数学、物理算法ActionScript实现(2)
1.简单的缓动
A:
sprite.vx=(targetX-sprite.x)*easing;
sprite.vy=(targetY-sprite.y)*easing;
sprite.x+=sprite.vx;
sprite.y+=sprite.vy;
B:
var dx:Number=targetX-sprite.x;
var dy:Number=targetY-sprite.y;
sprite.vx=dx*easing;
sprite.vy=dy*easing;
sprite.x+=sprite.vx;
sprite.y+=sprite.vy;
C:
sprite.x+=(targetX-sprite.x)*easing;
sprite.y+=(targetY-sprite.y)*easing;
2.简单的弹性
A:
var ax:Number=(targetX-sprite.x)*spring;
var ay:Number=(targetY-sprite.y)*spring;
sprite.vx+=ax;
sprite.vy+=ay;
sprite.vx*=friction;
sprite.vy*=friction;
sprite.x+=sprite.vx;
sprite.y+=sprite.vy;
B:
sprite.vx+=(targetX-sprite.x)*spring;
sprite.vy+=(targetY-sprite.y)*spring;
sprite.vx*=friction;
sprite.vy*=friction;
sprite.x+=sprite.vx;
sprite.y+=sprite.vy;
C:
sprite.vx+=(targetX-sprite.x)*spring;
sprite.vy+=(targetY-sprite.y)*spring;
sprite.x+=(vx*=friction);
sprite.y+=(vy*=friction);
3.弹性偏移
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=fixedY+Math.sin(angle)*springLength;
