }
+    ];
+}
+
+
+function computeArrowHead(splinePoints, width, length) {
+    const len = splinePoints.length;
+    const lastPoint = splinePoints[len - 1];
+    const secondLastPoint = splinePoints[len - 2];
+    //const x = (lastPoint.x - secondLastPoint.x);
+    //const y = (lastPoint.y - secondLastPoint.y);
+    const x = (lastPoint.x - secondLastPoint.x) ;
+    const y = (lastPoint.y - secondLastPoint.y) ;
+    const magnitude = Math.hypot(x, y);
+    const normalizedX = x / magnitude;
+    const normalizedY = y / magnitude;
+
+    return [
+        { x: lastPoint.x - normalizedY * width , y: lastPoint.y + normalizedX * width},
+        { x: (lastPoint.x + normalizedX) * length, y: (lastPoint.y + normalizedY) * length},
+        { x: lastPoint.x + normalizedY * width , y: lastPoint.y - normalizedX * width},
+    ];
+}
+
+function exponentialWidthCurve(normalizedPosition, range = 5, minValue = 0.1) {
+    return minValue + (1 - minValue) * Math.exp(-range * normalizedPosition); 
+}
+
+function linearWidthCurve(normalizedPosition, range = 1, minValue = 0.1) {
+    return 1 + (minValue - 1) * normalizedPosition / range ;
+}

ArrowPoints.js

@@ -1,16 +1,16 @@
 const canvas = document.getElementById("canvas");
 // Compute arrow polygon
-import { getArrowPolygon } from "athena-utils/shape/Arrow.js";
+import { getArrowPolygon } from "./Arrow.js";
-import { ARROW_BODY_STYLE_CONSTANT, ARROW_BODY_STYLE_LINEAR, ARROW_BODY_STYLE_EXPONENTIAL } from "athena-utils/shape/Arrow.js";
+import { ARROW_BODY_STYLE_CONSTANT, ARROW_BODY_STYLE_LINEAR, ARROW_BODY_STYLE_EXPONENTIAL } from "./Arrow.js";
-import { getCirclePolygon } from "athena-utils/shape/BasicShapes.js";
+import { getCirclePolygon } from "./BasicShapes.js";
-import { getRectanglePolygon } from "athena-utils/shape/BasicShapes.js";
+import { getRectanglePolygon } from "./BasicShapes.js";
-import { getFrontline } from "athena-utils/shape/Frontline.js";
+import { getFrontline } from "./Frontline.js";
-import { LEFT_SIDE, RIGHT_SIDE, BOTH_SIDES } from "athena-utils/shape/Frontline.js";
+import { LEFT_SIDE, RIGHT_SIDE, BOTH_SIDES } from "./Frontline.js";
 // Polygon merge using Turf library
-import {mergeTurfPolygons} from "athena-utils/shape/Polygon.js";
+import {mergeTurfPolygons} from "./Polygon.js";
-import {addTurfPolygonToMerge} from "athena-utils/shape/Polygon.js";
+import {addTurfPolygonToMerge} from "./Polygon.js";
-import {toTurfPolygon} from "athena-utils/shape/Polygon.js";
+import {toTurfPolygon} from "./Polygon.js";
-import {drawPolygon} from "athena-utils/shape/PolygonVisuals.js";
+import {drawPolygon} from "./PolygonVisuals.js";
 
 const circleCenter = {x:320, y:180};
 const circleRadius = 70;

BasicShapes.js

@@ -0,0 +1,137 @@
+const distancePerDegreeLongitude = 111.320; // 2π×6378.1km/360
+const distancePerDegreeLatitude  = 110.574; // 2π×6356.75km/360
+
+import * as turf from "@turf/turf";
+import { toMercator, toWgs84 } from '@turf/projection';
+
+/**
+ * @param {Object} center - The center point of the circle.
+ * @param {number} center.x
+ * @param {number} center.y
+ * @param {number} radius - The radius of the circle.
+ * @param {number} density - The number of points used to approximate the circle.
+ * 
+ * @returns {Object} GeoJSON Feature representing the circle polygon.
+ */
+export function getCirclePolygon(center, radius, density = 64) {
+    const points = [];
+
+    const coords = {
+        latitude: center[1], // Latitude
+        longitude: center[0] // Longitude
+    };
+
+    const distanceX = radius / (distancePerDegreeLongitude * Math.cos(coords.latitude * Math.PI / 180));
+    const distanceY = radius / distancePerDegreeLatitude;
+
+    for (let i = 0; i < density; i++) {
+        const angle = (i / density) * Math.PI * 2;
+        const x = distanceX * Math.cos(angle);
+        const y = distanceY * Math.sin(angle);
+        points.push([coords.longitude + x, coords.latitude + y]);
+    }
+
+    // Close the circle by adding the first point again
+    points.push(points[0]);
+
+    return {
+        type: "Feature",
+        geometry: {
+            type: "Polygon",
+            coordinates: [points]
+        },
+        properties: {}
+    };
+}
+
+function getDistancePerDegreeLongitude(latitude) {
+    return 111.320 * Math.cos(latitude * Math.PI / 180);
+}
+
+/**
+ * @param {Object} center - The center point of the rectangle.
+ * @param {number} center.x
+ * @param {number} center.y
+ * @param {number} sideA - The length of the first side of the rectangle.
+ * @param {number} sideB - The length of the second side of the rectangle.
+ * @param {number} rotation - The angle (in radians) by which to rotate the rectangle.
+ * 
+ * @returns {Object} GeoJSON Feature representing the rectangle polygon.
+ */
+export function getRectanglePolygon(center, width, height, rotation = 0) {
+  const widthMeters = width * 1000 ;
+  const heightMeters = height * 1000;
+
+  // 1. Střed převedeme do metrického systému (Web Mercator)
+  const centerMerc = toMercator(turf.point(center)).geometry.coordinates;
+
+  // 2. Vypočítáme rohy čtverce v metrech
+  const halfWidth = widthMeters / 2;
+  const halfHeight = heightMeters / 2;
+
+  let corners = [
+    [centerMerc[0] - halfWidth, centerMerc[1] + halfHeight], // topLeft
+    [centerMerc[0] + halfWidth, centerMerc[1] + halfHeight], // topRight
+    [centerMerc[0] + halfWidth, centerMerc[1] - halfHeight], // bottomRight
+    [centerMerc[0] - halfWidth, centerMerc[1] - halfHeight], // bottomLeft
+  ];
+
+  // 3. Otočení (volitelně)
+  if (rotation !== 0) {
+    const rad = (rotation * Math.PI) / 180;
+    corners = corners.map(([x, y]) => rotateXY(x, y, centerMerc[0], centerMerc[1], rad));
+  }
+
+  // 4. Uzavřeme polygon a převedeme zpět do WGS84
+  corners.push(corners[0]);
+  const wgsCoords = corners.map(([x, y]) => toWgs84([x, y]));
+
+  return turf.polygon([wgsCoords]);
+}
+
+function rotateXY(x, y, cx, cy, angleRad) {
+  const dx = x - cx;
+  const dy = y - cy;
+  const cos = Math.cos(angleRad);
+  const sin = Math.sin(angleRad);
+  const rx = cx + dx * cos - dy * sin;
+  const ry = cy + dx * sin + dy * cos;
+  return [rx, ry];
+}
+    /*
+    const [lon, lat] = center;
+
+    // Přepočet metrů na stupně:
+    const degLat = height / distancePerDegreeLatitude / 2;
+    const degLon = width / (distancePerDegreeLongitude * Math.cos(lat * Math.PI / 180)) / 2;
+
+    // Rohy bez rotace (v relative souřadnicích)
+    const corners = [
+        [-degLon, -degLat],
+        [ degLon, -degLat],
+        [ degLon,  degLat],
+        [-degLon,  degLat]
+    ];
+
+    // Rotace a posun
+    const rotated = corners.map(([dx, dy]) => {
+        const x = dx;
+        const y = dy;
+
+        const rotatedX = x * Math.cos(rotation) - y * Math.sin(rotation);
+        const rotatedY = x * Math.sin(rotation) + y * Math.cos(rotation);
+
+        return [lon + rotatedX, lat + rotatedY];
+    });
+
+    // Uzavření polygonu
+    rotated.push(rotated[0]);
+
+    return {
+        type: "Feature",
+        geometry: {
+            type: "Polygon",
+            coordinates: [rotated]
+        },
+        properties: {}
+    };*/

