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552dca9494
ContinuousFunction now has an attribute of type ContinuousFunctionCache, implementing methods to store and retrieve 320 float values, in order to speed up function display in Graph. Change-Id: I6f7ccdf3ae3c6dd8b08b93d786c8d0be7aa4dee8
49 lines
1.7 KiB
C++
49 lines
1.7 KiB
C++
#ifndef SHARED_CONTINUOUS_FUNCTION_CACHE_H
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#define SHARED_CONTINUOUS_FUNCTION_CACHE_H
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#include <ion/display.h>
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#include <poincare/context.h>
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#include <poincare/coordinate_2D.h>
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namespace Shared {
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class ContinuousFunction;
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class ContinuousFunctionCache {
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public:
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static void PrepareCache(void * f, void * c, float tMin, float tStep);
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float step() const { return m_tStep; }
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bool filled() const { return m_filled; }
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void clear();
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Poincare::Coordinate2D<float> valueForParameter(const ContinuousFunction * function, float t) const;
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private:
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/* The size of the cache is chosen to optimize the display of cartesian
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* function */
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static constexpr int k_sizeOfCache = Ion::Display::Width;
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static constexpr float k_cacheHitTolerance = 1e-3;
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static float StepFactor(ContinuousFunction * function);
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void setRange(ContinuousFunction * function, float tMin, float tStep);
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void memoize(ContinuousFunction * function, Poincare::Context * context);
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void memoizeYForX(ContinuousFunction * function, Poincare::Context * context);
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void memoizeYForXBetweenIndices(ContinuousFunction * function, Poincare::Context * context, int iInf, int iSup);
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void memoizeXYForT(ContinuousFunction * function, Poincare::Context * context);
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float parameterForIndex(int i) const;
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int indexForParameter(const ContinuousFunction * function, float t) const;
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void pan(ContinuousFunction * function, Poincare::Context * context, float newTMin);
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float m_tMin, m_tStep;
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float m_cache[k_sizeOfCache];
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/* m_startOfCache is used to implement a circular buffer for easy panning
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* with cartesian functions. When dealing with parametric or polar functions,
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* m_startOfCache should be zero.*/
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int m_startOfCache;
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bool m_filled;
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};
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}
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#endif
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