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textobject.cpp
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textobject.cpp
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/* YUView - YUV player with advanced analytics toolset
* Copyright (C) 2015 Institut für Nachrichtentechnik
* RWTH Aachen University, GERMANY
*
* YUView is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* YUView is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with YUView. If not, see <http://www.gnu.org/licenses/>.
*/
#include "textobject.h"
TextObject::TextObject(QString displayString, QObject* parent) : DisplayObject(parent)
{
p_TextString = displayString;
p_TextFont = QFont("Arial", 12);
p_TextColor = QColor(Qt::white);
setDuration(5);
refreshTextSize();
}
TextObject::~TextObject()
{
}
void TextObject::loadImage(int frameIdx)
{
if (frameIdx==INT_INVALID || p_TextString.isEmpty() || frameIdx >= numFrames())
{
p_displayImage = QPixmap();
return;
}
// else
drawText();
}
void TextObject::drawText()
{
// create new display image
QImage tmpImage(p_width,p_height,QImage::Format_ARGB32);
tmpImage.fill(qRgba(0, 0, 0, 0)); // clear with transparent color
p_displayImage.convertFromImage(tmpImage);
// draw text
QPainter currentPainter(&p_displayImage);
currentPainter.setRenderHint(QPainter::TextAntialiasing);
currentPainter.setRenderHint(QPainter::Antialiasing);
currentPainter.setPen(p_TextColor);
currentPainter.setFont(p_TextFont);
currentPainter.drawText(p_displayImage.rect(), Qt::AlignCenter, p_TextString);
}
void TextObject::refreshTextSize()
{
// estimate size of text to be rendered
QFontMetrics fm(p_TextFont);
int width = fm.width(p_TextString);
int height = fm.height()*(p_TextString.count("\n")+1);
setWidth(width);
setHeight(height);
}