project-kyoku/modes/classicmode/graphics/animations/classicflyinganimationscena...

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#include "classicflyinganimationscenario.h"
#include "graphics/classicsprite.h"
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void ClassicFlyingAnimationScenario::launch(const std::shared_ptr<ClassicSprite> sprite, const microsec& time_begin, const microsec &time_end)
{
_sprite = sprite;
_time_begin = time_begin;
_time_end = time_end;
_percentage = ((_time_end - _time_begin) * 0.01);
}
float ClassicFlyingAnimationScenario::getPoint(float n1, float n2, float perc) const
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{
float diff = n2 - n1;
return n1 + ( diff * perc );
}
void ClassicFlyingAnimationScenario::update(const microsec& music_offset)
{
const auto crd = _sprite->coordinates();
auto update_time = music_offset - _time_begin;
float i = update_time / _percentage * 0.01;
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float xa = getPoint( crd.x + 20. , crd.x + 90. , i );
float ya = getPoint( crd.y - 600. , crd.y - 150. , i );
float xb = getPoint( crd.x + 90. , crd.x , i );
float yb = getPoint( crd.y - 150. , crd.y , i );
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_sprite->setTrailCoordinates(Coordinates(getPoint( xa , xb , i ), getPoint( ya , yb , i )));
bool pastPerfectScore = (i >= 1);
if (pastPerfectScore)
fadeTrailSprite();
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}
bool ClassicFlyingAnimationScenario::isDone() const
{
return false;
}
void ClassicFlyingAnimationScenario::fadeTrailSprite() const
{
auto fill_color = _sprite->trailColor();
if (fill_color.a == 0)
return;
auto new_alpha = fill_color.a - 35;
fill_color.a = new_alpha < 0 ? 0 : new_alpha;
_sprite->setTrailColor(fill_color);
}