在旋转的精灵上实现每个像素的碰撞 [英] Implementing per pixel collision on rotated sprites
问题描述
我正在使用C＃在XNA中构建2D游戏，并且我使用的精灵将跟踪玩家的位置并在spritebatch.Draw（）方法中相应地旋转。我现在正在尝试实现每个像素的碰撞检测，并且我相信子画面的旋转会使其消失。冲突检查如下。
私人布尔冲突（矩形对象1，颜色[，]数据A，矩形对象2，颜色[， ] dataB）
{
if（object1.Bottom&object2.Top）
return perPixel（object1，dataA，object2，dataB）;
if（object1.Top> object2.Bottom）
返回perPixel（object1，dataA，object2，dataB）;
if（object1.Left> object2.Right）
返回perPixel（object1，dataA，object2，dataB）;
if（object1.Right< object2.Left）
返回perPixel（object1，dataA，object2，dataB）;
返回true；
}
私人布尔值perPixel（Rectangle object1，Color [，] dataA，Rectangle object2，Color [，] dataB）
{
//碰撞范围
int top = Math.Max（object1.Top，object2.Top）;
int bottom = Math.Min（object1.Bottom，object2.Bottom）;
int left = Math.Max（object1.Left，object2.Left）;
int right = Math.Min（object1.Right，object2.Right）;
//检查每个像素
是否为（int y = top; y< bottom; y ++）
{
for（int x = left; x<右； x ++）
{
颜色colourA = dataA [x，y];
颜色colourB = dataB [x，y];
如果（colourA.A！= 0&& colourB.A！= 0）
{
返回true;
}
}
}
返回false；
}
只有一组被检查的精灵会旋转，如果那样的话
当我对旋转的sprit进行碰撞检测时，我遇到了一个非常相似的问题。
我基本上所做的是旋转由spriteBatch.Draw（）的旋转参数传递的角度，旋转由spriteBatch.Draw（）
RectangleofSpriteToBeRotated {中的每个X
中的每个X RectangleofSpriteToBeRotated {
Vector2 temp = Vector2.Transform（PointXY，Matrix.CreateRotationZ（Theta））;
//将点温度保存在新的2D数组中
}
}
如果您确实不明白我在说什么，请发表评论，我会尽力阐述。
更新：
您应该尝试这样做，我假设应该旋转第二个Sprite，但我没有运行此代码
私人布尔冲突（矩形object1， Color [，] dataA，Rectangle object2，Color [，] dataB）
{
var RotatedP0 = new Vector2.Transform（new Vector2（object2.Top，object2.Left），Matrix。 CreateRotationZ（theta））;
var RotatedP1 = new Vector2.Transform（new Vector2（object2.Bottom，object2.Right），Matrix.CreateRotationZ（theta））;
if（object1.Bottom< RotatedP0.Y）
return perPixel（object1，dataA，object2，dataB）;
if（object1.Top> RotatedP1.Y）
返回perPixel（object1，dataA，object2，dataB）;
if（object1.Left> RotatedP1.X）
返回perPixel（object1，dataA，object2，dataB）;
if（object1.Right< RotatedP0.X）
return perPixel（object1，dataA，object2，dataB）;
返回true；
}
私人布尔值perPixel（Rectangle object1，Color [，] dataA，Rectangle object2，Color [，] dataB）
{
//碰撞范围
int top = Math.Max（object1.Top，object2.Top）;
int bottom = Math.Min（object1.Bottom，object2.Bottom）;
int left = Math.Max（object1.Left，object2.Left）;
int right = Math.Min（object1.Right，object2.Right）;
//检查每个像素
是否为（int y = top; y< bottom; y ++）
{
for（int x = left; x<右； x ++）
{
颜色colourA = dataA [x，y];
Vector2 v = Vector2.Transform（new Vector2（x，y），Matrix.CreateRotationZ（theta））;
颜色colourB = dataB [（int）v.X，（int）v.Y];
如果（colourA.A！= 0&& colourB.A！= 0）
{
返回true;
}
}
}
返回false；
}
I am building a 2D game in XNA using C#, and I am using sprites that will track the player's position and rotate accordingly in the spritebatch.Draw() method. I am now trying to implement per-pixel collision detection, and I believe that the rotation of the sprites is throwing it off. The collision checks are as follows.
