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a guest on May 15th, 2012 - this.x in setValues is a number. In update it's NaN
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title> test </title> | |
| </head> | |
| <body> | |
| <canvas id="myCanvas" width="512" height="512" style="border:1px solid #c3c3c3;">Your browser is bad and you should feel bad (no canvas support)</canvas> | |
| <br> testing | |
| <script type="text/javascript"> | |
| var c = document.getElementById("myCanvas"); | |
| var ctx = c.getContext("2d"); | |
| var WIDTH=c.width, HEIGHT=c.height; | |
| function init(){ | |
| } | |
| function clear() { | |
| ctx.clearRect(0, 0, WIDTH, HEIGHT); | |
| } | |
| function particle() { | |
| this.x = 0; | |
| this.y = 0; | |
| this.vx = 0; | |
| this.vy = 0; | |
| this.radius = 10; | |
| this.color = "#0000FF"; | |
| this.currentTime = 0; | |
| this.maxTime = 0; | |
| this.alive = true; | |
| this.setValues = function(x,y,vx,vy,r,color,life){ | |
| alert(this.x); | |
| this.x = x; | |
| this.y = y; | |
| this.vx = vx; | |
| this.vy = vy; | |
| this.radius = r; | |
| this.color = color; | |
| this.maxTime = life; | |
| //alert(this.x); | |
| } | |
| this.draw = function() { | |
| clear(); | |
| if(this.alive == true){ | |
| ctx.beginPath(); | |
| ctx.arc(this.x, this.y, this.radius, 0, Math.PI*2, true); | |
| ctx.closePath(); | |
| ctx.fillStyle="#FF0000"; | |
| ctx.fill(); | |
| //alert(this.x); | |
| } | |
| } | |
| this.update = function() { | |
| if(this.alive == true){ | |
| alert(this.x); | |
| this.x = this.x + this.vx; | |
| this.y = this.y + this.vy; | |
| this.currentTime += 1; | |
| if(this.maxTime!=0){ | |
| if(this.currentTime>=this.maxTime) { | |
| this.alive = false; | |
| } | |
| } | |
| } | |
| this.draw(); | |
| } | |
| } | |
| var particles = []; | |
| function initParticles(){ | |
| for(var i=0; i<10; i++){ | |
| particles.push(new particle()); | |
| particles[i].setValues(Math.random()*50,Math.random()*50,Math.random*10,Math.random()*10,"#0000FF",0); | |
| } | |
| } | |
| function updateParticles() { | |
| for(var i=0; i<10; i++){ | |
| particles[i].update(); | |
| } | |
| } | |
| initParticles(); | |
| intervalId=setInterval("updateParticles()",1000/30); | |
| //updateParticles(); | |
| </script> | |
| </body> | |
| </html> |
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