添加Path类

car.cpp

@@ -0,0 +1,82 @@
+#include "car.h"
+
+
+Car::Car(QGraphicsItem *parent, int dir, Car::Color color) : QGraphicsPixmapItem(parent)
+{
+    m_pos = this->pos();
+    this->setRotation(dir);
+    if(color==RANDOM)
+        color = Car::Color(rand()%3);  //车身颜色一定是确定的
+    m_color = color;
+    switch (m_color) {
+    case Pink:
+        m_pic = QPixmap(":/cars/pink");
+        break;
+    case Red:
+        m_pic = QPixmap(":/cars/red");
+        break;
+    case Yellow:
+        m_pic = QPixmap(":/cars/yellow");
+        break;
+    default:
+        m_pic = QPixmap(":/cars/red");
+        break;
+    }
+    m_pic = m_pic.scaled(M_WID, M_LEN);
+    this->setPixmap(m_pic);
+    setTransformOriginPoint(M_WID/2, M_LEN/2);  //设置旋转中心
+}
+
+void Car::Forward(qreal vel)
+{
+    qreal ang = qDegreesToRadians(rotation());
+    this->moveBy(+vel*qSin(ang), -vel*qCos(ang));
+}
+
+void Car::Backward(qreal vel)
+{
+    qreal ang = qDegreesToRadians(rotation());
+    this->moveBy(-vel*qSin(ang), +vel*qCos(ang));
+}
+
+void Car::moveLeft(qreal vel)
+{
+    qreal ang = qDegreesToRadians(rotation());
+    moveBy(-vel*qCos(ang), -vel*qSin(ang));
+}
+
+void Car::moveRight(qreal vel)
+{
+    qreal ang = qDegreesToRadians(rotation());
+    moveBy(vel*qCos(ang), vel*qSin(ang));
+}
+
+//ang为旋转角度（弧度），正数为顺时针，负数逆时针
+void Car::Rotate(qreal ang)
+{
+    setRotation(rotation() + ang);
+}
+
+void Car::turnLeft(int r, int ang)
+{
+    Forward(r*qSin(ang));
+    Rotate(-ang);
+    moveLeft(r*(1-qCos(ang)));
+}
+
+void Car::turnRight(int r, int ang)
+{
+    Forward(r*qSin(ang));
+    Rotate(ang);
+    moveRight(r*(1-qCos(ang)));
+}
+
+Car::Color Car::getColor()
+{
+    return this->m_color;
+}
+
+qreal Car::getDir()
+{
+    return this->rotation();
+}