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wave_effect.cpp
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wave_effect.cpp
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#include "wave_effect.hpp"
#include <algorithm>
#include <cmath>
TopDownWaveEffect::TopDownWaveEffect(float duration, bool inverse)
: m_duration(duration), m_inverse(inverse)
{}
void TopDownWaveEffect::fill(EffectBuffer& buffer, const EffectState& state) {
float elapsed = state.time - m_start;
if (elapsed < 0) {
return;
}
if (elapsed > m_duration) {
m_start = state.time + rand() % 4;
return;
}
float progress = elapsed / m_duration;
float progress_squared = progress*progress;
float inverse_progress = 1.0f - progress;
float inverse_squared_progress = 1.0f - progress_squared;
float dist = float(buffer.height() * progress);
Color3 color(inverse_squared_progress,
inverse_progress * inverse_squared_progress * .5,
std::max(0.0f, 1.0f - (progress * 5.0f)) * inverse_squared_progress * .3);
for (int y = 0; y < std::ceil(dist); ++y) {
if (dist - y < 1.0) {
color *= dist - y;
}
for (int x = 0; x < buffer.width(); ++x) {
if (m_inverse) {
buffer.set(x, buffer.height() - y -1, color);
} else {
buffer.set(x, y, color);
}
}
}
}