forked from modbender/VTU-15CSL68
/
p4.c
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/
p4.c
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#include <stdlib.h>
#include <GL/glut.h>
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}
}, normals[][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}
},colors[][3] = {
{0.0,0.0,0.0},{1.0,0.0,0.0},
{1.0,1.0,0.0},{0.0,1.0,0.0},{0.0,0.0,1.0},
{1.0,0.0,1.0},{1.0,1.0,1.0},{0.0,1.0,1.0}
};
GLfloat rotateValue = 8.0, changeValue = 1.0;
void polygon(int a,int b,int c, int d){
glBegin(GL_POLYGON);
glColor3fv(colors[a]);
glNormal3fv(normals[a]);
glVertex3fv(vertices[a]);
glColor3fv(colors[b]);
glNormal3fv(normals[b]);
glVertex3fv(vertices[b]);
glColor3fv(colors[c]);
glNormal3fv(normals[c]);
glVertex3fv(vertices[c]);
glColor3fv(colors[d]);
glNormal3fv(normals[d]);
glVertex3fv(vertices[d]);
glEnd();
}
void colorCube(void){
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);
}
static GLfloat theta[] = {0.0,0.0,0.0};
static GLint axis = 2;
static GLdouble viewer[] = {0.0,0.0,5.0};
void display(void){
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
gluLookAt(viewer[0],viewer[1],viewer[2],0.0,0.0,0.0,0.0,1.0,0.0);
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);
colorCube();
glFlush();
glutSwapBuffers();
}
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;
theta[axis]+=rotateValue;
if(theta[axis]>360.0) theta[axis]-=360.0;
display();
}
void keys(unsigned char key,int x,int y){
if(key == 'x') viewer[0]-=changeValue;
if(key == 'X') viewer[0]+=changeValue;
if(key == 'y') viewer[1]-=changeValue;
if(key == 'Y') viewer[1]+=changeValue;
if(key == 'z') viewer[2]-=changeValue;
if(key == 'Z') viewer[2]+=changeValue;
glutPostRedisplay();
}
void myReshape(int w,int h){
glViewport(0,0,w,h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
if(w<=h){
glFrustum(-2.0,2.0,-2.0*(GLfloat)h/(GLfloat)w,2.0*(GLfloat)h/(GLfloat)w,2.0,20.0);
}
else{
glFrustum(-2.0,2.0,-2.0*(GLfloat)w/(GLfloat)h,2.0*(GLfloat)w/(GLfloat)h,2.0,20.0);
}
glMatrixMode(GL_MODELVIEW);
}
int main(int argc,char **argv){
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB|GLUT_DEPTH);
glutInitWindowSize(500,500);
glutCreateWindow("Rotating color cube");
glutReshapeFunc(myReshape);
glutDisplayFunc(display);
glutMouseFunc(mouse);
glutKeyboardFunc(keys);
glEnable(GL_DEPTH_TEST);
glutMainLoop();
return 0;
}