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64 lines
2.0 KiB
C++
64 lines
2.0 KiB
C++
#pragma once
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#include "esphome/core/hal.h"
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#include "esphome/core/helpers.h"
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#include "light_color_values.h"
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namespace esphome {
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namespace light {
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/// Base class for all light color transformers, such as transitions or flashes.
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class LightTransformer {
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public:
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virtual ~LightTransformer() = default;
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void setup(const LightColorValues &start_values, const LightColorValues &target_values, uint32_t length) {
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this->start_time_ = millis();
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this->length_ = length;
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this->start_values_ = start_values;
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this->target_values_ = target_values;
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this->start();
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}
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/// Indicates whether this transformation is finished.
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virtual bool is_finished() { return this->get_progress_() >= 1.0f; }
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/// This will be called before the transition is started.
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virtual void start() {}
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/// This will be called while the transformer is active to apply the transition to the light. Can either write to the
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/// light directly, or return LightColorValues that will be applied.
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virtual optional<LightColorValues> apply() = 0;
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/// This will be called after transition is finished.
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virtual void stop() {}
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const LightColorValues &get_start_values() const { return this->start_values_; }
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const LightColorValues &get_target_values() const { return this->target_values_; }
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protected:
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// This looks crazy, but it reduces to 6x^5 - 15x^4 + 10x^3 which is just a smooth sigmoid-like
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// transition from 0 to 1 on x = [0, 1]
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static float smoothed_progress(float x) { return x * x * x * (x * (x * 6.0f - 15.0f) + 10.0f); }
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/// The progress of this transition, on a scale of 0 to 1.
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float get_progress_() {
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uint32_t now = esphome::millis();
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if (now < this->start_time_)
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return 0.0f;
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if (now >= this->start_time_ + this->length_)
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return 1.0f;
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return clamp((now - this->start_time_) / float(this->length_), 0.0f, 1.0f);
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}
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uint32_t start_time_;
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uint32_t length_;
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LightColorValues start_values_;
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LightColorValues target_values_;
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};
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} // namespace light
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} // namespace esphome
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