[英]How to Draw a Circle with Centered Fadeing Out Gradients with HTML5 Canvas?
您想使用ctx.createRadialGradient()
方法。
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
var x = 100,
y = 75,
// Radii of the white glow.
innerRadius = 5,
outerRadius = 70,
// Radius of the entire circle.
radius = 60;
var gradient = ctx.createRadialGradient(x, y, innerRadius, x, y, outerRadius);
gradient.addColorStop(0, 'white');
gradient.addColorStop(1, 'blue');
ctx.arc(x, y, radius, 0, 2 * Math.PI);
ctx.fillStyle = gradient;
ctx.fill();
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