1 /*
2 Copyright (C) 2006 Nikolas Zimmermann <wildfox@kde.org>
3
4 This file is part of the KDE project
5
6 This library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Library General Public
8 License as published by the Free Software Foundation; either
9 version 2 of the License, or (at your option) any later version.
10
11 This library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Library General Public License for more details.
15
16 You should have received a copy of the GNU Library General Public License
17 aint with this library; see the file COPYING.LIB. If not, write to
18 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
19 Boston, MA 02110-1301, USA.
20 */
21
22 #include "wtf/Platform.h"
23
24 #if ENABLE(SVG)
25 #include "SVGPaintServerRadialGradient.h"
26
27 /*#include "GraphicsContext.h"*/
28 #include "RenderPath.h"
29
30 #include <math.h>
31 #include <QPainter>
32 #include <QPainterPath>
33 #include <QRadialGradient>
34
35 namespace WebCore
36 {
37
setupGradient(QPainter * painter,QPainterPath * painterPath,const RenderObject * object) const38 QGradient SVGPaintServerRadialGradient::setupGradient(QPainter *painter, QPainterPath *painterPath, const RenderObject *object) const
39 {
40 Q_UNUSED(object);
41 //QPainter* painter(context ? context->platformContext() : 0);
42 //Q_ASSERT(painter);
43
44 //QPainterPath* path(context ? context->currentPath() : 0);
45 //Q_ASSERT(path);
46 QPainterPath *path(painterPath);
47
48 //RenderStyle* renderStyle = object->style();
49
50 QMatrix mat = painter->matrix();
51
52 double cx, fx, cy, fy, r;
53 if (boundingBoxMode()) {
54 QRectF bbox = path->boundingRect();
55 cx = double(bbox.left()) + (double(gradientCenter().x() / 100.0) * double(bbox.width()));
56 cy = double(bbox.top()) + (double(gradientCenter().y() / 100.0) * double(bbox.height()));
57 fx = double(bbox.left()) + (double(gradientFocal().x() / 100.0) * double(bbox.width())) - cx;
58 fy = double(bbox.top()) + (double(gradientFocal().y() / 100.0) * double(bbox.height())) - cy;
59 r = double(gradientRadius() / 100.0) * (sqrt(pow(bbox.width(), 2) + pow(bbox.height(), 2)));
60
61 float width = bbox.width();
62 float height = bbox.height();
63
64 int diff = int(width - height); // allow slight tolerance
65 if (!(diff > -2 && diff < 2)) {
66 // make elliptical or circular depending on bbox aspect ratio
67 float ratioX = (width / height);
68 float ratioY = (height / width);
69 mat.scale((width > height) ? 1 : ratioX, (width > height) ? ratioY : 1);
70 }
71 } else {
72 cx = gradientCenter().x();
73 cy = gradientCenter().y();
74
75 fx = gradientFocal().x();
76 fy = gradientFocal().y();
77
78 fx -= cx;
79 fy -= cy;
80
81 r = gradientRadius();
82 }
83
84 if (sqrt(fx * fx + fy * fy) > r) {
85 // Spec: If (fx, fy) lies outside the circle defined by (cx, cy) and r, set (fx, fy)
86 // to the point of intersection of the line through (fx, fy) and the circle.
87 double angle = atan2(fy, fx);
88 fx = int(cos(angle) * r) - 1;
89 fy = int(sin(angle) * r) - 1;
90 }
91
92 // qCDebug(KHTML_LOG) << "cx:" << cx << "cy:" << cy << "radius:" << gradientRadius() << "fx:" << fx + cx << "fy:" << fy + cy;
93 QRadialGradient gradient(QPointF(cx, cy), gradientRadius(), QPointF(fx + cx, fy + cy));
94
95 return gradient;
96 }
97
98 } // namespace WebCore
99
100 #endif
101
102