memdev_fadein.c

图像系统uc_GUI

*/
/*******************************************************************
*
*       _DemoFade
*/
static void _DemoFade(void) {
  GUI_MEMDEV_Handle hMem0, hMem1,hMem2;
  GUI_RECT Rect = {0};
  int x, y, v = 0, vz = 4;
  hMem0 = GUI_MEMDEV_Create(0, 0, 138, 65); /* Contains the text */
  hMem1 = GUI_MEMDEV_Create(0, 0, 138, 65); /* Contains the bitmap */
  hMem2 = GUI_MEMDEV_Create(0, 0, 138, 65); /* Contains the fading result */
  x = (319 - _bmSeggerLogoBlue.XSize) / 2;
  y = (239 - _bmSeggerLogoBlue.YSize) / 3 * 2;
  Rect.x1 = _bmSeggerLogoBlue.XSize - 1;
  Rect.y1 = _bmSeggerLogoBlue.YSize - 1;
  /* Fill memory device with some text */
  GUI_MEMDEV_Select(hMem0);
  GUI_SetColor(GUI_RED);
  GUI_SetFont(&GUI_Font32B_ASCII);
  GUI_SetTextMode(GUI_TM_TRANS);
  GUI_DispStringInRect("Fade in", &Rect, GUI_TA_HCENTER | GUI_TA_VCENTER);
  GUI_DrawRectEx(&Rect);
  /* Fill memory device with bitmap */
  GUI_MEMDEV_Select(hMem1);
  GUI_DrawBitmap(&_bmSeggerLogoBlue, 0, 0);
  /* Fade in loop */
  while (1) {
    GUI_MEMDEV_Select(hMem2);
    GUI_Clear();                         /* Clear memory device */
    GUI_MEMDEV_Write(hMem0);             /* Fill with text */
    GUI_MEMDEV_WriteAlpha(hMem1, v);     /* Fade in bitmap */
    GUI_MEMDEV_CopyToLCDAt(hMem2, x, y); /* Copy to display */
    GUI_Delay(10);
    v += vz;
    if ((v == 0) || (v == 256)) {
      vz *= -1;
      GUI_Delay(1000);
    }
  }
}

/*******************************************************************
*
*       Public code
*
********************************************************************
*/
/*******************************************************************
*
*       MainTask
*/
void MainTask(void) {
  GUI_Init();
  GUI_SetColor(GUI_WHITE);
  GUI_SetFont(&GUI_Font24_ASCII);
  GUI_DispStringHCenterAt("MEMDEV_FadeIn - sample", 160, 5);
  GUI_SetFont(&GUI_Font16B_ASCII);
  GUI_DispStringHCenterAt("Shows how to use memory devices\nfor a 'fade in' effect", 160, 40);
  _DemoFade();
  while (1) {
    GUI_Delay(100);
  }
}