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How to wet top-left coordinates in DerectX 9?
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See more: C++WindowsDirectX
Hello!!
 
I need to draw something in DirectX 9.
I am interested to work in a way that the coordinates will be adjusted to pixels, while (0,0) will be the TopLeft corner. Here is what I do:
 
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);
 
This works fine, except the (0,0) is the BottomLeft corner. How can I change it?
Thanks!
Posted 26 Dec '12 - 20:11
Iron-Eagle339
Edited 26 Dec '12 - 20:12
v2
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2 solutions

DirectX uses the bottome left of the image as its origin, as described here[^].
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Posted 27 Dec '12 - 0:41
Richard MacCutchan295K
This should be added to the code:
D3DXMatrixTranslation(&matTranslate, 0, (float)clientRect.bottom, 0.0f);
D3DXMatrixRotationX(&matFlip, D3DXToRadian(180));
D3DXMATRIX matCoordTransform = matFlip * matTranslate;
 
g_pDirect3D_Device->SetTransform(D3DTS_WORLD, &matCoordTransform);
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Posted 27 Dec '12 - 1:33
Iron-Eagle339
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