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3d bezier curve by lew26
# include "glut.h" # include <iostream> # include <list> using namespace std; //################################################################## class vertex { private: GLdouble x; GLdouble y; GLint delta; public: vertex () { x = 0.0; y = 0.0; delta = 5; }; vertex (const vertex & v) { x = v.x; y = v.y; delta = v.delta; } void operator= (const vertex & v) { x = v.x; y = v.y; delta = v.delta; } bool nearvertex (GLint xscreen, GLint yscreen) { if ((xscreen >= x - delta) && (xscreen <= x + delta) && (yscreen >= y - delta) && (yscreen <= y + delta)) return true; else return false; } void set (GLdouble x, GLdouble y) { this->x = x; this->y = y; } void update (GLdouble dy) { y += dy; } void print () { cout << "(x,y)=( " << x << " , " << y << " )" << endl; } GLdouble getx () { return x; } GLdouble gety () { return y; } }; //################################################################## GLuint xsize, ysize; GLint d = 5; GLdouble dt = 0.001; // added for 3d GLfloat rotz = 0.0f; // Rotation about the Z axis GLfloat rotx = 0.0f; GLfloat roty = 0.0f; GLfloat rota = 0.0f; list < vertex > points; list < vertex >::iterator iter; list < vertex >::iterator move; bool found = false; GLint max_order; // maximale Anzahl an Punkten pro Kurve //################################################################## void main_display () { GLdouble t; GLdouble *plist; GLint i; plist = new GLdouble[3 * points.size ()]; for (iter = points.begin (), i = 0; iter != points.end (); iter++, i++) { plist[3 * i] = iter->getx (); plist[3 * i + 1] = iter->gety (); plist[3 * i + 2] = 0.0; } glLoadIdentity (); glClear (GL_COLOR_BUFFER_BIT); // for 3d support glLoadIdentity(); glTranslatef(0.0f, 0.0f, 0.0f); glRotatef(0.0f, 0.0f, 0.0f, 1.0f); glRotatef(rota,rotx,roty,rotz; glBegin (GL_QUADS); glColor3d (1.0, 0.0, 0.0); for (iter = points.begin (); iter != points.end (); iter++) { if ((found) && (iter == move)) glColor3d (0.0, 1.0, 0.0); else glColor3d (1.0, 0.0, 0.0); glVertex2d (iter->getx () - d, iter->gety () + d); glVertex2d (iter->getx () - d, iter->gety () - d); glVertex2d (iter->getx () + d, iter->gety () - d); glVertex2d (iter->getx () + d, iter->gety () + d); } glEnd (); if (points.size () > 1) { glColor3f (1.0, 0.0, 0.0); glMap1d (GL_MAP1_VERTEX_3, 0.0, 1.0, 3, points.size (), plist); /* */ glEnable (GL_MAP1_VERTEX_3); glBegin (GL_LINE_STRIP); for (t = 0.0; t < 1.0; t += dt) { glColor3f (0.5, 0.5 * t, t); glEvalCoord1d (t); } glEnd (); } glutSwapBuffers (); delete plist; } //################################################################## void main_reshape (GLint w, GLint h) { GLint dy = h - ysize; GLint dx = w - xsize; for (iter = points.begin (); iter != points.end (); iter++) { iter->update ((GLdouble) dy); } glMatrixMode (GL_PROJECTION); glLoadIdentity (); glOrtho (0, xsize, 0, ysize, -1000, 1000); glTranslatef(1.0f,1.0f,1.0f); glMatrixMode (GL_MODELVIEW); /*glLoadIdentity();*/ xsize = w; ysize = h; } //################################################################## void main_key (unsigned char key, GLint x, GLint y) { switch (key) { case 'r': case 'R': points.clear (); break; case 'd': if (found) { points.erase (move); found = false; } break; } glutPostRedisplay (); } //################################################################## void spec_Key (GLint key, GLint x, GLint y) { switch (key) { case GLUT_KEY_LEFT: // Left directional key. rota -= 5.8f; roty = 1.0f; rotx = 1.0f; break; case GLUT_KEY_RIGHT: // Up directional key. rota += 5.8f; roty = 1.0f; rotx = 1.0f; break; case GLUT_KEY_UP: // Right directional key. rota += 5.8f; rotx = 1.0f; roty = 1.0f; break; case GLUT_KEY_DOWN: // Down directional rota -= 5.8f; rotx = 1.0f; roty = 1.0f; break; } // switch glutPostRedisplay (); } // spec_Key //################################################################## void main_mouse (GLint button, GLint state, GLint x, GLint y) { vertex v; // if right mouse button down display point at coordinates if ((button == GLUT_RIGHT_BUTTON) && (state == GLUT_DOWN) && (points.size () < max_order)) { v.set ((GLdouble) x, (GLdouble) ysize - y); points.push_back (v); } // if left mouse button down display point at coordinates if ((button == GLUT_LEFT_BUTTON) && (state == GLUT_DOWN)) { found = false; for (move = points.begin (); move != points.end (); move++) { if (move->nearvertex ((GLint) x, (GLint) ysize - y)) { dt = 0.1; found = true; break; } } } if ((button == GLUT_LEFT_BUTTON) && (state == GLUT_UP)) { found = false; dt = 0.001; } glutPostRedisplay (); } //################################################################## void main_mousemove (GLint x, GLint y) { if (found) { move->set ((GLdouble) x, (GLdouble) ysize - y); } glutPostRedisplay (); } //#################################################################### int main (int argc, char **argv) { using namespace std; xsize = ysize = 1000; glutInitDisplayMode (GLUT_RGB | GLUT_DOUBLE); glClearColor (0.0, 0.0, 0.0, 1.0); glutInitWindowSize (xsize, ysize); glutInit (&argc, argv); glutCreateWindow (argv[0]); glutDisplayFunc (main_display); glutReshapeFunc (main_reshape); glutKeyboardFunc (main_key); // ansi keys glutSpecialFunc (spec_Key); // special keys glutMouseFunc (main_mouse); glutMotionFunc (main_mousemove); /*glMatrixMode (GL_PROJECTION); glLoadIdentity (); gluOrtho2D (0, xsize, ysize, 0.0); glMatrixMode (GL_MODELVIEW);*/ glGetIntegerv (GL_MAX_EVAL_ORDER, &max_order); glutMainLoop (); return 0; }
