curveinterpolator.h

Go to the documentation of this file.

#ifndef SENSESP_TRANSFORMS_CURVEINTERPOLATOR_H_
#define SENSESP_TRANSFORMS_CURVEINTERPOLATOR_H_
 
#include "sensesp/ui/config_item.h"
#include "transform.h"
 
namespace sensesp {
 
class CurveInterpolator : public FloatTransform {
 public:
  class Sample {
   public:
    float input_{};
    float output_{};
 
    Sample();
    Sample(float input, float output);
    Sample(JsonObject& obj);
 
    friend bool operator<(const Sample& lhs, const Sample& rhs) {
      return lhs.input_ < rhs.input_;
    }
  };
 
 public:
  CurveInterpolator(std::set<Sample>* defaults = NULL,
                    const String& config_path = "");
 
  // Set and retrieve the transformed value
  void set(const float& input) override;
 
  // Web UI configuration methods
  CurveInterpolator* set_input_title(String input_title) {
    input_title_ = input_title;
    return this;
  }
  CurveInterpolator* set_output_title(String output_title) {
    output_title_ = output_title;
    return this;
  }
 
  // For reading and writing the configuration of this transformation
  virtual bool to_json(JsonObject& doc) override;
  virtual bool from_json(const JsonObject& doc) override;
 
  // For manually adding sample points
  void clear_samples();
 
  void add_sample(const Sample& new_sample);
 
  const std::set<Sample>& get_samples() const { return samples_; }
 
 protected:
  std::set<Sample> samples_{};
  String input_title_ = "Input";
  String output_title_ = "Output";
 
  friend const char* ConfigSchema(const CurveInterpolator& obj);
};
 
inline const char* ConfigSchema(const CurveInterpolator& obj) {
  static const char schema[] = R"({"type":"object","properties":{"samples":{"title":"Sample values","type":"array","format":"table","items":{"type":"object","properties":{"input":{"type":"number","title":"%s"},"output":{"type":"number","title":"%s"}}}}}})";
  static char buf[sizeof(schema) + 160];
  snprintf(buf, sizeof(buf), schema, obj.input_title_.c_str(),
           obj.output_title_.c_str());
  return buf;
}
 
}  // namespace sensesp
 
#endif