feat: impliment getSelftRect method for Arc

src/shapes/Arc.ts

@@ -4,6 +4,7 @@ import { Konva } from '../Global';
 import { GetSet } from '../types';
 import { getNumberValidator, getBooleanValidator } from '../Validators';
 import { _registerNode } from '../Global';
+import { Transform, Util } from '../Util';
 
 export interface ArcConfig extends ShapeConfig {
   angle: number;
@@ -60,6 +61,32 @@ export class Arc extends Shape<ArcConfig> {
     this.outerRadius(height / 2);
   }
 
+  getSelfRect() {
+    const radius = this.outerRadius()
+    const DEG_TO_RAD = Math.PI / 180;
+    const angle = this.angle() * DEG_TO_RAD;
+    const inc = 1 * DEG_TO_RAD;
+
+    const xs = [];
+    const ys = [];
+    for (let i = 0; i < angle + inc; i += inc ) {
+      xs.push(Math.cos(i));
+      ys.push(Math.sin(i));
+    }
+
+    const minX = Math.round(radius * Math.min(...xs));
+    const maxX = Math.round(radius * Math.max(...xs));
+    const minY = Math.round(radius * Math.min(...ys));
+    const maxY = Math.round(radius * Math.max(...ys));
+
+    return {
+      x: minX || 0,
+      y: minY || 0,
+      width: maxX - minX,
+      height: maxY - minY
+    }
+  }
+
   innerRadius: GetSet<number, this>;
   outerRadius: GetSet<number, this>;
   angle: GetSet<number, this>;