mirror of
https://github.com/mapmapteam/mapmap.git
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61 lines
1.9 KiB
C++
61 lines
1.9 KiB
C++
/*
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* Util.cpp
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*
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* (c) 2013 Sofian Audry -- info(@)sofianaudry(.)com
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "Util.h"
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#include <algorithm>
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namespace Util {
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void correctGlTexCoord(GLfloat x, GLfloat y)
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{
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glTexCoord2f (x, 1.0f - y);
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}
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/**
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* Convenience function to map a variable from one coordinate space
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* to another.
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* The result is clipped in the range [ostart, ostop]
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* Make sure ostop is bigger than ostart.
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*
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* To map a MIDI control value into the [0,1] range:
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* map(value, 0.0, 1.0, 0. 127.);
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*
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* Depends on: #include <algorithm>
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*/
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float map_float(float value, float istart, float istop, float ostart, float ostop)
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{
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float ret = ostart + (ostop - ostart) * ((value - istart) / (istop - istart));
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// In Processing, they don't do the following: (clipping)
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return std::max(std::min(ret, ostop), ostart);
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}
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/**
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* See map_float
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*/
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int map_int(int value, int istart, int istop, int ostart, int ostop)
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{
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float ret = ostart + (ostop - ostart) * ((value - istart) / float(istop - istart));
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//g_print("%f = %d + (%d-%d) * ((%d-%d) / (%d-%d))", ret, ostart, ostop, ostart, value, istart, istop, istart);
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// In Processing, they don't do the following: (clipping)
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return std::max(std::min(int(ret), ostop), ostart);
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}
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} // end of namespace
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