/***********************************************************************************************************                                                uC/GUI*                        Universal graphic software for embedded applications**                       (c) Copyright 2002, Micrium Inc., Weston, FL*                       (c) Copyright 2002, SEGGER Microcontroller Systeme GmbH**              礐/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.CPurpose     : Draw Circle routines with AntialiasingTBD: Circle needs to be calculated from top to bottom in orderto avoid AA problems at certain positions.      ---------------------------END-OF-HEADER------------------------------*/#include "GUI_Protected.H"#include <stdio.h>#include <string.h>#include <math.h>/***********************************************************************       Static code************************************************************************/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<r; i++) {    int y = y0-i;    if ((y >= 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<r; i++) {    int y = y0 + i;    if ((y >= yMin) && (y <= yMax)) {      /* calc proper x-value */      while ((i*i+x*x) >sqmax)        --x;      LCD_HL_DrawHLine (x0-x, y, x0+x);    }  }}/***********************************************************************                       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();}/***********************************************************************                       GL_FillCircleAA************************************************************************/void GUI_AA_FillCircle(int x0, int y0, int r) {  #if (GUI_WINSUPPORT)    GUI_RECT Rect;  #endif  if (!GUI_Context.AA_HiResEnable) {    x0 *= GUI_Context.AA_Factor;    y0 *= GUI_Context.AA_Factor;    r  *= GUI_Context.AA_Factor;  }  GUI_LOCK();  #if (GUI_WINSUPPORT)    WM_ADDORG(x0,y0);    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();}