root/samples/redbook/lines.php

DEFINITIONS

1. drawOneline
2. init
3. display
4. reshape

<?php

function drawOneline($x1, $y1, $x2, $y2) {
    glBegin(GL_LINES);
    glVertex2f($x1, $y1);
    glVertex2f($x2, $y2);
    glEnd();
}

function init() {
    glClearColor(0.0, 0.0, 0.0, 0.0);
    glShadeModel(GL_FLAT);
}

function display() {
    glClear(GL_COLOR_BUFFER_BIT);
    glColor3f(1.0, 1.0, 1.0);

    glEnable(GL_LINE_STIPPLE);

    glLineStipple(1, 0x0101);
    drawOneLine(50.0, 125.0, 150.0, 125.0);
    glLineStipple(1, 0x00FF);
    drawOneLine(150.0, 125.0, 250.0, 125.0);
    glLineStipple(1, 0x1C47);
    drawOneLine(250.0, 125.0, 350.0, 125.0);

    glLineWidth(5.0);
    glLineStipple(1, 0x0101);
    drawOneLine(50.0, 100.0, 150.0, 100.0);
    glLineStipple(1, 0x00FF);
    drawOneLine(150.0, 100.0, 250.0, 100.0);
    glLineStipple(1, 0x1C47);
    drawOneLine(250.0, 100.0, 350.0, 100.0);
    glLineWidth(1.0);

    glLineStipple(1, 0x1C47);
    glBegin(GL_LINE_STRIP);
    for ($i = 0 ; $i < 7 ; $i++) {
        glVertex2f(50.0 + $i * 50.0, 75.0);
    }
    glEnd();

    for ($i = 0 ; $i < 6 ; $i++) {
        drawOneLine(50.0 + $i * 50.0, 50.0,
                    50.0 + ($i+1)*50.0, 50.0);
    }

    glLineStipple(5, 0x1C47);
    drawOneLine(50.0, 25.0, 350.0, 25.0);

    glDisable(GL_LINE_STIPPLE);
    glFlush();
}

function reshape($w, $h) {
    glViewport(0, 0, $w, $h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluOrtho2D(0.0, $w, 0.0, $h);
}

// main

glutInit($argv);
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
glutInitWindowSize(400, 150);
glutInitWindowPosition(100, 100);
glutCreateWindow($argv[0]);
init();
glutDisplayFunc('display');
glutReshapeFunc('reshape');
glutMainLoop();