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[D3D9] 'Drawing' into window

Started by exextatic Feb 13, 2012 at 3:41 AM 14 replies 2.8k views

Original Post

Feb 13, 2012 at 3:41 AM

Hi all,

Working on a level editor for my engine (still), and I'm at a loss as to how I should go about this next bit.
I want to have the user click, drag and release to make a box (which will be turned into a plane - 2D engine).
I can't seem to get the mouse coordinates to relate to the position in the 3d view.
Heres an image just so you guys can see what I've currently got:

Note, it has 3D views because I want this editor to be re-usable in the future.

Any help appreciated,

Thanks,
James Warner

exextatic

Feb 14, 2012 at 2:56 AM

Bump.. Anyone able to help?

Evil Steve

Feb 14, 2012 at 12:41 PM

In what way can you not get the mouse coordinates to relate to 3D positions? You can use D3DXVec3Unproject() to convert from screen space to world space.

exextatic

Feb 15, 2012 at 8:45 AM

Cool thanks, will look into it when I fix the rendering engine part

exextatic

Feb 16, 2012 at 9:04 AM

Okay fixed the rendering engine (finally).

Heres the code I have currently for adding planes:

void Editor::addPlane(D3DXVECTOR3 oldMPos, D3DXVECTOR3 oldMDir, string texName, float* texScale, int whichForm)
 {
 D3DXMATRIX matView; 
 if(whichForm == 0)
 {
 fpsCamera->calculateViewMatrix(&matView);
 cameraPos[whichForm] = fpsCamera->getPosition();
 cameraEyePos[whichForm] = fpsCamera->getEyePos();
 }
 else
 {
 D3DXMatrixLookAtLH(&matView,
 &cameraPos[whichForm], 
 &cameraEyePos[whichForm], 
 &D3DXVECTOR3 (0.0f, 1.0f, 0.0f)); 
 }
 d3ddev->SetTransform(D3DTS_VIEW, &matView); 
 
 D3DXMATRIX matProjection; 
 D3DXMatrixPerspectiveFovLH(&matProjection,
 D3DXToRadian(45),
 (FLOAT)screenSize[whichForm].x / (FLOAT)screenSize[whichForm].y, 
 1.0f, 
 100.0f); 
 d3ddev->GetTransform(D3DTS_PROJECTION, &matProjection); 
 
 
 D3DXVECTOR3 finalPos, size, firstMDir = oldMPos, curMDir = pickRaysOrigin[whichForm];
 
 //Get position
 bool interpolatedOnY = false;
 for(int i = 0; i < 100; i++)
 {
 if(firstMDir.y > 3.0f)
 {
 interpolatedOnY = true;
 break;
 }
 
 firstMDir += oldMDir;
 }
 
 if(!interpolatedOnY)
 return; // Wasn't available on Y axis - User managed to get Camera not to face right axis?
 
 finalPos = firstMDir;
 interpolatedOnY = false;
 
 //Get size
 for(int i = 0; i < 100; i++)
 {
 if(curMDir.y > 3.0f)
 {
 interpolatedOnY = true;
 break;
 }
 
 curMDir += pickRaysDir[whichForm];
 }
 
 if(!interpolatedOnY)
 return; // Wasn't available on Y axis - User managed to get Camera not to face right axis?
 
 if(firstMDir > curMDir)
 size = firstMDir - curMDir;
 else
 size = curMDir - firstMDir;
 
 addPlane(D3DXVECTOR2(finalPos.x, finalPos.y), D3DXVECTOR2(size.x, size.y), 0.0f, PhysDefinition(NoPhysics, 0.0f, 0.0f, 0.0f), ForeGroundPlane, TextureDefinition(texName, D3DXVECTOR2(texScale[0], texScale[1]), 0.0f));
 }

It just ends up in the entirely wrong place.

exextatic

Feb 17, 2012 at 2:53 AM

Bump.

exextatic

Feb 17, 2012 at 5:57 AM

void Editor::addPlane(D3DXVECTOR3 oldMPos, D3DXVECTOR3 oldMDir, string texName, float* texScale, int whichForm)
 {
 D3DXMATRIX matView; 
 if(whichForm == 0)
 {
 fpsCamera->calculateViewMatrix(&matView);
 cameraPos[whichForm] = fpsCamera->getPosition();
 cameraEyePos[whichForm] = fpsCamera->getEyePos();
 }
 else
 {
 D3DXMatrixLookAtLH(&matView,
 &cameraPos[whichForm], 
 &cameraEyePos[whichForm], 
 &D3DXVECTOR3 (0.0f, 1.0f, 0.0f)); 
 }
 d3ddev->SetTransform(D3DTS_VIEW, &matView); 
 
 D3DXMATRIX matProjection; 
 D3DXMatrixPerspectiveFovLH(&matProjection,
 D3DXToRadian(45),
 (FLOAT)screenSize[whichForm].x / (FLOAT)screenSize[whichForm].y, 
 1.0f, 
 100.0f); 
 d3ddev->SetTransform(D3DTS_PROJECTION, &matProjection); 
 
 POINT mousePos;
 GetCursorPos(&mousePos);
 
 D3DXVECTOR3 mouseOut, mouseOut2, mouseFinal;
 D3DVIEWPORT9 viewPort;
 D3DXMATRIX matWorld;
 
 d3ddev->GetTransform(D3DTS_WORLD, &matWorld);
 d3ddev->GetViewport(&viewPort);
 
 ScreenToClient(hWnd[whichForm], &mousePos);
 
