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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"
#include "core/svg/SVGTransform.h"
#include "platform/FloatConversion.h"
#include "platform/geometry/FloatSize.h"
#include "wtf/MathExtras.h"
#include "wtf/text/StringBuilder.h"
namespace WebCore {
SVGTransform::SVGTransform()
: m_type(SVG_TRANSFORM_UNKNOWN)
, m_angle(0)
{
}
SVGTransform::SVGTransform(SVGTransformType type, ConstructionMode mode)
: m_type(type)
, m_angle(0)
{
if (mode == ConstructZeroTransform)
m_matrix = AffineTransform(0, 0, 0, 0, 0, 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::updateSVGMatrix()
{
// 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);
}
const String& SVGTransform::transformTypePrefixForParsing(SVGTransformType type)
{
switch (type) {
case SVG_TRANSFORM_UNKNOWN:
return emptyString();
case SVG_TRANSFORM_MATRIX: {
DEFINE_STATIC_LOCAL(String, matrixString, ("matrix("));
return matrixString;
}
case SVG_TRANSFORM_TRANSLATE: {
DEFINE_STATIC_LOCAL(String, translateString, ("translate("));
return translateString;
}
case SVG_TRANSFORM_SCALE: {
DEFINE_STATIC_LOCAL(String, scaleString, ("scale("));
return scaleString;
}
case SVG_TRANSFORM_ROTATE: {
DEFINE_STATIC_LOCAL(String, rotateString, ("rotate("));
return rotateString;
}
case SVG_TRANSFORM_SKEWX: {
DEFINE_STATIC_LOCAL(String, skewXString, ("skewX("));
return skewXString;
}
case SVG_TRANSFORM_SKEWY: {
DEFINE_STATIC_LOCAL(String, skewYString, ("skewY("));
return skewYString;
}
}
ASSERT_NOT_REACHED();
return emptyString();
}
String SVGTransform::valueAsString() const
{
const String& prefix = transformTypePrefixForParsing(m_type);
switch (m_type) {
case SVG_TRANSFORM_UNKNOWN:
return prefix;
case SVG_TRANSFORM_MATRIX: {
StringBuilder builder;
builder.append(prefix + String::number(m_matrix.a()) + ' ' + String::number(m_matrix.b()) + ' ' + String::number(m_matrix.c()) + ' ' +
String::number(m_matrix.d()) + ' ' + String::number(m_matrix.e()) + ' ' + String::number(m_matrix.f()) + ')');
return builder.toString();
}
case SVG_TRANSFORM_TRANSLATE:
return prefix + String::number(m_matrix.e()) + ' ' + String::number(m_matrix.f()) + ')';
case SVG_TRANSFORM_SCALE:
return prefix + 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 prefix + String::number(m_angle) + ' ' + String::number(cx) + ' ' + String::number(cy) + ')';
return prefix + String::number(m_angle) + ')';
}
case SVG_TRANSFORM_SKEWX:
return prefix + String::number(m_angle) + ')';
case SVG_TRANSFORM_SKEWY:
return prefix + String::number(m_angle) + ')';
}
ASSERT_NOT_REACHED();
return emptyString();
}
} // namespace WebCore
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