Merge pull request #196 from VisActor/feat/compute-quadrant

Feat/compute quadrant

common/changes/@visactor/vutils/feat-compute-quadrant_2024-08-01-03-04.json

@@ -0,0 +1,10 @@
+{
+  "changes": [
+    {
+      "packageName": "@visactor/vutils",
+      "comment": "feat: add function `computeQuadrant`",
+      "type": "none"
+    }
+  ],
+  "packageName": "@visactor/vutils"
+}

packages/vutils/__tests__/angle.test.ts

@@ -1,4 +1,4 @@
-import { findBoundaryAngles, normalizeAngle, polarToCartesian, calculateMaxRadius } from '../src';
+import { findBoundaryAngles, normalizeAngle, polarToCartesian, calculateMaxRadius, computeQuadrant } from '../src';
 
 describe('angle utils', () => {
   it('normalizeAngle', () => {
@@ -41,4 +41,17 @@ describe('angle utils', () => {
       calculateMaxRadius({ width: 400, height: 500 }, { x: 200, y: 350 }, -0.8 * Math.PI, 0.1 * Math.PI)
     ).toBeCloseTo(157.71933363574007);
   });
+
+  it('computeQuadrant', () => {
+    expect(computeQuadrant(-0.5)).toBe(1);
+    expect(computeQuadrant(-1)).toBe(1);
+    expect(computeQuadrant(-2)).toBe(4);
+    expect(computeQuadrant(-3)).toBe(4);
+    expect(computeQuadrant(-4)).toBe(3);
+    expect(computeQuadrant(0.5)).toBe(2);
+    expect(computeQuadrant(1)).toBe(2);
+    expect(computeQuadrant(2)).toBe(3);
+    expect(computeQuadrant(3)).toBe(3);
+    expect(computeQuadrant(4)).toBe(4);
+  });
 });

packages/vutils/src/angle.ts

@@ -181,3 +181,17 @@ export function calculateMaxRadius(
 
   return Math.min.apply(null, radiusList);
 }
+
+export type Quadrant = 1 | 2 | 3 | 4;
+
+export function computeQuadrant(angle: number): Quadrant {
+  angle = normalizeAngle(angle);
+  if (angle > 0 && angle <= Math.PI / 2) {
+    return 2;
+  } else if (angle > Math.PI / 2 && angle <= Math.PI) {
+    return 3;
+  } else if (angle > Math.PI && angle <= (3 * Math.PI) / 2) {
+    return 4;
+  }
+  return 1;
+}