drop onGameTick20 - it has some savings on cpu, but racers demand millisecond precision not 20 millisecond, apparently
#include <QDebug>
#include <QGraphicsSceneMouseEvent>
#include <QGraphicsPathItem>
#include <QtEndian>
#include "drawmapscene.h"
template <class T> T sqr(const T & x)
{
return x*x;
}
DrawMapScene::DrawMapScene(QObject *parent) :
QGraphicsScene(parent),
m_pen(Qt::yellow),
m_brush(Qt::yellow)
{
setSceneRect(0, 0, 4096, 2048);
QLinearGradient gradient(0, 0, 0, 2048);
gradient.setColorAt(0, QColor(60, 60, 155));
gradient.setColorAt(1, QColor(155, 155, 60));
setBackgroundBrush(QBrush(gradient));
m_pen.setWidth(67);
m_pen.setJoinStyle(Qt::RoundJoin);
m_pen.setCapStyle(Qt::RoundCap);
m_currPath = 0;
}
void DrawMapScene::mouseMoveEvent(QGraphicsSceneMouseEvent * mouseEvent)
{
qDebug() << "move" << mouseEvent->scenePos();
if(m_currPath && (mouseEvent->buttons() & Qt::LeftButton))
{
QPainterPath path = m_currPath->path();
path.lineTo(mouseEvent->scenePos());
paths.first().append(mouseEvent->scenePos().toPoint());
m_currPath->setPath(path);
emit pathChanged();
}
}
void DrawMapScene::mousePressEvent(QGraphicsSceneMouseEvent * mouseEvent)
{
qDebug() << "press" << mouseEvent->scenePos();
m_currPath = addPath(QPainterPath(), m_pen);
QPainterPath path = m_currPath->path();
QPointF p = mouseEvent->scenePos();
p += QPointF(0.01, 0.01);
path.moveTo(p);
path.lineTo(mouseEvent->scenePos());
paths.prepend(QList<QPoint>() << mouseEvent->scenePos().toPoint());
m_currPath->setPath(path);
emit pathChanged();
}
void DrawMapScene::mouseReleaseEvent(QGraphicsSceneMouseEvent * mouseEvent)
{
qDebug() << "release" << mouseEvent->scenePos();
simplifyLast();
m_currPath = 0;
}
void DrawMapScene::undo()
{
if(items().size())
{
removeItem(items().first());
paths.removeFirst();
emit pathChanged();
}
}
QByteArray DrawMapScene::encode()
{
QByteArray b;
foreach(QList<QPoint> points, paths)
{
int cnt = 0;
foreach(QPoint point, points)
{
qint16 px = qToBigEndian((qint16)point.x());
qint16 py = qToBigEndian((qint16)point.y());
quint8 flags = 2;
if(!cnt) flags |= 0x80;
b.append((const char *)&px, 2);
b.append((const char *)&py, 2);
b.append((const char *)&flags, 1);
++cnt;
}
}
return b;
}
void DrawMapScene::decode(QByteArray data)
{
clear();
paths.clear();
QList<QPoint> points;
while(data.size() >= 5)
{
qint16 px = qFromBigEndian(*(qint16 *)data.data());
data.remove(0, 2);
qint16 py = qFromBigEndian(*(qint16 *)data.data());
data.remove(0, 2);
quint8 flags = *(quint8 *)data.data();
data.remove(0, 1);
//last chunk or first point
if((data.size() < 5) || (flags & 0x80))
{
if(points.size())
{
qDebug() << points;
addPath(pointsToPath(points), m_pen);
paths.prepend(points);
points.clear();
}
}
points.append(QPoint(px, py));
}
}
void DrawMapScene::simplifyLast()
{
QList<QPoint> points = paths[0];
QPoint prevPoint = points.first();
int i = 1;
while(i < points.size())
{
if( (i != points.size() - 1)
&& (sqr(prevPoint.x() - points[i].x()) + sqr(prevPoint.y() - points[i].y()) < 1000)
)
points.removeAt(i);
else
{
prevPoint = points[i];
++i;
}
}
paths[0] = points;
// redraw path
{
QGraphicsPathItem * pathItem = static_cast<QGraphicsPathItem *>(items()[0]);
pathItem->setPath(pointsToPath(paths[0]));
}
emit pathChanged();
}
QPainterPath DrawMapScene::pointsToPath(const QList<QPoint> points)
{
QPainterPath path;
if(points.size())
{
QPointF p = points[0] + QPointF(0.01, 0.01);
path.moveTo(p);
foreach(QPoint p, points)
path.lineTo(p);
}
return path;
}