112 lines
2.4 KiB
C++
Executable file
112 lines
2.4 KiB
C++
Executable file
/*==============================================================================
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Copyright 2018 by Roland Rabien
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For more information visit www.rabiensoftware.com
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==============================================================================*/
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#pragma once
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template <typename T>
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inline T square (T in)
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{
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return in * in;
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}
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//==============================================================================
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template <typename T>
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class Ellipse
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{
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public:
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Ellipse (T a_, T b_) : a (a_), b (b_)
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{
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}
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bool isPointOn (juce::Point<T> pt, T accuracy = 0.00001)
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{
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return std::abs (1.0 - (square (pt.getX()) / square (a) + square (pt.getY()) / square (b))) < accuracy;
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}
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bool isPointOutside (juce::Point<T> pt)
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{
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return (square (pt.getX()) / square (a) + square (pt.getY()) / square (b)) > 1.0;
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}
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bool isPointInside (juce::Point<T> pt)
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{
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return (square (pt.getX()) / square (a) + square (pt.getY()) / square (b)) < 1.0;
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}
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juce::Point<T> pointAtAngle (T angle)
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{
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T x = (a * b) / std::sqrt (square (b) + square (a) * square (std::tan (angle)));
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T y = (a * b) / std::sqrt (square (a) + square (b) / square (std::tan (angle)));
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while (angle < 0) angle += double_Pi * 2;
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angle = std::fmod (angle, double_Pi * 2);
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if (angle >= double_Pi / 2 * 3)
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{
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y = -y;
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}
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else if (angle >= double_Pi)
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{
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y = -y;
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x = -x;
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}
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else if (angle >= double_Pi / 2)
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{
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x = -x;
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}
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return {x, y};
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}
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T a = 0, b = 0;
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};
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//==============================================================================
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// Solves for the slope and intercept of a line.
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template <typename T>
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bool solveLine (T x1, T y1, T x2, T y2, T& m, T& b)
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{
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if (x2 != x1)
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{
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m = (y2 - y1) / (x2 - x1);
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b = y2 - m * x2;
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return true;
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}
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else
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{
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m = 0;
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b = 0;
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return false;
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}
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}
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template <typename T>
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bool solveLine (Line<T> l, T& m, T& b)
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{
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T x1 = l.getStartX();
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T x2 = l.getEndX();
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T y1 = l.getStartY();
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T y2 = l.getEndY();
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if (x2 != x1)
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{
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m = (y2 - y1) / (x2 - x1);
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b = y2 - m * x2;
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return true;
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}
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else
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{
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m = 0;
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b = 0;
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return false;
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}
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}
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