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1 | /************************************************************************
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2 |
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3 | MxCamera
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4 |
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5 | Copyright (C) 1998 Michael Garland. See "COPYING.txt" for details.
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6 |
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7 | $Id: MxCamera.cxx,v 1.1 2002/09/24 16:53:54 wimmer Exp $
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8 |
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9 | ************************************************************************/
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10 |
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11 | #include "stdmix.h"
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12 | #include "MxCamera.h"
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13 |
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14 |
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15 |
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16 | void MxCamera::look_at(const MxBounds& bounds, double ratio)
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17 | {
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18 | double d = 3*bounds.radius / tan(60*M_PI/180.0);
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19 |
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20 | at = bounds.center;
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21 | from = at;
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22 |
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23 | from[Z] += d;
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24 |
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25 | up[X] = 0; up[Y] = 1; up[Z] = 0;
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26 |
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27 | fovy = 60.0;
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28 | aspect = ratio;
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29 |
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30 | znear = d/20;
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31 | zfar = 10*d;
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32 | }
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33 |
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34 | void MxCamera::apply()
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35 | {
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36 | gluPerspective(fovy, aspect, znear, zfar);
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37 | gluLookAt(from[X], from[Y], from[Z],
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38 | at[X], at[Y], at[Z],
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39 | up[X], up[Y], up[Z]);
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40 | }
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41 |
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42 | void MxCamera::apply(GLenum mode)
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43 | {
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44 | GLint last_mode; glGetIntegerv(GL_MATRIX_MODE, &last_mode);
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45 | glMatrixMode(mode);
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46 | apply();
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47 | glMatrixMode((GLenum)last_mode);
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48 | }
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