Start with the project you created in Low-Level DigitalPaint: Initializing and Freeing a Paint Handle. This tutorial will let you add code to set DigitalPaint information such as transformation, device context, bitmap canvas and restriction palette information.
1. |
Add the following declarations to the WndProc function: |
static PAINTXFORM PntXForm ;
RECT rcDCRect ;
2. |
Add this line after the hDC = GetDC( hWnd); function call in the "case IDM_FILE_OPEN:" option of the WM_COMMAND message in the WndProc function: |
hPalette = L_CreatePaintPalette( hDC, &hBitmap ) ;
L_PntSetMetrics ( pPaint, hDC, &hBitmap, hPalette ) ;
DeleteObject(hPalette);
3. |
Declare the following variable in the "case IDM_FILE_OPEN:" option of the WM_COMMAND message in the WndProc function: right after HDC hDC; |
HPALETTE hPalette;
3. |
Add the following code after the OnSize function call in the WM_SIZE message in the WndProc function: |
// set the toolkit transformations.PntXForm.nZoom = nZoomFactor ;PntXForm.nXOffset = - rcView.left ;PntXForm.nYOffset = - rcView.top ;L_PntSetTransformation ( pPaint, &PntXForm ) ;// set the device context boundariesSetRect ( &rcDCRect, 0, 0, LOWORD ( lParam ), HIWORD ( lParam ) ) ;L_PntSetDCExtents ( pPaint, &rcDCRect ) ;
4. |
Add the following code after the OnHScroll function call in the WM_HSCROLL message in the WndProc function: |
// set the toolkit transformations.PntXForm.nZoom = nZoomFactor ;PntXForm.nXOffset = - rcView.left ;PntXForm.nYOffset = - rcView.top ;L_PntSetTransformation ( pPaint, &PntXForm ) ;
5. |
Add the following code after the OnVScroll function call in the WM_VSCROLL message in the WndProc function: |
// set the toolkit transformations.PntXForm.nZoom = nZoomFactor ;PntXForm.nXOffset = - rcView.left ;PntXForm.nYOffset = - rcView.top ;L_PntSetTransformation ( pPaint, &PntXForm ) ;
6. |
Compile and run the project by selecting Build->Execute tutorial.exe from the menu. |
