GitHub Viewer
#include
#include
GLfloat vertices[][3] = { {-1,-1,-1},{1,-1,-1},{1,1,-1},{-1,1,-1}, {-1,-1,1},{1,-1,1}, {1,1,1},{-1,1,1} };
GLfloat colors[][3] = { {1,0,0},{1,1,0},{0,1,0},{0,0,1}, {1,0,1},{1,1,1},{0,1,1},{0.5,0.5,0.5} };
void polygon(int a, int b, int c, int d)
{
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();
}
void colorcube(void)
{
polygon(0, 3, 2, 1);
polygon(0, 4, 7, 3);
polygon(5, 4, 0, 1);
polygon(2, 3, 7, 6);
polygon(1, 2, 6, 5);
polygon(4, 5, 6, 7);
}
GLfloat theta[] = { 0.0,0.0,0.0 };
GLint axis = 2;
GLdouble viewer[] = { 0.0, 0.0, 5.0 }; /* initial viewer location */
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] += 2.0;
if (theta[axis] > 360.0) theta[axis] -= 360.0; display();
}
void keys(unsigned char key, int x, int y)
{
if (key == 'x') viewer[0] -= 1.0;
if (key == 'X') viewer[0] += 1.0;
if (key == 'y') viewer[1] -= 1.0;
if (key == 'Y') viewer[1] += 1.0;
if (key == 'z') viewer[2] -= 1.0;
if (key == 'Z') viewer[2] += 1.0;
display();
}
void myReshape(int w, int h)
{
glViewport(0, 0, w, h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
if (w