Phonesackda / ProjectGL

#include <stdlib.h> #include <stdio.h> #include <math.h> #ifdef __APPLE__ #include <GLUT/glut.h> #else #include <GL/glut.h> #endif #define ROT_INC 0.1 /* forward declare the default drawing function */ void drawSphere(void); /* * local static variables: g_rotate used to keep track of global rotation * g_rotInc is the rotation increment each frame * */ static GLfloat g_rotate = 0; static GLfloat g_rotInc = ROT_INC; /* degree increment for rotation animation */ /* function pointer to a function called by display to draw the geometry */ static void (*drawPrimP)(void) = drawSphere; /* * basic geometry drawing functions - just wrappers to the glut * wire drawing functions */ void drawSphere(void) { glutWireSphere(6.0,20,20); } void drawCube(void) { glutWireCube(6.0); } void drawCone(void) { glutWireCone(6.0, 8.0, 10, 20); } void drawTorus(void) { glutWireTorus(1.0, 6.0, 10, 20); } void drawIcos(void) { glPushMatrix(); glScalef(6.0,6.0,6.0); glutWireIcosahedron(); glPopMatrix(); } void drawTeapot(void) { glutWireTeapot(6.0); } /* * setPrim * * callback, called by the GLUT when the user selects a menu option. * This function currently contains "magic numbers" in that the menu numbers * and their functions are hard coded. A better option would be to use macros * or have a data structure that relates menu number, name and function... */ void setPrim(int value) { switch(value) { case 1: drawPrimP = drawSphere; break; case 2: drawPrimP = drawCube; break; case 3: drawPrimP = drawCone; break; case 4: drawPrimP = drawTorus; break; case 5: drawPrimP = drawIcos; break; case 6: drawPrimP = drawTeapot; break; default: fprintf(stderr, "3dPrim: unknown menu option %d\n", value); break; } } /* * display * * This function is called by the GLUT to display the graphics * */ void display(void) { glClear( GL_COLOR_BUFFER_BIT ); /* set matrix mode to modelview */ glMatrixMode(GL_MODELVIEW); /* save matrix */ glPushMatrix(); /* global rotation */ glRotatef(g_rotate,1.0,1.0,1.0); /* draw the geometry */ (*drawPrimP)(); /* restore matrix */ glPopMatrix(); /* swap buffers to display the frame */ glutSwapBuffers(); } /* * myReshape * * This function is called whenever the user (or OS) reshapes the * OpenGL window. The GLUT sends the new window dimensions (x,y) * */ void myReshape(int w, int h) { /* set viewport to new width and height */ /* note that this command does not change the CTM */ glViewport(0, 0, w, h); /* * set viewing window using perspective projection */ glMatrixMode(GL_PROJECTION); glLoadIdentity(); /* init projection matrix */ /* perspective parameters: field of view, aspect, near clip, far clip */ gluPerspective( 60.0, (GLdouble)w/(GLdouble)h, 0.1, 40.0); /* set matrix mode to modelview */ glMatrixMode(GL_MODELVIEW); glLoadIdentity(); gluLookAt(0.0, 0.0, 20.0, /* eye at (0,0,20) */ 0.0, 0.0, 0.0, /* lookat point */ 0.0, 1.0, 0.0); /* up is in +ive y */ } /* * myKey * * responds to key presses from the user */ void myKey(unsigned char k, int x, int y) { switch (k) { case 'q': case 'Q': exit(0); break; default: printf("Unknown keyboard command \'%c\'.\n", k); break; } } /* * myMouse * * function called by the GLUT when the user presses a mouse button * * Here we increment the global rotation rate with each press - left to do a * positive increment, right for negative, middle to reset */ void myMouse(int btn, int state, int x, int y) { if(btn==GLUT_LEFT_BUTTON && state == GLUT_DOWN) g_rotInc += ROT_INC; if(btn==GLUT_MIDDLE_BUTTON && state == GLUT_DOWN) g_rotInc = ROT_INC; /* if(btn==GLUT_RIGHT_BUTTON && state == GLUT_DOWN) g_rotInc -= ROT_INC; */ /* force redisplay */ glutPostRedisplay(); } /* * myIdleFunc * * increments the rotation variable within glutMainLoop */ void myIdleFunc(void) { g_rotate += g_rotInc; /* force glut to call the display function */ glutPostRedisplay(); } /* * main * * Initialization and sets graphics callbacks * */ int main(int argc, char **argv) { /* glutInit MUST be called before any other GLUT/OpenGL calls */ glutInit(&argc, argv); glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE); glutInitWindowSize(500, 500); glutCreateWindow("3D Shapes Test"); glutReshapeFunc(myReshape); glutDisplayFunc(display); glutIdleFunc(myIdleFunc); glutKeyboardFunc(myKey); glutMouseFunc(myMouse); glutCreateMenu(setPrim); glutAddMenuEntry("Sphere", 1); glutAddMenuEntry("Cube", 2); glutAddMenuEntry("Cone", 3); glutAddMenuEntry("Torus", 4); glutAddMenuEntry("Icosahedron", 5); glutAddMenuEntry("Teapot", 6); glutAttachMenu(GLUT_RIGHT_BUTTON); glClearColor(1.0, 1.0, 1.0, 1.0); glColor3f(0.0, 0.0, 0.0); glutMainLoop(); return 0; }