HTML Canvas Gradients
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HTML Canvas Gradients
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Canvas - Gradients
Gradients can be used to fill rectangles, circles, lines, text, etc. Shapes
on the canvas are not limited to solid colors.
There are two different types of gradients:
- createLinearGradient(x,y,x1,y1) - creates a linear gradient
- createRadialGradient(x,y,r,x1,y1,r1) - creates a radial/circular gradient
Once we have a gradient object, we must add two or more color stops.
The addColorStop() method specifies the color stops, and its position along
the gradient. Gradient positions can be anywhere between 0 to 1.
To use the gradient, set the fillStyle or strokeStyle property to the
gradient, then draw the shape (rectangle, text, or a line).
Using createLinearGradient()
Example
Create a linear gradient. Fill rectangle with the gradient:
Your browser does not support the HTML5 canvas tag.
var c=document.getElementById("myCanvas6");
var canvOK=1;
try {c.getContext("2d");}
catch (er) {canvOK=0;}
if (canvOK==1)
{
var ctx=c.getContext("2d");
var grd=ctx.createLinearGradient(0,0,200,0);
grd.addColorStop(0,"red");
grd.addColorStop(1,"white");
ctx.fillStyle=grd;
ctx.fillRect(10,10,150,80);
}
JavaScript:
var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
// Create gradient
var grd=ctx.createLinearGradient(0,0,200,0);
grd.addColorStop(0,"red");
grd.addColorStop(1,"white");
// Fill with gradient
ctx.fillStyle=grd;
ctx.fillRect(10,10,150,80);Try it Yourself »
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Using createRadialGradient():
Example
Create a radial/circular gradient. Fill rectangle with the gradient:
Your browser does not support the HTML5 canvas tag.
var c=document.getElementById("myCanvas7");
var canvOK=1;
try {c.getContext("2d");}
catch (er) {canvOK=0;}
if (canvOK==1) {
var ctx=c.getContext("2d");
// Create gradient
var grd=ctx.createRadialGradient(75,50,5,90,60,100);
grd.addColorStop(0,"red");
grd.addColorStop(1,"white");
// Fill with gradient
ctx.fillStyle = grd;
ctx.fillRect(10,10,150,80);
}
JavaScript:
var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
// Create gradient
var grd=ctx.createRadialGradient(75,50,5,90,60,100);
grd.addColorStop(0,"red");
grd.addColorStop(1,"white");
// Fill with gradient
ctx.fillStyle = grd;
ctx.fillRect(10,10,150,80);Try it Yourself »
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