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demotextitem.cpp 3.68 KiB
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/****************************************************************************
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**
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** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/legal
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**
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** This file is part of the demonstration applications of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL21$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Digia. For licensing terms and
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** conditions see http://qt.digia.com/licensing. For further information
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** use the contact form at http://qt.digia.com/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 or version 3 as published by the Free
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** Software Foundation and appearing in the file LICENSE.LGPLv21 and
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** LICENSE.LGPLv3 included in the packaging of this file. Please review the
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** following information to ensure the GNU Lesser General Public License
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** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Digia gives you certain additional
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** rights. These rights are described in the Digia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "demotextitem.h"
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#include "colors.h"
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DemoTextItem::DemoTextItem(const QString &text, const QFont &font, const QColor &textColor,
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                           float textWidth, QGraphicsScene *scene, QGraphicsItem *parent, TYPE type, const QColor &bgColor)
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                           : DemoItem(scene, parent)
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{
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    this->type = type;
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    this->text = text;
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    this->font = font;
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    this->textColor = textColor;
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    this->bgColor = bgColor;
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    this->textWidth = textWidth;
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    this->noSubPixeling = true;
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}
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void DemoTextItem::setText(const QString &text)
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{
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    this->text = text;
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    this->update();
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}
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QImage *DemoTextItem::createImage(const QMatrix &matrix) const
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{
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    if (this->type == DYNAMIC_TEXT)
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        return 0;
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    float sx = qMin(matrix.m11(), matrix.m22());
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    float sy = matrix.m22() < sx ? sx : matrix.m22();
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    QGraphicsTextItem textItem(0, 0);
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    textItem.setHtml(this->text);
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    textItem.setTextWidth(this->textWidth);
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    textItem.setFont(this->font);
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    textItem.setDefaultTextColor(this->textColor);
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    textItem.document()->setDocumentMargin(2);
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float w = textItem.boundingRect().width(); float h = textItem.boundingRect().height(); QImage *image = new QImage(int(w * sx), int(h * sy), QImage::Format_ARGB32_Premultiplied); image->fill(QColor(0, 0, 0, 0).rgba()); QPainter painter(image); painter.scale(sx, sy); QStyleOptionGraphicsItem style; textItem.paint(&painter, &style, 0); return image; } void DemoTextItem::animationStarted(int) { this->noSubPixeling = false; } void DemoTextItem::animationStopped(int) { this->noSubPixeling = true; } QRectF DemoTextItem::boundingRect() const { if (this->type == STATIC_TEXT) return DemoItem::boundingRect(); return QRectF(0, 0, 50, 20); // Sorry for using magic number } void DemoTextItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) { Q_UNUSED(option); Q_UNUSED(widget); if (this->type == STATIC_TEXT) { DemoItem::paint(painter, option, widget); return; } painter->setPen(this->textColor); painter->drawText(0, 0, this->text); }