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67 lines
1.8 KiB
67 lines
1.8 KiB
/*
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Rosegarden
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A sequencer and musical notation editor.
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This program is Copyright 2000-2008
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Guillaume Laurent <glaurent@telegraph-road.org>,
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Chris Cannam <cannam@all-day-breakfast.com>,
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Richard Bown <bownie@bownie.com>
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The moral right of the authors to claim authorship of this work
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has been asserted.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version. See the file
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COPYING included with this distribution for more information.
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*/
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#include "Equation.h"
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namespace Rosegarden {
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void Equation::solve(Unknown u, double &y, double &m, double &x, double &c)
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{
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switch(u) {
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case Y: y = m*x + c; break;
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case M: m = (y - c) / x; break;
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case X: x = (y - c) / m; break;
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case C: c = y - m*x; break;
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}
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}
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void Equation::solve(Unknown u, int &y, double &m, int &x, int &c)
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{
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switch(u) {
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case Y: y = static_cast<int>(m*x) + c; break;
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case M: m = static_cast<double>(y - c) / static_cast<double>(x); break;
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case X: x = static_cast<int>(static_cast<float>(y - c) / m); break;
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case C: c = y - static_cast<int>(m*x); break;
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}
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}
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void Equation::solveForYByEndPoints(Point a, Point b, double x, double &y)
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{
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double m, c, y1, x1;
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m = static_cast<double>(b.y - a.y) / static_cast<double>(b.x - a.x);
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x1 = a.x; y1 = a.y;
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solve(C, y1, m, x1, c);
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solve(Y, y, m, x, c);
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}
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void Equation::solveForYByEndPoints(Point a, Point b, int x, int &y)
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{
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double m;
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int c;
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m = static_cast<double>(b.y - a.y) / static_cast<double>(b.x - a.x);
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solve(C, a.y, m, a.x, c);
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solve(Y, y, m, x, c);
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}
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}
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