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68 lines
1.6 KiB
68 lines
1.6 KiB
15 years ago
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/*
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* kis_vec.cc - part of KImageShop
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*
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* Copyright (c) 1999 Matthias Elter <me@kde.org>
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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 2 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, 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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#include "kis_vec.h"
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KisVector2D& KisVector2D::normalize()
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{
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double length, ilength;
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length = m_x*m_x + m_y*m_y;
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length = sqrt (length);
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if (length > epsilon)
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{
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ilength = 1/length;
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m_x *= ilength;
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m_y *= ilength;
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}
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return *this;
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}
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KisVector3D& KisVector3D::normalize()
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{
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double length, ilength;
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length = m_x*m_x + m_y*m_y + m_z*m_z;
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length = sqrt (length);
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if (length > epsilon)
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{
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ilength = 1/length;
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m_x *= ilength;
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m_y *= ilength;
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m_z *= ilength;
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}
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return *this;
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}
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KisVector3D& KisVector3D::crossProduct(const KisVector3D &v)
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{
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double x,y,z;
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x = m_y*v.m_z - m_z*v.m_y;
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y = m_z*v.m_x - m_x*v.m_z;
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z = m_x*v.m_y - m_y*v.m_x;
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m_x=x; m_y=y; m_z=z;
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return *this;
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}
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