51 lines
1.3 KiB
C++
51 lines
1.3 KiB
C++
#include "cars.h"
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#include <QPainter>
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Cars::Cars(QWidget *parent, int dir, Cars::Color color) : QWidget(parent)
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{
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if(color==RANDOM)
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color = Cars::Color(rand()%3); //车身颜色一定是确定的
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m_color = color;
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m_dir = dir;
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m_pos = this->pos();
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resize(M_WID, M_LEN);
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switch (m_color) {
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case Pink:
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m_pixmap = QPixmap(":/cars/pink");
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break;
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case Red:
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m_pixmap = QPixmap(":/cars/red");
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break;
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case Yellow:
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m_pixmap = QPixmap(":/cars/yellow");
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break;
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default:
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m_pixmap = QPixmap(":/cars/red");
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break;
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}
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}
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void Cars::paintEvent(QPaintEvent *event) {
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QPainter painter(this);
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m_pos = this->pos();
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painter.translate(M_WID/2, M_LEN/2); //转移远点，设置旋转中心
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painter.rotate(m_dir); //旋转
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painter.translate(-M_WID/2, -M_LEN/2); //移回远点
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painter.drawPixmap(0, 0, M_WID, M_LEN, m_pixmap); //绘制小车
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painter.setPen(QPen(Qt::red, 5));
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painter.drawRect(0, 0, M_WID, M_LEN);
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event->ignore();
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}
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void Cars::Forward(int vel)
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{
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float ang = m_dir*PI/180;
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this->move(m_pos.x()+vel*sin(ang), m_pos.y()-vel*cos(ang));
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}
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void Cars::Backward(int vel)
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{
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float ang = m_dir*PI/180;
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this->move(m_pos.x()-vel*sin(ang), m_pos.y()+vel*cos(ang));
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}
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