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58 lines
1.1 KiB
C++
58 lines
1.1 KiB
C++
#pragma once
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//
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// FILE: ellipse.h
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// AUTHOR: Rob Tillaart
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// DATE: 2021-10-31
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// VERSION: 0.1.4
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// PURPOSE: Arduino library for ellipse maths
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// URL: https://github.com/RobTillaart/ellipse
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#include "Arduino.h"
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#define ELLIPSE_LIB_VERSION (F("0.1.4"))
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class ellipse
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{
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public:
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ellipse(float a, float b); // a >= b
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float area();
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float circumference(); // good algorithm,
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float perimeter_ref(); // pretty slow but very good over long range
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float perimeter_Keppler();
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float perimeter_Ramanujan1();
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float perimeter_Parker();
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float perimeter_Ramanujan2();
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float eccentricity();
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// convenience functions.
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bool isCircle(float epsilon = 0.0);
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bool isFlat(); // factor 4 ==> < 15°
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void setA(float a); // uses abs(a)
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void setB(float b); // uses abs(b)
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float getA();
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float getB();
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float getC();
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float getLongRadius();
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float getShortRadius();
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// experimental
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// returns the angle if the ellipse was the shadow of a circle.
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float angle();
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private:
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float _a;
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float _b;
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};
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// -- END OF FILE --
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