Frontline.js

@@ -0,0 +1,193 @@
+// Cubic interpolation source from https://www.paulinternet.nl/?page=bicubic
+function cubicInterpolate(p, x) {
+    return p[1] + 0.5 * x * (p[2] - p[0] + x * (2.0 * p[0] - 5.0 * p[1] + 4.0 * p[2] - p[3] + x * (3.0 * (p[1] - p[2]) + p[3] - p[0])));
+}
+
+export const LEFT_SIDE = 1;
+export const RIGHT_SIDE = 2;
+export const BOTH_SIDES = 3;
+
+/**
+ * @param {Object} arrowData - Object with data for arrow
+ * @param {{x: number, y: number}[]} arrowData.points - List of points defining the arrow's path.
+ * @param {number} arrowData.splineStep - The density factor for the arrow's points.
+ * @param {number} arrowData.spacing - The spacing between the points along the arrow.
+ * @param {number} arrowData.offsetDistance - The offset distance for the arrow's path (width).
+ * @param {number} arrowData.protrusionSize - Length of the square protrusion from the offset side.
+ *
+ * @returns {{x: number, y: number}[]} - An array of points representing the arrow polygon.
+ */
+export function getFrontline(protrusionData) {
+    const style = protrusionData.style ?? LEFT_SIDE;
+    const splinePoints = computeSplinePoints(protrusionData.points, protrusionData.splineStep);
+
+    let bodyPolygonLeft = [];
+    let bodyPolygonRight = [];
+
+    if (style === BOTH_SIDES) {
+        const {
+            leftSidePoints: leftSidePointsLeftSide,
+            rightSidePoints: rightSidePointsLeftSide
+        } = computeSides(splinePoints, protrusionData.spacing, protrusionData.offsetDistance, LEFT_SIDE);
+    bodyPolygonLeft = [...leftSidePointsLeftSide, ...rightSidePointsLeftSide.reverse()];
+
+        const {
+            leftSidePoints: leftSidePointsRightSide,
+            rightSidePoints: rightSidePointsRightSide
+        } = computeSides(splinePoints, protrusionData.spacing, protrusionData.offsetDistance, RIGHT_SIDE);
+    bodyPolygonRight = [...leftSidePointsRightSide, ...rightSidePointsRightSide.reverse()];
+    }
+
+    const { leftSidePoints, rightSidePoints } = computeSides(splinePoints, protrusionData.spacing, protrusionData.offsetDistance, protrusionData.style);
+    
+    const bodyPolygon = [...leftSidePoints, ...rightSidePoints.reverse()];
+
+    let protrusionPolygons = [];
+
+
+    if (style === LEFT_SIDE) {
+    protrusionPolygons = computeProtrusion(leftSidePoints, protrusionData);
+    } else if (style === RIGHT_SIDE) {
+    protrusionPolygons = computeProtrusion(rightSidePoints, protrusionData);
+    } else if (style === BOTH_SIDES){
+    let protrusionPolygonsLeft = computeProtrusion(leftSidePoints, protrusionData);
+    let protrusionPolygonsRight = computeProtrusion(rightSidePoints, protrusionData);
+    //protrusionPolygonsA = [...computeProtrusion(leftSidePoints, protrusionData), ...computeProtrusion(rightSidePoints, protrusionData)];
+     return {
+        bodyLeft: bodyPolygonLeft,
+        bodyRight: bodyPolygonRight,
+        protrusionsLeft: protrusionPolygonsLeft,
+        protrusionsRight: protrusionPolygonsRight
+    };
+    }
+
+    return {
+        body: bodyPolygon,
+        protrusions: protrusionPolygons
+    };
+}
+
+function computeSplinePoints(points, density) {
+    let splinePoints = [];
+
+    for (let i = 0; i < points.length - 1; i++) {
+        const p0 = points[i === 0 ? i : i - 1];
+        const p1 = points[i];
+        const p2 = points[i + 1];
+        const p3 = points[i + 2] || p2;
+        for (let t = 0; t <= 1; t += density) {
+            splinePoints.push({
+                x: cubicInterpolate([p0.x, p1.x, p2.x, p3.x], t),
+                y: cubicInterpolate([p0.y, p1.y, p2.y, p3.y], t)
+            });
+        }
+    }
+
+    return splinePoints;
+}
+
+function computeSides(splinePoints, spacing, offsetDistance, style = LEFT_SIDE) {
+    let dots = [];
+    let leftSidePoints = [];
+    let rightSidePoints = [];
+    let accumulatedDistance = 0;
+
+    for (let i = 1; i < splinePoints.length; i++) {
+        const previousPoint = splinePoints[i - 1];
+        const currentPoint = splinePoints[i];
+        const segmentLength = Math.hypot(currentPoint.x - previousPoint.x, currentPoint.y - previousPoint.y);
+        accumulatedDistance += segmentLength;
+        if (accumulatedDistance >= spacing || i === 1 || i === splinePoints.length - 1) {
+            const distanceX = currentPoint.y - previousPoint.y;
+            const distanceY = previousPoint.x - currentPoint.x;
+            const length = Math.hypot(distanceX, distanceY);
+            
+            let localOffsetDistance = offsetDistance;
+
+            const offsetX = (distanceX / length) * localOffsetDistance;
+            const offsetY = (distanceY / length) * localOffsetDistance;
+
+            dots.push({ x: currentPoint.x + offsetX, y: currentPoint.y + offsetY });
+            dots.push({ x: currentPoint.x - offsetX, y: currentPoint.y - offsetY });
+
+            accumulatedDistance = 0;
+
+            if (style === LEFT_SIDE) {
+                leftSidePoints.push({ x: currentPoint.x + offsetX, y: currentPoint.y + offsetY});
+                rightSidePoints.push({ x: currentPoint.x, y: currentPoint.y});
+            } else if (style === RIGHT_SIDE) {
+                leftSidePoints.push({ x: currentPoint.x, y: currentPoint.y});
+                rightSidePoints.push({ x: currentPoint.x - offsetX, y: currentPoint.y - offsetY});
+            } else if (style === BOTH_SIDES) {
+                leftSidePoints.push({ x: currentPoint.x + offsetX, y: currentPoint.y + offsetY });
+                rightSidePoints.push({ x: currentPoint.x - offsetX, y: currentPoint.y - offsetY});
+            }
+        }
+    }
+    
+    return { leftSidePoints, rightSidePoints };
+}
+
+function computeProtrusion(leftSidePoints, protrusionData) {
+    let protrusions = [];
+
+    const segments = [];
+    let totalLength = 0;
+
+    for (let i = 0; i < leftSidePoints.length - 1; i++) {
+        const p0 = leftSidePoints[i];
+        const p1 = leftSidePoints[i + 1];
+        const dx = p1.x - p0.x;
+        const dy = p1.y - p0.y;
+        const length = Math.hypot(dx, dy);
+        segments.push({ p0, p1, dx, dy, length });
+        totalLength += length;
+    }
+
+    const positions = [];
+    
+    for (let d = 0; d <= totalLength - (protrusionData.protrusionGap + protrusionData.protrusionStartSize); d += protrusionData.protrusionGap) {
+        positions.push(d + protrusionData.protrusionStartSize);
+    }
+    if (positions[positions.length - 1] < totalLength) {
+        positions.push(totalLength - protrusionData.protrusionStartSize);
+    }
+
+    let currentSegmentIndex = 0;
+    let currentSegmentPos = 0;
+
+    for (const distance of positions) {
+        while (currentSegmentIndex < segments.length &&
+               currentSegmentPos + segments[currentSegmentIndex].length < distance) {
+            currentSegmentPos += segments[currentSegmentIndex].length;
+            currentSegmentIndex++;
+        }
+
+        if (currentSegmentIndex >= segments.length) break;
+
+        const seg = segments[currentSegmentIndex];
+        const localDistance = distance - currentSegmentPos;
+        const t = localDistance / seg.length;
+
+        const x = seg.p0.x + seg.dx * t;
+        const y = seg.p0.y + seg.dy * t;
+
+        const nx = -seg.dy / seg.length;
+        const ny = seg.dx / seg.length;
+
+        const centerX = x - nx * protrusionData.protrusionLength;
+        const centerY = y - ny * protrusionData.protrusionLength;
+
+        const ux = seg.dx / seg.length;
+        const uy = seg.dy / seg.length;
+
+        const corner1 = { x: x - ux * protrusionData.protrusionStartSize - nx * 0, y: y - uy * protrusionData.protrusionStartSize - ny * 0 };
+        const corner2 = { x: x + ux * protrusionData.protrusionStartSize - nx * 0, y: y + uy * protrusionData.protrusionStartSize - ny * 0 };
+        const corner3 = { x: centerX + ux * protrusionData.protrusionEndSize, y: centerY + uy * protrusionData.protrusionEndSize };
+        const corner4 = { x: centerX - ux * protrusionData.protrusionEndSize, y: centerY - uy * protrusionData.protrusionEndSize };
+
+        protrusions.push([corner1, corner2, corner3, corner4]);
+    }
+
+    return protrusions;
+}

