计算机图形学作业 Hermite曲线
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2Hermite曲线
double H0(double t)
{
TRACE(_T("H0=%.4f\n"),2*t*t*t-3*t*t+1);
return 2*t*t*t-3*t*t+1;
}
double H1(double t)
{
TRACE(_T("H1=%.4f\n"),-2*t*t*t+3*t*t);
return -2*t*t*t+3*t*t;
}
double H2(double t)
{
TRACE(_T("H2=%.4f\n"),t*t*t-2*t*t+t);
return t*t*t-2*t*t+t;
}
double H3(double t)
{
TRACE(_T("H3=%.4f\n"),t*t*t-t*t);
return t*t*t-t*t;
}
void drawHermite(CPoint p1,CPoint p2,CPoint r1,CPoint r2,CDC *pDC) {
double xt,yt;
//double xo,yo;
double t;
t=0.0;
TRACE(_T("t=%.4f\n"),t);
xt=p1.x*H0(t)+p2.x*H1(t)+r1.x*H2(t)+r2.x*H3(t);
yt=p1.y*H0(t)+p2.y*H1(t)+r1.y*H2(t)+r2.y*H3(t);
pDC->MoveTo(int(xt+0.5),int(yt+0.5));
for(t=0.1;t<=1.0;t=t+0.1)
{
TRACE(_T("t=%.4f\n"),t);
xt=p1.x*H0(t)+p2.x*H1(t)+r1.x*H2(t)+r2.x*H3(t);
yt=p1.y*H0(t)+p2.y*H1(t)+r1.y*H2(t)+r2.y*H3(t);
pDC->LineTo(int(xt+0.5),int(yt+0.5));
}//for(t=0.1;t<=1.0;t=t+0.1)
}
void Chermite_quxianView::OnLButtonDown(UINT nFlags, CPoint point)
{
// TODO: 在此添加消息处理程序代码和/或调用默认值
m_pnts[m_pntCount]=point;
m_pntCount++;
CPoint r1,r2;
r1.x=100;
r1.y=100;
r2.x=100;
r2.y=-100;
if(m_pntCount>1)
{
CDC *pDC=GetDC();
//draw Hermite
//pDC->MoveTo(m_pnts[m_pntCount-2]);
//pDC->LineTo(m_pnts[m_pntCount-1]);
drawHermite(m_pnts[m_pntCount-2],m_pnts[m_pntCount-1],r1,r2,pDC);
ReleaseDC(pDC);
}
CView::OnLButtonDown(nFlags, point);
}