Merge remote-tracking branch 'upstream/main'

frontend/node_modules/zrender/src/graphic/shape/Trochoid.ts

@@ -0,0 +1,92 @@
+/**
+ * 内外旋轮曲线
+ * @module zrender/graphic/shape/Trochold
+ */
+
+import Path, { PathProps } from '../Path';
+
+const cos = Math.cos;
+const sin = Math.sin;
+
+export class TrochoidShape {
+    cx = 0
+    cy = 0
+    r = 0
+    r0 = 0
+    d = 0
+    location = 'out'
+}
+
+export interface TrochoidProps extends PathProps {
+    shape?: Partial<TrochoidShape>
+}
+class Trochoid extends Path<TrochoidProps> {
+
+    shape: TrochoidShape
+
+    constructor(opts?: TrochoidProps) {
+        super(opts);
+    }
+
+    getDefaultStyle() {
+        return {
+            stroke: '#000',
+            fill: null as string
+        };
+    }
+
+    getDefaultShape() {
+        return new TrochoidShape();
+    }
+
+    buildPath(ctx: CanvasRenderingContext2D, shape: TrochoidShape) {
+        const R = shape.r;
+        const r = shape.r0;
+        const d = shape.d;
+        const offsetX = shape.cx;
+        const offsetY = shape.cy;
+        const delta = shape.location === 'out' ? 1 : -1;
+        let x1;
+        let y1;
+        let x2;
+        let y2;
+
+        if (shape.location && R <= r) {
+            return;
+        }
+
+        let num = 0;
+        let i = 1;
+        let theta;
+
+        x1 = (R + delta * r) * cos(0)
+            - delta * d * cos(0) + offsetX;
+        y1 = (R + delta * r) * sin(0)
+            - d * sin(0) + offsetY;
+
+        ctx.moveTo(x1, y1);
+
+        // 计算结束时的i
+        do {
+            num++;
+        }
+        while ((r * num) % (R + delta * r) !== 0);
+
+        do {
+            theta = Math.PI / 180 * i;
+            x2 = (R + delta * r) * cos(theta)
+                    - delta * d * cos((R / r + delta) * theta)
+                    + offsetX;
+            y2 = (R + delta * r) * sin(theta)
+                    - d * sin((R / r + delta) * theta)
+                    + offsetY;
+            ctx.lineTo(x2, y2);
+            i++;
+        }
+        while (i <= (r * num) / (R + delta * r) * 360);
+
+    }
+}
+
+Trochoid.prototype.type = 'trochoid';
+export default Trochoid;