source: OGRE/trunk/ogrenew/PlugIns/ParticleFX/src/OgreCylinderEmitter.cpp @ 692

Revision 692, 3.4 KB checked in by mattausch, 19 years ago (diff)

adding ogre 1.2 and dependencies

RevLine 
[692]1/*
2-----------------------------------------------------------------------------
3This source file is part of OGRE
4    (Object-oriented Graphics Rendering Engine)
5For the latest info, see http://www.ogre3d.org/
6
7Copyright ) 2002 Tels <http://bloodgate.com> based on EllipsoidEmitter
8Also see acknowledgements in Readme.html
9
10This program is free software; you can redistribute it and/or modify it under
11the terms of the GNU Lesser General Public License as published by the Free Software
12Foundation; either version 2 of the License, or (at your option) any later
13version.
14
15This program is distributed in the hope that it will be useful, but WITHOUT
16ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
17FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
18
19You should have received a copy of the GNU Lesser General Public License along with
20this program; if not, write to the Free Software Foundation, Inc., 59 Temple
21Place - Suite 330, Boston, MA 02111-1307, USA, or go to
22http://www.gnu.org/copyleft/lesser.txt.
23-----------------------------------------------------------------------------
24*/
25#include "OgreCylinderEmitter.h"
26#include "OgreParticle.h"
27#include "OgreQuaternion.h"
28#include "OgreException.h"
29#include "OgreStringConverter.h"
30
31
32/* Implements an Emitter whose emitting points all lie inside a cylinder.
33*/
34
35namespace Ogre {
36
37
38    //-----------------------------------------------------------------------
39    CylinderEmitter::CylinderEmitter(ParticleSystem* psys)
40        : AreaEmitter(psys)
41    {
42        initDefaults("Cylinder");
43    }
44    //-----------------------------------------------------------------------
45    void CylinderEmitter::_initParticle(Particle* pParticle)
46    {
47        Real x, y, z;
48
49        // Call superclass
50        AreaEmitter::_initParticle(pParticle);
51
52        // First we create a random point inside a bounding cylinder with a
53        // radius and height of 1 (this is easy to do). The distance of the
54        // point from 0,0,0 must be <= 1 (== 1 means on the surface and we
55        // count this as inside, too).
56
57        while (true)
58        {
59/* ClearSpace not yet implemeted
60
61*/
62                // three random values for one random point in 3D space
63                x = Math::SymmetricRandom();
64                y = Math::SymmetricRandom();
65                z = Math::SymmetricRandom();
66
67                // the distance of x,y from 0,0 is sqrt(x*x+y*y), but
68                // as usual we can omit the sqrt(), since sqrt(1) == 1 and we
69                // use the 1 as boundary. z is not taken into account, since
70                // all values in the z-direction are inside the cylinder:
71                if ( x*x + y*y <= 1)
72                {
73                        break;          // found one valid point inside
74                }
75        }       
76
77        // scale the found point to the cylinder's size and move it
78        // relatively to the center of the emitter point
79
80        pParticle->position = mPosition +
81         + x * mXRange + y * mYRange + z * mZRange;
82
83        // Generate complex data by reference
84        genEmissionColour(pParticle->colour);
85        genEmissionDirection(pParticle->direction);
86        genEmissionVelocity(pParticle->direction);
87
88        // Generate simpler data
89        pParticle->timeToLive = pParticle->totalTimeToLive = genEmissionTTL();
90       
91    }
92
93}
94
95
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