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71 lines
2.8 KiB
71 lines
2.8 KiB
14 years ago
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/*
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* This file is part of Chalk
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*
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* Copyright (c) 2006 Cyrille Berger <cberger@cberger.net>
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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; version 2 of the License.
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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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef _KIS_PERSPECTVE_MATH_H_
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#define _KIS_PERSPECTVE_MATH_H_
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#include "kis_point.h"
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class TQRect;
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class KisPerspectiveMath {
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private:
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KisPerspectiveMath() { }
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public:
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static double* computeMatrixTransfo( const KisPoint& topLeft1, const KisPoint& topRight1, const KisPoint& bottomLeft1, const KisPoint& bottomRight1 , const KisPoint& topLeft2, const KisPoint& topRight2, const KisPoint& bottomLeft2, const KisPoint& bottomRight2);
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static double* computeMatrixTransfoToPerspective(const KisPoint& topLeft, const KisPoint& topRight, const KisPoint& bottomLeft, const KisPoint& bottomRight, const TQRect& r);
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static double* computeMatrixTransfoFromPerspective(const TQRect& r, const KisPoint& topLeft, const KisPoint& topRight, const KisPoint& bottomLeft, const KisPoint& bottomRight);
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struct LineEquation {
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// y = a*x + b
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double a, b;
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};
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/// TODO: get ride of this in 2.0
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inline static KisPoint matProd(const double (&m)[3][3], const KisPoint& p)
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{
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double s = ( p.x() * m[2][0] + p.y() * m[2][1] + 1.0);
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s = (s == 0.) ? 1. : 1./s;
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return KisPoint( (p.x() * m[0][0] + p.y() * m[0][1] + m[0][2] ) * s,
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(p.x() * m[1][0] + p.y() * m[1][1] + m[1][2] ) * s );
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}
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static inline LineEquation computeLineEquation(const KisPoint* p1, const KisPoint* p2)
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{
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LineEquation eq;
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double x1 = p1->x(); double x2 = p2->x();
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if( fabs(x1 - x2) < 0.000001 )
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{
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x1 += 0.0001; // Introduce a small perturbation
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}
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eq.a = (p2->y() - p1->y()) / (double)( x2 - x1 );
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eq.b = -eq.a * x1 + p1->y();
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return eq;
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}
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static inline KisPoint computeIntersection(const LineEquation& d1, const LineEquation& d2)
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{
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double a1 = d1.a; double a2 = d2.a;
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if( fabs(a1 - a2) < 0.000001 )
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{
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a1 += 0.0001; // Introduce a small perturbation
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}
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double x = (d1.b - d2.b) / (a2 - a1);
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return KisPoint(x, a2 * x + d2.b);
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}
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};
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#endif
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