82 lines
1.9 KiB
C++
82 lines
1.9 KiB
C++
#ifndef EUCLIDEAN_H
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#define EUCLIDEAN_H
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#define MAX_PATTERN_LEN 16
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struct PatternState {
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uint8_t steps;
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uint8_t hits;
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};
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const PatternState DEFAULT_PATTERN = {1, 1};
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class Pattern {
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public:
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Pattern() {}
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~Pattern() {}
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enum Step {
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REST,
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HIT,
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};
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void Init(PatternState state) {
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steps_ = constrain(state.steps, 1, MAX_PATTERN_LEN);
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hits_ = constrain(state.hits, 1, steps_);
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updatePattern();
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}
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PatternState GetState() { return {steps_, hits_}; }
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Step GetCurrentStep(byte i) { return pattern_[i]; }
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void SetSteps(int steps) {
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steps_ = constrain(steps, 1, MAX_PATTERN_LEN);
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hits_ = min(hits_, steps_);
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updatePattern();
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}
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void SetHits(int hits) {
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hits_ = constrain(hits, 1, steps_);
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updatePattern();
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}
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void Reset() { step_index_ = 0; }
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uint8_t GetSteps() { return steps_; }
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uint8_t GetHits() { return hits_; }
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uint8_t GetStepIndex() { return step_index_; }
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// Get the current step value and advance the euclidean rhythm step index
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// to the next step in the pattern.
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Step NextStep() {
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if (steps_ == 0) return REST;
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Step value = GetCurrentStep(step_index_);
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step_index_ = (step_index_ < steps_ - 1) ? step_index_ + 1 : 0;
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return value;
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}
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private:
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uint8_t steps_ = 0;
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uint8_t hits_ = 0;
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volatile uint8_t step_index_ = 0;
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Step pattern_[MAX_PATTERN_LEN];
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// Update the euclidean rhythm pattern when attributes change.
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void updatePattern() {
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byte bucket = 0;
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pattern_[0] = HIT;
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for (int i = 1; i < steps_; i++) {
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bucket += hits_;
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if (bucket >= steps_) {
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bucket -= steps_;
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pattern_[i] = HIT;
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} else {
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pattern_[i] = REST;
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}
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}
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}
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};
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#endif |