代码片段：
this.update = function () {
var lastPoint = { x: _this.x, y: _this.y };
// Move points over time
_this.radians += _this.velocity;
// Drag effect
_this.lastMouse.x += (mouse.x - _this.lastMouse.x) * 0.05;
_this.lastMouse.y += (mouse.y - _this.lastMouse.y) * 0.05;
// Circular Motion
_this.distanceFromCenter.x = _this.prevDistanceFromCenter.x + Math.sin(_this.radians) * 100;
_this.distanceFromCenter.y = _this.prevDistanceFromCenter.x + Math.sin(_this.radians) * 100;
_this.x = _this.lastMouse.x + Math.cos(_this.radians) * _this.distanceFromCenter.x;
_this.y = _this.lastMouse.y + Math.sin(_this.radians) * _this.distanceFromCenter.y;
_this.draw(lastPoint);
};
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