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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (qt-info@nokia.com)
**
** This file is part of the Graphics Dojo project on Qt Labs.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 or 3.0 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.fsf.org/licensing/licenses/info/GPLv2.html and
** http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at qt-sales@nokia.com.
**
** 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 <QtCore>
#include <QtGui>
#include <QtNetwork>
#include <QtScript>
#define MONSTER_JS_URL "http://deanm.github.com/pre3d/monster.js"
#if defined(Q_WS_MAC)
#define MONSTER_OFFSCREEN
#endif
struct PaintCommand {
qreal opacity;
QPen stroke;
QBrush fill;
QPolygonF polygon;
};
static inline QColor parseColor(const QString &name)
{
if (name == "none")
return QColor();
if (name.startsWith("rgba(")) {
int start = name.indexOf('(');
int end = name.indexOf(')', start + 2);
QString substr = name.mid(start + 1, end - start - 1);
QStringList colors = substr.trimmed().split(',');
if (colors.count() == 4) {
int r = colors[0].toInt();
int g = colors[1].toInt();
int b = colors[2].toInt();
int a = qMax(0, static_cast<int>(colors[3].toDouble() * 255));
return QColor(r, g, b, a);
}
}
return QColor(name);
}
static QScriptValue drawPolygons(QScriptContext *context, QScriptEngine *engine);
class QSMonster : public QWidget
{
Q_OBJECT
private:
QScriptEngine *engine;
QNetworkAccessManager *manager;
#ifdef MONSTER_OFFSCREEN
QPixmap pixmap;
#endif
public:
QVector<PaintCommand> commandBuffer;
int fps;
QSMonster(QWidget *parent = 0): QWidget(parent), fps(0) {
engine = new QScriptEngine(this);
engine->globalObject().setProperty("drawPolygons", engine->newFunction(drawPolygons, 2));
manager = new QNetworkAccessManager(this);
connect(manager, SIGNAL(finished(QNetworkReply*)), SLOT(start(QNetworkReply*)));
QUrl url(MONSTER_JS_URL);
QNetworkReply *reply = manager->get(QNetworkRequest(url));
connect(reply, SIGNAL(downloadProgress(qint64, qint64)), SLOT(progress(qint64, qint64)));
setWindowTitle(QString("About to download %1").arg(MONSTER_JS_URL));
#ifdef MONSTER_OFFSCREEN
pixmap = QPixmap(800, 600);
pixmap.fill(Qt::black);
#endif
}
public slots:
void progress(qint64 received, qint64 total) {
int percent = received * 100 / total;
setWindowTitle(QString("Downloading %1: %2%").arg(MONSTER_JS_URL).arg(percent));
}
void start(QNetworkReply *networkReply) {
QUrl url = networkReply->url();
if (networkReply->error()) {
setWindowTitle(QString("Can't download %1: %2").arg(url.toString())
.arg(networkReply->errorString()));
} else {
setWindowTitle("Monster Evolution in Qt");
setAttribute(Qt::WA_OpaquePaintEvent, true);
QFile file;
file.setFileName(":/magic.js");
file.open(QIODevice::ReadOnly);
QString magicCode = file.readAll();
file.close();
engine->evaluate(magicCode);
QString scriptCode = networkReply->readAll();
// Qt Script parser does not accept this
#if QT_VERSION < 0x040500
scriptCode.replace(",}", "}");
#else
scriptCode.replace("break}", "break;}");
scriptCode.replace("continue}", "continue;}");
#endif
engine->evaluate(scriptCode);
engine->evaluate("window.onLoad()");
startTimer(33);
}
networkReply->deleteLater();
}
protected:
void timerEvent(QTimerEvent*) {
engine->evaluate("window.onTimer()");
}
void paintEvent(QPaintEvent*) {
QPainter p;
#ifdef MONSTER_OFFSCREEN
p.begin(&pixmap);
#else
p.begin(this);
#endif
p.setRenderHint(QPainter::Antialiasing, true);
const PaintCommand *cmd = commandBuffer.constData();
int count = commandBuffer.count();
for (int i = 0; i < count; ++i, ++cmd) {
p.setPen(cmd->stroke);
p.setOpacity(cmd->opacity);
p.setBrush(cmd->fill);
p.drawPolygon(cmd->polygon);
}
p.setPen(Qt::white);
p.drawText(10, 600 - 20, QString("%1 FPS").arg(fps));
p.end();
#ifdef MONSTER_OFFSCREEN
p.begin(this);
p.drawPixmap(0,0, pixmap);
p.end();
#endif
}
};
static QScriptValue drawPolygons(QScriptContext *context, QScriptEngine *engine)
{
QSMonster *qsmonster = static_cast<QSMonster*>(engine->parent());
int polygonCount = context->argument(0).toInt32();
QScriptValue polygonBuffer = context->argument(1);
qsmonster->commandBuffer.resize(polygonCount);
for (int c = 0; c < polygonCount; ++c) {
QScriptValue cmd = polygonBuffer.property(c);
qreal alpha = cmd.property(0).toNumber();
QString strokeColor = cmd.property(1).toString();
QString fillColor = cmd.property(2).toString();
int pointCount = cmd.property(3).toInt32();
QScriptValue pointArray = cmd.property(4);
QPolygonF polygon(pointCount / 2);
for (int p = 0; p < pointCount / 2; ++p) {
polygon[p] = QPointF(pointArray.property(2 * p).toNumber(),
pointArray.property(2 * p + 1).toNumber());
}
PaintCommand *paint = qsmonster->commandBuffer.data() + c;
paint->opacity = alpha;
paint->stroke = QPen(Qt::NoPen);
if (strokeColor != "none") {
paint->stroke.setStyle(Qt::SolidLine);
paint->stroke.setColor(parseColor(strokeColor));
}
paint->fill = QBrush(Qt::NoBrush);
if (fillColor != "none")
paint->fill = QBrush(parseColor(fillColor));
paint->polygon = polygon;
}
qsmonster->update();
static QTime frameTick;
static int totalFrame = 0;
if (!(totalFrame & 15)) {
int elapsed = frameTick.elapsed();
frameTick.start();
qsmonster->fps = 16 * 1000 / (1 + elapsed);
}
totalFrame++;
return QScriptValue();
}
#include "qsmonster.moc"
int main(int argc, char **argv)
{
Q_INIT_RESOURCE(qsmonster);
QApplication app(argc, argv);
QSMonster qsmonster;
qsmonster.setFixedSize(800, 600);
qsmonster.show();
return app.exec();
}
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