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-rw-r--r--kscreensaver/kdesavers/firesaverparticle.cpp273
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diff --git a/kscreensaver/kdesavers/firesaverparticle.cpp b/kscreensaver/kdesavers/firesaverparticle.cpp
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--- a/kscreensaver/kdesavers/firesaverparticle.cpp
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-// This file is part of KFireSaver3D.
-
-// KFireSaver3D is free software; you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation; either version 2 of the License, or
-// (at your option) any later version.
-
-// KFireSaver3D is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU General Public License for more details.
-
-// You should have received a copy of the GNU General Public License
-// along with KFireSaver3D; if not, write to the Free Software
-// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
-
-
-// Author: Enrico Ros, based on the great work of David Sansome (kfiresaver)
-// Email: asy@libero.it
-
-#include <math.h>
-#include <stdlib.h>
-
-#include "firesaverparticle.h"
-#include "firesaver.h"
-
-//current color scheme : red orng grn blue w m c
-static const GLfloat c_red_min[7] = { 0.4, 0.9, 0, 0, 1, 0, 0 };
-static const GLfloat c_red_max[7] = { 1, 1, 0, 0, 1, 1, 0 };
-static const GLfloat c_green_min[7] = { 0, 0.4, 0.4, 0, 1, 0, 0 };
-static const GLfloat c_green_max[7] = { 0, 0.5, 1, 0.5, 1, 0, 1 };
-static const GLfloat c_blue_min[7] = { 0, 0.1, 0, 0.5, 1, 0, 0 };
-static const GLfloat c_blue_max[7] = { 0, 0.2, 0, 1, 1, 1, 1 };
-
-
-//default initialization (good for Leader / Fire)
-Particle :: Particle( ParticleType pT )
- : particleType( pT ), explosionsDepth( 0 ), texture( 0 ),
- xpos( 0.0 ), ypos( 0.0 ), zpos( -9.9 ),
- xspeed( 0.0 ), yspeed( 0.0 ), zspeed( 0.0 ), zacc( -9.807 ),
- life( 0.0 ), startLife( 0.0 ),
- pixelSize( 5.0 ), useLife( true ), flicker( 0 )
-{
- colour[0] = 0;
- colour[1] = 0;
- colour[2] = 0;
- colour[3] = 1;
-}
-
-
-void Particle :: initializeValues (
- int cs,
- Particle* debrisParent,
- GLfloat powermin, GLfloat powermax,
- bool flickers,
- GLfloat *displace )
-//note: this function is called when a particle needs a set of default parameters.
-// these depends on the ParticleType.
-{
- switch (particleType)
- {
-// -- FireParticle (params: [cs])
-// born in a rectangle centered in { 0, 0, -9.9 }
-// speed 3-6 [m/s] blue/cyan colored
-// this is only done at the beginning or when a particle dies
- case FireParticle:
- xpos = DRAND * FIELDWIDTH - FIELDW_2;
- ypos = DRAND - 2.0;
-
- xspeed = DRAND * 4.0 - 2.0;
- yspeed = DRAND * 2.0;
- zspeed = DRAND * 3.0 + 3.0;
-
- useLife = false;
- pixelSize = 2.0 + DRAND * 2.0;
- break;
-
-// -- FireWorkLeaderParticle (params: none)
-// they start in a rectangle at the same height but
-// with different power and the same 'orange' colour
- case FireWorkLeaderParticle:
- xpos = DRAND * 14.0 - 7.0;
- ypos = DRAND * 2.0 - 1.0;
-
- xspeed = DRAND * 8.0 - 4.0 - (xpos / 2.0)*DRAND;
- yspeed = DRAND * 8.0 - 4.0;
- zspeed = DRAND * 6.5 + 18.0;
-
- colour[0] = 0.6;
- colour[1] = DRAND * 0.4;
- colour[2] = 0.0;
-
- useLife = false;
- break;
-
-// -- LogoParticle (params: none)
-// they start in the middle of the screen.
-// little g-force, constant life, weavy-y
- case LogoParticle:
- yspeed = 3*(DRAND - DRAND);
- zacc = -9.807f / 5.0f;
-
- startLife = 0.7f;
- life = 1.7f;
- break;
-
-// -- StarParticle (params: none)
-// spherically distributed. xpos and ypos are the
-// transformed screen positions of the star.
- case StarParticle:
- colour[0] = DRAND * 0.2 + 0.5;
- colour[1] = DRAND * 0.2 + 0.5;
- colour[2] = DRAND * 0.2 + 0.5;
-
- {bool accepted = false;
- while (!accepted) {
- float module = 30,
- theta = DRAND * M_PI * 2.0,
- u = DRAND * 2.0 - 1.0,
- root = sqrt( 1 - u*u );
- xpos = module * root * cos(theta);
- ypos = fabs(module * root * sin(theta)) - 10.0;
- zpos = fabs(module * u);
-
- float sfactor = 256.0 / (256.0 + PERSP_MAG_FACTOR*ypos);
- xpos *= sfactor;
- ypos = sfactor * zpos - FIELDW_2;
-
- pixelSize = sfactor * (2.0 + 3.0*DRAND);
-
- accepted = xpos > -FIELDW_2 && xpos < FIELDW_2 &&
- ypos > -FIELDW_2 && ypos < FIELDW_2;
- }}
- break;
-
-// -- FireWorkDebrisParticle (params: cs, parent, [powerm], [powerM], [flickers], [displace])
-// parameters are randomized for a 'spherical' explosion.
