html5 canvas underwater waterweed animation
html5 canvas underwater waterweed animation
代码片段：
Stem.prototype.draw = function(ctx) {
var len, ctrlPoint, point;
len = this.points.length - 1;
ctrlPoint = {x: 0, y: 0};
ctx.save();
ctx.strokeStyle = this.color;
ctx.beginPath();
ctx.moveTo(this.points[this.points.length - 1].x, this.points[this.points.length - 1].y);
for (var i = len; i >= 1; i--) {
point = this.points[i];
ctrlPoint.x = (point.x + this.points[i - 1].x) / 2;
ctrlPoint.y = (point.y + this.points[i - 1].y) / 2;
ctx.quadraticCurveTo(point.x, point.y, ctrlPoint.x, ctrlPoint.y);
ctx.lineWidth = i * 1.1;
ctx.stroke();
ctx.fillStyle = 'red';
}
ctx.restore();
}
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