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