File indexing completed on 2025-01-19 03:51:13 

0001 /* ============================================================
0002  *
0003  * This file is a part of digiKam project
0004  * https://www.digikam.org
0005  *
0006  * Date        : 2005-01-18
0007  * Description : triangle geometry calculation class.
0008  *
0009  * SPDX-FileCopyrightText: 2005-2024 by Gilles Caulier <caulier dot gilles at gmail dot com>
0010  *
0011  * SPDX-License-Identifier: GPL-2.0-or-later
0012  *
0013  * ============================================================ */
0014 
0015 #define RADIAN2DEGREE(a) (a * 57.295779513082)
0016 
0017 #include "perspectivetriangle.h"
0018 
0019 // C++ includes
0020 
0021 #include <cstdio>
0022 #include <cstdlib>
0023 #include <cmath>
0024 
0025 namespace DigikamEditorPerspectiveToolPlugin
0026 {
0027 
0028 PerspectiveTriangle::PerspectiveTriangle(const QPoint& A, const QPoint& B, const QPoint& C)
0029 {
0030     m_a = distanceP2P(B, C);
0031     m_b = distanceP2P(A, C);
0032     m_c = distanceP2P(A, B);
0033 }
0034 
0035 float PerspectiveTriangle::angleABC() const
0036 {
0037     return ( RADIAN2DEGREE( acos( (m_b*m_b - m_a*m_a - m_c*m_c ) / (-2*m_a*m_c ) ) ) );
0038 }
0039 
0040 float PerspectiveTriangle::angleACB() const
0041 {
0042     return ( RADIAN2DEGREE( acos( (m_c*m_c - m_a*m_a - m_b*m_b ) / (-2*m_a*m_b ) ) ) );
0043 }
0044 
0045 float PerspectiveTriangle::angleBAC() const
0046 {
0047     return ( RADIAN2DEGREE( acos( (m_a*m_a - m_b*m_b - m_c*m_c ) / (-2*m_b*m_c ) ) ) );
0048 }
0049 
0050 float PerspectiveTriangle::distanceP2P(const QPoint& p1, const QPoint& p2) const
0051 {
0052     return (sqrt( abs( p2.x()-p1.x() ) * abs( p2.x()-p1.x() ) +
0053                   abs( p2.y()-p1.y() ) * abs( p2.y()-p1.y() ) ));
0054 }
0055 
0056 } // namespace DigikamEditorPerspectiveToolPlugin