private bool collision(Rectangle object1, Color[,] dataA, Rectangle object2, Color[,] dataB)
{
if (object1.Bottom < object2.Top)
return perPixel(object1, dataA, object2, dataB);
if (object1.Top > object2.Bottom)
return perPixel(object1, dataA, object2, dataB);
if (object1.Left > object2.Right)
return perPixel(object1, dataA, object2, dataB);
if (object1.Right < object2.Left)
return perPixel(object1, dataA, object2, dataB);
return true;
}
private bool perPixel(Rectangle object1, Color[,] dataA, Rectangle object2, Color[,] dataB)
{
//Bounds of collision
int top = Math.Max(object1.Top, object2.Top);
int bottom = Math.Min(object1.Bottom, object2.Bottom);
int left = Math.Max(object1.Left, object2.Left);
int right = Math.Min(object1.Right, object2.Right);
//Check every pixel
for (int y = top; y < bottom; y++)
{
for (int x = left; x < right; x++)
{
Color colourA = dataA[x, y];
Color colourB = dataB[x, y];
if (colourA.A != 0 && colourB.A != 0)
{
return true;
}
}
}
return false;
}
Only one of the sets of sprites being checked against will be rotated, if that will help.
I faced a very similar problem , when i was doing collision detection on a rotated sprited. What i basically did was rotate the rectangle bounding the sprite by an angle theta , here theta was the angle passed in the rotation parameter of spriteBatch.Draw()
A very naive implementation of what i am saying is.
for each X in RectangleofSpriteToBeRotated{
for each Y in RectangleofSpriteToBeRotated{
Vector2 temp = Vector2.Transform(PointXY, Matrix.CreateRotationZ(Theta));
//Save Point Temp in a new 2D Array
}
}
If you do/did not understand what i am saying then please comment , i will try to elaborate.
Update: You should try doing this, I am assuming that the Second Sprite should be rotated, i haven't run this code
private bool collision(Rectangle object1, Color[,] dataA, Rectangle object2, Color[,] dataB)
{
var RotatedP0= new Vector2.Transform( new Vector2( object2.Top,object2.Left ),Matrix.CreateRotationZ(theta));
var RotatedP1= new Vector2.Transform( new Vector2 (object2.Bottom,object2.Right),Matrix.CreateRotationZ(theta ) );
if (object1.Bottom < RotatedP0.Y)
return perPixel(object1, dataA, object2, dataB);
if (object1.Top > RotatedP1.Y)
return perPixel(object1, dataA, object2, dataB);
if (object1.Left > RotatedP1.X)
return perPixel(object1, dataA, object2, dataB);
if (object1.Right < RotatedP0.X)
return perPixel(object1, dataA, object2, dataB);
return true;
}
private bool perPixel(Rectangle object1, Color[,] dataA, Rectangle object2, Color[,] dataB)
{
//Bounds of collision
int top = Math.Max(object1.Top, object2.Top);
int bottom = Math.Min(object1.Bottom, object2.Bottom);
int left = Math.Max(object1.Left, object2.Left);
int right = Math.Min(object1.Right, object2.Right);
//Check every pixel
for (int y = top; y < bottom; y++)
{
for (int x = left; x < right; x++)
{
Color colourA = dataA[x, y];
Vector2 v = Vector2.Transform(new Vector2(x,y), Matrix.CreateRotationZ(theta));
Color colourB = dataB[ (int) v.X, (int) v.Y];
if (colourA.A != 0 && colourB.A != 0)
{
return true;
}
}
}
return false;
}
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