displayshape.cpp Example File
tools/qtdemo/displayshape.cpp
/****************************************************************************
**
** Copyright (C) 2005-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the documentation of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 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 GNU
** General Public Licensing requirements will be met:
** http://www.trolltech.com/products/qt/opensource.html
**
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** review the following information:
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** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/
#include <math.h>
#include <QtGui>
#include "displayshape.h"
DisplayShape::DisplayShape(const QPointF &position, const QSizeF &maxSize)
: pos(position), maxSize(maxSize), interactive(false)
{
}
bool DisplayShape::animate()
{
if (!targetPos.isNull()) {
QLineF displacement(pos, targetPos);
QPointF newPosition = displacement.pointAt(0.25);
if (displacement.length() <= 1.0) {
pos = targetPos;
targetPos = QPointF();
} else {
pos = newPosition;
}
return true;
}
return false;
}
bool DisplayShape::contains(const QString &key) const
{
return meta.contains(key);
}
bool DisplayShape::isInteractive() const
{
return interactive;
}
QVariant DisplayShape::metaData(const QString &key) const
{
return meta.value(key);
}
void DisplayShape::paint(QPainter *painter) const
{
painter->save();
painter->drawImage(pos, image);
painter->restore();
}
QPointF DisplayShape::position() const
{
return pos;
}
QRectF DisplayShape::rect() const
{
return QRectF(pos, image.size());
}
void DisplayShape::removeMetaData(const QString &key)
{
meta.remove(key);
}
void DisplayShape::setInteractive(bool enable)
{
interactive = enable;
}
void DisplayShape::setMetaData(const QString &key, const QVariant &value)
{
meta[key] = value;
}
void DisplayShape::setPosition(const QPointF &position)
{
pos = position;
}
void DisplayShape::setSize(const QSizeF &size)
{
maxSize = size;
}
void DisplayShape::setTarget(const QPointF &position)
{
targetPos = position;
}
QSizeF DisplayShape::size() const
{
return maxSize;
}
QPointF DisplayShape::target() const
{
return targetPos;
}
PanelShape::PanelShape(const QPainterPath &path, const QBrush &normal,
const QBrush &highlighted, const QPen &pen,
const QPointF &position, const QSizeF &maxSize)
: DisplayShape(position, maxSize), highlightedBrush(highlighted),
normalBrush(normal), path(path), pen(pen)
{
brush = normalBrush;
}
bool PanelShape::animate()
{
bool updated = false;
if (!meta.contains("destroy")) {
if (meta.contains("fade")) {
QColor penColor = pen.color();
QColor brushColor = brush.color();
int penAlpha = penColor.alpha();
int brushAlpha = brushColor.alpha();
int fadeMinimum = meta.value("fade minimum").toInt();
if (penAlpha != fadeMinimum || brushAlpha != fadeMinimum
|| meta.value("fade").toInt() > 0) {
penAlpha = qBound(fadeMinimum,
penAlpha + meta.value("fade").toInt(), 255);
brushAlpha = qBound(fadeMinimum,
brushAlpha + meta.value("fade").toInt(), 255);
penColor.setAlpha(penAlpha);
brushColor.setAlpha(brushAlpha);
pen.setColor(penColor);
brush.setColor(brushColor);
if (penAlpha == 0 && brushAlpha == 0) {
meta["destroy"] = true;
meta.remove("fade");
} else if (penAlpha == 255 && brushAlpha == 255)
meta.remove("fade");
updated = true;
}
} else if (meta.contains("highlight")) {
qreal scale = meta.value("highlight scale").toDouble();
QColor color = brush.color();
if (meta.value("highlight").toBool())
scale = qBound(0.0, scale + 0.5, 1.0);
else
scale = qBound(0.0, scale - 0.2, 1.0);
if (scale == 0.0) {
brush = normalBrush;
meta.remove("highlight");
meta.remove("highlight scale");
updated = true;
} else if (scale != meta["highlight scale"]) {
meta["highlight scale"] = scale;
if (scale == 1.0)
brush = highlightedBrush;
else {
QColor normal = normalBrush.color();
QColor highlighted = highlightedBrush.color();
color.setRedF((1.0-scale) * normal.redF()
+ scale*highlighted.redF());
color.setGreenF((1.0-scale) * normal.greenF()
+ scale*highlighted.greenF());
color.setBlueF((1.0-scale) * normal.blueF()
+ scale*highlighted.blueF());
brush.setColor(color);
}
updated = true;
}
}
}
return DisplayShape::animate() || updated;
}
void PanelShape::paint(QPainter *painter) const
{
painter->save();
painter->setRenderHint(QPainter::Antialiasing);
painter->setBrush(brush);
painter->setPen(pen);
painter->translate(pos);
painter->drawPath(path);
painter->restore();
}
QRectF PanelShape::rect() const
{
return QRectF(pos + path.boundingRect().topLeft(),
path.boundingRect().size());
}
TitleShape::TitleShape(const QString &text, const QFont &f,
const QPen &pen, const QPointF &position,
const QSizeF &maxSize, Qt::Alignment alignment)
: DisplayShape(position, maxSize), font(f), text(text), pen(pen),
alignment(alignment)
{
QFontMetricsF fm(font);
textRect = fm.boundingRect(QRectF(QPointF(0, 0), maxSize), alignment, text);
