47 lines
1.1 KiB
C++
47 lines
1.1 KiB
C++
#include "scenes/sprite_mover.hpp"
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#include <algorithm>
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namespace scenes {
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void SpriteMover::moveTo(int x0, int y0, int x1, int y1, int duration_ms, EaseFn ease) {
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x0_ = x0;
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y0_ = y0;
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x1_ = x1;
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y1_ = y1;
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duration_ms_ = std::max(0, duration_ms);
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elapsed_ms_ = 0;
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ease_ = ease ? ease : Easing::linear;
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cur_x_ = x0;
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cur_y_ = y0;
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}
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void SpriteMover::setPosition(int x, int y) {
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cur_x_ = x;
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cur_y_ = y;
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x0_ = x1_ = x;
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y0_ = y1_ = y;
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duration_ms_ = 0;
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elapsed_ms_ = 0;
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}
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void SpriteMover::tick(int delta_ms) {
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if (duration_ms_ <= 0) {
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cur_x_ = x1_;
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cur_y_ = y1_;
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return;
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}
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elapsed_ms_ = std::min(elapsed_ms_ + delta_ms, duration_ms_);
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const float t = static_cast<float>(elapsed_ms_) / static_cast<float>(duration_ms_);
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const float eased = ease_(t);
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cur_x_ = Easing::lerpInt(x0_, x1_, eased);
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cur_y_ = Easing::lerpInt(y0_, y1_, eased);
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}
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float SpriteMover::progress() const {
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if (duration_ms_ <= 0) return 1.0f;
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return static_cast<float>(elapsed_ms_) / static_cast<float>(duration_ms_);
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}
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} // namespace scenes
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