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emulateur/epsilon-nofrendo/apps/regression/model/trigonometric_model.cpp 3.21 KB
6663b6c9   adorian   projet complet av...
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  #include "trigonometric_model.h"
  #include "../../shared/poincare_helpers.h"
  #include "../../poincare/include/poincare_layouts.h"
  #include <math.h>
  #include <poincare/preferences.h>
  #include <assert.h>
  
  using namespace Poincare;
  using namespace Shared;
  
  namespace Regression {
  
  ExpressionLayout * TrigonometricModel::layout() {
    static ExpressionLayout * layout = nullptr;
    if (layout == nullptr) {
      const ExpressionLayout * layoutChildren[] = {
        new CharLayout('a', KDText::FontSize::Small),
        new CharLayout(Ion::Charset::MiddleDot, KDText::FontSize::Small),
        new CharLayout('s', KDText::FontSize::Small),
        new CharLayout('i', KDText::FontSize::Small),
        new CharLayout('n', KDText::FontSize::Small),
        new CharLayout('(', KDText::FontSize::Small),
        new CharLayout('b', KDText::FontSize::Small),
        new CharLayout(Ion::Charset::MiddleDot, KDText::FontSize::Small),
        new CharLayout('X', KDText::FontSize::Small),
        new CharLayout('+', KDText::FontSize::Small),
        new CharLayout('c', KDText::FontSize::Small),
        new CharLayout(')', KDText::FontSize::Small),
        new CharLayout('+', KDText::FontSize::Small),
        new CharLayout('d', KDText::FontSize::Small)
      };
      layout = new HorizontalLayout(layoutChildren, 14, false);
    }
    return layout;
  }
  
  Expression * TrigonometricModel::simplifiedExpression(double * modelCoefficients, Poincare::Context * context) {
    double a = modelCoefficients[0];
    double b = modelCoefficients[1];
    double c = modelCoefficients[2];
    double d = modelCoefficients[3];
    Expression * aExpression = new Decimal(a);
    Expression * sinExpression = new Sine(
        new Addition(
          new Multiplication(
            new Decimal(b),
            new Symbol('x'),
            false),
          new Decimal(c),
          false),
        false);
    Expression * asinExpression = new Multiplication(aExpression, sinExpression, false);
    Expression * dExpression = new Decimal(d);
    Expression * result = new Addition(asinExpression, dExpression, false);
    PoincareHelpers::Simplify(&result, *context);
    return result;
  }
  
  double TrigonometricModel::evaluate(double * modelCoefficients, double x) const {
    double a = modelCoefficients[0];
    double b = modelCoefficients[1];
    double c = modelCoefficients[2];
    double d = modelCoefficients[3];
    double radianX = Poincare::Preferences::sharedPreferences()->angleUnit() == Poincare::Expression::AngleUnit::Radian ? x : x * M_PI/180.0;
    return a*sin(b*radianX+c)+d;
  }
  
  double TrigonometricModel::partialDerivate(double * modelCoefficients, int derivateCoefficientIndex, double x) const {
    double a = modelCoefficients[0];
    double b = modelCoefficients[1];
    double c = modelCoefficients[2];
    double radianX = Poincare::Preferences::sharedPreferences()->angleUnit() == Poincare::Expression::AngleUnit::Radian ? x : x * M_PI/180.0;
    if (derivateCoefficientIndex == 0) {
      // Derivate: sin(b*x+c)
      return sin(b*radianX+c);
    }
    if (derivateCoefficientIndex == 1) {
      // Derivate: x*a*cos(b*x+c);
      return radianX*a*cos(b*radianX+c);
    }
    if (derivateCoefficientIndex == 2) {
      // Derivate: a*cos(b*x+c)
      return a*cos(b*radianX+c);
    }
    if (derivateCoefficientIndex == 3) {
      // Derivate: 1
      return 1.0;
    }
    assert(false);
    return 0.0;
  }
  
  }