guipolye.c

MCB2300_ucgui_LCD320240.rar LPC2368的uc/gui的移植

/*
*********************************************************************************************************
*   											 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.c
Purpose 	: Polygon enlarge
----------------------------------------------------------------------
*/

#include <math.h>
#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; 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;
  }
}

#else

void 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

/*************************** End of file ****************************/