qreal textWidth = qMax(fm.width(text), textRect.width());
qreal textHeight = qMax(fm.height(), textRect.height());
qreal scale = qMin(maxSize.width()/textWidth,
maxSize.height()/textHeight);
font.setPointSizeF(font.pointSizeF() * scale);
fm = QFontMetricsF(font);
textRect = fm.boundingRect(QRectF(QPointF(0, 0), maxSize), alignment, text);
baselineStart = QPointF(textRect.left(), textRect.bottom() - fm.descent());
}
bool TitleShape::animate()
{
bool updated = false;
if (!meta.contains("destroy")) {
if (meta.contains("fade")) {
QColor penColor = pen.color();
int penAlpha = penColor.alpha();
penAlpha = qBound(meta.value("fade minimum").toInt(),
penAlpha + meta.value("fade").toInt(), 255);
penColor.setAlpha(penAlpha);
pen.setColor(penColor);
if (penAlpha == 0) {
meta["destroy"] = true;
meta.remove("fade");
} else if (penAlpha == 255)
meta.remove("fade");
updated = true;
}
}
return DisplayShape::animate() || updated;
}
void TitleShape::paint(QPainter *painter) const
{
QRectF rect(textRect);
rect.translate(pos);
painter->save();
painter->setRenderHint(QPainter::TextAntialiasing);
painter->setPen(pen);
painter->setFont(font);
painter->drawText(pos + baselineStart, text);
painter->restore();
}
QRectF TitleShape::rect() const
{
QRectF rect(textRect);
return rect.translated(pos);
}
ImageShape::ImageShape(const QImage &original, const QPointF &position,
const QSizeF &maxSize, int alpha,
Qt::Alignment alignment)
: DisplayShape(position, maxSize), alpha(alpha), alignment(alignment)
{
source = original.convertToFormat(QImage::Format_ARGB32_Premultiplied);
qreal scale = qMin(qMin(maxSize.width()/source.width(),
maxSize.height()/source.height()), qreal(1.0));
source = source.scaled(int(ceil(source.width() * scale)),
int(ceil(source.height() * scale)),
Qt::KeepAspectRatio,
Qt::SmoothTransformation);
image = QImage(source.size(), QImage::Format_ARGB32_Premultiplied);
offset = QPointF(0.0, 0.0);
if (alignment & Qt::AlignHCenter)
offset.setX((maxSize.width() - image.width())/2);
else if (alignment & Qt::AlignRight)
offset.setX(maxSize.width() - image.width());
if (alignment & Qt::AlignVCenter)
offset.setY((maxSize.height() - image.height())/2);
else if (alignment & Qt::AlignBottom)
offset.setY(maxSize.height() - image.height());
redraw();
}
void ImageShape::redraw()
{
image.fill(qRgba(alpha, alpha, alpha, alpha));
QPainter painter;
painter.begin(&image);
painter.setCompositionMode(QPainter::CompositionMode_SourceIn);
painter.drawImage(0, 0, source);
painter.end();
}
void ImageShape::paint(QPainter *painter) const
{
painter->drawImage(pos + offset, image);
}
QRectF ImageShape::rect() const
{
return QRectF(pos, maxSize);
}
bool ImageShape::animate()
{
bool updated = false;
if (!meta.contains("destroy")) {
if (meta.contains("fade")) {
alpha = qBound(meta.value("fade minimum").toInt(),
alpha + meta.value("fade").toInt(), 255);
redraw();
if (alpha == 0) {
meta["destroy"] = true;
meta.remove("fade");
} else if (alpha == 255)
meta.remove("fade");
updated = true;
}
}
return DisplayShape::animate() || updated;
}
DocumentShape::DocumentShape(const QString &text, const QFont &font,
const QPointF &position, const QSizeF &maxSize,
int alpha)
: DisplayShape(position, maxSize), alpha(alpha)
{
textDocument.setHtml(text);
textDocument.setDefaultFont(font);
textDocument.setPageSize(maxSize);
QSizeF documentSize = textDocument.documentLayout()->documentSize();
setSize(QSizeF(maxSize.width(),
qMin(maxSize.height(), documentSize.height())));
source = QImage(int(ceil(documentSize.width())),
int(ceil(documentSize.height())),
QImage::Format_ARGB32_Premultiplied);
source.fill(qRgba(255, 255, 255, 255));
QAbstractTextDocumentLayout::PaintContext context;
textDocument.documentLayout()->setPaintDevice(&source);
QPainter painter;
painter.begin(&source);
painter.setRenderHint(QPainter::TextAntialiasing);
painter.setRenderHint(QPainter::Antialiasing);
textDocument.documentLayout()->draw(&painter, context);
painter.end();
source = source.scaled(int(ceil(maxSize.width())),
int(ceil(maxSize.height())),
Qt::KeepAspectRatio,
Qt::SmoothTransformation);
image = QImage(source.size(), source.format());
redraw();
}
DocumentShape::~DocumentShape()
{
}
bool DocumentShape::animate()
{
bool updated = false;
if (!meta.contains("destroy")) {
if (meta.contains("fade")) {
alpha = qBound(meta.value("fade minimum").toInt(),
alpha + meta.value("fade").toInt(), 255);
redraw();
if (alpha == 0) {
meta["destroy"] = true;
meta.remove("fade");
} else if (alpha == 255)
meta.remove("fade");
updated = true;
}
}
return DisplayShape::animate() || updated;
}
void DocumentShape::redraw()
{
image.fill(qRgba(alpha, alpha, alpha, alpha));
QPainter painter;
painter.begin(&image);
painter.setCompositionMode(QPainter::CompositionMode_SourceIn);
painter.drawImage(0, 0, source);
painter.end();
}
void DocumentShape::paint(QPainter *painter) const
{
painter->drawImage(pos, image);
}
QRectF DocumentShape::rect() const
{
return QRectF(pos, maxSize);
}
