一溜烟的博客

缓动公式:

sprite.x += (targetX - sprite.x) * easing;//easing为缓动系数变量

sprite.y += (targetY - sprite.y) * easing;

弹性公式:

vx += (targetX - sprite.x) * spring;//spring为弹性系数

vy += (targetY - sprite.y) * spring;

sprite.x += (vx *= friction);//friction为摩擦力

sprite.y += (vy *= friction); 偏移弹性公式:

var dx:Number = sprite.x - fixedX;

var dy:Number = sprite.y - fixedY;

var angle:Number = Math.atan2(dy, dx);

var targetX:Number = fixedX + Math.cos(angle) * springLength;

var targetY:Number = fixedX + Math.sin(angle) * springLength;

向鼠标旋转(或向某点旋转)

dx = mouseX - sprite.x; dy = mouseY - sprite.y;

sprite.rotation = Math.atan2(dy, dx) * 180 / Math.PI;

波形运动: