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| |
| #include "car.h" |
| #include <QtWidgets/QtWidgets> |
| #include <qmath.h> |
| |
| 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 = qDegreesToRadians(wheelsAngle); |
| qreal turnDistance = ::cos(wheelsAngleRads) * axelDistance * 2; |
| qreal turnRateRads = wheelsAngleRads / turnDistance; // rough estimate |
| qreal turnRate = qRadiansToDegrees(turnRateRads); |
| qreal rotation = speed * turnRate; |
| |
| setTransform(QTransform().rotate(rotation), true); |
| setTransform(QTransform::fromTranslate(0, -speed), true); |
| update(); |
| } |