144 lines
4.3 KiB
C
144 lines
4.3 KiB
C
/*
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* (c) Copyright 1993, Silicon Graphics, Inc.
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* ALL RIGHTS RESERVED
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* Permission to use, copy, modify, and distribute this software for
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* any purpose and without fee is hereby granted, provided that the above
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* copyright notice appear in all copies and that both the copyright notice
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* and this permission notice appear in supporting documentation, and that
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* the name of Silicon Graphics, Inc. not be used in advertising
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* or publicity pertaining to distribution of the software without specific,
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* written prior permission.
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*
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* THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
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* AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
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* FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
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* GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
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* SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
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* KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
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* LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
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* THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN
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* ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
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* POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* US Government Users Restricted Rights
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* Use, duplication, or disclosure by the Government is subject to
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* restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
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* (c)(1)(ii) of the Rights in Technical Data and Computer Software
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* clause at DFARS 252.227-7013 and/or in similar or successor
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* clauses in the FAR or the DOD or NASA FAR Supplement.
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* Unpublished-- rights reserved under the copyright laws of the
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* United States. Contractor/manufacturer is Silicon Graphics,
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* Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311.
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*
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* OpenGL(TM) is a trademark of Silicon Graphics, Inc.
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*/
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/*
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* pickline.c
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* Picking is demonstrated here. Press the left mouse button
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* is enter picking mode. You get two hits if you press the
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* mouse, while the cursor is where the lines intersect.
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*/
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#include <windows.h>
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#include <stdio.h>
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#include <GL/gl.h>
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#include <GL/glu.h>
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#include "glaux.h"
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void drawLine(GLenum mode)
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{
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if (mode == GL_SELECT)
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glLoadName (1);
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glBegin (GL_LINES);
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glColor3f (1.0, 1.0, 1.0);
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glVertex3f (30.0, 30.0, 0.0);
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glVertex3f (50.0, 60.0, 0.0);
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glEnd ();
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if (mode == GL_SELECT)
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glLoadName (2);
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glBegin (GL_LINES);
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glColor3f (1.0, 1.0, 1.0);
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glVertex3f (50.0, 60.0, 0.0);
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glVertex3f (70.0, 40.0, 0.0);
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glEnd ();
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}
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/* pickline() is called when the mouse is pressed.
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* The projection matrix is reloaded to include the
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* picking matrix. The line is "redrawn" during
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* selection mode, and names are sent to the buffer.
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*/
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#define BUFSIZE 512
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void pickLine(AUX_EVENTREC *event)
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{
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GLuint selectBuf[BUFSIZE];
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GLint hits;
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GLint viewport[4];
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int x, y;
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x = event->data[AUX_MOUSEX];
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y = event->data[AUX_MOUSEY];
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glGetIntegerv (GL_VIEWPORT, viewport);
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glSelectBuffer (BUFSIZE, selectBuf);
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(void) glRenderMode (GL_SELECT);
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glInitNames();
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glPushName(-1);
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glMatrixMode (GL_PROJECTION);
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glPushMatrix ();
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glLoadIdentity ();
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gluPickMatrix ((GLdouble) x, (GLdouble) (viewport[3] - y),
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5.0, 5.0, viewport);
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gluOrtho2D (0.0, (GLdouble) viewport[2],
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0.0, (GLdouble) viewport[3]);
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drawLine (GL_SELECT);
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glPopMatrix ();
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glFlush ();
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hits = glRenderMode (GL_RENDER);
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printf ("hits is %d\n", hits);
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}
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void myinit (void)
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{
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glShadeModel (GL_FLAT);
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glClearColor (0.0, 0.0, 0.0, 0.0);
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}
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void display(void)
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{
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glClear(GL_COLOR_BUFFER_BIT);
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drawLine (GL_RENDER);
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glFlush();
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}
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void myReshape(GLsizei w, GLsizei h)
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{
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glViewport(0, 0, w, h);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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gluOrtho2D (0.0, (GLdouble) w, 0.0, (GLdouble) h);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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}
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/* Main Loop
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* Open window with initial window size, title bar,
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* RGBA display mode, and handle input events.
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*/
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int main(int argc, char** argv)
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{
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auxInitDisplayMode (AUX_SINGLE | AUX_RGB);
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auxInitPosition (0, 0, 100, 100);
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auxInitWindow (argv[0]);
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myinit ();
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auxMouseFunc (AUX_LEFTBUTTON, AUX_MOUSEDOWN, pickLine);
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auxReshapeFunc (myReshape);
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auxMainLoop(display);
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}
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