/* (C) 2005 Sean Brennan. All rights reserved */ #include #include #include #include "ply2tri.h" #define ZOOMFACTOR 0.100 GLint bunlist; int button[3]; int statexy[2]; GLfloat oldxy = 0.0 , oldyz = 0.0; GLfloat lightposdef[] = {1.0, 1.0, 1.0, 0.0}; GLfloat lightposcam[] = {0.0, 0.0, 1.0, 0.0}; GLfloat lightpos[] = {1.0, 1.0, 1.0, 0.0}; GLfloat lookmatrix[16]; GLfloat orbx = 0.0, orby = 0.0, orbz = 1.0; float xzangle = 90.0, azimuth = 90.0, height=0.0, xoff=0.0, zoff=0.0 , zoom=1.0, gaspect; /* rotate model about y axis */ float incr=0.1; float incer = 0.0; GLboolean lighttoggle = GL_FALSE, flattoggle = GL_FALSE, linetoggle = GL_FALSE, axistoggle = GL_FALSE; double deg2rad(double deg) { double rad; rad = (deg / 360.0 * M_PI * 2.0); return rad; } void neworb() { GLfloat r; /* xz can wrap, azimuth cannot, unless up vec changes */ if (xzangle > 360.0) xzangle -= 360.0; if (xzangle < 0.0) xzangle += 360.0; if (azimuth > 180.0) azimuth = 180.0; if (azimuth < 0.1) azimuth = 0.1; /* r = zoom * sin(deg2rad(azimuth)); */ r = sin(deg2rad(azimuth)); if ( r < 0.0 ) r = -r; orby = zoom * cos(deg2rad(azimuth)); orbx = zoom * r * cos(deg2rad(xzangle)); orbz = zoom * r * sin(deg2rad(xzangle)); } void init(char *filename) { GLfloat whitemat[] = {1., 1., 1., 1.0}; GLfloat aquamat[] = {0.0, 1., 1., 1.0}; GLfloat shininess[] = {50.0}; /* glClearColor(0.1, 0.1, 0.1, 0.0); */ glClearColor(0.0, 0.0, 0.0, 0.0); button[0] = button[1] = button[2] = GLUT_UP; glShadeModel(GL_SMOOTH); bunlist = glGenLists(1); glNewList(bunlist, GL_COMPILE); genPlyTris(filename); glEndList(); glLightfv(GL_LIGHT0, GL_SPECULAR, whitemat); glLightfv(GL_LIGHT0, GL_DIFFUSE, whitemat); glMaterialfv(GL_FRONT, GL_SPECULAR, whitemat); glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, aquamat); glMaterialfv(GL_FRONT_AND_BACK, GL_SHININESS, shininess); glEnable(GL_DEPTH_TEST); glEnable(GL_LIGHTING); glEnable(GL_LIGHT0); neworb(); } /* draw axies of x, y and z */ void drawAxis() { glDisable(GL_LIGHTING); glPushMatrix(); /* X */ glColor3ub(0xff, 0x00, 0x00); glScalef(20.0, 0.3, 0.3); glutSolidCube(0.01); glPopMatrix(); glPushMatrix(); glTranslatef(0.1, 0.0, 0.0); glutSolidCube(0.015); glPopMatrix(); /* Y */ glColor3ub(0x00, 0xff, 0x00); glPushMatrix(); glScalef(0.3, 20.0, 0.3); glutSolidCube(0.01); glPopMatrix(); glPushMatrix(); glTranslatef(0.0, 0.1, 0.0); glutSolidCube(0.015); glPopMatrix(); /* Z */ glColor3ub(0x00, 0x00, 0xff); glPushMatrix(); glScalef(0.3, 0.3, 20.0); glutSolidCube(0.01); glPopMatrix(); glPushMatrix(); glTranslatef(0.0, 0.0, 0.1); glutSolidCube(0.015); glPopMatrix(); glEnable(GL_LIGHTING); } void display() { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glLoadIdentity(); if (lighttoggle) { /* cam light */ glLightfv(GL_LIGHT0, GL_POSITION, lightposcam); } gluLookAt(orbx, orby, orbz, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0); if (axistoggle) drawAxis(); glPushMatrix(); glTranslatef(xoff, -height, zoff); /* glRotatef(xzangle, 0.0, 1.0, 0.0); */ /* glTranslatef(0.0, height, 0.0); */ if ( ! lighttoggle) glLightfv(GL_LIGHT0, GL_POSITION, lightpos); if (linetoggle) glPolygonMode(GL_FRONT_AND_BACK, GL_LINE); else glPolygonMode(GL_FRONT_AND_BACK, GL_FILL); glCallList(bunlist); glPopMatrix(); glFlush(); glutSwapBuffers(); } void idle() { xzangle += incer; glutPostRedisplay(); } void mouse(int but, int state, int x, int y) { switch (but) { case GLUT_LEFT_BUTTON: if (state == GLUT_DOWN) { button[0] = GLUT_DOWN; } else { button[0] = GLUT_UP; } break; case GLUT_MIDDLE_BUTTON: if (state == GLUT_DOWN) { button[1] = GLUT_DOWN; } else { button[1] = GLUT_UP; } break; case GLUT_RIGHT_BUTTON: if (state == GLUT_DOWN) { button[2] = GLUT_DOWN; } else { button[2] = GLUT_UP; } break; } statexy[0] = x; statexy[1] = y; } void motion(int x, int y) { if (button[0] == GLUT_DOWN) { /* orbit left/right and up/down */ azimuth -= y - statexy[1]; xzangle += x - statexy[0]; neworb(); } if (button[1] == GLUT_DOWN) { zoom *= ( 1.0 + (GLfloat) ( y - statexy[1]) * ZOOMFACTOR); if (zoom <= 0.0) zoom = 0.1; glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(40.0, gaspect, zoom / 10.0, zoom * 100.0); glMatrixMode(GL_MODELVIEW); neworb(); } if (button[2] == GLUT_DOWN) { height += 0.05 * (GLfloat) ( y - statexy[1]) * ZOOMFACTOR * zoom; xoff += ZOOMFACTOR * zoom * sin(deg2rad(xzangle)) * 0.05 * (GLfloat) (x - statexy[0]); zoff -= ZOOMFACTOR * zoom * cos(deg2rad(xzangle)) * 0.05 *(GLfloat) (x - statexy[0]); neworb(); } statexy[0] = x; statexy[1] = y; } void reshape( int w, int h) { GLfloat xaspect, yaspect; yaspect = 1.0; xaspect = 1.0; if ( w < h) xaspect = (GLfloat) h / (GLfloat) w; else yaspect = (GLfloat) w / (GLfloat) h; glViewport(0, 0, w, h); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gaspect = (GLfloat) w / (GLfloat) h; gluPerspective(40.0, gaspect, zoom / 10.0, zoom * 100.0); glMatrixMode(GL_MODELVIEW); } void keyboard(unsigned char c, int x, int y) { switch (c) { case 27 : case 'q': case 'Q': exit(0); break; case ' ': if ( incer == 0.0 ) incer = incr; else incer = 0.0; break; case 'l': case 'L': lighttoggle = !lighttoggle; break; case 'f': case 'F': flattoggle = !flattoggle; if (flattoggle) glShadeModel(GL_FLAT); else glShadeModel(GL_SMOOTH); break; case 'W': case 'w': linetoggle = !linetoggle; break; case '-': incr -= 0.1; incer = incr; break; case '+': incr += 0.1; incer = incr; break; case 'x': case 'X': axistoggle = !axistoggle; break; case 'z': zoom *= 1.2; glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(40.0, gaspect, zoom / 10.0, zoom * 100.0); glMatrixMode(GL_MODELVIEW); break; case 'Z': zoom /= 1.2; glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(40.0, gaspect, zoom / 10.0, zoom * 100.0); glMatrixMode(GL_MODELVIEW); break; } } int main(int argc, char **argv) { glutInit(&argc, argv); glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH | GLUT_RGB); glutInitWindowSize(400, 400); glutInitWindowPosition(100, 100); glutCreateWindow(argv[0]); init(argv[1]); glutDisplayFunc(display); glutReshapeFunc(reshape); glutKeyboardFunc(keyboard); glutIdleFunc(idle); glutMouseFunc(mouse); glutMotionFunc(motion); glutMainLoop(); return(0); }