Merge remote-tracking branch 'upstream/main'

2026-08-26 09:31:34 +08:00
parent 9b8c4bfab6
commit 394eb0285d
34137 changed files with 3589424 additions and 0 deletions
@@ -0,0 +1,60 @@
+/**
+ * 正多边形
+ */
+
+import Path, { PathProps } from '../Path';
+
+const PI = Math.PI;
+const sin = Math.sin;
+const cos = Math.cos;
+
+export class IsogonShape {
+    x = 0
+    y = 0
+    r = 0
+    n = 0
+}
+
+export interface IsogonProps extends PathProps {
+    shape?: Partial<IsogonShape>
+}
+class Isogon extends Path<IsogonProps> {
+
+    shape: IsogonShape
+
+    constructor(opts?: IsogonProps) {
+        super(opts);
+    }
+
+    getDefaultShape() {
+        return new IsogonShape();
+    }
+
+    buildPath(ctx: CanvasRenderingContext2D, shape: IsogonShape) {
+        const n = shape.n;
+        if (!n || n < 2) {
+            return;
+        }
+
+        const x = shape.x;
+        const y = shape.y;
+        const r = shape.r;
+
+        const dStep = 2 * PI / n;
+        let deg = -PI / 2;
+
+        ctx.moveTo(x + r * cos(deg), y + r * sin(deg));
+        for (let i = 0, end = n - 1; i < end; i++) {
+            deg += dStep;
+            ctx.lineTo(x + r * cos(deg), y + r * sin(deg));
+        }
+
+        ctx.closePath();
+
+        return;
+    }
+}
+
+Isogon.prototype.type = 'isogon';
+
+export default Isogon;