8.1 图像API

8.1 图像API

Routine	Description
Drawing related functions
GUI_AddRect()	调整矩形框的大小
GUI_GetClientRect()	Returns the current available drawing area.
GUI_GetDrawMode()	Returns the current drawing mode.
GUI_GetPenSize()	Returns the current pen size in  pixels.
GUI_GetPixelIndex()	Returns the color index of a given position.
GUI_SetClipRect()	Sets the rectangle used for clipping.
GUI_SetDrawMode()	Sets the drawing mode.
GUI_SetPenSize()	Sets the pen size in pixels.
Basic drawing routines
GUI_Clear()	Fills the display / the active window with the background color.
GUI_ClearRect()	Fills a rectangular area with the background color.
GUI_CopyRect()	Copies a rectangle area on the display
GUI_DrawGradientH()	Draws a rectangle filled with a horizontal color gradient.
GUI_DrawGradientV()	Draws a rectangle filled with a vertical color gra- dient.
GUI_DrawGradientRoundedH()	Draws a rectangle with rounded corners filled with a horizontal color gradient.
GUI_DrawGradientRoundedV()	Draws a rectangle with rounded corners filled with a vertical color gradient.
GUI_DrawPixel()	Draws a single pixel.
GUI_DrawPoint()	Draws a point.
GUI_DrawRect()	Draws a rectangle.
GUI_DrawRectEx()	Draws a rectangle.
GUI_DrawRoundedFrame()	Draws a frame with rounded corners.
GUI_DrawRoundedRect()	Draws a rectangle with rounded corners.
GUI_FillRect()	Draws a filled rectangle.
GUI_FillRectEx()	Draws a filled rectangle.
GUI_FillRoundedRect()	Draws a filled rectangle with rounded corners.
GUI_InvertRect()	Invert a rectangular area.
Alpha blending
GUI_EnableAlpha()	Enables/disables automatic alpha blending
GUI_PreserveTrans()	Makes sure that alpha channel remains after drawing operations.
GUI_RestoreUserAlpha()	Restores the previous state of user alpha blend- ing
GUI_SetAlpha()	Sets the current alpha blending value. (Obso- lete)
GUI_SetUserAlpha()	Sets an additional value which is used to calcu- late the actual alpha blending value to be  used.
Drawing bitmaps
GUI_DrawBitmap()	Draws a bitmap.
GUI_DrawBitmapEx()	Draws a scaled bitmap.
GUI_DrawBitmapMag()	Draws a magnified bitmap.
GUI_SetAlphaMask8888()	Could be used for setting an additional AND and OR mask to be used for drawing the pixels of 32bpp bitmaps.

GUI_SetClipRect()

    GUI_RECT Rect = { , , ,  }, Rect2;
    GUI_AddRect(&Rect2, &Rect, -);

//    GUI_SetClipRect(&Rect2);    // 切掉，不会影响该方框。

    GUI_FillRectEx(&Rect);

    GUI_Delay();
//    GUI_SetClipRect(NULL);
    GUI_SetColor(GUI_GREEN);
    GUI_FillRectEx(&Rect);

  

    GUI_SetClipRect(&Rect2);    // 切掉，不会影响该方框。

    GUI_FillRectEx(&Rect);

    GUI_Delay();
//    GUI_SetClipRect(NULL);
    GUI_SetColor(GUI_GREEN);
    GUI_FillRectEx(&Rect);

  

    GUI_SetClipRect(&Rect2);    // 切掉，不会影响该方框。

    GUI_FillRectEx(&Rect);

    GUI_Delay();
    GUI_SetClipRect(NULL);
    GUI_SetColor(GUI_GREEN);
    GUI_FillRectEx(&Rect);