How to wet top-left coordinates in DerectX 9?

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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:

C++

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 20:11pm

Iron-Eagle

Updated 26-Dec-12 20:12pm

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Iron-Eagle · Answer 1 · 2012-12-27T01:33:00

Solution 3

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);

Posted 27-Dec-12 1:33am

Iron-Eagle

Richard MacCutchan · Answer 2 · 2012-12-27T00:41:00

Solution 2

DirectX uses the bottome left of the image as its origin, as described here[^].

Posted 27-Dec-12 0:41am

Richard MacCutchan