2b75c156b6
Change-Id: I6441ff931dbd33b698d762e6f6784898f3f60fe7 Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
138 lines
4.3 KiB
C++
138 lines
4.3 KiB
C++
/****************************************************************************
|
|
**
|
|
** Copyright (C) 2015 The Qt Company Ltd.
|
|
** Contact: http://www.qt.io/licensing/
|
|
**
|
|
** This file is part of the examples of the Qt Toolkit.
|
|
**
|
|
** $QT_BEGIN_LICENSE:BSD$
|
|
** You may use this file under the terms of the BSD license as follows:
|
|
**
|
|
** "Redistribution and use in source and binary forms, with or without
|
|
** modification, are permitted provided that the following conditions are
|
|
** met:
|
|
** * Redistributions of source code must retain the above copyright
|
|
** notice, this list of conditions and the following disclaimer.
|
|
** * Redistributions in binary form must reproduce the above copyright
|
|
** notice, this list of conditions and the following disclaimer in
|
|
** the documentation and/or other materials provided with the
|
|
** distribution.
|
|
** * Neither the name of The Qt Company Ltd nor the names of its
|
|
** contributors may be used to endorse or promote products derived
|
|
** from this software without specific prior written permission.
|
|
**
|
|
**
|
|
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
|
|
**
|
|
** $QT_END_LICENSE$
|
|
**
|
|
****************************************************************************/
|
|
|
|
#include "car.h"
|
|
#include <QtWidgets/QtWidgets>
|
|
#include <math.h>
|
|
|
|
static const double Pi = 3.14159265358979323846264338327950288419717;
|
|
|
|
QRectF Car::boundingRect() const
|
|
{
|
|
return QRectF(-35, -81, 70, 115);
|
|
}
|
|
|
|
Car::Car() : color(Qt::green), wheelsAngle(0), speed(0)
|
|
{
|
|
startTimer(1000 / 33);
|
|
setFlag(QGraphicsItem::ItemIsMovable, true);
|
|
setFlag(QGraphicsItem::ItemIsFocusable, true);
|
|
}
|
|
|
|
void Car::accelerate()
|
|
{
|
|
if (speed < 10)
|
|
++speed;
|
|
}
|
|
|
|
void Car::decelerate()
|
|
{
|
|
if (speed > -10)
|
|
--speed;
|
|
}
|
|
|
|
void Car::turnLeft()
|
|
{
|
|
if (wheelsAngle > -30)
|
|
wheelsAngle -= 5;
|
|
}
|
|
|
|
void Car::turnRight()
|
|
{
|
|
if (wheelsAngle < 30)
|
|
wheelsAngle += 5;
|
|
}
|
|
|
|
void Car::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
|
|
{
|
|
Q_UNUSED(option);
|
|
Q_UNUSED(widget);
|
|
|
|
painter->setBrush(Qt::gray);
|
|
painter->drawRect(-20, -58, 40, 2); // front axel
|
|
painter->drawRect(-20, 7, 40, 2); // rear axel
|
|
|
|
painter->setBrush(color);
|
|
painter->drawRect(-25, -79, 50, 10); // front wing
|
|
|
|
painter->drawEllipse(-25, -48, 50, 20); // side pods
|
|
painter->drawRect(-25, -38, 50, 35); // side pods
|
|
painter->drawRect(-5, 9, 10, 10); // back pod
|
|
|
|
painter->drawEllipse(-10, -81, 20, 100); // main body
|
|
|
|
painter->drawRect(-17, 19, 34, 15); // rear wing
|
|
|
|
painter->setBrush(Qt::black);
|
|
painter->drawPie(-5, -51, 10, 15, 0, 180 * 16);
|
|
painter->drawRect(-5, -44, 10, 10); // cocpit
|
|
|
|
painter->save();
|
|
painter->translate(-20, -58);
|
|
painter->rotate(wheelsAngle);
|
|
painter->drawRect(-10, -7, 10, 15); // front left
|
|
painter->restore();
|
|
|
|
painter->save();
|
|
painter->translate(20, -58);
|
|
painter->rotate(wheelsAngle);
|
|
painter->drawRect(0, -7, 10, 15); // front left
|
|
painter->restore();
|
|
|
|
painter->drawRect(-30, 0, 12, 17); // rear left
|
|
painter->drawRect(19, 0, 12, 17); // rear right
|
|
}
|
|
|
|
void Car::timerEvent(QTimerEvent *event)
|
|
{
|
|
Q_UNUSED(event);
|
|
|
|
const qreal axelDistance = 54;
|
|
qreal wheelsAngleRads = (wheelsAngle * Pi) / 180;
|
|
qreal turnDistance = ::cos(wheelsAngleRads) * axelDistance * 2;
|
|
qreal turnRateRads = wheelsAngleRads / turnDistance; // rough estimate
|
|
qreal turnRate = (turnRateRads * 180) / Pi;
|
|
qreal rotation = speed * turnRate;
|
|
|
|
setTransform(QTransform().rotate(rotation), true);
|
|
setTransform(QTransform::fromTranslate(0, -speed), true);
|
|
update();
|
|
}
|