我创建了一个带矩阵的相机,用它来移动2D中的视点。基本上我从这个模板开始: http://torshall.se/?p=272
我的课程中还有一个用鼠标生成盒子的简单代码:
public void CreateBodies()
{
mouse = Mouse.GetState();
if (mouse.RightButton == ButtonState.Pressed)
{
Bodies += 1;
if (Bodies >= MaxBodies)
Bodies = 0;
rectBody[Bodies] = BodyFactory.CreateRectangle(world, ConvertUnits.ToSimUnits(rectangle.Width), ConvertUnits.ToSimUnits(rectangle.Height), 1);
rectBody[Bodies].Position = ConvertUnits.ToSimUnits(mouse.X, mouse.Y);
rectBody[Bodies].BodyType = BodyType.Dynamic;
}
}
这个工作非常好但是当我移动''相机'时,鼠标没有在正确的位置发生变化,我在game1.cs和我的方法中做了一点修改以获得世界的协调。我的老鼠:
mouse = Mouse.GetState();
Matrix inverse = Matrix.Invert(camera.transform);
Vector2 mousePos = Vector2.Transform(new Vector2(mouse.X, mouse.Y), inverse);
TE.CreateBodies(mousePos);
public void CreateBodies(Vector2 mousePosition)
{
mouse = Mouse.GetState();
MousePosition = mousePosition;
if (mouse.RightButton == ButtonState.Pressed)
{
Bodies += 1;
if (Bodies >= MaxBodies)
{
Bodies = 0;
}
rectBody[Bodies] = BodyFactory.CreateRectangle(world, ConvertUnits.ToSimUnits(rectangle.Width), ConvertUnits.ToSimUnits(rectangle.Height), 1);
rectBody[Bodies].BodyType = BodyType.Dynamic;
rectBody[Bodies].Position = ConvertUnits.ToSimUnits(MousePosition);
}
}
现在这应该给我世界的坐标。我的鼠标,但我有一个问题,当我运行程序并点击屏幕上的某个地方创建一个框我收到此错误:
http://img68.xooimage.com/files/6/a/4/bob-2c526f4.png
发生了什么事? :/
编辑:
这是在body.cs的第439行:
Debug.Assert(!float.IsNaN(value.X) && !float.IsNaN(value.Y));