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kfontutils.cpp
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1/*********************************************************************************
2 * *
3 * Copyright (C) 2005, 2009 by Albert Astals Cid <aacid@kde.org> *
4 * *
5 * This library is free software; you can redistribute it and/or *
6 * modify it under the terms of the GNU Lesser General Public *
7 * License as published by the Free Software Foundation; either *
8 * version 2.1 of the License, or (at your option) version 3, or any *
9 * later version accepted by the membership of KDE e.V. (or its *
10 * successor approved by the membership of KDE e.V.), which shall *
11 * act as a proxy defined in Section 6 of version 3 of the license. *
12 * *
13 * This library is distributed in the hope that it will be useful, *
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
16 * Lesser General Public License for more details. *
17 * *
18 * You should have received a copy of the GNU Lesser General Public *
19 * License along with this library. If not, see <http://www.gnu.org/licenses/>. *
20 * *
21 *********************************************************************************/
22
23#include "kfontutils.h"
24
25#include <qpainter.h>
26
27qreal KFontUtils::adaptFontSize(QPainter &painter, const QString &string, qreal width, qreal height, qreal maxFontSize, qreal minFontSize, AdaptFontSizeOptions flags)
28{
29 qreal size = maxFontSize;
30 QRectF boundingRect;
31 bool done = false;
32
33 while (!done && size > minFontSize) {
34 QFont f = painter.font();
35 f.setPointSizeF(size);
36 painter.setFont(f);
37 int qtFlags = Qt::AlignCenter | Qt::TextWordWrap;
38 if (flags & DoNotAllowWordWrap) {
39 qtFlags = qtFlags & ~Qt::TextWordWrap;
40 }
41 boundingRect = painter.boundingRect(QRectF(0, 0, width, height), qtFlags, string);
42 if (boundingRect.width() == 0 || boundingRect.height() == 0) {
43 return -1;
44 } else if (boundingRect.width() > width || boundingRect.height() > height) {
45 size = qMin(width * size / boundingRect.width(), height * size / boundingRect.height());
46 } else {
47 done = true;
48 }
49 }
50
51 return size;
52}
53
54qreal KFontUtils::adaptFontSize(QPainter &painter, const QString &text, const QSizeF &availableSize, qreal maxFontSize, qreal minFontSize, AdaptFontSizeOptions flags)
55{
56 return adaptFontSize(painter, text, availableSize.width(), availableSize.height(), maxFontSize, minFontSize, flags);
57}
58
kfontutils.h
KFontUtils::adaptFontSize
qreal adaptFontSize(QPainter &painter, const QString &text, qreal width, qreal height, qreal maxFontSize=28.0, qreal minFontSize=1.0, AdaptFontSizeOptions flags=NoFlags)
Helper function that calculates the biggest font size (in points) used drawing a centered text using ...
Definition: kfontutils.cpp:27
KFontUtils::DoNotAllowWordWrap
@ DoNotAllowWordWrap
Definition: kfontutils.h:37
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