Map.js

@@ -0,0 +1,740 @@
+mapboxgl.accessToken = 'pk.eyJ1Ijoib3V0ZG9vcm1hcHBpbmdjb21wYW55IiwiYSI6ImNqYmh3cDdjYzNsMnozNGxsYzlvMmk2bTYifQ.QqcZ4LVoLWnXafXdjZxnZg';
+    const map = new mapboxgl.Map({
+        container: 'map',
+        center: [20, 80],
+        zoom: 4
+    });
+
+import * as turf from "@turf/turf";
+
+import { getArrowPolygon } from "./Arrow.js";
+import { ARROW_BODY_STYLE_CONSTANT, ARROW_BODY_STYLE_LINEAR, ARROW_BODY_STYLE_EXPONENTIAL } from "./Arrow.js";
+import { getCirclePolygon } from "./BasicShapes.js";
+import { getRectanglePolygon } from "./BasicShapes.js";
+import { getFrontline } from "./Frontline.js";
+import { LEFT_SIDE, RIGHT_SIDE, BOTH_SIDES } from "./Frontline.js";
+// Polygon merge using Turf library
+import {mergeTurfPolygons} from "./Polygon.js";
+import {addTurfPolygonToMerge} from "./Polygon.js";
+import {toTurfPolygon} from "./Polygon.js";
+
+const circleCenter = {x:320, y:180};
+const circleRadius = 70;
+const circleDensity = 15;
+
+const circleCenterB = {x:400, y:280};
+const circleRadiusB = 70;
+const circleDensityB = 15;
+
+const rectangleCenter= {x:100, y:300};
+const rectangleSideA = 70;
+const rectangleSideB = 200;
+const rectangleRotation = 40;
+
+const frontlinePointsA = [
+    { x: 120, y: 400 },
+    { x: 200, y: 100 },
+    { x: 350, y: 200 },
+    { x: 350, y: 400 },
+    { x: 450, y: 480 },
+    { x: 550, y: 440 },
+    { x: 600, y: 300 },
+];
+
+const frontlinePointsB = [
+    { x: 420, y: 280 },
+    { x: 430, y: 380 },
+    { x: 500, y: 400 },
+    { x: 520, y: 300 },
+];
+
+const frontlinePointsC = [
+    { x: 450, y: 200 },
+    { x: 500, y: 250 },
+    { x: 550, y: 250 },
+    { x: 550, y: 200 }
+];
+
+
+const frontlineDataA = {
+    points: frontlinePointsA,
+    splineStep: 0.08,
+    spacing: 10,
+    offsetDistance: 10,
+    protrusionLength: 15,
+    protrusionStartSize: 5,
+    protrusionEndSize: 2,
+    protrusionGap: 20,
+    style: LEFT_SIDE,
+  };
+
+  const frontlineDataB = {
+    points: frontlinePointsB,
+    splineStep: 0.02,
+    spacing: 10,
+    offsetDistance: 10,
+    protrusionLength: 15,
+    protrusionStartSize: 5,
+    protrusionEndSize: 5,
+    protrusionGap: 20,
+    style: RIGHT_SIDE,
+  };
+
+  const frontlineDataC = {
+    points: frontlinePointsC,
+    splineStep: 0.02,
+    spacing: 10,
+    offsetDistance: 10,
+    protrusionLength: 15,
+    protrusionStartSize: 5,
+    protrusionEndSize: 0,
+    protrusionGap: 20,
+    style: BOTH_SIDES,
+  };
+
+/*
+const arrowPolygonA = getArrowPolygon(arrowDataA, styleA, arrowHeadDataA);
+const arrowPolygonB = getArrowPolygon(arrowDataB, styleB, arrowHeadDataB);
+const arrowPolygonC = getArrowPolygon(arrowDataC, styleC);
+
+const circlePolygon = getCirclePolygon(circleCenter, circleRadius, circleDensity);
+const circlePolygonB = getCirclePolygon(circleCenterB, circleRadiusB, circleDensityB);
+const rectanglePolygon = getRectanglePolygon(rectangleCenter, rectangleSideA, rectangleSideB, rectangleRotation);
+
+const mergedTurfPoly = mergeTurfPolygons(arrowPolygonA, arrowPolygonC);
+const mergedTurfPolyAll = addTurfPolygonToMerge(mergedTurfPoly, arrowPolygonB);
+
+const mergedTurfPolyRectangle = addTurfPolygonToMerge(mergedTurfPolyAll, rectanglePolygon);
+const mergedRectangle = mergeTurfPolygons(circlePolygon, circlePolygonB);
+
+const rectanglePoly = getRectanglePolygon(circleCenter, rectangleSideA, rectangleSideB, rectangleRotation*-1);
+const rectangleToTurfPoly = toTurfPolygon(rectanglePoly);
+
+const frontlinePolygonA = getFrontline(frontlineDataA);
+let frontlinePolygonMergedA = mergeTurfPolygons(frontlinePolygonA.body,frontlinePolygonA.protrusions[0]);
+for (let i = 1; i < frontlinePolygonA.protrusions.length; i++) 
+{
+    frontlinePolygonMergedA = addTurfPolygonToMerge(frontlinePolygonMergedA, frontlinePolygonA.protrusions[i]);
+}
+
+const frontlinePolygonB = getFrontline(frontlineDataB);
+let frontlinePolygonMergedB = mergeTurfPolygons(frontlinePolygonB.body,frontlinePolygonB.protrusions[0]);
+for (let i = 1; i < frontlinePolygonB.protrusions.length; i++) 
+{
+    frontlinePolygonMergedB = addTurfPolygonToMerge(frontlinePolygonMergedB, frontlinePolygonB.protrusions[i]);
+}
+
+const frontlinePolygonC = getFrontline(frontlineDataC);
+
+let frontlinePolygonMergedLeft = mergeTurfPolygons(frontlinePolygonC.bodyLeft, frontlinePolygonC.protrusionsLeft[0]);
+for (let i = 1; i < frontlinePolygonC.protrusionsLeft.length; i++) {
+    frontlinePolygonMergedLeft = addTurfPolygonToMerge(frontlinePolygonMergedLeft, frontlinePolygonC.protrusionsLeft[i]);
+}
+
+let frontlinePolygonMergedRight = mergeTurfPolygons(frontlinePolygonC.bodyRight, frontlinePolygonC.protrusionsRight[0]);
+for (let i = 1; i < frontlinePolygonC.protrusionsRight.length; i++) {
+    frontlinePolygonMergedRight = addTurfPolygonToMerge(frontlinePolygonMergedRight, frontlinePolygonC.protrusionsRight[i]);
+}*/
+
+//const circleGeoJSON = getCircleGeoJSON({x: 20, y: 80}, 2, 50, map);
+
+const pointsB = [
+    { x: 70, y: 38 },
+    { x: 71, y: 45},
+    { x: 65, y: 50 },
+    { x: 70, y: 53}
+];
+
+const arrowDataB = {
+    points: pointsB,
+    splineStep: 0.01,
+    spacing: 0.01,
+    offsetDistance: 1
+  };
+  const styleB = {
+    calculation: ARROW_BODY_STYLE_LINEAR,
+    range: 1,
+    minValue: 0.1
+  };
+  const arrowHeadDataB = {
+    widthArrow: 1,
+    lengthArrow: 1
+  };
+
+const arrowPolygonB = getArrowPolygon(arrowDataB, styleB, arrowHeadDataB);
