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64 lines
2.5 KiB
C++
64 lines
2.5 KiB
C++
#ifndef SEQUENCE_SEQUENCE_H
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#define SEQUENCE_SEQUENCE_H
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#include "../shared/function.h"
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namespace Sequence {
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class Sequence : public Shared::Function {
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public:
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enum class Type {
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Explicite = 0,
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SingleRecurrence = 1,
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DoubleRecurrence = 2
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};
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Sequence(const char * text = nullptr, KDColor color = KDColorBlack);
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~Sequence();
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Type type();
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void setType(Type type);
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const char * firstInitialConditionText();
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const char * secondInitialConditionText();
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Poincare::Expression * firstInitialConditionExpression();
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Poincare::Expression * secondInitialConditionExpression();
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Poincare::ExpressionLayout * firstInitialConditionLayout();
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Poincare::ExpressionLayout * secondInitialConditionLayout();
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void setContent(const char * c) override;
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void setFirstInitialConditionContent(const char * c);
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void setSecondInitialConditionContent(const char * c);
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int numberOfElements();
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Poincare::ExpressionLayout * nameLayout();
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Poincare::ExpressionLayout * definitionName();
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Poincare::ExpressionLayout * firstInitialConditionName();
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Poincare::ExpressionLayout * secondInitialConditionName();
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bool isDefined() override;
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float evaluateAtAbscissa(float x, Poincare::Context * context) const override;
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float sumOfTermsBetweenAbscissa(float start, float end, Poincare::Context * context);
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private:
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constexpr static int k_maxRecurrentRank = 10000;
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constexpr static float k_maxNumberOfTermsInSum = 100000.0f;
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char symbol() const override;
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Type m_type;
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char m_firstInitialConditionText[TextField::maxBufferSize()];
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char m_secondInitialConditionText[TextField::maxBufferSize()];
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Poincare::Expression * m_firstInitialConditionExpression;
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Poincare::Expression * m_secondInitialConditionExpression;
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Poincare::ExpressionLayout * m_firstInitialConditionLayout;
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Poincare::ExpressionLayout * m_secondInitialConditionLayout;
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Poincare::ExpressionLayout * m_nameLayout;
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Poincare::ExpressionLayout * m_definitionName;
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Poincare::ExpressionLayout * m_firstInitialConditionName;
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Poincare::ExpressionLayout * m_secondInitialConditionName;
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/* In order to accelerate the computation of values of recurrent sequences,
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* we memoize the last computed values of the sequence and their associated
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* ranks (n and n+1 for instance). Thereby, when another evaluation at a
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* superior rank k > n+1 is called, we avoid iterating from 0 but can start
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* from n. */
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constexpr static int k_maxRecurrenceDepth = 2;
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mutable int m_indexBuffer[k_maxRecurrenceDepth];
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mutable float m_buffer[k_maxRecurrenceDepth];
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};
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}
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#endif
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