/* tiling2.cpp * This program demonstrates how to flip an image upside down * by simply flip the window upside down. * The data file is "dino.dat". * Click the right button to exit. */ #include << X11/Xlib.h> #include << fstream.h> #include << math.h> #include << GL/glut.h> #include << GL/gl.h> #include << stdlib.h> #include << stdio.h> const int screenWidth = 640; const int screenHeight = 480; // setWindow void setWindow(GLdouble left, GLdouble right, GLdouble bottom, GLdouble top) { glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluOrtho2D(left, right, bottom, top); } // setViewport void setViewport(int left, int right, int bottom, int top) { //glViewport(left, bottom, right - left, top - bottom); glViewport(left, bottom, right - left, bottom - top ); } void myInit(void) { glClearColor (1.0, 1.0, 1.0, 0.0); // set black background color glColor3f (0.0f, 0.0f, 0.0f); // set the drawing color glPointSize (2.0); // set dot size 2 x 2 } void drawPolylineFile(char *fileName) { int i,j; // fstream inStream; // inStream.open(fileName, ios::in); // open the file // if (inStream.fail()) // return; ifstream inStream(fileName); GLint numpolys, numLines, x, y; inStream >> numpolys; // read the number of polylines for (j = 0; j < numpolys; j++) { inStream >> numLines; glBegin(GL_LINE_STRIP); // draw the next polyline for (i = 0; i < numLines; i++) { inStream >> x >> y; // read the next x, y pair glVertex2i (x, y); } glEnd(); } glFlush (); // send all out to display // inStream.close(); } void myDisplay(void) { glClear(GL_COLOR_BUFFER_BIT); // clear the screen setWindow(0.0, 640.0, 0.0, 480.0); // set the window for (int i=0; i < 10; i++) for (int j=0; j < 11; j++) { if ((i+j)%2 ==0) setWindow(0.0, 640.0, 0.0, 440.0); else setWindow(0.0, 640.0, 440.0, 0.0); setViewport(i*64, i*64 + 64, j*44, j*44 + 44); drawPolylineFile("dino.dat"); } } void myMouse(int button, int state, int x, int y) { switch (button) { case GLUT_RIGHT_BUTTON: if (state == GLUT_DOWN) exit (-1); break; default: break; } } int main(int argc, char** argv) { glutInit(&argc, argv); // initialize the toolkit glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB); // set display mode glutInitWindowSize (screenWidth, screenHeight); // set screen window size glutInitWindowPosition (100, 150); // set window position on screen glutCreateWindow (argv[0]); // open the screen window myInit (); glutDisplayFunc(myDisplay); // register redraw function glutMouseFunc(myMouse); // register myMouse function glutMainLoop(); // go into a perpetual loop return 0; }