+  const pointsC= [
+    { x: 50, y: 38 },
+    { x: 51, y: 45},
+    { x: 45, y: 50 },
+    { x: 48, y: 55}
+];
+
+const arrowDataC = {
+    points: pointsC,
+    splineStep: 0.02,
+    spacing: 1,
+    offsetDistance: 1
+  };
+  const styleC = {
+    calculation: ARROW_BODY_STYLE_LINEAR,
+    range: 1,
+    minValue: 0.1
+  };
+  const arrowHeadDataC = {
+    widthArrow: 1,
+    lengthArrow: 1
+  };
+
+const arrowPolygonC = getArrowPolygon(arrowDataC, styleC, arrowHeadDataC);
+
+const points = [
+    { x: 80, y: 20 },
+    { x: 81, y: 22},
+    { x: 82, y: 28 },
+    { x: 81, y: 30},
+    { x: 80, y: 20}
+];
+
+// Turf polygon
+const turfPolygon = turf.polygon([[
+      [20, 80],
+      [22, 81],
+      [28, 82],
+      [30, 81],
+      [20, 80]
+    ]]);
+
+  const pointsA= [
+    { x: 80, y: 38 },
+    { x: 81, y: 45},
+    { x: 75, y: 50 },
+    { x: 78, y: 55}
+];
+
+const arrowDataA = {
+    points: pointsA,
+    splineStep: 0.2,
+    spacing: 3,
+    offsetDistance: 1
+  };
+  const styleA = {
+    calculation: ARROW_BODY_STYLE_LINEAR,
+    range: 1,
+    minValue: 0.1
+  };
+  const arrowHeadDataA = {
+    widthArrow: 1,
+    lengthArrow: 1
+  };
+
+const arrowPolygonA = getArrowPolygon(arrowDataA, styleA, arrowHeadDataA);
+
+const latLonGrid = generateLatLonGrid(5);
+
+
+function createIsoscelesTriangle(center, baseLengthMeters, heightMeters, bearing = 0) {
+    const halfBase = baseLengthMeters / 2;
+
+    // Výpočet bodů základny (levý a pravý bod)
+    const leftBase = turf.destination(center, halfBase, bearing - 90, { units: 'meters' });
+    const rightBase = turf.destination(center, halfBase, bearing + 90, { units: 'meters' });
+
+    // Výpočet vrcholu trojúhelníku – směr daný bearing (nahoru např. 0°)
+    const apex = turf.destination(center, heightMeters, bearing, { units: 'meters' });
+
+    const triangle = turf.polygon([[
+        leftBase.geometry.coordinates,
+        rightBase.geometry.coordinates,
+        apex.geometry.coordinates,
+        leftBase.geometry.coordinates // Uzavření polygonu
+    ]]);
+
+    return triangle;
+}
+
+
+
+
+
+function cubicInterpolate(p, x) {
+    return p[1] + 0.5 * x * (p[2] - p[0] + x * (2.0 * p[0] - 5.0 * p[1] + 4.0 * p[2] - p[3] + x * (3.0 * (p[1] - p[2]) + p[3] - p[0])));
+}
+
+function interpolatePointsCatmullRom(points, segments = 10) {
+        if (points.length < 2) return points;
+
+        const extended = [points[0], ...points, points[points.length - 1]];
+        const interpolated = [];
+
+        for (let i = 1; i < extended.length - 2; i++) {
+            for (let j = 0; j < segments; j++) {
+                const t = j / segments;
+                const lon = cubicInterpolate([extended[i - 1][0], extended[i][0], extended[i + 1][0], extended[i + 2][0]], t);
+                const lat = cubicInterpolate([extended[i - 1][1], extended[i][1], extended[i + 1][1], extended[i + 2][1]], t);
+                interpolated.push([lon, lat]);
+            }
+        }
+        interpolated.push(points[points.length - 1]);
+        return interpolated;
+    }
+ function computeSideOffsets(points, offsetMeters) {
+        const left = [];
+        const right = [];
+
+        for (let i = 1; i < points.length; i++) {
+            const prev = points[i - 1];
+            const curr = points[i];
+            const bearing = turf.bearing(turf.point(prev), turf.point(curr));
+
+            const leftOffset = turf.destination(turf.point(curr), offsetMeters, bearing - 90, { units: 'meters' });
+            const rightOffset = turf.destination(turf.point(curr), offsetMeters, bearing + 90, { units: 'meters' });
+
+            left.push(leftOffset.geometry.coordinates);
+            right.push(rightOffset.geometry.coordinates);
+        }
+
+        return { left, right };
+    }
+
+    function createIsoscelesTriangleCoords(center, baseLengthMeters, heightMeters, bearing) {
+        const halfBase = baseLengthMeters / 2;
+        const left = turf.destination(center, halfBase, bearing - 90, { units: 'meters' }).geometry.coordinates;
+        const right = turf.destination(center, halfBase, bearing + 90, { units: 'meters' }).geometry.coordinates;
+        const tip = turf.destination(center, heightMeters, bearing, { units: 'meters' }).geometry.coordinates;
+        console.log("Aktuální bod:", left);
+        console.log("Aktuální bod:", right);
+        console.log("Aktuální bod:", tip);
+        return [left, right, tip];
+    }
+
+    function drawArrowPolygon(map, basePoints, offset = 10000) {
+        const smooth = interpolatePointsCatmullRom(basePoints, 20);
+        const { leftSidePoints, rightSidePoints } = computeSidesWGS84(smooth, offset);
+
+        console.log("Aktuální bod:", tip);
+        const end = smooth[smooth.length - 1];
+        const prev = smooth[smooth.length - 2];
+        const bearing = turf.bearing(turf.point(prev), turf.point(end));
+
+        const triangleCoords = createIsoscelesTriangleCoords(turf.point(end), offset * 2, offset * 3, bearing);
+
+        const polygonCoords = [
+            ...leftSidePoints,
+            ...triangleCoords,
+            ...rightSidePoints.reverse(),
+            leftSidePoints[0]
+        ];
+
+        const fullPolygon = turf.polygon([[...polygonCoords]]);
+
+        map.addSource("arrow-shape", {
+            type: "geojson",
+            data: fullPolygon
+        });
+
+        map.addLayer({
+            id: "arrow-shape",
+            type: "fill",
+            source: "arrow-shape",
+            paint: {
+                "fill-color": "#ff0000",
+                "fill-opacity": 0.7
+            }
+        });
+    }
+
+function computeSidesWGS84(points, offsetDistanceMeters = 1000) {
+    const leftSidePoints = [];
+    const rightSidePoints = [];
+
+
+    for (let i = 1; i < points.length; i++) {
+        const prev = points[i - 1];
+        const curr = points[i];
+
+        const bearing = turf.bearing(turf.point(prev), turf.point(curr));
+        const leftBearing = bearing - 90;
+        const rightBearing = bearing + 90;
+
+        const leftPoint = turf.destination(turf.point(curr), offsetDistanceMeters, leftBearing, { units: 'meters' });
+        const rightPoint = turf.destination(turf.point(curr), offsetDistanceMeters, rightBearing, { units: 'meters' });
+
+        leftSidePoints.push(leftPoint.geometry.coordinates);
+        rightSidePoints.push(rightPoint.geometry.coordinates);
+    }
+
+    // První bod
+    const first = points[0];
+    const second = points[1];
+    const initialBearing = turf.bearing(turf.point(first), turf.point(second));
+    const leftInitial = turf.destination(turf.point(first), offsetDistanceMeters, initialBearing - 90, { units: 'meters' });
+    const rightInitial = turf.destination(turf.point(first), offsetDistanceMeters, initialBearing + 90, { units: 'meters' });
+
+    leftSidePoints.unshift(leftInitial.geometry.coordinates);
+    rightSidePoints.unshift(rightInitial.geometry.coordinates);
+
+        console.log("Aktuální bod:", leftSidePoints);
+        console.log("Aktuální bod:", rightSidePoints);
+    return {
+        leftSidePoints,
+        rightSidePoints
+    };
+}
+
+function drawSideLines(map, sides, prefix = "arrow-side") {
+    map.addSource(`${prefix}-left`, {
+        type: "geojson",
+        data: turf.lineString(sides.leftSidePoints)
+    });
+
+    map.addLayer({
+        id: `${prefix}-left`,
+        type: "line",
+        source: `${prefix}-left`,
+        paint: {
+            "line-color": "blue",
+            "line-width": 2
+        }
+    });
+
+    map.addSource(`${prefix}-right`, {
+        type: "geojson",
+        data: turf.lineString(sides.rightSidePoints)
+    });
+
+    map.addLayer({
+        id: `${prefix}-right`,
+        type: "line",
+        source: `${prefix}-right`,
+        paint: {
+            "line-color": "green",
+            "line-width": 2
+        }
+    });
+}
+
+function drawSmoothLineThroughPoints(map, points, lineId = "smooth-line") {
+        const smoothPoints = interpolatePointsCatmullRom(points, 20);
+        const line = turf.lineString(smoothPoints);
+
+        map.addSource(lineId, {
+            type: "geojson",
+            data: line
+        });
+
+        map.addLayer({
+            id: lineId,
+            type: "line",
+            source: lineId,
+            paint: {
+                "line-color": "red",
+                "line-width": 3
+            }
+        });
+
+        // Boční linie
+        const sides = computeSidesWGS84(smoothPoints, 10000); // 10 km offset
+        drawSideLines(map, sides, lineId + "-sides");
+
+        // Šipka na konci
+        const lastPoint = smoothPoints[smoothPoints.length - 1];
+        const secondLastPoint = smoothPoints[smoothPoints.length - 2];
+        const bearing = turf.bearing(turf.point(secondLastPoint), turf.point(lastPoint));
+
+        const triangle = createIsoscelesTriangle(turf.point(lastPoint), 60000, 80000, bearing); // 20km základna, 30km výška
+
+        map.addSource(lineId + "-arrow", {
+            type: "geojson",
+            data: triangle
+        });
+
+        map.addLayer({
+            id: lineId + "-arrow",
+            type: "fill",
+            source: lineId + "-arrow",
+            paint: {
+                "fill-color": "#ff0000",
+                "fill-opacity": 0.7
+            }
+        });
+    }
+
+map.on('load', () => {
+
+const points = [
+        [14.42076, 50.08804], // Praha
+        [15.0, 50.0],
+        [16.3725, 48.2082],   // Vídeň
+        [17.0, 49.0],
+        [13.4050, 52.52]      // Berlín
+    ];
+
+
+
+
+ function createIsoscelesTriangle(center, baseLengthMeters, heightMeters, bearing = 0) {
+        const halfBase = baseLengthMeters / 2;
+
+        const leftBase = turf.destination(center, halfBase, bearing - 90, { units: 'meters' });
+        const rightBase = turf.destination(center, halfBase, bearing + 90, { units: 'meters' });
+        const apex = turf.destination(center, heightMeters, bearing, { units: 'meters' });
+
+        return turf.polygon([[
+            leftBase.geometry.coordinates,
+            rightBase.geometry.coordinates,
+            apex.geometry.coordinates,
+            leftBase.geometry.coordinates
+        ]]);
+    }
+
+
+
+
+    
+    const center = turf.point([52.95, 69.95]); // výchozí střed základny
+
+    // Vytvoř polygon trojúhelníku
+    const triangle = createIsoscelesTriangle(center, 40000, 100000, 10); // 2 km základna, 1 km výška, směr 0° (na sever)
+
+    map.addSource("triangle", {
+        type: "geojson",
+        data: triangle
+    });
+
+    map.addLayer({
+        id: "triangle",
+        type: "fill",
+        source: "triangle",
+        paint: {
+            "fill-color": "purple",
+            "fill-opacity": 0.5
+        }
+    });
+
+    map.addLayer({
+        id: "triangle-outline",
+        type: "line",
