bunnymark

examples/bunnymark/config.js

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+return {
+  title:"Bunnymark",
+  width:1200,
+  height:600,
+}

examples/bunnymark/main.js

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+var draw = use('draw2d')
+var render = use('render')
+var graphics = use('graphics')
+var sprite = use('sprite')
+var geom = use('geometry')
+var input = use('controller')
+var config = use('config')
+
+var bunnyTex = graphics.texture("bunny")
+
+// We'll store our bunnies in an array of objects: { x, y, vx, vy }
+var bunnies = []
+
+// Start with some initial bunnies:
+for (var i = 0; i < 100; i++) {
+  bunnies.push({
+    x: Math.random() * config.width,
+    y: Math.random() * config.height,
+    vx: (Math.random() * 300) - 150,
+    vy: (Math.random() * 300) - 150
+  })
+}
+
+var fpsSamples = []
+var fpsAvg = 0
+
+this.update = function(dt) {
+  // Compute FPS average over the last 60 frames:
+  var currentFPS = 1 / dt
+  fpsSamples.push(currentFPS)
+  if (fpsSamples.length > 60) fpsSamples.shift()
+  var sum = 0
+  for (var f of fpsSamples) sum += f
+  fpsAvg = sum / fpsSamples.length
+
+  // If left mouse is down, spawn some more bunnies:
+  var mouse = input.mousestate()
+  if (mouse.left)
+    for (var i = 0; i < 50; i++) {
+      bunnies.push({
+        x: mouse.x,
+        y: mouse.y,
+        vx: (Math.random() * 300) - 150,
+        vy: (Math.random() * 300) - 150
+      })
+    }
+
+  // Update bunny positions and bounce them inside the screen:
+  for (var i = 0; i < bunnies.length; i++) {
+    var b = bunnies[i]
+    b.x += b.vx * dt
+    b.y += b.vy * dt
+
+    // Bounce off left/right edges
+    if (b.x < 0) { b.x = 0; b.vx = -b.vx }
+    else if (b.x > config.width) { b.x = config.width; b.vx = -b.vx }
+
+    // Bounce off bottom/top edges
+    if (b.y < 0) { b.y = 0; b.vy = -b.vy }
+    else if (b.y > config.height) { b.y = config.height; b.vy = -b.vy }
+  }
+}
+
+this.hud = function() {
+  draw.images(bunnyTex, bunnies)
+
+  var msg = 'FPS: ' + fpsAvg.toFixed(2) + '   Bunnies: ' + bunnies.length
+  draw.text(msg, {x:0, y:0, width:config.width, height:40}, undefined, 0, Color.white, 0)
+}