KHtml

SVGPaintServerRadialGradientQt.cpp
1 /*
2  Copyright (C) 2006 Nikolas Zimmermann <[email protected]>
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 
38 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 
qreal top() const const
qreal left() const const
qreal width() const const
qreal height() const const
const QMatrix & matrix() const const
QMatrix & scale(qreal sx, qreal sy)
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