1 /*
2 * Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>
3 * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public License
16 * along with this library; see the file COPYING.LIB. If not, write to
17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
19 */
20
21 #include "config.h"
22
23 #if ENABLE(SVG)
24 #include "SVGTransform.h"
25
26 #include "FloatConversion.h"
27 #include "FloatPoint.h"
28 #include "FloatSize.h"
29 #include "SVGAngle.h"
30 #include "SVGSVGElement.h"
31 #include <wtf/MathExtras.h>
32 #include <wtf/text/StringBuilder.h>
33 #include <wtf/text/StringConcatenate.h>
34
35 namespace WebCore {
36
SVGTransform()37 SVGTransform::SVGTransform()
38 : m_type(SVG_TRANSFORM_UNKNOWN)
39 , m_angle(0)
40 {
41 }
42
SVGTransform(SVGTransformType type)43 SVGTransform::SVGTransform(SVGTransformType type)
44 : m_type(type)
45 , m_angle(0)
46 {
47 }
48
SVGTransform(const AffineTransform & matrix)49 SVGTransform::SVGTransform(const AffineTransform& matrix)
50 : m_type(SVG_TRANSFORM_MATRIX)
51 , m_angle(0)
52 , m_matrix(matrix)
53 {
54 }
55
setMatrix(const AffineTransform & matrix)56 void SVGTransform::setMatrix(const AffineTransform& matrix)
57 {
58 m_type = SVG_TRANSFORM_MATRIX;
59 m_angle = 0;
60 m_matrix = matrix;
61 }
62
updateMatrix()63 void SVGTransform::updateMatrix()
64 {
65 // The underlying matrix has been changed, alter the transformation type.
66 // Spec: In case the matrix object is changed directly (i.e., without using the methods on the SVGTransform interface itself)
67 // then the type of the SVGTransform changes to SVG_TRANSFORM_MATRIX.
68 m_type = SVG_TRANSFORM_MATRIX;
69 m_angle = 0;
70 }
71
setTranslate(float tx,float ty)72 void SVGTransform::setTranslate(float tx, float ty)
73 {
74 m_type = SVG_TRANSFORM_TRANSLATE;
75 m_angle = 0;
76
77 m_matrix.makeIdentity();
78 m_matrix.translate(tx, ty);
79 }
80
translate() const81 FloatPoint SVGTransform::translate() const
82 {
83 return FloatPoint::narrowPrecision(m_matrix.e(), m_matrix.f());
84 }
85
setScale(float sx,float sy)86 void SVGTransform::setScale(float sx, float sy)
87 {
88 m_type = SVG_TRANSFORM_SCALE;
89 m_angle = 0;
90 m_center = FloatPoint();
91
92 m_matrix.makeIdentity();
93 m_matrix.scaleNonUniform(sx, sy);
94 }
95
scale() const96 FloatSize SVGTransform::scale() const
97 {
98 return FloatSize::narrowPrecision(m_matrix.a(), m_matrix.d());
99 }
100
setRotate(float angle,float cx,float cy)101 void SVGTransform::setRotate(float angle, float cx, float cy)
102 {
103 m_type = SVG_TRANSFORM_ROTATE;
104 m_angle = angle;
105 m_center = FloatPoint(cx, cy);
106
107 // TODO: toString() implementation, which can show cx, cy (need to be stored?)
108 m_matrix.makeIdentity();
109 m_matrix.translate(cx, cy);
110 m_matrix.rotate(angle);
111 m_matrix.translate(-cx, -cy);
112 }
113
setSkewX(float angle)114 void SVGTransform::setSkewX(float angle)
115 {
116 m_type = SVG_TRANSFORM_SKEWX;
117 m_angle = angle;
118
119 m_matrix.makeIdentity();
120 m_matrix.skewX(angle);
121 }
122
setSkewY(float angle)123 void SVGTransform::setSkewY(float angle)
124 {
125 m_type = SVG_TRANSFORM_SKEWY;
126 m_angle = angle;
127
128 m_matrix.makeIdentity();
129 m_matrix.skewY(angle);
130 }
131
valueAsString() const132 String SVGTransform::valueAsString() const
133 {
134 switch (m_type) {
135 case SVG_TRANSFORM_UNKNOWN:
136 return String();
137 case SVG_TRANSFORM_MATRIX: {
138 StringBuilder builder;
139 builder.append(makeString("matrix(", String::number(m_matrix.a()), ' ', String::number(m_matrix.b()), ' ', String::number(m_matrix.c()), ' '));
140 builder.append(makeString(String::number(m_matrix.d()), ' ', String::number(m_matrix.e()), ' ', String::number(m_matrix.f()), ')'));
141 return builder.toString();
142 }
143 case SVG_TRANSFORM_TRANSLATE:
144 return makeString("translate(", String::number(m_matrix.e()), ' ', String::number(m_matrix.f()), ')');
145 case SVG_TRANSFORM_SCALE:
146 return makeString("scale(", String::number(m_matrix.xScale()), ' ', String::number(m_matrix.yScale()), ')');
147 case SVG_TRANSFORM_ROTATE: {
148 double angleInRad = deg2rad(m_angle);
149 double cosAngle = cos(angleInRad);
150 double sinAngle = sin(angleInRad);
151 float cx = narrowPrecisionToFloat(cosAngle != 1 ? (m_matrix.e() * (1 - cosAngle) - m_matrix.f() * sinAngle) / (1 - cosAngle) / 2 : 0);
152 float cy = narrowPrecisionToFloat(cosAngle != 1 ? (m_matrix.e() * sinAngle / (1 - cosAngle) + m_matrix.f()) / 2 : 0);
153 if (cx || cy)
154 return makeString("rotate(", String::number(m_angle), ' ', String::number(cx), ' ', String::number(cy), ')');
155 return makeString("rotate(", String::number(m_angle), ')');
156 }
157 case SVG_TRANSFORM_SKEWX:
158 return makeString("skewX(", String::number(m_angle), ')');
159 case SVG_TRANSFORM_SKEWY:
160 return makeString("skewY(", String::number(m_angle), ')');
161 }
162
163 ASSERT_NOT_REACHED();
164 return String();
165 }
166
167 } // namespace WebCore
168
169 #endif // ENABLE(SVG)
170