mmsubs.h

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/******************************************************************************************************
 * (C) 2014 markummitchell@github.com. This file is part of Engauge Digitizer, which is released      *
 * under GNU General Public License version 2 (GPLv2) or (at your option) any later version. See file *
 * LICENSE or go to gnu.org/licenses for details. Distribution requires prior written permission.     *
 ******************************************************************************************************/
 
#ifndef MM_SUBS_H
#define MM_SUBS_H
 
#include <QRgb>
 
class QImage;
class QPointF;

extern double angleBetweenVectors (const QPointF &v1,
                                   const QPointF &v2);

extern double angleFromBasisVectors (double xBasis0,
                                     double yBasis0,
                                     double xBasis1,
                                     double yBasis1,
                                     double x,
                                     double y);

extern double angleFromVectorToVector (const QPointF &vFrom,
                                       const QPointF &vTo);

extern double dot (const QPointF &vec1,
                   const QPointF &vec2);

extern void ellipseFromParallelogram (double xTL,
                                      double yTL,
                                      double xTR,
                                      double yTR,
                                      double xBR,
                                      double yBR,
                                      double &angleRadians,
                                      double &aAligned,
                                      double &bAligned);

extern double magnitude (const QPointF &vec);

extern QPointF normalize (const QPointF &vec);

extern QRgb pixelRGB (const QImage &image, int x, int y);

extern QRgb pixelRGB1 (const QImage &image1Bit, int x, int y);

extern QRgb pixelRGB8 (const QImage &image8Bit, int x, int y);

extern QRgb pixelRGB32 (const QImage &image32Bit, int x, int y);

extern void projectPointOntoLine(double xToProject,
                                 double yToProject,
                                 double xStart,
                                 double yStart,
                                 double xStop,
                                 double yStop,
                                 double *xProjection,
                                 double *yProjection,
                                 double *projectedDistanceOutsideLine,
                                 double *distanceToLine);

extern void setPixelRGB (QImage &image, int x, int y, QRgb q);

extern void setPixelRGB1 (QImage &image1Bit, int x, int y, QRgb q);

extern void setPixelRGB8 (QImage &image8Bit, int x, int y, QRgb q);

extern void setPixelRGB32 (QImage &image32Bit, int x, int y, QRgb q);
  
#endif // MM_SUBS_H