/***********************************************************************************************************                                                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        : GUI_DrawPolyline.cPurpose     : Implementation of GUI_DrawPolyline (part of emWin GSC)---------------------------END-OF-HEADER------------------------------*/#include <stddef.h>           /* needed for definition of NULL */#include "GUI_Protected.H"static void _DrawGraph(I16 *pay, int NumPoints, int xOff, int yOff) {  int i;  int y0, y1;  int yClip0, yClip1;  /* Perform high level clipping in x */  yClip0 = GUI_Context.pClipRect_HL->y0;  yClip1 = GUI_Context.pClipRect_HL->y1;  i=0;  if (GUI_Context.pClipRect_HL) {    if (xOff < GUI_Context.pClipRect_HL->x0)      i = GUI_Context.pClipRect_HL->x0 - xOff;    if (xOff+NumPoints-1 > GUI_Context.pClipRect_HL->x1)      NumPoints = GUI_Context.pClipRect_HL->x1 - xOff + 1;  }  /* Start drawing if there is something left to do after x-clipping */  if (i < NumPoints) {    y0 = *(pay + i++) + yOff;    /* Iterate */    for (; i < NumPoints; i++) {      /* Perform high level clipping in y */      y1 = *(pay + i) + yOff;      if ((y0 >= yClip0) | (y1 >= yClip0)) {        if ((y0 <= yClip1) | (y1 <= yClip1)) {          int y01;          y01 = (y1 + y0) / 2;          if (y0 <= y1) {            LCD_DrawVLine(i + xOff - 1, y0, y01);            LCD_DrawVLine(i + xOff, y01, y1);          } else {            LCD_DrawVLine(i + xOff - 1, y01, y0);            LCD_DrawVLine(i + xOff, y1, y01);          }        }      }      y0 = y1;    }  }}  void GUI_DrawGraph(I16 *pay, int NumPoints, int x0, int y0) {  GUI_LOCK();  #if (GUI_WINSUPPORT)    WM_ADDORG(x0,y0);    WM_ITERATE_START(NULL); {  #endif  _DrawGraph(pay, NumPoints, x0, y0);  #if (GUI_WINSUPPORT)    } WM_ITERATE_END();  #endif  GUI_UNLOCK();}