make memdev bigger than screen size

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    • make memdev bigger than screen size

      Hi.

      I use the ver5.32 EMWIN as STM32F429 board in 240x320 TFT-LCD.

      I referred to following URL and I succeed to work this project.
      wiki.segger.com/WM_MOTION_-_Move_content_(Sample)

      I made popup window above main window. and use GUI_MEMDEV_WriteAt by window callback after draw PNG image on MEMDEV size of 200x500 at popup window
      it works have some problem little bit, i wanted to draw 200x500 scrollable setting menu but it works 200x300 (max y screen size). images over y 300 is filled gray color.
      i think it is cut over the screen size and can i use memdev bigger than screen size?

      Thanks.
      Images

      • fail setting menu.jpg

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      • setting menu.jpg

        179.48 kB, 500×616, viewed 431 times

    • Hi,

      yes, this is a known issue and is already addressed. The reason is the clipping rectangle clipping the drawing into the memory device.

      With the latest emWin version we have introduced a function to get around this.

      You might try to temporarily increase the window size to the size of the memory device before drawing into the device. After filling the device restore the window to its intended size.

      Try this before writing to the memory device:

      C Source Code

      1. //
      2. // Rescue some values
      3. //
      4. xSizeOrg = WM_GetWindowSizeX(hWin);
      5. ySizeOrg = WM_GetWindowSizeY(hWin);
      6. xPosOrg = WM_GetWindowOrgX(hWin);
      7. yPosOrg = WM_GetWindowOrgY(hWin);
      9. WM_SetWindowPos(hWin, 0, 0, xSizeTemp, ySizeTemp);
      11. GUI_pContext->xOff = 0; // Offset needs to be set manually. This requires GUI_Private.h to be included
      12. GUI_pContext->yOff = 0; // Offset needs to be set manually. This requires GUI_Private.h to be included
      14. //
      15. // Write something to the memory device
      16. //
      17. DrawIntoDevice();
      19. //
      20. // Restore initial values
      21. //
      22. WM_SetWindowPos(hWin, xPosOrg, yPosOrg, xSizeOrg, ySizeOrg);
      23. GUI_pContext->xOff = xPosOrg; // Restore offset
      24. GUI_pContext->yOff = yPosOrg; // Restore offset
      Display All


      Depending on the library you are using it might be possible that you don't have access to GUI_pContext. In this case there is not much you can do except trying to get access to the latest version.

      Regards,
      Sven
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