基于MFC的透视投影算法实现

基于 $MFC$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 $ID$为 $ID\_Yidiantoushi$，添加事件处理程序 $OnYidiantoushi()$。

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 $View$类中声明double my_z;然后在 $OnCreate()$函数中赋值my_z = -0.4;最后再利用类向导添加消息中的 $WM\_LBUTTONDBLCLK$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: