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/*
* Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#if ENABLE(SVG)
#include "SVGTransform.h"
#include "FloatConversion.h"
#include "FloatPoint.h"
#include "FloatSize.h"
#include "SVGAngle.h"
#include "SVGSVGElement.h"
#include <wtf/MathExtras.h>
#include <wtf/text/StringBuilder.h>
#include <wtf/text/StringConcatenate.h>
namespace WebCore {
SVGTransform::SVGTransform()
: m_type(SVG_TRANSFORM_UNKNOWN)
, m_angle(0)
{
}
SVGTransform::SVGTransform(SVGTransformType type)
: m_type(type)
, m_angle(0)
{
}
SVGTransform::SVGTransform(const AffineTransform& matrix)
: m_type(SVG_TRANSFORM_MATRIX)
, m_angle(0)
, m_matrix(matrix)
{
}
void SVGTransform::setMatrix(const AffineTransform& matrix)
{
m_type = SVG_TRANSFORM_MATRIX;
m_angle = 0;
m_matrix = matrix;
}
void SVGTransform::updateMatrix()
{
// The underlying matrix has been changed, alter the transformation type.
// Spec: In case the matrix object is changed directly (i.e., without using the methods on the SVGTransform interface itself)
// then the type of the SVGTransform changes to SVG_TRANSFORM_MATRIX.
m_type = SVG_TRANSFORM_MATRIX;
m_angle = 0;
}
void SVGTransform::setTranslate(float tx, float ty)
{
m_type = SVG_TRANSFORM_TRANSLATE;
m_angle = 0;
m_matrix.makeIdentity();
m_matrix.translate(tx, ty);
}
FloatPoint SVGTransform::translate() const
{
return FloatPoint::narrowPrecision(m_matrix.e(), m_matrix.f());
}
void SVGTransform::setScale(float sx, float sy)
{
m_type = SVG_TRANSFORM_SCALE;
m_angle = 0;
m_center = FloatPoint();
m_matrix.makeIdentity();
m_matrix.scaleNonUniform(sx, sy);
}
FloatSize SVGTransform::scale() const
{
return FloatSize::narrowPrecision(m_matrix.a(), m_matrix.d());
}
void SVGTransform::setRotate(float angle, float cx, float cy)
{
m_type = SVG_TRANSFORM_ROTATE;
m_angle = angle;
m_center = FloatPoint(cx, cy);
// TODO: toString() implementation, which can show cx, cy (need to be stored?)
m_matrix.makeIdentity();
m_matrix.translate(cx, cy);
m_matrix.rotate(angle);
m_matrix.translate(-cx, -cy);
}
void SVGTransform::setSkewX(float angle)
{
m_type = SVG_TRANSFORM_SKEWX;
m_angle = angle;
m_matrix.makeIdentity();
m_matrix.skewX(angle);
}
void SVGTransform::setSkewY(float angle)
{
m_type = SVG_TRANSFORM_SKEWY;
m_angle = angle;
m_matrix.makeIdentity();
m_matrix.skewY(angle);
}
String SVGTransform::valueAsString() const
{
switch (m_type) {
case SVG_TRANSFORM_UNKNOWN:
return String();
case SVG_TRANSFORM_MATRIX: {
StringBuilder builder;
builder.append(makeString("matrix(", String::number(m_matrix.a()), ' ', String::number(m_matrix.b()), ' ', String::number(m_matrix.c()), ' '));
builder.append(makeString(String::number(m_matrix.d()), ' ', String::number(m_matrix.e()), ' ', String::number(m_matrix.f()), ')'));
return builder.toString();
}
case SVG_TRANSFORM_TRANSLATE:
return makeString("translate(", String::number(m_matrix.e()), ' ', String::number(m_matrix.f()), ')');
case SVG_TRANSFORM_SCALE:
return makeString("scale(", String::number(m_matrix.xScale()), ' ', String::number(m_matrix.yScale()), ')');
case SVG_TRANSFORM_ROTATE: {
double angleInRad = deg2rad(m_angle);
double cosAngle = cos(angleInRad);
double sinAngle = sin(angleInRad);
float cx = narrowPrecisionToFloat(cosAngle != 1 ? (m_matrix.e() * (1 - cosAngle) - m_matrix.f() * sinAngle) / (1 - cosAngle) / 2 : 0);
float cy = narrowPrecisionToFloat(cosAngle != 1 ? (m_matrix.e() * sinAngle / (1 - cosAngle) + m_matrix.f()) / 2 : 0);
if (cx || cy)
return makeString("rotate(", String::number(m_angle), ' ', String::number(cx), ' ', String::number(cy), ')');
return makeString("rotate(", String::number(m_angle), ')');
}
case SVG_TRANSFORM_SKEWX:
return makeString("skewX(", String::number(m_angle), ')');
case SVG_TRANSFORM_SKEWY:
return makeString("skewY(", String::number(m_angle), ')');
}
ASSERT_NOT_REACHED();
return String();
}
} // namespace WebCore
#endif // ENABLE(SVG)
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