+        source: "triangle",
+        paint: {
+            "line-color": "#000",
+            "line-width": 2
+        }
+    });
+
+    map.addSource("latLonGrid", {
+    type: "geojson",
+    data: latLonGrid
+});
+
+map.addLayer({
+    id: "latLonGrid",
+    type: "line",
+    source: "latLonGrid",
+    layout: {},
+    paint: {
+        "line-color": "#888",
+        "line-width": 1,
+        "line-opacity": 0.5
+    }
+});
+
+    // Generuj GeoJSON pro kruh
+    const circleGeoJSON = getCirclePolygon([20, 80], 120, 20);
+    const circle = turf.circle([20, 80], 120000, { units: "meters", steps: 64 });
+    const rectangleGeoJSON = getRectanglePolygon([20, 80], 2200, 2200);
+    const fsdafds = toTurfPolygon(points);
+    const arrowBGeoJSON = toTurfPolygon(arrowPolygonB);
+    const arrowCGeoJSON = toTurfPolygon(arrowPolygonC);
+    const arrowAGeoJSON = toTurfPolygon(arrowPolygonA);
+    
+    //console.log(JSON.stringify(arrowAGeoJSON, null, 2));
+    // Arrow
+    // Přidání GeoJSON jako zdroj
+   map.addSource("arrowPolygonA", {
+        type: "geojson",
+        data: arrowAGeoJSON
+    });
+
+    // Vrstva pro výplň polygonu
+    map.addLayer({
+        id: "arrowPolygonA",
+        type: "fill",
+        source: "arrowPolygonA",
+        layout: {},
+        paint: {
+            "fill-color": "pink",
+            "fill-opacity": 0.6
+        }
+    });
+
+    // Vrstva pro obrys polygonu
+    map.addLayer({
+        id: "arrowPolygonA-outline",
+        type: "line",
+        source: "arrowPolygonA",
+        paint: {
+            "line-color": "#000",
+            "line-width": 3
+        }
+    });
+
+     // Arrow
+    // Přidání GeoJSON jako zdroj
+   map.addSource("arrowPolygonB", {
+        type: "geojson",
+        data: arrowBGeoJSON
+    });
+
+    // Vrstva pro výplň polygonu
+    map.addLayer({
+        id: "arrowPolygonB",
+        type: "fill",
+        source: "arrowPolygonB",
+        layout: {},
+        paint: {
+            "fill-color": "yellow",
+            "fill-opacity": 0.6
+        }
+    });
+
+    // Vrstva pro obrys polygonu
+    map.addLayer({
+        id: "arrowPolygonB-outline",
+        type: "line",
+        source: "arrowPolygonB",
+        paint: {
+            "line-color": "#000",
+            "line-width": 3
+        }
+    });
+
+     // Arrow
+    // Přidání GeoJSON jako zdroj
+   map.addSource("arrowPolygonC", {
+        type: "geojson",
+        data: arrowCGeoJSON
+    });
+
+    // Vrstva pro výplň polygonu
+    map.addLayer({
+        id: "arrowPolygonC",
+        type: "fill",
+        source: "arrowPolygonC",
+        layout: {},
+        paint: {
+            "fill-color": "yellow",
+            "fill-opacity": 0.6
+        }
+    });
+
+    // Vrstva pro obrys polygonu
+    map.addLayer({
+        id: "arrowPolygonC-outline",
+        type: "line",
+        source: "arrowPolygonC",
+        paint: {
+            "line-color": "#000",
+            "line-width": 3
+        }
+    });
+
+    // CIRCLE
+    // Přidání GeoJSON jako zdroj
+    map.addSource("circlePolygon", {
+        "type": "geojson",
+        "data": circleGeoJSON
+    });
+
+    // Přidání vrstvy pro vykreslení polygonu
+    map.addLayer({
+        "id": "circlePolygon",
+        "type": "fill",
+        "source": "circlePolygon",
+        "layout": {},
+        "paint": {
+            "fill-color": "blue",
+            "fill-opacity": 0.6
+        }
+    });
+
+    // Přidání outline pro polygon
+    map.addLayer({
+        "id": "circlePolygon-outline",
+        "type": "line",
+        "source": "circlePolygon",
+        "paint": {
+            "line-color": "#000",
+            "line-width": 3
+        }
+    });
+
+    // RECTANGLE
+     map.addSource("rectanglePolygon", {
+        "type": "geojson",
+        "data": rectangleGeoJSON
+    });
+
+    // Přidání vrstvy pro vykreslení polygonu
+    map.addLayer({
+        "id": "rectanglePolygon",
+        "type": "fill",
+        "source": "rectanglePolygon",
+        "layout": {},
+        "paint": {
+            "fill-color": "red",
+            "fill-opacity": 0.6
+        }
+    });
+
+    // Přidání outline pro polygon
+    map.addLayer({
+        "id": "rectanglePolygon-outline",
+        "type": "line",
+        "source": "rectanglePolygon",
+        "paint": {
+            "line-color": "#000",
+            "line-width": 3
+        }
+    });
+});
+
+
+
+function generateLatLonGrid(step = 10) {
+    const features = [];
+
+    // Rovnoběžky (latitudes)
+    for (let lat = -80; lat <= 80; lat += step) {
+        features.push({
+            type: "Feature",
+            geometry: {
+                type: "LineString",
+                coordinates: Array.from({ length: 37 }, (_, i) => [-180 + i * 10, lat])
+            },
+            properties: {
+                type: "latitude",
+                value: lat
+            }
+        });
+    }
+
+    // Poledníky (longitudes)
+    for (let lon = -180; lon <= 180; lon += step) {
+        features.push({
+            type: "Feature",
+            geometry: {
+                type: "LineString",
+                coordinates: Array.from({ length: 17 }, (_, i) => [lon, -80 + i * 10])
+            },
+            properties: {
+                type: "longitude",
+                value: lon
+            }
+        });
+    }
+
+    return {
+        type: "FeatureCollection",
+        features
+    };
+}

