Merge branch 'feat/worker-w-seperate-styling' of github.com:reearth/c…

…esium-mvt-imagery-provider into feat/worker-w-seperate-styling

src/util.ts

@@ -0,0 +1,49 @@
+import Point from "@mapbox/point-geometry";
+
+const tempPoint = new Point(0, 0);
+
+export function isPointClicked(feature: Point[][], clicked: Point, radius: number): boolean {
+  if (feature.length === 0 || feature[0].length === 0) return false;
+  const point = feature[0][0];
+  const distSquared = point.distSqr(clicked);
+  return distSquared <= radius ** 2;
+}
+
+export function isLineStringClicked(feature: Point[][], mouse: Point, lineWidth: number): boolean {
+  if (feature.length === 0) return false;
+  const points = feature[0];
+  const dist = lineWidth / 2;
+
+  for (let i = 0; i < points.length - 1; i++) {
+    const start = points[i];
+    const end = points[i + 1];
+    if (isLineSegmentClicked(start, end, mouse, dist, tempPoint)) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+function isLineSegmentClicked(
+  start: Point,
+  end: Point,
+  mouse: Point,
+  dist: number,
+  tempPoint = new Point(0, 0),
+): boolean {
+  const lineLengthSquared = start.distSqr(end);
+  if (lineLengthSquared === 0) return false;
+
+  const t =
+    ((mouse.x - start.x) * (end.x - start.x) + (mouse.y - start.y) * (end.y - start.y)) /
+    lineLengthSquared;
+  const tClamped = Math.max(0, Math.min(1, t));
+
+  const nearest = tempPoint;
+  nearest.x = start.x + tClamped * (end.x - start.x);
+  nearest.y = start.y + tClamped * (end.y - start.y);
+
+  const distanceSquared = mouse.distSqr(nearest);
+  return distanceSquared <= dist ** 2;
+}