C＃DirectX Sprite起源

问题描述

当我的Sprite旋转原点固定在窗口的左上角时（与 sprite.Draw 和 sprite.Draw2D 相同），我遇到了这个问题
方式，如果我改变旋转中心，它仍然在左上方。我需要精灵绕其Z轴旋转。

i have this problem when my Sprite rotation origin is fixed at top left corner of window (same with sprite.Draw and sprite.Draw2D)Either way if i change rotation center it's still at top left. I need sprite to rotate around its Z axis.

编辑：
我已经尝试过：

I have tried this:

    hereMatrix pm = Matrix.Translation(_playerPos.X + 8, _playerPos.Y + 8, 0);
    sprite.Transform = Matrix.RotationZ(_angle) * pm;
    sprite.Draw(playerTexture, textureSize, new Vector3(8, 8, 0), new Vector3(_playerPos.X, _playerPos.Y, 0), Color.White);

但是效果似乎不太好...

But it does not seem to works well...

推荐答案

绘制时，它在正确的位置吗？

When you draw it, is it in the correct place?

我相信乘法顺序是相反的，并且您不应该根据变换中的玩家位置进行变换。

I believe that the multiplication order is reversed, and that you shouldn't be transforming by the players position in the transform.

// shift centre to (0,0)
sprite.Transform = Matrix.Translation(-textureSize.Width / 2, -textureSize.Height / 2, 0);

// rotate about (0,0)
sprite.Transform *= Matrix.RotationZ(_angle);


sprite.Draw(playerTexture, textureSize, Vector3.Zero,
            new Vector3(_playerPos.X, _playerPos.Y, 0), Color.White);

编辑

Edit

您也可以使用 Matrix.Transformation 方法一步来获取矩阵。

You could also use the Matrix.Transformation method to get the matrix in one step.

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