旋转角度计算AS3

Question

我正在编写一个代码，其中舞台上有不同的环，并且一个球在这些轨道之一中旋转。点击后，球离开环，并正常运行到环。在途中，如果它击中另一个环，它将从该环击中的那个点开始旋转。我可以成功编写代码的最初部分。但是当球击中另一个环时，我遇到了问题，它不是从它击中的位置开始的。相反，它会从不同的位置开始在环中旋转。我希望我清楚地怀疑。这有点类似这个游戏https://play.google.com/store/apps/details?id=com.drgames.orbit.jumper

这里是我的代码输入框：

if(!isTravelling){ 
     rad = Math.abs(angle * (Math.PI/180)); // Converting Degrees To Radians 
     _ball.x = currOrbit.x + (currOrbit.width/2) * Math.cos(rad); // Position The Orbiter Along x-axis 
     _ball.y = currOrbit.y + (currOrbit.width/2) * Math.sin(rad); // Position The Orbiter Along y-axis 
     trace(_ball.x+" , "+_ball.y); 
     angle -= speed; // Object will orbit clockwise 
     _ball.rotation = (Math.atan2(_ball.y - currOrbit.y, _ball.x - currOrbit.x) * 180/Math.PI) + 90; 
    } 

    for(var i = 0; i < orbits.length; i++){ 
     if(orbits[i] != currOrbit){ 
      if(ObjectsHit(orbits[i], _ball)){ 
       currOrbit = orbits[i]; 
       _ball.rotation = (Math.atan2(_ball.y - currOrbit.y, _ball.x - currOrbit.x) * 180/Math.PI) + 90; 
       isTravelling = false; 
       stage.addEventListener(MouseEvent.CLICK, onClick); 
      } 
     } 
    } 

    if(isTravelling){ 
     _ball.x += Math.cos(rad) * speed * 2; 
     _ball.y += Math.sin(rad) * speed * 2; 
    } 

Answer 1

你似乎已经忘了计算起始角度为新的轨道：

if(!isTravelling){ 
     rad = Math.abs(angle * (Math.PI/180)); // Converting Degrees To Radians 
     _ball.x = currOrbit.x + (currOrbit.width/2) * Math.cos(rad); // Position The Orbiter Along x-axis 
     _ball.y = currOrbit.y + (currOrbit.width/2) * Math.sin(rad); // Position The Orbiter Along y-axis 
     trace(_ball.x+" , "+_ball.y); 
     _ball.rotation = angle // no need for calculating the angle again 
     angle -= speed; // Object will orbit clockwise 
    } 

    for(var i = 0; i < orbits.length; i++){ 
     if(orbits[i] != currOrbit){ 
      if(ObjectsHit(orbits[i], _ball)){ 
       currOrbit = orbits[i]; 
       angle = (Math.atan2(_ball.y - currOrbit.y, _ball.x - currOrbit.x) * 180/Math.PI) + 90; // Calculate the starting angle on the new orbit 
       _ball.rotation = angle // Set the balls rotation to the angle 
       isTravelling = false; 
       stage.addEventListener(MouseEvent.CLICK, onClick); 
      } 
     } 
    } 

    if(isTravelling){ 
     _ball.x += Math.cos(rad) * speed * 2; 
     _ball.y += Math.sin(rad) * speed * 2; 
    } 

这应该修复它。请注意，您可能需要为球的旋转增加或减少90度（_ball.rotation = angle + 90），因为我不是100％确定的。