122 lines
2.7 KiB
C++
122 lines
2.7 KiB
C++
|
#include "GL/glut.h"
|
||
|
|
|
||
|
|
|
||
|
|
volatile unsigned long long int timer_ticks = 0;
|
||
|
|
|
||
|
|
/// Displays a square based pyramid from a base position, height and side length
|
||
|
|
/// \param x X coordinate of the center
|
||
|
|
/// \param y Y coordinate of the center
|
||
|
|
/// \param z Z coordinate of the center
|
||
|
|
/// \param c Side length of the square
|
||
|
|
/// \param h Height of the pyramid
|
||
|
|
void display_pyramid(float x, float y, float z, float c, float h)
|
||
|
|
{
|
||
|
|
glBegin(GL_TRIANGLES);
|
||
|
|
|
||
|
|
// First side
|
||
|
|
glColor3f(1,0,0);
|
||
|
|
|
||
|
|
// Summit
|
||
|
|
glVertex3f(x,y+h,z);
|
||
|
|
glVertex3f(x+c/2,y,z+c/2);
|
||
|
|
glVertex3f(x-c/2,y,z+c/2);
|
||
|
|
|
||
|
|
// Second side
|
||
|
|
glColor3f(0,1,0);
|
||
|
|
|
||
|
|
glVertex3f(x,y+h,z);
|
||
|
|
glVertex3f(x+c/2,y,z+c/2);
|
||
|
|
glVertex3f(x+c/2,y,z-c/2);
|
||
|
|
|
||
|
|
// Third side
|
||
|
|
glColor3f(0,0,1);
|
||
|
|
|
||
|
|
glVertex3f(x,y+h,z);
|
||
|
|
glVertex3f(x-c/2,y,z+c/2);
|
||
|
|
glVertex3f(x-c/2,y,z-c/2);
|
||
|
|
|
||
|
|
// Fourth side
|
||
|
|
glColor3f(1,1,0);
|
||
|
|
|
||
|
|
glVertex3f(x,y+h,z);
|
||
|
|
glVertex3f(x-c/2,y,z-c/2);
|
||
|
|
glVertex3f(x+c/2,y,z-c/2);
|
||
|
|
|
||
|
|
glEnd();
|
||
|
|
// Bottom
|
||
|
|
glBegin(GL_QUADS);
|
||
|
|
|
||
|
|
glColor3f(0,1,1);
|
||
|
|
glVertex3f(x-c/2,y,z-c/2);
|
||
|
|
glVertex3f(x-c/2,y,z+c/2);
|
||
|
|
glVertex3f(x+c/2,y,z+c/2);
|
||
|
|
glVertex3f(x+c/2,y,z-c/2);
|
||
|
|
|
||
|
|
glEnd();
|
||
|
|
}
|
||
|
|
|
||
|
|
/// Draw a pyramid rotated around its axis
|
||
|
|
void display_rotating_pyramid(float x, float y, float z, float c, float h, float alpha)
|
||
|
|
{
|
||
|
|
glPushMatrix();
|
||
|
|
glTranslatef(x,0,z);
|
||
|
|
glRotatef(alpha,0,1,0);
|
||
|
|
glTranslatef(-x,0,-z);
|
||
|
|
display_pyramid(x,y,z,c,h);
|
||
|
|
glPopMatrix();
|
||
|
|
}
|
||
|
|
|
||
|
|
void display()
|
||
|
|
{
|
||
|
|
float angleY = 1*timer_ticks;
|
||
|
|
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
|
||
|
|
|
||
|
|
glMatrixMode(GL_PROJECTION);
|
||
|
|
// Prepare view
|
||
|
|
glLoadIdentity();
|
||
|
|
gluPerspective(60,(double)glutGet(GLUT_WINDOW_WIDTH)/(double)glutGet(GLUT_WINDOW_HEIGHT),10,30000);
|
||
|
|
|
||
|
|
glMatrixMode(GL_MODELVIEW);
|
||
|
|
glLoadIdentity();
|
||
|
|
gluLookAt(10, 10, 10,
|
||
|
|
0, 0, 1,
|
||
|
|
0, 1, 0);
|
||
|
|
|
||
|
|
|
||
|
|
display_rotating_pyramid(0,-2,0,2,4,angleY);
|
||
|
|
display_rotating_pyramid(3,-2,0,1,5,angleY);
|
||
|
|
display_rotating_pyramid(-2,-2,4,3,2,angleY);
|
||
|
|
|
||
|
|
glutSwapBuffers();
|
||
|
|
}
|
||
|
|
|
||
|
|
void update_angle(int value)
|
||
|
|
{
|
||
|
|
timer_ticks++;
|
||
|
|
glutTimerFunc(50,update_angle,0);
|
||
|
|
}
|
||
|
|
|
||
|
|
int main(int argc, char** argv)
|
||
|
|
{
|
||
|
|
glutInit(&argc,argv);
|
||
|
|
// Generate window with GLUT
|
||
|
|
glutInitDisplayMode(GLUT_RGB| GLUT_DEPTH | GLUT_DOUBLE);
|
||
|
|
glutCreateWindow("Hello");
|
||
|
|
|
||
|
|
// Init OpenGL
|
||
|
|
glClearColor(0,0,0,1);
|
||
|
|
glClearDepth(1.0);
|
||
|
|
// glEnable(GL_LIGHTING);
|
||
|
|
// glEnable(GL_LIGHT0);
|
||
|
|
glEnable(GL_DEPTH_TEST);
|
||
|
|
|
||
|
|
glViewport(0,0,glutGet(GLUT_WINDOW_WIDTH),glutGet(GLUT_WINDOW_HEIGHT));
|
||
|
|
|
||
|
|
glutIdleFunc(display);
|
||
|
|
glutTimerFunc(50,update_angle,0);
|
||
|
|
|
||
|
|
// Enters main loop, managed by GLUT
|
||
|
|
glutMainLoop();
|
||
|
|
return 0;
|
||
|
|
}
|