累积弦长参数化

最新推荐文章于 2025-03-05 20:44:14 发布

wang__sid

最新推荐文章于 2025-03-05 20:44:14 发布

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分类专栏：图形学/计算机辅助几何设计文章标签： delete struct

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struct Point
{
   double m_dX;
   double m_dY;
   double m_dZ;
};

void AccluArcLenParam(const Point* pPoint, double* p, int n);

#include "stdafx.h"
#include "AccluArcLenParam.h"
#include <cmath>

double PointToPointLenght(const Point& pS, const Point& pE)
{
   return sqrtf( (pE.m_dX - pS.m_dX)*(pE.m_dX - pS.m_dX)
                 + (pE.m_dY - pS.m_dY)*(pE.m_dY - pS.m_dY) +
                   (pE.m_dZ - pS.m_dZ)*(pE.m_dZ - pS.m_dZ) );

}

void AccluArcLenParam(const Point* pPoint, double* p, int n)
{
   if ( n < 2)
   {
       return;
   }
   double dTotalLen = 0;
   double* pSingleLen = new double[n];
   pSingleLen[0] = 0.0;

   Point pS = pPoint[0];
   for ( int i = 1; i < n ; i ++)
   {
       Point pE = pPoint[i];
       double dLength = PointToPointLenght(pS, pE);
       pSingleLen[i] = dLength + dTotalLen;
       dTotalLen += dLength;

       pS = pE;
   }
   for ( int i = 0; i < n - 1; i ++)
   {
       *p++ = pSingleLen[i]/dTotalLen;
   }
   *p = 1.0; //最后一个点。

delete[] pSingleLen;
}

#include "stdafx.h"
#include "AccluArcLenParam.h"
#include <iostream>
using namespace std;

int _tmain(int argc, _TCHAR* argv[])
{
   Point point[10];
   double ratio[10];
   for ( int i = 0 ; i < 10; i++)
   {
       point[i].m_dX = i;
       point[i].m_dY = i;
       point[i].m_dZ = i;
   }
   AccluArcLenParam(point, ratio, 10);
   for ( int i = 0; i < 10; i ++)
   {
       cout << ratio[i] << ", ";
   }
   cout << endl;
   return 0;
}