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https://github.com/crystalidea/qt6windows7.git
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98 lines
2.3 KiB
C++
98 lines
2.3 KiB
C++
// Copyright (C) 2016 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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#include "car.h"
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#include <QtWidgets/QtWidgets>
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#include <cmath>
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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()
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{
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startTimer(1000 / 33);
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setFlags(ItemIsMovable | ItemIsFocusable);
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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 = qDegreesToRadians(wheelsAngle);
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qreal turnDistance = std::cos(wheelsAngleRads) * axelDistance * 2;
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qreal turnRateRads = wheelsAngleRads / turnDistance; // rough estimate
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qreal turnRate = qRadiansToDegrees(turnRateRads);
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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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