progs/samples/line.c

/*
 * Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc.
 *
 * Permission to use, copy, modify, distribute, and sell this software and
 * its documentation for any purpose is hereby granted without fee, provided
 * that (i) the above copyright notices and this permission notice appear in
 * all copies of the software and related documentation, and (ii) the name of
 * Silicon Graphics may not be used in any advertising or
 * publicity relating to the software without the specific, prior written
 * permission of Silicon Graphics.
 *
 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF
 * ANY KIND,
 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
 *
 * IN NO EVENT SHALL SILICON GRAPHICS BE LIABLE FOR
 * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
 * OF THIS SOFTWARE.
 */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <GL/glut.h>


#define CI_OFFSET 16


GLenum rgb, doubleBuffer, windType;

GLenum mode1, mode2;
GLint size;
float pntA[3] = {
    -160.0, 0.0, 0.0
};
float pntB[3] = {
    -130.0, 0.0, 0.0
};
float pntC[3] = {
    -40.0, -50.0, 0.0
};
float pntD[3] = {
    30.0, 60.0, 0.0
};


#include "tkmap.c"

static void Init(void)
{
    GLint i;

    glClearColor(0.0, 0.0, 0.0, 0.0);

    glLineStipple(1, 0xF0E0);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE);

    if (!rgb) {
	for (i = 0; i < 16; i++) {
	    glutSetColor(i+CI_OFFSET, i/15.0, i/15.0, 0.0);
	}
    }

    mode1 = GL_FALSE;
    mode2 = GL_FALSE;
    size = 1;
}

static void Reshape(int width, int height)
{

    glViewport(0, 0, (GLint)width, (GLint)height);

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluOrtho2D(-175, 175, -175, 175);
    glMatrixMode(GL_MODELVIEW);
}

static void Key(unsigned char key, int x, int y)
{

    switch (key) {
      case 27:
	exit(1);
      case '1':
	mode1 = !mode1;
	break;
      case '2':
	mode2 = !mode2;
	break;
      case 'W':
	size++;
	break;
      case 'w':
	size--;
	if (size < 1) {
	    size = 1;
	}
	break;
      default:
	return;
    }

    glutPostRedisplay();
}

static void Draw(void)
{
    GLint ci, i;

    glClear(GL_COLOR_BUFFER_BIT);

    glLineWidth(size);

    if (mode1) {
	glEnable(GL_LINE_STIPPLE);
    } else {
	glDisable(GL_LINE_STIPPLE);
    }
    
    if (mode2) {
	ci = CI_OFFSET;
	glEnable(GL_LINE_SMOOTH);
	glEnable(GL_BLEND);
    } else {
	ci = COLOR_YELLOW;
	glDisable(GL_LINE_SMOOTH);
	glDisable(GL_BLEND);
    }

    glPushMatrix();

    glShadeModel( GL_FLAT );

    for (i = 0; i < 360; i += 5) {
	glRotatef(5.0, 0,0,1);

	(rgb) ? glColor3f(1.0, 1.0, 0.0) : glIndexi(ci);
	glBegin(GL_LINE_STRIP);
	    glVertex3fv(pntA);
	    glVertex3fv(pntB);
	glEnd();

	glPointSize(1);

	SetColor(COLOR_GREEN);
	glBegin(GL_POINTS);
	    glVertex3fv(pntA);
	    glVertex3fv(pntB);
	glEnd();
    }

    glPopMatrix();

    glFlush();

    if (doubleBuffer) {
	glutSwapBuffers();
    }
}

static GLenum Args(int argc, char **argv)
{
    GLint i;

    rgb = GL_TRUE;
    doubleBuffer = GL_FALSE;

    for (i = 1; i < argc; i++) {
	if (strcmp(argv[i], "-ci") == 0) {
	    rgb = GL_FALSE;
	} else if (strcmp(argv[i], "-rgb") == 0) {
	    rgb = GL_TRUE;
	} else if (strcmp(argv[i], "-sb") == 0) {
	    doubleBuffer = GL_FALSE;
	} else if (strcmp(argv[i], "-db") == 0) {
	    doubleBuffer = GL_TRUE;
	} else {
	    printf("%s (Bad option).\n", argv[i]);
	    return GL_FALSE;
	}
    }
    return GL_TRUE;
}

int main(int argc, char **argv)
{
    glutInit(&argc, argv);

    if (Args(argc, argv) == GL_FALSE) {
	exit(1);
    }

    glutInitWindowPosition(0, 0); glutInitWindowSize( 300, 300);

    windType = (rgb) ? GLUT_RGB : GLUT_INDEX;
    windType |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
    glutInitDisplayMode(windType);

    if (glutCreateWindow("Line Test") == GL_FALSE) {
	exit(1);
    }

    InitMap();

    Init();

    glutReshapeFunc(Reshape);
    glutKeyboardFunc(Key);
    glutDisplayFunc(Draw);
    glutMainLoop();
	return 0;
}