feat: circle no longer constant

load1n9 · Dec 19, 2021 · abf7631 · abf7631
1 parent 49a52e0
commit abf7631
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Showing 3 changed files with 15 additions and 7 deletions.
diff --git a/examples/Circle.ts b/examples/Circle.ts
@@ -2,7 +2,7 @@ import { World, Scene, Circle } from '../mod.ts';
 
 
 class Game extends Scene {
-    public test = new Circle(100, 100, 200, "#00ff00");
+    public test = new Circle(300, 300, 40, "#00ff00");
 
     public setup() {
         this.addChild(this.test);

diff --git a/src/Renderer.ts b/src/Renderer.ts
@@ -31,6 +31,7 @@ export class Renderer {
       );
       this.world.fillRect(entity.x, entity.y, entity.width, entity.height);
     } else if (entity instanceof Circle) {
+      entity.update();
       this.world.setDrawColor(
         entity.fill[0],
         entity.fill[1],

diff --git a/src/entities/geometry/Circle.ts b/src/entities/geometry/Circle.ts
@@ -6,19 +6,26 @@ export class Circle extends Entity {
   public fill: RGBA;
   public radius: number;
   public points: Array<Point> = [];
+  public prevX = Infinity;
+  public prevY = Infinity;
   constructor(x: number, y: number, radius: number, fill: RGBA | string) {
     super(x, y);
     this.fill = typeof fill === 'string' ? hexToRGBA(fill) : fill;
     this.radius = radius;
-
-    for (let w = 0; w < radius * 2; w++) {
-      for (let h = 0; h < radius * 2; h++) {
-        const dx = radius - w;
-        const dy = radius - h;
-        if ((dx * dx + dy * dy) <= (radius * radius)) {
+  }
+  public update() {
+    if (this.prevX === this.x && this.prevY === this.y) return;
+    this.points = [];
+    for (let w = 0; w < this.radius * 2; w++) {
+      for (let h = 0; h < this.radius * 2; h++) {
+        const dx = this.radius - w;
+        const dy = this.radius - h;
+        if ((dx * dx + dy * dy) <= (this.radius * this.radius)) {
           this.points.push(new Point(this.x + dx, this.y + dy));
         }
       }
     }
+    this.prevX = this.x;
+    this.prevY = this.y;
   }
 }