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64 lines
1.2 KiB
C++
64 lines
1.2 KiB
C++
#pragma once
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#include "IPlotter.h"
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#include "PlotDirection.h"
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#include "Vec2i.h"
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#define PL_DEBUG_ELLIPSE_PLOTTER 0
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namespace PortabilityLayer
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{
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struct Rect2i;
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class EllipsePlotter final : public IPlotter
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{
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public:
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EllipsePlotter();
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PlotDirection PlotNext() override;
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const Vec2i &GetPoint() const override;
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void Reset(const Rect2i &bounds);
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private:
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enum Quadrant
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{
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Quadrant_NxNy,
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Quadrant_NxPy,
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Quadrant_PxNy,
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Quadrant_PxPy,
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Quadrant_Finished
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};
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void IncrementX();
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bool ConditionalIncrementX();
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void IncrementY();
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bool ConditionalIncrementY();
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void DecrementX();
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bool ConditionalDecrementX();
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void DecrementY();
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bool ConditionalDecrementY();
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Vec2i m_2center;
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Vec2i m_point;
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Vec2i m_diameters;
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int32_t m_sqDistFromEdgeOver4RoundedUp;
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Quadrant m_quadrant;
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int32_t m_xChangeCostDynamicFactorOver4;
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int32_t m_yChangeCostDynamicFactorOver4;
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int32_t m_xChangeCostDynamicFactorStepOver4;
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int32_t m_yChangeCostDynamicFactorStepOver4;
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int32_t m_xChangeCostStaticFactorOver4;
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int32_t m_yChangeCostStaticFactorOver4;
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#if PL_DEBUG_ELLIPSE_PLOTTER
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Vec2i m_2offsetFromCenter;
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int32_t m_sqDistFromEdge;
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#endif
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};
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}
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