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/*
Copyright (C) 2002-2005, Jason Katz-Brown <jasonkb@mit.edu>
Copyright 2010 Stefan Majewsky <majewsky@gmx.net>
This program 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.
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 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 "ball.h"
#include "game.h"
#include "overlay.h"
#include "shape.h"
#include <QApplication>
Ball::Ball(QGraphicsItem* parent, b2World* world)
: EllipticalCanvasItem(true, QStringLiteral("ball"), parent, world)
{
const int diameter = 8;
setSize(QSizeF(diameter, diameter));
setZBehavior(CanvasItem::IsRaisedByStrut, 10);
setData(0, Rtti_NoCollision);
m_doDetect = true;
setBeginningOfHole(false);
m_collisionId = 0;
m_addStroke = false;
m_placeOnGround = false;
m_forceStillGoing = false;
frictionMultiplier = 1.0;
QFont font(QApplication::font());
font.setPixelSize(12);
label = new QGraphicsSimpleTextItem(QString(), this);
label->setFont(font);
label->setBrush(Qt::white);
label->setPos(5, 5);
label->setVisible(false);
// this sets z
setState(Stopped);
}
void Ball::setState(BallState newState)
{
state = newState;
if (state == Holed || !EllipticalCanvasItem::isVisible())
setSimulationType(CanvasItem::NoSimulation);
else
setSimulationType(CanvasItem::DynamicSimulation);
if (state != Stopped)
setBeginningOfHole(false);
}
void Ball::friction()
{
if (state == Stopped || state == Holed || !isVisible())
{
setVelocity(QPointF());
return;
}
const double subtractAmount = .027 * frictionMultiplier;
Vector velocity = this->velocity();
if (velocity.magnitude() <= subtractAmount)
{
state = Stopped;
setVelocity(QPointF());
game->timeout();
return;
}
velocity.setMagnitude(velocity.magnitude() - subtractAmount);
setVelocity(velocity);
frictionMultiplier = 1.0;
}
void Ball::moveBy(double dx, double dy)
{
EllipticalCanvasItem::moveBy(dx, dy);
if (game && !game->isPaused())
collisionDetect();
if ((dx || dy) && game && game->curBall() == this)
game->ballMoved();
}
void Ball::endSimulation()
{
CanvasItem::endSimulation();
if (state == Stopped)
if (!qFuzzyIsNull(Vector(velocity()).magnitude()))
//ball was resting, but received some momentum from collision with other ball
setState(Rolling);
}
void Ball::collisionDetect()
{
if (!isVisible() || state == Holed || !m_doDetect)
return;
// do friction every other time
m_collisionId = (m_collisionId + 1) % 2;
if (m_collisionId == 1 && !velocity().isNull())
friction();
const double initialVelocity = Vector(velocity()).magnitude();
const double minSpeed = .06;
QList<QGraphicsItem *> items = collidingItems();
bool doTerrainCollisions = true;
foreach (QGraphicsItem* item, items)
{
if (item->data(0) == Rtti_NoCollision || item->data(0) == Rtti_Putter)
{
if (item->data(0) == Rtti_NoCollision)
game->playSound(Sound::Wall);
continue;
}
if (!isVisible() || state == Holed)
return;
CanvasItem *citem = dynamic_cast<CanvasItem *>(item);
if (citem)
{
if (!citem->terrainCollisions())
{
//do collision
const bool allowTerrainCollisions = citem->collision(this);
doTerrainCollisions = doTerrainCollisions && allowTerrainCollisions;
}
break;
}
}
if (doTerrainCollisions)
{
foreach (QGraphicsItem* item, items)
{
CanvasItem *citem = dynamic_cast<CanvasItem *>(item);
if (citem && citem->terrainCollisions())
{
// slopes return false
// as only one should be processed
// however that might not always be true
if (!citem->collision(this))
{
break;
}
}
}
}
const double currentVelocity = Vector(velocity()).magnitude();
const double velocityChange = qAbs(initialVelocity - currentVelocity);
if(currentVelocity < minSpeed && velocityChange < minSpeed && currentVelocity)
{
//cutoff low velocities
setVelocity(Vector());
setState(Stopped);
}
}
BallState Ball::currentState()
{
return state;
}
QList<QGraphicsItem*> Ball::infoItems() const
{
return QList<QGraphicsItem*>() << label;
}
void Ball::setName(const QString &name)
{
label->setText(name);
}
void Ball::setVisible(bool yes)
{
EllipticalCanvasItem::setVisible(yes);
setState(state);
}
Kolf::Overlay* Ball::createOverlay()
{
return new Kolf::Overlay(this, this);
}
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