plasma-framework/paintutils.cpp

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/*
* Copyright 2005 by Aaron Seigo <aseigo@kde.org>
* Copyright 2008 by Andrew Lake <jamboarder@yahoo.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library General Public License as
* published by the Free Software Foundation; either version 2, or
* (at your option) any later version.
*
* This program 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 Library General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <paintutils.h>
#include <QImage>
#include <QPainter>
#include <QPixmap>
#include "effects/blur.cpp"
namespace Plasma
{
namespace PaintUtils
{
void shadowBlur(QImage &image, int radius, const QColor &color)
{
if (radius < 1)
return;
expblur<16, 7>(image, radius);
QPainter p(&image);
p.setCompositionMode(QPainter::CompositionMode_SourceIn);
p.fillRect(image.rect(), color);
p.end();
}
QPixmap shadowText(QString text, QColor textColor, QColor shadowColor, QPoint offset, int radius)
{
// Draw text
QFontMetrics fm(text);
QRect textRect = fm.boundingRect(text);
QPixmap textPixmap(textRect.size());
textPixmap.fill(Qt::transparent);
QPainter p(&textPixmap);
p.setPen(textColor);
p.drawText(textPixmap.rect(), Qt::AlignLeft, text);
p.end();
//Draw blurred shadow
QImage img(textRect.size() + QSize(radius * 2, radius * 2),
QImage::Format_ARGB32_Premultiplied);
img.fill(Qt::transparent);
p.begin(&img);
p.drawImage(QPoint(radius,radius), textPixmap.toImage());
p.end();
shadowBlur(img, radius, shadowColor);
//Compose text and shadow
int addSizeX;
int addSizeY;
if (offset.x() > radius) {
addSizeX = abs(offset.x()) - radius;
} else {
addSizeX = 0;
}
if (offset.y() > radius) {
addSizeY = abs(offset.y()) - radius;
} else {
addSizeY = 0;
}
QPixmap finalPixmap(img.size() + QSize(addSizeX, addSizeY));
finalPixmap.fill(Qt::transparent);
p.begin(&finalPixmap);
QPointF offsetF(offset);
QPointF textTopLeft(finalPixmap.rect().topLeft() +
QPointF ((finalPixmap.width() - textPixmap.width()) / 2.0, (finalPixmap.height() - textPixmap.height()) / 2.0) -
(offsetF / 2.0));
QPointF shadowTopLeft(finalPixmap.rect().topLeft() +
QPointF ((finalPixmap.width() - img.width()) / 2.0, (finalPixmap.height() - img.height()) / 2.0) +
(offsetF / 2.0));
p.drawImage(shadowTopLeft, img);
p.drawPixmap(textTopLeft, textPixmap);
p.end();
return finalPixmap;
}
QPainterPath roundedRectangle(const QRectF& rect, qreal radius)
{
QPainterPath path(QPointF(rect.left(), rect.top() + radius));
path.quadTo(rect.left(), rect.top(), rect.left() + radius, rect.top()); // Top left corner
path.lineTo(rect.right() - radius, rect.top()); // Top side
path.quadTo(rect.right(), rect.top(), rect.right(), rect.top() + radius); // Top right corner
path.lineTo(rect.right(), rect.bottom() - radius); // Right side
path.quadTo(rect.right(), rect.bottom(), rect.right() - radius, rect.bottom()); // Bottom right corner
path.lineTo(rect.left() + radius, rect.bottom()); // Bottom side
path.quadTo(rect.left(), rect.bottom(), rect.left(), rect.bottom() - radius); // Bottom left corner
path.closeSubpath();
return path;
}
} // PaintUtils namespace
} // Plasma namespace