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CANVAS Wave dynamic Background

Source: Internet
Author: User
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Reference: Https://github.com/cyclegtx/wave_background

Do the water background, may be used in the future ha!

The effect is as follows:

The code is as follows:

<!DOCTYPE HTML><HTML><Head>    <title>Wave background</title>    <MetaCharSet= "Utf-8" />    <style>html, Body{width:100%;Height:100%;padding:0;margin:0;}    </style></Head><Body>    <CanvasID= "Canvas"style= "position:absolute;top:0px;left:0px;z-index:1;"></Canvas>    <Scripttype= "Text/javascript">        varCanvas=document.getElementById ('Canvas'); varCTX=Canvas.getcontext ('2d'); Canvas.width=Canvas.parentNode.offsetWidth; Canvas.height=Canvas.parentNode.offsetHeight; //if the browser supports requestanimframe use requestanimframe otherwise use settimeoutWindow.requestanimframe= (function(){          returnWindow.requestanimationframe||Window.webkitrequestanimationframe||Window.mozrequestanimationframe||                  function(callback) {Window.settimeout (callback, + /  -);          };          })(); //Wave size        varBoheight=Canvas.height/ Ten; varPosheight=Canvas.height/ 1.2; //Initial angle of 0        varStep= 0; //defines the color of three different waves        varLines= ["Rgba (0,222,255, 0.2)",                         "Rgba (157,192,249, 0.2)",                         "Rgba (0,168,255, 0.2)"]; functionLoop () {Ctx.clearrect (0,0, Canvas.width,canvas.height); Step++; //draw a rectangle of 3 different colors             for(varJ=Lines.length- 1; J>= 0; J--) {Ctx.fillstyle=Lines[j]; //each rectangle has a different angle, with a 45 degree difference between each                varAngle=(Step+J* -)*Math.PI/180;                 varDeltaheight=Math.sin (angle)*Boheight; varDeltaheightright=Math.Cos (angle)*Boheight;                Ctx.beginpath (); Ctx.moveto (0, Posheight+deltaheight); Ctx.beziercurveto (Canvas.width/2, Posheight+deltaheight-boheight, Canvas.width/ 2, Posheight+Deltaheightright-boheight, Canvas.width, Posheight+deltaheightright);                  Ctx.lineto (Canvas.width, canvas.height); Ctx.lineto (0, Canvas.height); Ctx.lineto (0, Posheight+deltaheight);                  Ctx.closepath ();              Ctx.fill ();        } requestanimframe (loop);     } loop (); </Script></Body></HTML>

CANVAS Wave dynamic Background

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Related Keywords:
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