5g_3dmmani.cpp

visual c++ 实例编程

// 5G_3DMMani.cpp: implementation of the C5G_3DMMani class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "..\Edit3DM.h"
#include "5G_3DMMani.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

C5G_3DMMani::C5G_3DMMani()
{
	m_xmax = 1.0f;
	m_xmin = -1.0f;
	m_ymax = 1.0f;
	m_ymin = -1.0f;
	m_zmax = 1.0f;
	m_zmin = -1.0f;
	m_centerx = 0.0f;
	m_centery = 0.0f;
	m_centerz = 0.0f;
}

C5G_3DMMani::~C5G_3DMMani()
{
}

void C5G_3DMMani::DrawBound(int viewtype)
{
	float dx = m_xmax - m_xmin;
	float dy = m_ymax - m_ymin;
	float dz = m_zmax - m_zmin;

	//with green color, to draw the scene bound
	glColor3f(0.0f, 1.0f, 0.0f);
	glBegin(GL_LINE_STRIP);
		switch(viewtype)
		{
		case 0:		//FRONT
			{
				glVertex3f(-dx * 0.5f, dz * 0.5f, 0.0f);
				glVertex3f(dx * 0.5f, dz * 0.5f, 0.0f);
				glVertex3f(dx * 0.5f, -dz * 0.5f, 0.0f);
				glVertex3f(-dx * 0.5f, -dz * 0.5f, 0.0f);
				glVertex3f(-dx * 0.5f, dz * 0.5f, 0.0f);
			}
			break;
		case 1:		//SIDE
			{
				glVertex3f(-dx * 0.5f, dy * 0.5f, 0.0f);
				glVertex3f(dx * 0.5f, dy * 0.5f, 0.0f);
				glVertex3f(dx * 0.5f, -dy * 0.5f, 0.0f);
				glVertex3f(-dx * 0.5f, -dy * 0.5f, 0.0f);
				glVertex3f(-dx * 0.5f, dy * 0.5f, 0.0f);
			}
			break;
		case 2:
			{
				glVertex3f(-dy * 0.5f, dz * 0.5f, 0.0f);
				glVertex3f(dy * 0.5f, dz * 0.5f, 0.0f);
				glVertex3f(dy * 0.5f, -dz * 0.5f, 0.0f);
				glVertex3f(-dy * 0.5f, -dz * 0.5f, 0.0f);
				glVertex3f(-dy * 0.5f, dz * 0.5f, 0.0f);
			}
			break;
		default:
			break;
		}
	glEnd();
}

void C5G_3DMMani::SetProjection(int viewtype, int viewmode)
{
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();

	switch(viewtype)
	{
	case 0:		//FRONT
		{
			if(viewmode == 0)
			{
				glOrtho(-GetDx() * 0.6f, GetDx() * 0.6f,
						-GetDz() * 0.6f, GetDz() * 0.6f,
						0.0f, GetDy() * 1.2f);
			}
			if(viewmode == 1)
			{
			}
		}
		break;
	case 1:		//TOP
		{
			if(viewmode == 0)
			{
				glOrtho(-GetDx() * 0.6f, GetDx() * 0.6f,
						-GetDy() * 0.6f, GetDy() * 0.6f,
						0.0f, GetDz() * 1.2f);
			}
			if(viewmode == 1)
			{
			}
		}
		break;
	case 2:
		{
			if(viewmode == 0)
			{
				glOrtho(-GetDy() * 0.6f, GetDy() * 0.6f,
						-GetDz() * 0.6f, GetDz() * 0.6f,
						0.0f, GetDx() * 1.2f);
			}
			if(viewmode == 1)
			{
			}
		}
		break;
	default:
		break;
	}

	glMatrixMode(GL_MODELVIEW);
}