基于
$MFC$

MFC的透视投影算法实现

本文是在上一篇博客基于MFC的平行投影算法实现的基础上实现透视投影中的一点透视。

两种方法实现

一、添加事件处理程序实现

设置
$ID$

ID为
$ID_Yidiantoushi$

ID_Yidiantoushi，添加事件处理程序
$OnYidiantoushi()$

OnYidiantoushi()。

void CParallelProjectionView::OnYidiantoushi() { // TODO: 在此添加命令处理程序代码  bianhuan1[0][0] = 1, bianhuan1[0][1] = 0, bianhuan1[0][2] = 0, bianhuan1[0][3] = 0;  bianhuan1[1][0] = 0, bianhuan1[1][1] = 1, bianhuan1[1][2] = 0, bianhuan1[1][3] = 0;  bianhuan1[2][0] = 0, bianhuan1[2][1] = 0, bianhuan1[2][2] = 0, bianhuan1[2][3] = -0.4;  bianhuan1[3][0] = 0.8, bianhuan1[3][1] = -1.6, bianhuan1[3][2] = 0, bianhuan1[3][3] = 1.8; matx_N4(lifang, bianhuan1, jieguo); mydraw(); } 

实现效果：

二、利用系统响应函数实现

首先在
$View$

View类中声明double my_z;然后在
$OnCreate()$

OnCreate()函数中赋值my_z = -0.4;最后再利用类向导添加消息中的
$WM_LBUTTONDBLCLK$

WM_LBUTTONDBLCLK处理函数。实现双击鼠标左键来改变投影中心离投影面的距离。

void CParallelProjectionView::OnLButtonDblClk(UINT nFlags, CPoint point) { // TODO: 在此添加消息处理程序代码和/或调用默认值 if (my_z >= -0.6) {   my_z += 0.05; if (my_z >= -0.0)    my_z = -0.6; } RedrawWindow(); //一点透视变换矩阵  bianhuan1[0][0] = 1, bianhuan1[0][1] = 0, bianhuan1[0][2] = 0,bianhuan1[0][3] = 0;  bianhuan1[1][0] = 0, bianhuan1[1][1] = 1, bianhuan1[1][2] = 0, bianhuan1[1][3] = 0;  bianhuan1[2][0] = 0, bianhuan1[2][1] = 0, bianhuan1[2][2] = 0, bianhuan1[2][3] = my_z;  bianhuan1[3][0] = 0.8, bianhuan1[3][1] = -1.6, bianhuan1[3][2] = 0, bianhuan1[3][3] = 1.8; matx_N4(lifang, bianhuan1, jieguo); mydraw();  CView::OnLButtonDblClk(nFlags, point); } 

实现效果: