summaryrefslogtreecommitdiffstats
path: root/src/qt3support/painting/q3painter.cpp
blob: f77034a9dd1868996b74c204635a0b6b3b637d2e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the Qt3Support module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "q3painter.h"
#include "qpaintengine.h"

#include <private/qpainter_p.h>

QT_BEGIN_NAMESPACE

/*!
    \class Q3Painter
    \brief The Q3Painter class is a Qt 3 compatibility wrapper for QPainter.

    \compat

    Prior to Qt 4, QPainter specialized the pen drawing for rectangle
    based functions (in particular: drawRect, drawEllipse,
    drawRoundRect, drawArc, drawChord and drawPie). When stroking a
    rectangle of width 10, the pen would draw a rectangle of width 10.
    Drawing a polygon defined by the corner points of the same
    rectangle the stroke would have a width of 11.

    The reason for this is best explained using the picture below:

    \img q3painter_rationale.png

    As we can see, stroking the rectangle so it gets a width of 10,
    means the pen is drawn on a rectangle on width 9. The polygon,
    however follows a consistent model.

    In Qt 4, all rectangle based functions have changed to follow the
    polygon approach, which means that the rectangle defines the size of
    the fill, and the pen follows the edges of the shape. For pen widths
    of 0 and 1 this means that the stroke will be inside the shape on the
    left and the top and outside on the bottom and right.

    The reason for the change in Qt 4 is so that we provide consistency
    for all drawing functions even with complex transformations.
*/

/*!
    \fn Q3Painter::Q3Painter()

    Constructs a Q3Painter.
*/

/*!
    \fn Q3Painter::Q3Painter(QPaintDevice *pdev)

    Constructs a Q3Painter that operates on device \a pdev.
*/

/*!
    \internal
*/
QRect Q3Painter::adjustedRectangle(const QRect &r)
{
    QRect rect = r.normalized();
    int subtract = d_func()->rectSubtraction();
    if (subtract != 0)
        rect.setSize(QSize(rect.width() - subtract, rect.height() - subtract));
    return rect;
}


/*!
    \fn void Q3Painter::drawRect(int x, int y, int w, int h)

    \overload

    Draws the rectangle that fits inside the bounds specified by \a x,
    \a y, \a w and \a h using the current pen and brush.
*/

/*!
    \fn void Q3Painter::drawRect(const QRect &r)

    Draws a rectangle that fits inside the rectangle \a r using the
    current pen and brush.

*/



/*!
    \fn Q3Painter::drawEllipse(const QRect &r)

    Draws the ellipse that fits inside the bounds \a r using the
    current pen and brush.

*/

/*!
    \fn Q3Painter::drawEllipse(int x, int y, int width, int height)

    \overload

    Draws an ellipse that fits inside the bounds specified by \a x,
    \a y, \a width and \a height using the current pen and brush.

*/

/*!
    \fn void Q3Painter::drawPie(int x, int y, int w, int h, int
    startAngle, int spanAngle)

    \overload

    Draws a pie segment that fits inside the bounds (\a{x}, \a{y},
    \a{w}, \a{h}) with the given \a startAngle and \a spanAngle.
*/

/*!
    \fn void Q3Painter::drawPie(const QRect &r, int a, int alen)

    Draws a pie defined by the rectangle \a r, the start angle \a a
    and the arc length \a alen.

    The pie is filled with the current brush().

    The angles \a a and \a alen are 1/16th of a degree, i.e. a full
    circle equals 5760 (16*360). Positive values of \a a and \a alen
    mean counter-clockwise while negative values mean the clockwise
    direction. Zero degrees is at the 3 o'clock position.

    \sa drawArc(), drawChord()
*/

/*!
    \fn void Q3Painter::drawArc(int x, int y, int w, int h, int
    startAngle, int spanAngle)

    \overload

    Draws the arc that fits inside the rectangle (\a{x}, \a{y}, \a{w},
    \a{h}), with the given \a startAngle and \a spanAngle.
*/

/*!
    \fn void Q3Painter::drawArc(const QRect &r, int a, int alen)

    Draws an arc defined by the rectangle \a r, the start angle \a a
    and the arc length \a alen.

    The angles \a a and \a alen are 1/16th of a degree, i.e. a full
    circle equals 5760 (16*360). Positive values of \a a and \a alen
    mean counter-clockwise while negative values mean the clockwise
    direction. Zero degrees is at the 3 o'clock position.

    Example:
    \snippet doc/src/snippets/code/src_qt3support_painting_q3painter.cpp 0

    \sa drawPie(), drawChord()
*/

/*!
    \fn void Q3Painter::drawChord(int x, int y, int w, int h, int
    startAngle, int spanAngle)

    \overload

    Draws a chord that fits inside the rectangle (\a{x}, \a{y}, \a{w},
    \a{h}) with the given \a startAngle and \a spanAngle.
*/


/*!
    \fn void Q3Painter::drawChord(const QRect &r, int a, int alen)

    Draws a chord defined by the rectangle \a r, the start angle \a a
    and the arc length \a alen.

    The chord is filled with the current brush().

    The angles \a a and \a alen are 1/16th of a degree, i.e. a full
    circle equals 5760 (16*360). Positive values of \a a and \a alen
    mean counter-clockwise while negative values mean the clockwise
    direction. Zero degrees is at the 3 o'clock position.

    \sa drawArc(), drawPie()
*/

/*!
    \fn void Q3Painter::drawRoundRect(const QRect &r, int xrnd, int yrnd)

    Draws a rounded rect that fits into the bounds \a r using the current
    pen and brush. The parameters \a xrnd and \a yrnd specifies the roundness
    in x and y direction.
*/

/*!
    \fn void Q3Painter::drawRoundRect(int x, int y, int w, int h, int xrnd, int yrnd)

    \overload

    Draws a rounded rect that fits into the bounds \a x, \a y, \a w
    and \a h using the current pen and brush. The parameters \a xrnd
    and \a yrnd specifies the roundness in x and y direction.
*/

QT_END_NAMESPACE