CG_opengl_hw.cpp

#include <cstdlib>
#include <cstdio>
#include <GL/freeglut.h>
#include <iostream>
#include <fstream>
#include <sstream>
#include <list>
#include <vector>

using namespace std;

typedef struct _vertex
{
	GLfloat data[3];
} vertex;

typedef struct _face
{
	int vertex1;
	int vertex2;
	int vertex3;
} face;

vector<vertex> vertexs;
vector<face> faces;

void init(){
	glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH);
	glutInitWindowSize(800,600);
	glutCreateWindow("Homework");
}

float angle = 10.0f;

void ChangeSize(int w, int h){
	glViewport(0,0,w,h);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluPerspective(10.0f , 1 , 0.0f , 500.0f);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	gluLookAt(0,0,50,
			  0,0,0,
			  0,1,0);

}

void RenderScene(){
	glClear(GL_COLOR_BUFFER_BIT);
	//glPointSize(10.0f);
	glPolygonMode(GL_FRONT_AND_BACK,GL_LINE);
	//glLineWidth(5.0f);
	glBegin(GL_TRIANGLES);
		glPointSize(3.0f);
		glColor3f(0.0,0.0,0.0);
		int i = 0;
		for(vector<face>::iterator lfit = faces.begin() ; lfit != faces.end() ; lfit++){
			glVertex3fv(vertexs[(lfit->vertex1)-1].data);
			glVertex3fv(vertexs[(lfit->vertex2)-1].data);
			glVertex3fv(vertexs[(lfit->vertex3)-1].data);
			i++;
		}
		cout << i << endl;

	glEnd();
	glutSwapBuffers();

}

void readFile(){
	fstream fin;
	string i;
	string j;
	//fin.open("C:/octahedron.obj" , ios::in);
	fin.open("C:/gourd.obj" , ios::in);
	//fin.open("C:/teapot.obj" , ios::in);
	//fin.open("C:/teddy.obj" , ios::in);
	
	
	while(getline(fin,i)){
		if(i == "")continue;
		istringstream is(i);
		is >> j;
		if(j == "#"){
		}else if(j == "g"){
		}else if(j == "v"){
			vertex newVertex;
			is >> newVertex.data[2] >> newVertex.data[1] >> newVertex.data[0];
			vertexs.push_back(newVertex);
		}else if(j == "f"){
			face newFace;
			is >> newFace.vertex1 >> newFace.vertex2 >> newFace.vertex3 ;
			faces.push_back(newFace);
		}
	}
	fin.close();
}

void SpecialKeys(int key, int x, int y){
	switch(key){
		case GLUT_KEY_UP:
			glRotatef(1.0,1,0,0);
			break;
		case GLUT_KEY_DOWN:
			glRotatef(-1.0,1,0,0);
			break;
		case GLUT_KEY_LEFT:
			glRotatef(1.0,0,0,1);
			break;
		case GLUT_KEY_RIGHT:
			glRotatef(-1.0,1,0,1);
			break;
	}
	glutPostRedisplay();
}

int main(int argc, char *argv[])
{
	readFile();
	glutInit(&argc, argv);
	init();

	glClearColor(1.0,1.0,1.0,1.0);
	glutReshapeFunc(ChangeSize);
	glutDisplayFunc(RenderScene);
	glutSpecialFunc(SpecialKeys);
	glutMainLoop();
	return 0;
}