User:Lbattich/canvas experiments: Difference between revisions
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Javascript section of the source code: | |||
<code> | <code> | ||
var x=document.getElementById("proun"); //declare global var x for canvas | var x=document.getElementById("proun"); //declare global var x for canvas | ||
| Line 46: | Line 10: | ||
var ctx=x.getContext("2d"); | var ctx=x.getContext("2d"); | ||
window.onload = function(){start();setInterval(function(){choose()},700)}; | window.onload = function(){start();setInterval(function(){choose()},700)}; | ||
function start() | function start() | ||
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return colour; | return colour; | ||
} | } | ||
</code> | </code> | ||
Revision as of 14:39, 23 September 2014
Javascript section of the source code:
var x=document.getElementById("proun"); //declare global var x for canvas
var y1,y2,y3,x1,m1;
//var i=0;
var ctx=x.getContext("2d");
window.onload = function(){start();setInterval(function(){choose()},700)};
function start()
{
x.width=window.innerWidth-30;
x.height=window.innerHeight-30;
ctx.fillStyle=colourme()+"1)"; //first colour
ctx.fillRect(0,0,x.width,x.height);
ctx.fill();
four();
}
//choose btw different shapes
function choose() {
var numb=Math.floor(Math.random()*4);
if (numb==0){four()}
else if (numb==1){four()}
else if (numb==2){four()}
else if (numb==3){four()}
}
//functions:
//create a 4 sided shape:
function four()
{
var x4,y4;
y4=Math.floor((x.height+1)*Math.random());
x4=Math.floor((x.width+1)*Math.random());
ctx.beginPath();
ctx.moveTo(x4,y4);
y4=Math.floor((x.height+1)*Math.random());
x4=Math.floor((x.width+1)*Math.random());
ctx.lineTo(x4,y4);
y4=Math.floor((x.height+1)*Math.random());
x4=Math.floor((x.width+1)*Math.random());
ctx.lineTo(x4,y4);
y4=Math.floor((x.height+1)*Math.random());
x4=Math.floor((x.width+1)*Math.random());
ctx.lineTo(x4,y4);
y4=Math.floor((x.height+1)*Math.random());
x4=Math.floor((x.width+1)*Math.random());
ctx.lineTo(x4,y4);
ctx.closePath();
var grd=ctx.createLinearGradient(x.width/2,y4,x4,x.height);
grd.addColorStop(0,colourme()+"1)");
grd.addColorStop(1,colourme()+"1)");
ctx.fillStyle=grd;
ctx.fill();
}
//pick a random colour
function colourme()
{
var a = Math.floor(256*Math.random());
var b = Math.floor(256*Math.random());
var c = Math.floor(256*Math.random());
var colour = "rgba("+a+","+b+","+c+",";
return colour;
}