62d4840011
The scale(), rotate() and translate() functions are replaced with QGraphicsItem::setTransform. Change-Id: Icb81c71b1513c049e2fd607995ca3a868108ee30 Reviewed-by: Lars Knoll <lars.knoll@nokia.com> Reviewed-by: Andreas Aardal Hanssen <andrhans@cisco.com>
138 lines
4.3 KiB
C++
138 lines
4.3 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
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** the names of its contributors may be used to endorse or promote
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** products derived from this software without specific prior written
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** permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "car.h"
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#include <QtWidgets/QtWidgets>
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#include <math.h>
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static const double Pi = 3.14159265358979323846264338327950288419717;
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QRectF Car::boundingRect() const
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{
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return QRectF(-35, -81, 70, 115);
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}
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Car::Car() : color(Qt::green), wheelsAngle(0), speed(0)
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{
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startTimer(1000 / 33);
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setFlag(QGraphicsItem::ItemIsMovable, true);
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setFlag(QGraphicsItem::ItemIsFocusable, true);
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}
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void Car::accelerate()
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{
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if (speed < 10)
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++speed;
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}
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void Car::decelerate()
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{
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if (speed > -10)
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--speed;
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}
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void Car::turnLeft()
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{
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if (wheelsAngle > -30)
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wheelsAngle -= 5;
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}
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void Car::turnRight()
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{
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if (wheelsAngle < 30)
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wheelsAngle += 5;
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}
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void Car::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
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{
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Q_UNUSED(option);
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Q_UNUSED(widget);
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painter->setBrush(Qt::gray);
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painter->drawRect(-20, -58, 40, 2); // front axel
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painter->drawRect(-20, 7, 40, 2); // rear axel
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painter->setBrush(color);
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painter->drawRect(-25, -79, 50, 10); // front wing
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painter->drawEllipse(-25, -48, 50, 20); // side pods
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painter->drawRect(-25, -38, 50, 35); // side pods
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painter->drawRect(-5, 9, 10, 10); // back pod
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painter->drawEllipse(-10, -81, 20, 100); // main body
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painter->drawRect(-17, 19, 34, 15); // rear wing
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painter->setBrush(Qt::black);
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painter->drawPie(-5, -51, 10, 15, 0, 180 * 16);
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painter->drawRect(-5, -44, 10, 10); // cocpit
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painter->save();
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painter->translate(-20, -58);
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painter->rotate(wheelsAngle);
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painter->drawRect(-10, -7, 10, 15); // front left
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painter->restore();
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painter->save();
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painter->translate(20, -58);
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painter->rotate(wheelsAngle);
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painter->drawRect(0, -7, 10, 15); // front left
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painter->restore();
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painter->drawRect(-30, 0, 12, 17); // rear left
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painter->drawRect(19, 0, 12, 17); // rear right
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}
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void Car::timerEvent(QTimerEvent *event)
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{
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Q_UNUSED(event);
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const qreal axelDistance = 54;
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qreal wheelsAngleRads = (wheelsAngle * Pi) / 180;
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qreal turnDistance = ::cos(wheelsAngleRads) * axelDistance * 2;
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qreal turnRateRads = wheelsAngleRads / turnDistance; // rough estimate
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qreal turnRate = (turnRateRads * 180) / Pi;
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qreal rotation = speed * turnRate;
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setTransform(QTransform().rotate(rotation), true);
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setTransform(QTransform::fromTranslate(0, -speed), true);
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update();
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}
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