c++ - 如何在 DirectX 9 中设置左上角坐标？

Question

我需要在 DirectX 9 中绘制一些东西。我有兴趣以将坐标调整为像素的方式工作，而 (0,0) 将是左上角。这是我所做的：

RECT clientRect;
::GetClientRect(m_hWIN, &clientRect);

D3DXMATRIX matOrtho2D, matIdentity;    

D3DXMatrixOrthoOffCenterLH(&matOrtho2D, 0, clientRect.right, 0, clientRect.bottom, 0.0f, 1.0f);
D3DXMatrixIdentity(&matIdentity);

g_pDirect3D_Device->SetTransform(D3DTS_PROJECTION, &matOrtho2D);
g_pDirect3D_Device->SetTransform(D3DTS_WORLD, &matIdentity);
g_pDirect3D_Device->SetTransform(D3DTS_VIEW, &matIdentity);

这很好用，除了 (0,0) 是左下角。我怎样才能改变它？谢谢！

Answer 1

这应该添加到代码中：

D3DXMATRIX matTranslate, matFlip;  

D3DXMatrixTranslation(&matTranslate, 0, clientRect.bottom, 0.0f);
D3DXMatrixRotationX(&matFlip, D3DXToRadian(180));
D3DXMATRIX matCoordTransform = matFlip * matTranslate;

g_pDirect3D_Device->SetTransform(D3DTS_WORLD, &matCoordTransform);