www.pudn.com > UCGUI390a.rar > GUIPolyE.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        : GUIPolyE.c 
Purpose     : Polygon enlarge 
---------------------------------------------------------------------- 
*/ 
 
#include  
#include "GUI.h" 
#include "GUIDebug.h" 
 
/********************************************************************* 
* 
*       Types 
* 
********************************************************************** 
*/ 
 
typedef struct { 
  float x, y; 
} tfPoint; 
 
/********************************************************************* 
* 
*       Static code 
* 
********************************************************************** 
*/ 
/********************************************************************* 
* 
*       _fround 
*/ 
static int _fround(float f) { 
  if (f>0) 
    return f+0.5; 
  return f-0.5; 
} 
 
/********************************************************************* 
* 
*       _Normalize 
*/ 
static void _Normalize(tfPoint* pfPoint) { 
  float fx = pfPoint->x; 
  float fy = pfPoint->y; 
  float r = sqrt(fx*fx + fy*fy); 
  if (r > 0) { 
    pfPoint->x = fx/r; 
    pfPoint->y = fy/r; 
  } 
} 
 
/********************************************************************* 
* 
*       _ReverseLen 
*/ 
static void _ReverseLen(tfPoint* pfPoint) { 
  float fx = pfPoint->x; 
  float fy = pfPoint->y; 
  float r = sqrt(fx*fx/2 + fy*fy/2); 
  if (r > 0) { 
    pfPoint->x = fx/r/r; 
    pfPoint->y = fy/r/r; 
  } 
} 
 
/********************************************************************* 
* 
*       _GetVect 
*/ 
static void _GetVect(tfPoint* pfPoint, const GUI_POINT* pSrc, int NumPoints, int Index) { 
  int Off0 = (Index + NumPoints-1) % NumPoints; 
  int Off1 = Index % NumPoints; 
  pfPoint->x = pSrc[Off1].x - pSrc[Off0].x;  
  pfPoint->y = pSrc[Off1].y - pSrc[Off0].y;  
} 
 
/********************************************************************* 
* 
*       Public code 
* 
********************************************************************** 
*/ 
/********************************************************************* 
* 
*       GUI_EnlargePolygon 
*/ 
#if 0 
void GUI_EnlargePolygon(GUI_POINT* pDest, const GUI_POINT* pSrc, int NumPoints, int Len) { 
  int j; 
  /* Calc destination points */ 
  for (j=0; jx = (pSrc+j)->x + x; 
    (pDest+j)->y = (pSrc+j)->y + y; 
  } 
} 
 
#else 
 
void GUI_EnlargePolygon(GUI_POINT* pDest, const GUI_POINT* pSrc, int NumPoints, int Len) { 
  int j; 
  /* Calc destination points */ 
  for (j=0; jx = (pSrc+j)->x + x; 
    (pDest+j)->y = (pSrc+j)->y + y; 
  } 
} 
#endif 
 
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