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/* Visual.cpp
Copyright (c) 2017 by Michael Zahniser
Endless Sky 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 3 of the License, or (at your option) any later version.
Endless Sky 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, see <https://www.gnu.org/licenses/>.
*/
#include "Visual.h"
#include "audio/Audio.h"
#include "Effect.h"
#include "Random.h"
using namespace std;
// Generate a visual based on the given Effect.
Visual::Visual(const Effect &effect, Point pos, Point vel, Angle facing, Point hitVelocity, double inheritedZoom)
: Body(effect, pos, vel, effect.hasAbsoluteAngle ? effect.absoluteAngle : facing),
lifetime(effect.lifetime)
{
if(effect.randomLifetime > 0)
lifetime += Random::Int(effect.randomLifetime + 1);
angle += Angle::Random(effect.randomAngle) - Angle::Random(effect.randomAngle);
spin = Angle::Random(effect.randomSpin) - Angle::Random(effect.randomSpin);
if(effect.hasAbsoluteVelocity)
velocity = angle.Unit() * effect.absoluteVelocity;
else
{
velocity *= effect.velocityScale;
velocity += hitVelocity * (1. - effect.velocityScale);
}
if(effect.randomVelocity)
velocity += angle.Unit() * Random::Real() * effect.randomVelocity;
if(effect.sound)
Audio::Play(effect.sound, position, effect.soundCategory);
if(effect.randomFrameRate)
AddFrameRate(effect.randomFrameRate * Random::Real());
if(effect.inheritsZoom)
scale *= inheritedZoom;
}
// Step the effect forward.
void Visual::Move()
{
if(lifetime-- <= 0)
MarkForRemoval();
else
{
position += velocity;
angle += spin;
}
}
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