MapArrow.js

@@ -0,0 +1,205 @@
+mapboxgl.accessToken = 'pk.eyJ1Ijoib3V0ZG9vcm1hcHBpbmdjb21wYW55IiwiYSI6ImNqYmh3cDdjYzNsMnozNGxsYzlvMmk2bTYifQ.QqcZ4LVoLWnXafXdjZxnZg';
+    const map = new mapboxgl.Map({
+        container: 'map',
+        center: [10, 50],
+        zoom: 5
+    });
+
+import * as turf from "@turf/turf";
+import { ARROW_BODY_STYLE_CONSTANT, ARROW_BODY_STYLE_LINEAR, ARROW_BODY_STYLE_EXPONENTIAL } from "./Arrow.js";
+
+map.on('load', () => {
+    const points = [
+        [1.42076, 40.08804],
+        [358.4050, 50.52]
+    ];
+
+    const fullPolygon = getArrowPolygon(points, 20000); // offset 20 km
+    map.addSource("arrow-shape", { type: "geojson", data: fullPolygon });
+    map.addLayer({
+        id: "arrow-shape",
+        type: "fill",
+        source: "arrow-shape",
+        paint: {
+            "fill-color": "#ff0000",
+            "fill-opacity": 0.7
+        }
+    });
+
+    const grid = generateLatLonGrid(10);
+    map.addSource("latLonGrid", { type: "geojson", data: grid });
+    map.addLayer({
+        id: "latLonGrid",
+        type: "line",
+        source: "latLonGrid",
+        paint: {
+            "line-color": "#888",
+            "line-width": 1,
+            "line-opacity": 0.5
+        }
+    });
+    
+    // Obrys (černý)
+    map.addLayer({
+        id: "arrow-outline",
+        type: "line",
+        source: "arrow-shape",
+        paint: {
+            "line-color": "#000000",
+            "line-width": 2,
+            "line-opacity": 1
+        }
+    });
+});
+
+const points = [
+    { x: 70, y: 38 },
+    { x: 71, y: 45},
+    { x: 65, y: 50 },
+    { x: 70, y: 53}
+];
+
+const arrowData = {
+    points: points,
+    splineStep: 0.01,
+    spacing: 0.01,
+    offsetDistance: 10000
+  };
+  const style = {
+    calculation: ARROW_BODY_STYLE_LINEAR,
+    range: 1,
+    minValue: 0.1
+  };
+  const arrowHeadData = {
+    widthArrow: 1,
+    lengthArrow: 1
+  };
+
+// Cubic interpolation source from https://www.paulinternet.nl/?page=bicubic
+function cubicInterpolate(p, x) {
+    return p[1] + 0.5 * x * (p[2] - p[0] + x * (2.0 * p[0] - 5.0 * p[1] + 4.0 * p[2] - p[3] + x * (3.0 * (p[1] - p[2]) + p[3] - p[0])));
+}
+
+/**
+ * @param {Object} arrowData - Object with data for arrow
+ * @param {{x: number, y: number}[]} arrowData.points - List of points defining the arrow's path.
+ * @param {number} arrowData.splineStep - The step size for the spline interpolation.
+ * @param {number} arrowData.spacing - The spacing between the points along the arrow.
+ * @param {number} arrowData.offsetDistance - The offset distance for the arrow's path (width).
+ * 
+ * @param {Object} style - Object with data for the calculation style.
+ * @param {number} style.calculation - The style for the calculation
+ * @param {number} style.range - The range for the calculation style.
+ * @param {number} style.minValue - The minimum value used in the calculation.
+ * 
+ * @param {Object|undefined} arrowHeadData - Optional data for the arrowhead.
+ * @param {number} arrowHeadData.widthArrow - The width of the arrowhead.
+ * @param {number} arrowHeadData.lengthArrow - The length of the arrowhead.
+ * 
+ * @returns {{x: number, y: number}[]} - An array of points representing the arrow polygon.
+ */
+export function getArrowPolygon(arrowData, style= undefined, arrowHeadData = undefined) {
+    const splineStep = 20;
+    const smooth = computeSplinePoints(arrowData.points, splineStep);
+    const { leftSidePoints, rightSidePoints } = computeSideOffsets(smooth, arrowData.offsetDistance);
+
+    const end = smooth[smooth.length -1];
+    const bearing = averageBearing(smooth, 3);
+    const triangle = createIsoscelesTriangleCoords(turf.point(end), arrowData.offsetDistance * 5, arrowData.offsetDistance * 5, bearing);
+
+    const polygonCoords = [
+        ...leftSidePoints,
+        ...triangle,
+        ...rightSidePoints.reverse(),
+        leftSidePoints[0]
+    ];
+
+    return turf.polygon([[...polygonCoords]]);
+}
+
+function averageBearing(points, count = 3) {
+    const bearings = [];
+    for (let i = points.length - count; i < points.length -1; i++) {
+        if (i >= 0) {
+            const b = turf.bearing(turf.point(points[i]), turf.point(points[i + 1]));
+            bearings.push(b);
+        }
+    }
+    // Průměr s korekcí kruhového rozsahu
+    const sinSum = bearings.reduce((sum, b) => sum + Math.sin(b * Math.PI / 180), 0);
+    const cosSum = bearings.reduce((sum, b) => sum + Math.cos(b * Math.PI / 180), 0);
+    return Math.atan2(sinSum, cosSum) * 180 / Math.PI;
+}
+
+function computeSplinePoints(points, segments = 10) {
+    if (points.length < 2) return points;
+    const result = [];
+
+    for (let i = 0; i < points.length - 1; i++) {
+        const p0 = points[i === 0 ? i : i - 1];
+        const p1 = points[i];
+        const p2 = points[i + 1];
+        const p3 = points[i + 2] || p2;
+        for (let j = 0; j < segments; j++) {
+            const t = j / segments;
+           const lon = cubicInterpolate([p0[0], p1[0], p2[0], p3[0]], t);
+            const lat = cubicInterpolate([p0[1], p1[1], p2[1], p3[1]], t);
+            result.push([lon, lat]);
+        }
+    }
+
+    result.push(points[points.length - 1]);
+    return result;
+}
+
+function computeSideOffsets(points, offsetMeters) {
+    let leftSidePoints = [];
+    let rightSidePoints = [];
+
+    for (let i = 1; i < points.length; i++) {
+        const previousPoint = points[i - 1];
+        const currentPoint = points[i];
+        const bearing = turf.bearing(turf.point(previousPoint), turf.point(currentPoint));
+        leftSidePoints.push(turf.destination(turf.point(currentPoint), offsetMeters, bearing - 90, { units: 'meters' }).geometry.coordinates);
+        rightSidePoints.push(turf.destination(turf.point(currentPoint), offsetMeters, bearing + 90, { units: 'meters' }).geometry.coordinates);
+    }
+
+    return { leftSidePoints, rightSidePoints };
+}
+
+function createIsoscelesTriangleCoords(center, baseLengthMeters, heightMeters, bearing = 0) {
+    const halfBase = baseLengthMeters / 2;
+    const left = turf.destination(center, halfBase, bearing - 90, { units: 'meters' }).geometry.coordinates;
+    const right = turf.destination(center, halfBase, bearing + 90, { units: 'meters' }).geometry.coordinates;
+    const tip = turf.destination(center, heightMeters, bearing, { units: 'meters' }).geometry.coordinates;
+    return [left, tip, right];
+}
+
+function generateLatLonGrid(step = 10) {
+    const features = [];
+
+    for (let lat = -80; lat <= 80; lat += step) {
+        features.push({
+            type: "Feature",
+            geometry: {
+                type: "LineString",
+                coordinates: Array.from({ length: 37 }, (_, i) => [-180 + i * 10, lat])
+            }
+        });
+    }
+
+    for (let lon = -180; lon <= 180; lon += step) {
+        features.push({
+            type: "Feature",
+            geometry: {
+                type: "LineString",
+                coordinates: Array.from({ length: 17 }, (_, i) => [lon, -80 + i * 10])
+            }
+        });
+    }
+
+    return {
+        type: "FeatureCollection",
+        features
+    };
+}

