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// ____ _ __
// / __ )____ _____ | | / /___ ___________
// / __ / __ \/ ___/ | | /| / / __ `/ ___/ ___/
// / /_/ / /_/ (__ ) | |/ |/ / /_/ / / (__ )
// /_____/\____/____/ |__/|__/\__,_/_/ /____/
//
// A futuristic real-time strategy game.
// This file is part of Bos Wars.
//
/**@name chunkparticle.cpp - The chunk particle. */
//
// (c) Copyright 2007-2008 by Jimmy Salmon and Francois Beerten
//
// 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; only version 2 of the License.
//
// This program 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 this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
// 02111-1307, USA.
//
//@{
#include <math.h>
#include "stratagus.h"
#include "particle.h"
#include "video.h"
static const int gravity = 32 * 12;
static inline float deg2rad(int degrees) {
return degrees * (3.1415926535f / 180);
}
CChunkParticle::CChunkParticle(CPosition position, Animation *smokeAnimation) :
CParticle(position), initialPos(position), nextSmokeTicks(0), age(0),
height(0.f)
{
float radians = deg2rad(MyRand() % 360);
direction.x = cos(radians);
direction.y = sin(radians);
const int maxVelocity = 400;
initialVelocity = MyRand() % maxVelocity;
int minTrajectoryAngle = 77;
trajectoryAngle = deg2rad(MyRand() % (90 - minTrajectoryAngle) + minTrajectoryAngle);
lifetime = (int)(1000 * (initialVelocity * sin(trajectoryAngle) / gravity) * 2);
this->smokeAnimation = smokeAnimation->clone();
}
CChunkParticle::~CChunkParticle()
{
delete smokeAnimation;
}
static float calculateScreenPos(float posy, float height)
{
return posy - height * 0.2f;
}
void CChunkParticle::draw()
{
CPosition screenPos = ParticleManager.getScreenPos(pos);
Uint32 color = ColorBlack;
Video.DrawRectangleClip(color, (int)screenPos.x - 1, (int)calculateScreenPos(screenPos.y, height) - 1, 2, 2);
}
static float getHorizontalPosition(int initialVelocity, float trajectoryAngle, float time)
{
return (initialVelocity * cos(trajectoryAngle)) * time;
}
static float getVerticalPosition(int initialVelocity, float trajectoryAngle, float time)
{
return (initialVelocity * sin(trajectoryAngle)) * time - (gravity / 2.0f) * (time * time);
}
void CChunkParticle::update(int ticks)
{
age += ticks;
if (age >= lifetime) {
destroy();
return;
}
const int minSmokeTicks = 150;
const int randSmokeTicks = 50;
if (age > nextSmokeTicks) {
CPosition p(pos.x, calculateScreenPos(pos.y, height));
Animation *animation = smokeAnimation->clone();
CSmokeParticle *smoke = new CSmokeParticle(p, animation);
ParticleManager.add(smoke);
nextSmokeTicks += MyRand() % randSmokeTicks + minSmokeTicks;
}
float time = age / 1000.f;
float distance = getHorizontalPosition(initialVelocity, trajectoryAngle, time);
pos.x = initialPos.x + distance * direction.x;
pos.y = initialPos.y + distance * direction.y;
height = getVerticalPosition(initialVelocity, trajectoryAngle, time);
}
CParticle* CChunkParticle::clone()
{
return new CChunkParticle(pos, smokeAnimation);
}
//@}
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