How to rotate a text insode a window?

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  • How to rotate a text insode a window?

    I am Windows Manager and I have a window fully populated.
    I would like to rotate some text boxes widgets. I believe they do not support the rotation method.

    I saw at the manual that we can use "rotated" texts, as follows:
    GUI_RECT Rect = {166+(18)*1, 72, 40, 80};
    char acText[] = "Rotated\ntext";
    GUI_SetTextMode(GUI_TM_XOR);
    GUI_FillRectEx(&Rect);
    GUI_DispStringInRectEx(acText, &Rect, GUI_TA_HCENTER | GUI_TA_VCENTER, strlen(acText), GUI_ROTATE_CCW);

    However, this piece of code is not working at my window: it does not shows up. Is it incompatible with WM?

    Any hint of how to solve this issue?

    Thanks.

  • Hello Ajax,

    I have written a small sample which shows how to draw rotated text and how to overwrite a callback.

    C Source Code

    1. #include <string.h>
    3. #include "DIALOG.h"
    5. /*********************************************************************
    6. *
    7. * Static code
    8. *
    9. **********************************************************************
    10. */
    11. /*********************************************************************
    12. *
    13. * _cbWin
    14. */
    15. static void _cbText(WM_MESSAGE * pMsg) {
    16. GUI_RECT Rect;
    17. char aBuffer[255];
    19. switch (pMsg->MsgId) {
    20. case WM_PAINT:
    21. //
    22. // Fill window with fancy red
    23. //
    24. GUI_SetBkColor(GUI_RED);
    25. GUI_Clear();
    26. //
    27. // Get the area of the client, in this case the text widget
    28. //
    29. WM_GetClientRect(&Rect);
    30. //
    31. // Receive the text previously set while creating the widget
    32. //
    33. TEXT_GetText(pMsg->hWin, aBuffer, sizeof(aBuffer));
    34. //
    35. // Display rotated text inside a rectangle (the client one)
    36. //
    37. GUI_DispStringInRectEx(aBuffer, &Rect, GUI_TA_HCENTER | GUI_TA_VCENTER,
    38. strlen(aBuffer), GUI_ROTATE_CCW);
    39. break;
    40. default:
    41. //
    42. // Call the default callback just in case something else has to be done
    43. //
    44. TEXT_Callback(pMsg);
    45. }
    46. }
    48. /*********************************************************************
    49. *
    50. * Public code
    51. *
    52. **********************************************************************
    53. */
    54. /*********************************************************************
    55. *
    56. * MainTask
    57. */
    58. void MainTask(void) {
    59. WM_HWIN hItem;
    60. GUI_RECT Rect;
    61. char acText[] = "Text";
    63. GUI_Init();
    64. //
    65. // Define rectangle to draw text in
    66. //
    67. Rect.x0 = 0;
    68. Rect.y0 = 0;
    69. Rect.x1 = 100;
    70. Rect.y1 = 100;
    71. //
    72. // Draw a back ground
    73. //
    74. GUI_DrawGradientH(0, 0, LCD_GetXSize(), LCD_GetYSize(), GUI_DARKGRAY, GUI_GRAY);
    75. //
    76. // Set Text and set text mode to transparent
    77. //
    78. GUI_SetFont(&GUI_Font32B_1);
    79. GUI_SetTextMode(GUI_TM_TRANS);
    80. //
    81. // Dispplay a string inside a rectangle, rotated 90 degrees ccw
    82. //
    83. GUI_DispStringInRectEx(acText, &Rect, GUI_TA_HCENTER | GUI_TA_VCENTER, strlen(acText), GUI_ROTATE_CCW);
    84. //
    85. // Create a TEXT widget and overwrite its callback
    86. //
    87. hItem = TEXT_Create(100, 0, 100, 100, 0, WM_CF_SHOW, acText, GUI_TA_HCENTER | GUI_TA_VCENTER);
    88. WM_SetCallback(hItem, _cbText);
    89. while (1) {
    90. GUI_Delay(100);
    91. }
    92. }
    Display All


    For further information on how to overwrite a callback please refer to the emWin user manual (UM03001_emWin5.pdf) chapter 18.2.3 "Overwriting callback functions".

    Regards,
    Sven
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