Polygon.js

@@ -0,0 +1,79 @@
+import * as turf from "@turf/turf";
+
+/**
+ * Converts an array of canvas-compatible points into a Turf.js Polygon.
+ *
+ * @param {{x: number, y: number}[]} points - Array of points with x and y properties.
+ *
+ * @returns {import('@turf/turf').Feature<import('@turf/turf').Polygon> | null} A Turf.js Polygon feature, or null if input is invalid.
+ */
+export function toTurfPolygon(points) {
+    if (!points || points.length < 3) {
+        console.error("Invalid input for polygon:", points);
+        return null;
+    }
+
+    const coords = points.map(p => [p.y, p.x]);
+    coords.push(coords[0]);
+    return turf.polygon([coords]);
+}
+
+/**
+ * Merges two polygons (in canvas format) into a single Turf.js polygon using turf.union.
+ *
+ * @param {{x: number, y: number}[]} polygonA - First polygon (array of points).
+ * @param {{x: number, y: number}[]} polygonB - Second polygon (array of points).
+ *
+ * @returns {import('@turf/turf').Feature<import('@turf/turf').Polygon> | null} A merged Turf.js polygon, or null on failure.
+ */
+export function mergeTurfPolygons(polygonA, polygonB) {
+    const turfPolygonA = toTurfPolygon(polygonA);
+    const turfPolygonB = toTurfPolygon(polygonB);
+
+    return turf.union(turf.featureCollection([turfPolygonA, turfPolygonB]));
+}
+
+/**
+ * Adds a new polygon to an existing merged Turf.js polygon.
+ *
+ * @param {import('@turf/turf').Feature<import('@turf/turf').Polygon>} polygonA - Existing merged Turf.js polygon.
+ * @param {{x: number, y: number}[]} polygonB - New polygon in canvas point format to add to the merge.
+ *
+ * @returns {import('@turf/turf').Feature<import('@turf/turf').Polygon>} Updated merged Turf.js polygon.
+ */
+export function addTurfPolygonToMerge(polygonA, polygonB) {
+    const testB = toTurfPolygon(polygonB);
+    return turf.union(turf.featureCollection([polygonA, testB]));
+}
+
+/**
+ * @param {{x: number, y: number}[][]} polygons
+ * @returns {Feature<Polygon | MultiPolygon, GeoJsonProperties>}
+ */
+
+export function mergePolygons(polygons) {
+
+    if (!polygons || polygons.length === 0)
+        return undefined;
+
+    if (polygons.length === 1)
+        return toTurfPolygon(polygons[0]);
+
+    return turf.union(turf.featureCollection(polygons.map(p => toTurfPolygon(p))));
+}
+
+/**
+ *
+ * @param {Array<Feature<Polygon | MultiPolygon, GeoJsonProperties>>|undefined} features
+ * @returns {Feature<Polygon | MultiPolygon, GeoJsonProperties>|undefined|*}
+ */
+export function mergePolygonFeatures(features) {
+
+    if (!features || features.length === 0)
+        return undefined;
+
+    if (features.length === 1)
+        return features[0];
+
+    return turf.union(turf.featureCollection(features));
+}

PolygonVisuals.js

@@ -0,0 +1,45 @@
+// Converts a Turf polygon into an array of canvas-compatible points
+function toCanvasPolygon(turfPolygon) {
+    if (!turfPolygon || !turfPolygon.geometry) return [];
+
+    let polygons = [];
+
+    if (turfPolygon.geometry.type === 'Polygon') {
+        polygons.push(turfPolygon.geometry.coordinates[0]);
+    } 
+    else if (turfPolygon.geometry.type === 'MultiPolygon') {
+        turfPolygon.geometry.coordinates.forEach(polygon => {
+            polygons.push(polygon[0]);
+        });
+    } 
+    else {
+        console.error("Unsupported geometry type:", turfPolygon.geometry.type);
+        return [];
+    }
+
+    return polygons.map(coords =>
+        coords.slice(0, -1).map(coord => ({ x: coord[0], y: coord[1] }))
+    );
+}
+
+// Draws a polygon on the canvas with a given color
+export function drawPolygon(turfPolygon, color, canvas) {
+    const ctx = canvas.getContext("2d");
+    ctx.fillStyle = color;
+
+    const polygons = toCanvasPolygon(turfPolygon);
+    if (!polygons.length) {
+        console.log("No valid polygons to draw.");
+        return;
+    }
+
+    polygons.forEach(points => {
+        if (points.length < 3) return;
+
+        ctx.beginPath();
+        ctx.moveTo(points[0].x, points[0].y);
+        points.forEach(p => ctx.lineTo(p.x, p.y));
+        ctx.closePath();
+        ctx.fill();
+    });
+}

index.html

@@ -1,14 +1,19 @@
-<!doctype html>
+<!DOCTYPE html>
-<html lang="en">
+<html>
 <head>
-    <meta charset="UTF-8" />
+<meta charset="utf-8">
-    <link rel="icon" type="image/svg+xml" href="/vite.svg" />
+<title>Display a map on a webpage</title>
-    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
-    <title>Vite App</title>
+<link href="https://api.mapbox.com/mapbox-gl-js/v3.12.0/mapbox-gl.css" rel="stylesheet">
+<script src="https://api.mapbox.com/mapbox-gl-js/v3.12.0/mapbox-gl.js"></script>
+<style>
+body { margin: 0; padding: 0; }
+#map { position: absolute; top: 0; bottom: 0; width: 100%; }
+</style>
 </head>
 <body>
-    <div id="app"></div>
+<div id="map"></div>
-    <canvas id="canvas" width="800" height="600"></canvas>
+    <script type="module" src="MapArrow.js"></script>
-    <script type="module" src="ArrowPoints.js"></script>
+
 </body>
 </html>