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我创建了一个带有矩阵的相机,并用它来移动二维的视点。基本上我从这个模板开始: http ://torshall.se/?p=272

我在我的一堂课上也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;
        }
    }

这工作得很好,但是当我移动“相机”时,鼠标没有在正确的位置改变,我在 game1.cs 和我的方法中做了这个小修改来获得世界坐标。我的鼠标:

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坐标。我的鼠标,但我有一个问题,当我运行程序并单击屏幕上的某处以创建一个框时,我收到此错误:

http://img68.xooimage.com/files/6/a/4/bob-2c526f4.png

这是怎么回事?:/

编辑:

这是 body.cs 的第 439 行:

Debug.Assert(!float.IsNaN(value.X) && !float.IsNaN(value.Y));
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