/***********************************************************************************************************                                                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        : GUIPolyE.cPurpose     : Polygon enlarge----------------------------------------------------------------------*/#include <math.h>#include "GUI.H"#include "GUIDebug.H"typedef struct {  float x,y;} tfPoint;static int fround ( float f) {  if (f>0)    return f+0.5;  return f-0.5;}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;  }}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;  }}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; }/*********************************************************************                  GUI_EnlargePolygon**********************************************************************/#if 0void GUI_EnlargePolygon(GUI_POINT* pDest, const GUI_POINT* pSrc, int NumPoints, int Len) {  int j;  /* Calc destination points */  for (j=0; j<NumPoints; j++) {    int x, y;    tfPoint aVect[2];    /* Get the vectors */    GetVect(&aVect[0], pSrc, NumPoints, j);    GetVect(&aVect[1], pSrc, NumPoints, j+1);    /* Normalize the vectors and add vectors */    Normalize(&aVect[0]);    Normalize(&aVect[1]);    aVect[0].x += aVect[1].x;    aVect[0].y += aVect[1].y;    /* Resulting vector needs to be normalized again */    Normalize(&aVect[0]);    x =  fround(aVect[0].y * Len);    y = -fround(aVect[0].x * Len);    /* Store destination */    (pDest+j)->x = (pSrc+j)->x + x;    (pDest+j)->y = (pSrc+j)->y + y;  }}#elsevoid GUI_EnlargePolygon(GUI_POINT* pDest, const GUI_POINT* pSrc, int NumPoints, int Len) {  int j;  /* Calc destination points */  for (j=0; j<NumPoints; j++) {    int x, y;    tfPoint aVect[2];    /* Get the vectors */    GetVect(&aVect[0], pSrc, NumPoints, j);    GetVect(&aVect[1], pSrc, NumPoints, j+1);    /* Normalize the vectors and add vectors */    Normalize(&aVect[0]);    Normalize(&aVect[1]);    aVect[0].x += aVect[1].x;    aVect[0].y += aVect[1].y;    /* Resulting vector needs to be normalized again */    ReverseLen(&aVect[0]);    x =  fround(aVect[0].y * Len);    y = -fround(aVect[0].x * Len);    /* Store destination */    (pDest+j)->x = (pSrc+j)->x + x;    (pDest+j)->y = (pSrc+j)->y + y;  }}#endif