1 files changed, 55 insertions, 0 deletions
diff --git a/src/entities/borderParticles.js b/src/entities/borderParticles.js
new file mode 100644
index 0000000..a8d7036
--- /dev/null
+++ b/src/entities/borderParticles.js
@@ -0,0 +1,55 @@
+game.createBorderParticles = ({colors, maxAmount, minAmount, minLife, maxLife, minRadius, maxRadius, maxSpeed}) => {
+  const particles = game.Entity();
+  let particleSpecs = Array(randomInRange(minAmount, maxAmount)).fill(0).map(() => {
+    const particle = {
+      x: Math.random(),
+      y: Math.random(),
+      dx: Math.random() * maxSpeed - maxSpeed / 2,
+      dy: Math.random() * maxSpeed - maxSpeed / 2,
+      radius: randomInRange(minRadius, maxRadius),
+      color: colors[randomInRange(0, colors.length-1)],
+      lifetime: randomInRange(minLife, maxLife),
+      elapsed: 0,
+    };
+    switch (Math.floor(Math.random() * 4)) {
+      case 0:
+        particle.y = 0;
+        particle.dy = -Math.abs(particle.dy);
+        break;
+      case 1:
+        particle.x = 1;
+        particle.dx = Math.abs(particle.dx);
+        break;
+      case 2:
+        particle.y = 1;
+        particle.dy = Math.abs(particle.dy);
+        break;
+      case 3:
+        particle.x = 0;
+        particle.dx = -Math.abs(particle.dx);
+        break;
+    }
+    return particle;
+  });
+  particles.addComponent(game.components.LoadPriority({priority: 1}));
+  particles.addComponent(game.components.Alive());
+  particles.sprite = game.graphics.Sprite({
+    drawFunction: (elapsedTime, {x, y, width, height}, context) => {
+      particleSpecs.map((spec) => spec.elapsed += elapsedTime);
+      particleSpecs = particleSpecs.filter((spec) => spec.lifetime > spec.elapsed);
+      if (particleSpecs.length === 0) {
+        particles.removeComponent("alive");
+      }
+      particleSpecs.map((spec) => {
+        const position = {x: (spec.x * width) + x + spec.dx * spec.elapsed, y: (spec.y * height) + y + spec.dy * spec.elapsed};
+        const fill = context.fillStyle;
+        context.fillStyle = spec.color;
+        context.beginPath();
+        context.arc(position.x, position.y, spec.radius, 0, 2 * Math.PI);
+        context.fill();
+        context.fillStyle = fill;
+      });
+    }
+  })
+  return particles;
+}
+\ No newline at end of file