22333

#include "stdafx.h"
#include <glut.h>

int flag=0;
//GLfloat vertices[][3]={{-1.0,-1.0,1.0},{-1.0,1.0,1.0},{1.0,1.0,1.0},{1.0,-1.0,1.0},{-1.0,-1.0,-1.0},
//{-1.0,1.0,-1.0},{1.0,1.0,-1.0},{1.0,-1.0,-1.0}};
GLfloat vertices[][3]={{-1.0,-1.0,-1.0},{1.0,-1.0,-1.0},{1.0,1.0,-1.0},{-1.0,1.0,-1.0},{-1.0,-1.0,1.0},{1.0,-1.0,1.0},{1.0,1.0,1.0},{-1.0,1.0,1.0}};
GLfloat colors[][3]={{1.0,0.0,0.0},{0.0,1.0,1.0},{1.0,1.0,0.0},{0.0,1.0,0.0},{0.0,0.0,1.0}, {1.0,0.0,1.0},{0.0,1.0,1.0},{1.0,1.0,1.0}};

static GLfloat theta[]={0.0,0.0,0.0};
static GLint axis=2;

void reshape(int w,int h);
void init();
void display();
void mouse(int btn,int state,int x,int y);
void polygon(int a,int b,int c,int d);
void colorcube(void);
void spinCube();

int APIENTRY
	_tWinMain(HINSTANCE hInstance,
	HINSTANCE hPrevInstance,
	LPTSTR lpCmdLine,
	int nCmdShow)
{
	UNREFERENCED_PARAMETER(hPrevInstance);
	UNREFERENCED_PARAMETER(lpCmdLine);
	char *argv[] = {"hello ", " "};
	int argc = 2; // must/should match the number of strings in argv
	glutInit(&argc, argv); //初始化GLUT库；
	glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB|GLUT_DEPTH);
	glutInitWindowSize(800, 800);
	glutCreateWindow("colorcube"); //创建窗口，标题为“…”；
	init();
	glutReshapeFunc(reshape);
	glutDisplayFunc(display); //用于绘制当前窗口；
	glutIdleFunc(spinCube);
	glutMouseFunc(mouse);
	glutMainLoop(); //表示开始运行程序，用于程序的结尾；
	return 0;
}
void display()
{
	glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
	glLoadIdentity();
	gluLookAt(3,3,3,0,0,0,0,1,0);
	glRotatef(theta[0],1.0,0.0,0.0);
	glRotatef(theta[1],0.0,1.0,0.0);
	glRotatef(theta[2],0.0,0.0,1.0);
	glPolygonMode(GL_FRONT_AND_BACK,GL_FILL);
	flag=0;
	colorcube(); //绘制彩色立方体
	glPolygonMode(GL_FRONT_AND_BACK,GL_LINE);
	flag=1;
	colorcube(); //绘制彩色立方体
	glutSwapBuffers();
}
void init()
{
	glPolygonMode(GL_FRONT_AND_BACK,GL_FILL);
	glEnable(GL_DEPTH_TEST);
	glLineWidth(3);
}
void polygon(int a,int b,int c,int d)
{ /* draw a polygon via list of vertices */

	if (flag==0) {
		glBegin(GL_POLYGON);
		glColor3fv(colors[a]);
		glVertex3fv(vertices[a]);
		glColor3fv(colors[b]);
		glVertex3fv(vertices[b]);
		glColor3fv(colors[c]);
		glVertex3fv(vertices[c]);
		glColor3fv(colors[d]);
		glVertex3fv(vertices[d]);
		glEnd();
	}
	else
	{
		glColor3f(0,0,0);
		glBegin(GL_POLYGON);
		glVertex3fv(vertices[a]);
		glVertex3fv(vertices[b]);
		glVertex3fv(vertices[c]);
		glVertex3fv(vertices[d]);
		glEnd();
	}
}
void colorcube(void)
{ /* map vertices to faces */
  polygon(0,3,2,1);
  polygon(2,3,7,6);
  polygon(0,4,7,3);
  polygon(1,2,6,5);
  polygon(4,5,6,7);
  polygon(0,1,5,4);
 }
void mouse(int btn, int state,int x, int y)
{
	if (btn==GLUT_LEFT_BUTTON && state==GLUT_DOWN) axis=0;
	if (btn==GLUT_MIDDLE_BUTTON && state==GLUT_DOWN) axis=1;
	if (btn==GLUT_RIGHT_BUTTON && state==GLUT_DOWN) axis=2;
}
void reshape(int w,int h)
{
	glViewport(0,0,w,h);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	//定义正交投影观察体
	if (w<=h)
		glOrtho(-2.0,2.0,-2.0*(GLfloat)h/(GLfloat)w,2.0*(GLfloat)h/(GLfloat)w,1.0,20.0);
	else
		glOrtho(-2.0*(GLfloat)w/(GLfloat)h,2.0*(GLfloat)w/(GLfloat)h,-2.0,2.0,1.0,20.0);
	// gluPerspective(120,w/h,1,60);//定义透视投影投影观察体
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
}
void spinCube()
{
	theta[axis]+=0.1;
	if (theta[axis]>360.0) theta[axis]-=360.0;
	glutPostRedisplay();
}