How to wet top-left coordinates in DerectX 9?

Question

3.00/5 (2 votes)

See more:

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

v2

Add a Solution

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Richard MacCutchan · Answer 1 · 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

Iron-Eagle · Answer 2 · 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