flash as2物理效果

给flash加物理效果
(1)不需要你知道什么知识,直接套用Tween类,其他效果可以去看专门讲解它的文章

test_mc.onRollOver = function() {
  new mx.transitions.Tween(this, "_xscale", mx.transitions.easing.Elastic.easeOut, this._xscale, 180, 30);
  new mx.transitions.Tween(this, "_yscale", mx.transitions.easing.Elastic.easeOut, this._yscale, 180, 30);
};
test_mc.onRollOut = function() {
  new mx.transitions.Tween(this, "_xscale", mx.transitions.easing.Elastic.easeOut, this._xscale, 100, 30);
  new mx.transitions.Tween(this, "_yscale", mx.transitions.easing.Elastic.easeOut, this._yscale, 100, 30);
};

(2)物理知识的简单运用
一,匀速运动

test_mc.onEnterFrame = function() {
  test_mc._x += 5;
  if (test_mc._x>400) {
    test_mc._x = 0;
  }
};

二.加速运动

i = 0.5;
speed = 0;
test_mc.onEnterFrame = function() {
  speed += i;
  test_mc._x += speed;
  if (test_mc._x>400) {
    test_mc._x = 0;
  }
  if (speed>50) {
    speed = 0;
  }
};

三.简谐运动

test_mc._x = 100;
speed = 0;
test_mc.onEnterFrame = function() {
  speed += (200-test_mc._x)*.05;
  test_mc._x += speed;
};

四.摩差运动的缓冲

test_mc.onEnterFrame = function() {
  test_mc._x += (300-test_mc._x)*.08;
};

五.阻尼运动

xr = 100;
dir = 1;
ang = 0;
damp = 1;
test_mc._x = 0;
test_mc.onEnterFrame = function() {
  test_mc._x += Math.sin(ang)*xr*dir*damp;
  damp *= 0.95;
  ang += 0.5;
};