58 lines
986 B
JavaScript
58 lines
986 B
JavaScript
function Scratch(){
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var self = this;
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self.canvas = $("#scratch");
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self.ctx = self.canvas.getContext("2d");
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// 711 x 400
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var w = 711;
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var h = 400;
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self.scratchIn = function(){
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// SOUND!
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SOUNDS.scratch_in.play();
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// anim
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self.startUpdateLoop(false, function(){
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self.canvas.style.display = "none";
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});
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};
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self.scratchOut = function(){
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// SOUND!
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SOUNDS.scratch_in.play();
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// anim
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self.canvas.style.display = "block";
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self.startUpdateLoop(true);
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};
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self.startUpdateLoop = function(out, callback){
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var frame = 0;
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var xOffset = out ? 0 : w;
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var handle = subscribe("update", function(){
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var yOffset = Math.floor(frame)*h;
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// Redraw canvas
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self.ctx.clearRect(0, 0, self.canvas.width, self.canvas.height);
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self.ctx.drawImage(
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IMAGES.scratch,
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xOffset, yOffset, w, h,
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0, 0, w, h);
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// Staaaahhhhhp
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if(frame>19){
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unsubscribe(handle);
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if(callback) callback();
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return;
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}
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frame+=0.5;
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});
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};
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} |