JavaScript canvas2d object method: createRadialGradient()
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The createRadialGradient() method of the JavaScript
DOM object returned
by the getContext("2d")
method applied to the HTML <canvas>
element creates a radial (i.e. circular) gradient. The resulting object can be
used as the value of the strokeStyle
or fillStyle
properties and hence to fill in rectangles, circles etc. You
need to apply some addColorStop()
methods to the gradient for it to be visible.
It has the following
syntax with the following parameters.
context.createRadialGradient(xstart, ystart,
rstart, xend, yend, rend)
|
Parameter
|
Required / Optional
|
Description
|
|
xstart
|
Required
|
x-coordinate of centre
of starting circle of gradient
|
|
xend
|
Required
|
y-coordinate of centre
of starting circle of gradient
|
|
rstart
|
Required
|
Radius of starting circle
|
|
ystart
|
Required
|
x-coordinate of centre
of ending circle of gradient
|
|
yend
|
Required
|
y-coordinate of centre
of ending circle of gradient
|
|
rend
|
Required
|
Radius of ending circle
|
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