Adobe Flash cs4旋转数学
Adobe Flash cs4旋转数学
提问于 2011-06-30 10:24:11
我目前在旋转我的对象面对另一个object.currently时遇到了问题它工作得很好就像在这张图片中，我的对象在原点将能够旋转并移动到除正90度到180度的象限之外的3个象限中的对象，我的对象将在移动到对象的同时旋转几个完整的旋转一段时间，有人知道为什么吗？我用来旋转的句子是rotation += (foodLocationDegrees - (rotation - 90)) * .2;，用来计算食物
var angle:Number = Math.atan2(foodTarget.y - y, foodTarget.x - x);
foodLocationDegrees =Math.floor((angle * 180 / Math.PI));Y和x是鱼的对象，而foodtarget是食物的对象。
public function moveToFood():void
{
var dx:Number = x - _destinationX;
var dy:Number = y - _destinationY;
trace("Food location degree relative to fish mouth "+foodLocationDegrees);
var targetRotation:Number = 0;
if (foodLocationDegrees > 0 && foodLocationDegrees < 90)
{
trace("food is on 1st quadrant of the fish mount");
this.x -= dx / 18;
this.y -= dy / 18;
}else if (foodLocationDegrees > 90 && foodLocationDegrees < 180)
{
trace("food is on 2nd quadrant of the fish mount");
this.x -= dx / 18;
this.y -= dy / 18;
}else if (foodLocationDegrees > -180 && foodLocationDegrees < -90)
{
trace("food is on 3nd quadrant of the fish mount");
this.x -= dx / 18;
this.y -= dy / 18;
}else if (foodLocationDegrees < 0 && foodLocationDegrees > -90)
{
trace("food is on 4nd quadrant of the fish mount");
this.x -= dx / 18;
this.y -= dy / 18;
}
trace("Before adding Rotation " + rotation);
var number:Number = (foodLocationDegrees - (rotation - 90)) * .1;
trace("rotation to add "+number);
rotation += (foodLocationDegrees - (rotation - 90)) * .2;
trace("After adding Rotation " + rotation);
//removing food when both hit boxes hit
if (hit.hitTestObject(foodTarget.hit))
{
foodInPond--;
foodTarget.removeSelf();
}
}回答 1
Stack Overflow用户
回答已采纳
发布于 2011-06-30 10:53:34
public function moveToFood(food:Food):void
{
var speed:Number = 6.5;
var a:Number = food.x - x;
var b:Number = food.y - y;
var ang:Number = Math.atan2(b, a);
rotation = ang * 180 / Math.PI;
x += Math.cos(ang) * speed;
y += Math.sin(ang) * speed;
}你不能只使用sin和cos来朝你面对的方向移动吗？
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原文链接：
https://stackoverflow.com/questions/6529348
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