| /* |
| * 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_RED COLOR_RED |
| #define CI_ANTI_ALIAS_GREEN 16 |
| #define CI_ANTI_ALIAS_YELLOW 32 |
| #define CI_ANTI_ALIAS_RED 48 |
| |
| |
| GLenum rgb, doubleBuffer, windType; |
| GLint windW, windH; |
| |
| #include "tkmap.c" |
| |
| GLenum mode; |
| GLint size; |
| float point[3] = { |
| 1.0, 1.0, 0.0 |
| }; |
| |
| |
| static void Init(void) |
| { |
| GLint i; |
| |
| glClearColor(0.0, 0.0, 0.0, 0.0); |
| |
| glBlendFunc(GL_SRC_ALPHA, GL_ZERO); |
| |
| if (!rgb) { |
| for (i = 0; i < 16; i++) { |
| glutSetColor(i+CI_ANTI_ALIAS_RED, i/15.0, 0.0, 0.0); |
| glutSetColor(i+CI_ANTI_ALIAS_YELLOW, i/15.0, i/15.0, 0.0); |
| glutSetColor(i+CI_ANTI_ALIAS_GREEN, 0.0, i/15.0, 0.0); |
| } |
| } |
| |
| mode = GL_FALSE; |
| size = 1; |
| } |
| |
| static void Reshape(int width, int height) |
| { |
| |
| windW = (GLint)width; |
| windH = (GLint)height; |
| |
| glViewport(0, 0, width, height); |
| |
| glMatrixMode(GL_PROJECTION); |
| glLoadIdentity(); |
| gluOrtho2D(-windW/2, windW/2, -windH/2, windH/2); |
| glMatrixMode(GL_MODELVIEW); |
| } |
| |
| static void Key2(int key, int x, int y) |
| { |
| |
| switch (key) { |
| case GLUT_KEY_LEFT: |
| point[0] -= 0.25; |
| break; |
| case GLUT_KEY_RIGHT: |
| point[0] += 0.25; |
| break; |
| case GLUT_KEY_UP: |
| point[1] += 0.25; |
| break; |
| case GLUT_KEY_DOWN: |
| point[1] -= 0.25; |
| break; |
| default: |
| return; |
| } |
| |
| glutPostRedisplay(); |
| } |
| |
| static void Key(unsigned char key, int x, int y) |
| { |
| |
| switch (key) { |
| case 27: |
| exit(1); |
| case '1': |
| mode = !mode; |
| break; |
| case 'W': |
| size++; |
| break; |
| case 'w': |
| size--; |
| if (size < 1) { |
| size = 1; |
| } |
| break; |
| default: |
| return; |
| } |
| |
| glutPostRedisplay(); |
| } |
| |
| static void Draw(void) |
| { |
| |
| glClear(GL_COLOR_BUFFER_BIT); |
| |
| SetColor(COLOR_YELLOW); |
| glBegin(GL_LINE_STRIP); |
| glVertex2f(-windW/2, 0); |
| glVertex2f(windW/2, 0); |
| glEnd(); |
| glBegin(GL_LINE_STRIP); |
| glVertex2f(0, -windH/2); |
| glVertex2f(0, windH/2); |
| glEnd(); |
| |
| if (mode) { |
| glEnable(GL_BLEND); |
| glEnable(GL_POINT_SMOOTH); |
| } else { |
| glDisable(GL_BLEND); |
| glDisable(GL_POINT_SMOOTH); |
| } |
| |
| glPointSize(size); |
| if (mode) { |
| (rgb) ? glColor3f(1.0, 0.0, 0.0) : glIndexf(CI_ANTI_ALIAS_RED); |
| } else { |
| (rgb) ? glColor3f(1.0, 0.0, 0.0) : glIndexf(CI_RED); |
| } |
| glBegin(GL_POINTS); |
| glVertex3fv(point); |
| glEnd(); |
| |
| glDisable(GL_POINT_SMOOTH); |
| glDisable(GL_BLEND); |
| |
| glPointSize(1); |
| SetColor(COLOR_GREEN); |
| glBegin(GL_POINTS); |
| glVertex3fv(point); |
| glEnd(); |
| |
| 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); |
| } |
| |
| windW = 300; |
| windH = 300; |
| glutInitWindowPosition(0, 0); glutInitWindowSize( windW, windH); |
| |
| windType = (rgb) ? GLUT_RGB : GLUT_INDEX; |
| windType |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE; |
| glutInitDisplayMode(windType); |
| |
| if (glutCreateWindow("Point Test") == GL_FALSE) { |
| exit(1); |
| } |
| |
| InitMap(); |
| |
| Init(); |
| |
| glutReshapeFunc(Reshape); |
| glutKeyboardFunc(Key); |
| glutSpecialFunc(Key2); |
| glutDisplayFunc(Draw); |
| glutMainLoop(); |
| return 0; |
| } |