HTML Canvas Gradients
Canvas - fillStyle Property
The fillStyle property is used to define a fill-color (or gradient) for the drawing.
Example
Define a red fill-color for a rectangle:
JavaScript:
var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
ctx.fillStyle="#FF0000";
ctx.fillRect(20,20,150,100);
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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, and then draw the shape, like a rectangle, text, or a line.
Using createLinearGradient():
Example
Create a linear gradient. Fill rectangle with the gradient:
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);
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Using createRadialGradient():
Example
Create a radial/circular gradient. Fill rectangle with the gradient:
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.arc(50, 50, 50, 0, 2*Math.PI);
ctx.fillStyle = grd;
ctx.fill();
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Color Picker
