www.pudn.com > UCGUI390a.rar > GUIAACircle.c

/* 
********************************************************************************************************* 
*                                                uC/GUI 
*                        Universal graphic software for embedded applications 
* 
*                       (c) Copyright 2002, Micrium Inc., Weston, FL 
*                       (c) Copyright 2002, SEGGER Microcontroller Systeme GmbH 
* 
*              µC/GUI is protected by international copyright laws. Knowledge of the 
*              source code may not be used to write a similar product. This file may 
*              only be used in accordance with a license and should not be redistributed 
*              in any way. We appreciate your understanding and fairness. 
* 
---------------------------------------------------------------------- 
File        : GUICirleAA.C 
Purpose     : Draw Circle routines with Antialiasing 
 
TBD: Circle needs to be calculated from top to bottom in order 
to avoid AA problems at certain positions.   
     
---------------------------END-OF-HEADER------------------------------ 
*/ 
 
#include "GUI_Protected.h" 
 
#include  
#include  
#include  
 
#if GUI_SUPPORT_AA 
 
/********************************************************************* 
* 
*       Static code 
* 
********************************************************************** 
*/ 
/********************************************************************* 
* 
*       FillCircle 
*/ 
static void FillCircle(int x0, int y0, int r) { 
  int i, x; 
  int sqmax = r*r+r/2; 
  int yMin, yMax; 
  /* First step : find uppermost and lowermost coordinates */ 
  yMin = y0 - r; 
  yMax = y0 + r; 
  /* Use Clipping rect to reduce calculation (if possible) */ 
  if (GUI_Context.pClipRect_HL) { 
    if (yMax > GUI_Context.pClipRect_HL->y1) 
      yMax = GUI_Context.pClipRect_HL->y1; 
    if (yMin < GUI_Context.pClipRect_HL->y0) 
      yMin = GUI_Context.pClipRect_HL->y0; 
  } 
  /* Draw top half */ 
  for (i=0, x=r; i= yMin) && (y <= yMax)) { 
      /* calc proper x-value */ 
      while ((i*i+x*x) >sqmax) 
        --x; 
      LCD_HL_DrawHLine (x0-x, y, x0+x); 
    } 
  } 
  /* Draw bottom half */ 
  for (i=0, x=r; i= yMin) && (y <= yMax)) { 
      /* calc proper x-value */ 
      while ((i*i+x*x) >sqmax) 
        --x; 
      LCD_HL_DrawHLine (x0-x, y, x0+x); 
    } 
  } 
} 
 
/********************************************************************* 
* 
*       Public code 
* 
********************************************************************** 
*/ 
/********************************************************************* 
* 
*       GL_FillCircleAA_HiRes 
*/ 
void GL_FillCircleAA_HiRes(int x0, int y0, int r) { 
/* Init AA Subsystem, pass horizontal limits */ 
  GUI_AA_Init_HiRes(x0-r, x0+r); 
/* Do the actual drawing */ 
  FillCircle(x0, y0, r); 
/* Cleanup */ 
  GUI_AA_Exit(); 
} 
 
/********************************************************************* 
* 
*       GUI_AA_FillCircle 
*/ 
void GUI_AA_FillCircle(int x0, int y0, int r) { 
  #if (GUI_WINSUPPORT) 
    GUI_RECT Rect; 
  #endif 
  GUI_LOCK(); 
  #if (GUI_WINSUPPORT) 
    WM_ADDORG_AA(x0,y0); 
  #endif 
  if (!GUI_Context.AA_HiResEnable) { 
    x0 *= GUI_Context.AA_Factor; 
    y0 *= GUI_Context.AA_Factor; 
    r  *= GUI_Context.AA_Factor; 
  } 
  #if (GUI_WINSUPPORT) 
    Rect.x0 = GUI_AA_HiRes2Pixel(x0 - r); 
    Rect.x1 = GUI_AA_HiRes2Pixel(x0 + r); 
    Rect.y0 = GUI_AA_HiRes2Pixel(y0 - r); 
    Rect.y1 = GUI_AA_HiRes2Pixel(y0 + r); 
    WM_ITERATE_START(&Rect); { 
  #endif 
  GL_FillCircleAA_HiRes(x0, y0, r); 
  #if (GUI_WINSUPPORT) 
    } WM_ITERATE_END(); 
  #endif 
  GUI_UNLOCK(); 
} 
 
#else                            /* Avoid problems with empty object modules */ 
  void GUIAACircle_C(void); 
  void GUIAACircle_C(void) {} 
#endif /* GUI_SUPPORT_AA */ 
 
/*************************** End of file ****************************/