source: orxonox.OLD/branches/atmospheric_engine/src/lib/graphics/effects/snow_effect.cc @ 7685

/*
        orxonox - the future of 3D-vertical-scrollers

        Copyright (C) 2004 orx

        This program 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, or (at your option)
        any later version.

### File Specific:
        main-programmer: hdavid, amaechler
*/

#include "snow_effect.h"

#include "util/loading/load_param.h"
#include "util/loading/factory.h"

#include "glincl.h"
#include "debug.h"

#include "p_node.h"
#include "state.h"
#include "sprite_particles.h"
#include "plane_emitter.h"
#include "shell_command.h"

#include "parser/tinyxml/tinyxml.h"

SHELL_COMMAND(activate, SnowEffect, activateSnow);
SHELL_COMMAND(deactivate, SnowEffect, deactivateSnow);

using namespace std;

CREATE_FACTORY(SnowEffect, CL_SNOW_EFFECT);

SnowEffect::SnowEffect(const TiXmlElement* root)
{
        this->setClassID(CL_SNOW_EFFECT, "SnowEffect");

        this->init();

        if (root != NULL)
                this->loadParams(root);

        this->activate();
}


SnowEffect::~SnowEffect()
{
        this->deactivate();
}

SpriteParticles* SnowEffect::snowParticles = NULL;

void SnowEffect::loadParams(const TiXmlElement* root)
{
        WeatherEffect::loadParams(root);

        LoadParam(root, "numParticles", this, SnowEffect, numParticles);
        LoadParam(root, "materialTexture", this, SnowEffect, materialTexture);
        LoadParam(root, "lifeSpans", this, SnowEffect, lifeSpan);
        LoadParam(root, "radius", this, SnowEffect, radius);
        LoadParam(root, "mass", this, SnowEffect, mass);
        LoadParam(root, "emissionRate", this, SnowEffect, emissionRate);
        LoadParam(root, "emissionVelocity", this, SnowEffect, emissionVelocity);
  LoadParam(root, "wind", this, SnowEffect, wind);
        LoadParam(root, "size", this, SnowEffect, size);
        LoadParam(root, "coord", this, SnowEffect, coord);
}

bool SnowEffect::init()
{
        this->emitter = new PlaneEmitter();

        // Default values
        particles = 12000;
        texture = "maps/snow_flake_01_32x32.png";
        life = 8;
        randomLife = 2;
        snowRadius = 3.5;
        randomRadius = 1;
        snowMass = 1.0;
        randomMass = 0.3;
        rate = 900;
        velocity = -100;
        randomVelocity = 5;
        angle = 0.5;
        randomAngle = 0.2;
        alpha = 0.5;
        snowSize = Vector2D(2500, 2500);
  snowCoord = Vector(100,450,400);

        activated = false;
}

bool SnowEffect::activate()
{
        PRINTF(0)("Activating SnowEffect\n");
        activated = true;

        SnowEffect::snowParticles = new SpriteParticles(particles);
        SnowEffect::snowParticles->setName("SnowEffectTrailParticles");
        SnowEffect::snowParticles->setMaterialTexture(texture);
        SnowEffect::snowParticles->setLifeSpan(life, randomLife);
        SnowEffect::snowParticles->setRadius(0.0, snowRadius, randomRadius);
        SnowEffect::snowParticles->setRadius(0.2, snowRadius, randomRadius*0.8);
        SnowEffect::snowParticles->setRadius(1.0, snowRadius, randomRadius*0.5);
        SnowEffect::snowParticles->setMass(0, snowMass, randomMass);
        SnowEffect::snowParticles->setColor(0,1, 1, 1, alpha);
        SnowEffect::snowParticles->setColor(.5, .6, .6, .6, alpha/2);
        SnowEffect::snowParticles->setColor(1, .0, .0, .0, .0);

        this->emitter->setSystem(SnowEffect::snowParticles);

        this->emitter->setRelCoor(snowCoord);
        this->emitter->setEmissionRate(rate);
        this->emitter->setEmissionVelocity(velocity, randomVelocity);
        this->emitter->setSpread(angle, randomAngle);
        this->emitter->setSize(snowSize);
  
  //SnowEffect::snowParticles->precache(8);
}


bool SnowEffect::deactivate()
{
        PRINTF(0)("Deactivating SnowEffect\n");
        activated = false;

        this->emitter->setSystem(NULL);
}

void SnowEffect::activateSnow()
{
        this->activate();
}

void SnowEffect::deactivateSnow()
{
        this->deactivate();
}

void SnowEffect::draw() const
{
}

void SnowEffect::tick(float dt)
{
  float distance = (State::getCameraNode()->getAbsCoor() - Vector(snowCoord.x, State::getCameraNode()->getAbsCoor().y, snowCoord.z)).len();
  
  if(activated)
  {
    if(distance > 0.3*snowSize.x || distance > 0.3*snowSize.y)
                  this->deactivate();
    else if(distance > 0.25*snowSize.x || distance > 0.25*snowSize.y) 
      this->alpha = 0.15;
    else if(distance > 0.2*snowSize.x || distance > 0.2*snowSize.y) 
      this->alpha = 0.25;
    else if(distance > 0.1*snowSize.x || distance > 0.1*snowSize.y) 
      this->alpha = 0.4;

    SnowEffect::snowParticles->setColor(0,1, 1, 1, alpha);
    SnowEffect::snowParticles->setColor(.5, .6, .6, .6, alpha/2);
    SnowEffect::snowParticles->setColor(1, .0, .0, .0, .0);
  }
  else
  {
  if(distance < 0.3*snowSize.x || distance < 0.3*snowSize.y )
    this->activate();
  if( distance < 0.25*snowSize.x || distance < 0.25*snowSize.y )
    this->alpha = 0.25;
  else if( distance < 0.2*snowSize.x || distance < 0.2*snowSize.y )
    this->alpha = 0.4;
  else if( distance < 0.1*snowSize.x || distance < 0.1*snowSize.y )
    this->alpha = 0.5;

    SnowEffect::snowParticles->setColor(0,1, 1, 1, alpha);
    SnowEffect::snowParticles->setColor(.5, .6, .6, .6, alpha/2);
    SnowEffect::snowParticles->setColor(1, .0, .0, .0, .0);
  }
}