www.pudn.com > UCGUI390a.rar > GUIAALine.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        : GUIAALine.C 
Purpose     : Drawing lines with antialiasing 
---------------------------END-OF-HEADER------------------------------ 
*/ 
 
#include "GUI_Protected.h" 
#include  
 
#if GUI_SUPPORT_AA 
 
/********************************************************************* 
* 
*       Static code 
* 
********************************************************************** 
*/ 
/********************************************************************* 
* 
*       _AA_DrawLine 
*/ 
static void _AA_DrawLine(int x0, int y0, int x1, int y1) { 
  int xMin, xMax; 
  U8 PenSizeOld = GUI_GetPenSize(); 
  U8 PenSizeHR  = PenSizeOld * GUI_Context.AA_Factor; 
  U8 OldPenShape = GUI_SetPenShape(GUI_PS_FLAT); 
  /* Calculate left and right borders for AA module */ 
  if (x0 < x1) { 
    xMin = x0; 
    xMax = x1; 
  } else { 
    xMin = x1; 
    xMax = x0; 
  } 
  if (GUI_Context.AA_HiResEnable) { 
    xMin -= PenSizeHR; 
    xMax += PenSizeHR; 
    xMin /= GUI_Context.AA_Factor; 
    xMax /= GUI_Context.AA_Factor; 
  } else { 
    xMin -= PenSizeOld; 
    xMax += PenSizeOld; 
    x0 *= GUI_Context.AA_Factor; 
    x1 *= GUI_Context.AA_Factor; 
    y0 *= GUI_Context.AA_Factor; 
    y1 *= GUI_Context.AA_Factor; 
  } 
  /* Do the actual drawing */ 
  GUI_AA_Init(xMin, xMax); 
  GUI_SetPenSize(PenSizeHR); 
  GL_DrawLine(x0 , y0 , x1 ,  y1 ); 
  GUI_AA_Exit(); 
  /* Draw end points (can be optimized away in future, TBD*/ 
  switch (OldPenShape) { 
  case GUI_PS_ROUND: 
    { 
      int r = GUI_Context.AA_Factor * PenSizeOld / 2; 
      GL_FillCircleAA_HiRes(x0 , y0 , r); 
      GL_FillCircleAA_HiRes(x1 , y1 , r); 
    } 
    break; 
  } 
  GUI_SetPenSize(PenSizeOld); 
  GUI_SetPenShape(OldPenShape); 
} 
 
/********************************************************************* 
* 
*       Public code 
* 
********************************************************************** 
*/ 
/********************************************************************* 
* 
*       GUI_AA_DrawLine 
*/ 
void GUI_AA_DrawLine(int x0, int y0, int x1, int y1) { 
  GUI_LOCK(); 
  #if (GUI_WINSUPPORT) 
    WM_ADDORG_AA(x0,y0); 
    WM_ADDORG_AA(x1,y1); 
    WM_ITERATE_START(NULL); { 
  #endif 
  _AA_DrawLine(x0, y0, x1, y1); 
  #if (GUI_WINSUPPORT) 
    } WM_ITERATE_END(); 
  #endif 
  GUI_UNLOCK(); 
} 
 
#else                            /* Avoid problems with empty object modules */ 
  void GUIAALine_C(void); 
  void GUIAALine_C(void) {} 
#endif /* GUI_SUPPORT_AA */ 
 
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