 D3DXVec3Unproject(&mouseOut, &D3DXVECTOR3(mousePos.x, mousePos.y, viewPort.MinZ), &viewPort, &matProjection, &matView, &matWorld);
 D3DXVec3Unproject(&mouseOut2, &D3DXVECTOR3(mousePos.x, mousePos.y, viewPort.MaxZ), &viewPort, &matProjection, &matView, &matWorld);
 
 float wz = 3.0f;
 float wx = ((wz - mouseOut.z) * (mouseOut2.x - mouseOut.x)) / (mouseOut2.z - mouseOut.z) + mouseOut.x;
 float wy = ((wz - mouseOut.z) * (mouseOut2.y - mouseOut.y)) / (mouseOut2.z - mouseOut.z) + mouseOut.y;
 
 mouseFinal = D3DXVECTOR3(wx, wy, wz);
 
 addPlane(D3DXVECTOR2(mouseFinal.x, mouseFinal.y), D3DXVECTOR2(1.0f, 1.0f), 0.0f, PhysDefinition(NoPhysics, 0.0f, 0.0f, 0.0f), ForeGroundPlane, TextureDefinition(texName, D3DXVECTOR2(texScale[0], texScale[1]), 0.0f));
 }

Thats my new code to try out (still not working, but slightly better). I would upload the editor files for you to see for your self, but my ISP has my internet connection capped down to 25KB/s for the next 2 days.

exextatic

Feb 18, 2012 at 2:06 AM

I've uploaded the editor so you guys can see what happens (Make a new Map file, and right click on the bottom right hand render screen)
http://jameswarner.co.cc/Files/Other/Editor.rar
Heres what happens when I right click (on the red dot). I clicked a few times and it seems to alternate between the 2 different positions that the Planes spawn at.

Evil Steve

Feb 21, 2012 at 2:07 PM

I don't have time to look in-depth just now, but I'd suggest printing out the various coordinates fed in and out of your picking code to see why the position is flickering between two locations like that. If you can get it so that it's in one position, that'll make it easier to narrow down. Then, if it's still wrong by a fixed offset, check that the top left coordinate of the viewport is correct, that your input mouse coordinates are relative to the viewport and not in screen space, and so on.

exextatic

Feb 22, 2012 at 8:25 AM

I don't have time to look in-depth just now, but I'd suggest printing out the various coordinates fed in and out of your picking code to see why the position is flickering between two locations like that. If you can get it so that it's in one position, that'll make it easier to narrow down. Then, if it's still wrong by a fixed offset, check that the top left coordinate of the viewport is correct, that your input mouse coordinates are relative to the viewport and not in screen space, and so on.

Thats made me think, is there a viewport per-swapchain? Im just using GetViewport() to get a viewport, and using that in the D3DXVec3Unproject()
Also, I think I've fixed it from flickering between places (restores the world matrix from when the app started instead of using the current world matrix).
Its still off from the mouse position though.

exextatic

Feb 25, 2012 at 11:13 PM

Ok, gonna post some more code and upload the latest version for you guys..
Heres the picking code at the moment:

void Editor::addPlane(D3DXVECTOR3 oldMPos, D3DXVECTOR3 oldMDir, string texName, float* texScale, int whichForm)
 {
 D3DXMATRIX matView, matWorld;
 d3ddev->SetTransform(D3DTS_WORLD, &matStart);
 matWorld = matStart;
 
 if(whichForm == 0)
 {
 fpsCamera->calculateViewMatrix(&matView);
 cameraPos[whichForm] = fpsCamera->getPosition();
 cameraEyePos[whichForm] = fpsCamera->getEyePos();
 }
 else
 {
 D3DXMatrixLookAtLH(&matView,
 &cameraPos[whichForm], 
 &cameraEyePos[whichForm],
 &D3DXVECTOR3 (0.0f, 1.0f, 0.0f));
 }
 d3ddev->SetTransform(D3DTS_VIEW, &matView);
 
 D3DXMATRIX matProjection; 
 D3DXMatrixPerspectiveFovLH(&matProjection,
 D3DXToRadian(45),
 (FLOAT)screenSize[whichForm].x / (FLOAT)screenSize[whichForm].y, 
 1.0f,
 100.0f); 
 d3ddev->SetTransform(D3DTS_PROJECTION, &matProjection);
 
 POINT mousePos;
 GetCursorPos(&mousePos);
 
 D3DXVECTOR3 mouseOut, mouseOut2;
 D3DVIEWPORT9 viewPort;
 
 d3ddev->GetViewport(&viewPort);
 
 ScreenToClient(hWnd[whichForm], &mousePos);
 
 D3DXVec3Unproject(&mouseOut, &D3DXVECTOR3(mousePos.x, mousePos.y, viewPort.MinZ), &viewPort, &matProjection, &matView, &matWorld);
 D3DXVec3Unproject(&mouseOut2, &D3DXVECTOR3(mousePos.x, mousePos.y, viewPort.MaxZ), &viewPort, &matProjection, &matView, &matWorld);
 
 float wz = 3.0f;
 float wx = ((wz - mouseOut.z) * (mouseOut2.x - mouseOut.x)) / (mouseOut2.z - mouseOut.z) + mouseOut.x;
 float wy = ((wz - mouseOut.z) * (mouseOut2.y - mouseOut.y)) / (mouseOut2.z - mouseOut.z) + mouseOut.y;
 D3DXVECTOR3 mouseFinal = D3DXVECTOR3(wx, wy, wz);
 
 addPlane(D3DXVECTOR2(mouseFinal.x, mouseFinal.y), D3DXVECTOR2(1.0f, 1.0f), 0.0f, PhysDefinition(NoPhysics, 0.0f, 0.0f, 0.0f), ForeGroundPlane, TextureDefinition(texName, D3DXVECTOR2(texScale[0], texScale[1]), 0.0f));
 }