Initial revision

progs/samples/point.c

@@ -0,0 +1,234 @@
+/*
+ * 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;
+}