-// power{min,max}, flickers and displace applies only for that
-// kind of ParticleType.
- case FireWorkDebrisParticle:
-
- //same origin of the dead leader
- xpos = debrisParent->xpos;
- ypos = debrisParent->ypos;
- zpos = debrisParent->zpos;
-
- //true spherical randomization
- float module = powermin + DRAND * (powermax - powermin),
- theta = DRAND * M_PI * 2.0,
- u = DRAND * 2.0 - 1.0,
- root = sqrt( 1 - u*u );
- xspeed = debrisParent->xspeed + module * root * cos(theta) * (1.0 + DRAND/3.0);
- yspeed = debrisParent->yspeed + module * root * sin(theta) * (1.0 + DRAND/3.0);
- zspeed = module * u * (1.0 + DRAND/3.0); //was 0.9 + DRAND/3
-
- //if set add a displace to speed
- if ( displace ) {
- xspeed += displace[0];
- yspeed += displace[1];
- zspeed += displace[2];
- }
-
- //randomize the color choosing on current palette
- colour[0] = c_red_min[cs] + (c_red_max[cs]-c_red_min[cs]) * DRAND;
- colour[1] = c_green_min[cs] + (c_green_max[cs]-c_green_min[cs]) * DRAND;
- colour[2] = c_blue_min[cs] + (c_blue_max[cs]-c_blue_min[cs]) * DRAND;
-
- pixelSize = DRAND * 2.0 + 2.0;
- zacc = -9.807 / (6.0 - pixelSize);
-
- life = startLife = pixelSize / 2.0;
-
- //if flickers is set the current visible delay is randomized
- if ( flickers )
- flicker = (int) ((DRAND * 2.0 - 1.0) * (float)FLICKER_FRAMES_DELAY);
- break;
- }
-}
-
-
-void Particle :: updateParameters( float dT )
-//note: this procedure uses a reduced set of parameters
-// x and y axis acceleration is no more used
-// the only external iterations are:
-// - the g force
-// - a sort of air friction that limits speed in x,y and
-// acceleration on z
-{
- xpos += xspeed * dT;
- ypos += yspeed * dT;
- zpos += (zspeed + zacc*dT/2) * dT;
-
- zspeed += zacc * dT;
-
- xspeed *= 0.998;
- yspeed *= 0.998;
- zspeed *= 0.999;
-
- if (useLife)
- life -= dT;
-}
-
-
-// BEGIN TurningParticle class
-
-TurningParticle :: TurningParticle( ParticleType pT )
- : Particle( pT ) {}
-
-void TurningParticle :: initializeValues (
- int cs,
- Particle* leader,
- GLfloat powermin,
- GLfloat powermax,
- bool /*flickers*/,
- GLfloat * /*displace*/ )
-{
- //same origin of the parent
- xpos = leader->xpos;
- ypos = leader->ypos;
- zpos = leader->zpos;
-
- //velocity : true spherical randomization
- float module = powermin + (powermax - powermin) * DRAND * 0.6,
- theta = DRAND * M_PI * 2.0,
- u = DRAND * 2.0 - 1.0,
- root = sqrt( 1 - u*u );
- xspeed = -module * root * cos(theta);
- yspeed = -module * root * sin(theta);
- zspeed = module * u;
-
- //spin axis : in quadrature with velocity
- module = (1 + DRAND) / 40;
- u = DRAND * 2.0 - 1.0;
- root = sqrt( 1 - u*u );
- // axis to spin around
- wx = module * root * cos(theta + M_PI_2);
- wy = module * root * sin(theta + M_PI_2);
- wz = module * u;
-
- //randomize the color choosing on current palette
- colour[0] = c_red_min[cs] + (c_red_max[cs]-c_red_min[cs]) * DRAND;
- colour[1] = c_green_min[cs] + (c_green_max[cs]-c_green_min[cs]) * DRAND;
- colour[2] = c_blue_min[cs] + (c_blue_max[cs]-c_blue_min[cs]) * DRAND;
-
- pixelSize = DRAND * 2.0 + 2.0;
- zacc = -9.807 / 5.0;
- life = startLife = pixelSize / 2.0;
-}
-
-
-void TurningParticle :: updateParameters ( float dT )
-{
- //update position
- xpos += xspeed * dT;
- ypos += yspeed * dT;
- zpos += zspeed * dT;
-
- //tan vector = velocity vector (vect producted by) spin axis
- float vx = yspeed * wz - zspeed * wy,
- vy = zspeed * wx - xspeed * wz,
- vz = xspeed * wy - yspeed * wx;
-
- //update velocity adding a tangential component (aka infinitesimally
- //rotating the vector)
- xspeed += vx;
- yspeed += vy;
- zspeed += vz + zacc * dT;
-
- if (useLife)
- life -= dT;
-}
-
-//END TurningParticle
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