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SVGAngle.cpp

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00001 /*
00002     Copyright (C) 2004, 2005, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
00003                   2004, 2005, 2006 Rob Buis <buis@kde.org>
00004 
00005     This file is part of the KDE project
00006 
00007     This library is free software; you can redistribute it and/or
00008     modify it under the terms of the GNU Library General Public
00009     License as published by the Free Software Foundation; either
00010     version 2 of the License, or (at your option) any later version.
00011 
00012     This library is distributed in the hope that it will be useful,
00013     but WITHOUT ANY WARRANTY; without even the implied warranty of
00014     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015     Library General Public License for more details.
00016 
00017     You should have received a copy of the GNU Library General Public License
00018     along with this library; see the file COPYING.LIB.  If not, write to
00019     the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
00020     Boston, MA 02110-1301, USA.
00021 */
00022 
00023 #include "config.h"
00024 #include "wtf/Platform.h"
00025 
00026 #if ENABLE(SVG)
00027 #include "SVGAngle.h"
00028 
00029 #include <math.h>
00030 #include <wtf/MathExtras.h>
00031 
00032 namespace WebCore {
00033 
00034 SVGAngle::SVGAngle()
00035     : RefCounted<SVGAngle>(0)
00036     , m_unitType(SVG_ANGLETYPE_UNKNOWN)
00037     , m_value(0)
00038     , m_valueInSpecifiedUnits(0)
00039 {
00040 }
00041 
00042 SVGAngle::~SVGAngle()
00043 {
00044 }
00045 
00046 SVGAngle::SVGAngleType SVGAngle::unitType() const
00047 {
00048     return m_unitType;
00049 }
00050 
00051 void SVGAngle::setValue(float value)
00052 {
00053     m_value = value;
00054 }
00055 
00056 float SVGAngle::value() const
00057 {
00058     return m_value;
00059 }
00060 
00061 // calc m_value
00062 void SVGAngle::calculate()
00063 {
00064     if (m_unitType == SVG_ANGLETYPE_GRAD)
00065         m_value = grad2deg(m_valueInSpecifiedUnits);
00066     else if (m_unitType == SVG_ANGLETYPE_RAD)
00067         m_value = rad2deg(m_valueInSpecifiedUnits);
00068     else if (m_unitType == SVG_ANGLETYPE_UNSPECIFIED || m_unitType == SVG_ANGLETYPE_DEG)
00069         m_value = m_valueInSpecifiedUnits;
00070 }
00071 
00072 void SVGAngle::setValueInSpecifiedUnits(float valueInSpecifiedUnits)
00073 {
00074     m_valueInSpecifiedUnits = valueInSpecifiedUnits;
00075     calculate();
00076 }
00077 
00078 float SVGAngle::valueInSpecifiedUnits() const
00079 {
00080     return m_valueInSpecifiedUnits;
00081 }
00082 
00083 void SVGAngle::setValueAsString(const String& s)
00084 {
00085     m_valueAsString = s;
00086 
00087     bool bOK;
00088     m_valueInSpecifiedUnits = m_valueAsString.toFloat(&bOK);
00089     m_unitType = SVG_ANGLETYPE_UNSPECIFIED;
00090 
00091     if (!bOK) {
00092         if (m_valueAsString.endsWith("deg"))
00093             m_unitType = SVG_ANGLETYPE_DEG;
00094         else if (m_valueAsString.endsWith("grad"))
00095             m_unitType = SVG_ANGLETYPE_GRAD;
00096         else if (m_valueAsString.endsWith("rad"))
00097             m_unitType = SVG_ANGLETYPE_RAD;
00098     }
00099     
00100     calculate();
00101 }
00102 
00103 String SVGAngle::valueAsString() const
00104 {
00105     m_valueAsString = String::number(m_valueInSpecifiedUnits);
00106 
00107     switch (m_unitType) {
00108         case SVG_ANGLETYPE_UNSPECIFIED:
00109         case SVG_ANGLETYPE_DEG:
00110             m_valueAsString += "deg";
00111             break;
00112         case SVG_ANGLETYPE_RAD:
00113             m_valueAsString += "rad";
00114             break;
00115         case SVG_ANGLETYPE_GRAD:
00116             m_valueAsString += "grad";
00117             break;
00118         case SVG_ANGLETYPE_UNKNOWN:
00119             break;
00120     }
00121     
00122     return m_valueAsString;
00123 }
00124 
00125 void SVGAngle::newValueSpecifiedUnits(unsigned short unitType, float valueInSpecifiedUnits)
00126 {
00127     m_unitType = (SVGAngleType)unitType;
00128     m_valueInSpecifiedUnits = valueInSpecifiedUnits;
00129     calculate();
00130 }
00131 
00132 void SVGAngle::convertToSpecifiedUnits(unsigned short unitType)
00133 {
00134     if (m_unitType == unitType)
00135         return;
00136 
00137     if (m_unitType == SVG_ANGLETYPE_DEG && unitType == SVG_ANGLETYPE_RAD)
00138         m_valueInSpecifiedUnits = deg2rad(m_valueInSpecifiedUnits);
00139     else if (m_unitType == SVG_ANGLETYPE_GRAD && unitType == SVG_ANGLETYPE_RAD)
00140         m_valueInSpecifiedUnits = grad2rad(m_valueInSpecifiedUnits);
00141     else if (m_unitType == SVG_ANGLETYPE_DEG && unitType == SVG_ANGLETYPE_GRAD)
00142         m_valueInSpecifiedUnits = deg2grad(m_valueInSpecifiedUnits);
00143     else if (m_unitType == SVG_ANGLETYPE_RAD && unitType == SVG_ANGLETYPE_GRAD)
00144         m_valueInSpecifiedUnits = rad2grad(m_valueInSpecifiedUnits);
00145     else if (m_unitType == SVG_ANGLETYPE_RAD && unitType == SVG_ANGLETYPE_DEG)
00146         m_valueInSpecifiedUnits = rad2deg(m_valueInSpecifiedUnits);
00147     else if (m_unitType == SVG_ANGLETYPE_GRAD && unitType == SVG_ANGLETYPE_DEG)
00148         m_valueInSpecifiedUnits = grad2deg(m_valueInSpecifiedUnits);
00149 
00150     m_unitType = (SVGAngleType)unitType;
00151 }
00152 
00153 // Helpers
00154 double SVGAngle::todeg(double rad)
00155 {
00156     return rad2deg(rad);
00157 }
00158 
00159 double SVGAngle::torad(double deg)
00160 {
00161     return deg2rad(deg);
00162 }
00163 
00164 double SVGAngle::shortestArcBisector(double angle1, double angle2)
00165 {
00166     double bisector = (angle1 + angle2) / 2;
00167 
00168     if (fabs(angle1 - angle2) > 180)
00169         bisector += 180;
00170 
00171     return bisector;
00172 }
00173 
00174 }
00175 
00176 #endif // ENABLE(SVG)

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