添加了公交车动画函数

include/BusWidget.h

@@ -6,23 +6,59 @@
 #define AUTO_BUS_GUI_BUS_WIDGET_H
 #include "QGraphicsPixmapItem"
 #include "QTransform"
+#include "QPropertyAnimation"
 
 #include "PosPair.h"
+#include "define.h"
+
+/**
+ * 显示公交车的对象
+ * 继承了QObject QGraphicsPixmapItem
+ * 用以使用qt的动画框架
+ */
+class BusItem: public QObject, public QGraphicsPixmapItem
+{
+    // 调用这个宏使其qt对象化
+    Q_OBJECT
+    // 注册了一个QPointF类型的变量pos
+    // 读取这个变量通过 pos()函数
+    // 写入这个变量通过 setPos()函数
+    Q_PROPERTY(QPointF pos READ pos WRITE setPos)
+public:
+    explicit BusItem(const QPixmap& pixmap);
+};
+
 
 class BusWidget
 {
 public:
-    QGraphicsPixmapItem *item;
+    BusItem *item;
 
 
     explicit BusWidget();
 
     ~BusWidget();
 
-    void ResetBusPos(PosPair *s);
+    /**
+     * 重置公交车
+     * @param s 位置对数组的头指针
+     * @param num 站点数目
+     */
+    void ResetBusPos(PosPair *s, int num);
+
+    /**
+     * 开始公交车动画
+     * @param direction 动画的方向
+     * @param duration 动画持续的时间 ms
+     */
+    void StartAnimation(int direction, int duration);
 
 private:
     PosPair *pos_pairs = nullptr;
+    QPropertyAnimation *animation;
+
+    int pos = 0;
+    int node_num = 0;
 };
 
 

src/BusWidget.cpp

@@ -2,11 +2,17 @@
 // Created by ricardo on 2022/6/28.
 //
 
-#include "BusWidget.h"
+#include "moc_BusWidget.cpp"
+
+BusItem::BusItem(const QPixmap &pixmap) : QGraphicsPixmapItem(pixmap)
+{
+
+}
 
 BusWidget::BusWidget()
 {
-    item = new QGraphicsPixmapItem(QPixmap(":/picture/bus.png"));
+    item = new BusItem(QPixmap(":/picture/bus.png"));
+    animation = new QPropertyAnimation(item, "pos");
 
     // 设置缩放
     double bus_scale = 0.1;
@@ -20,9 +26,48 @@ BusWidget::~BusWidget()
     delete item;
 }
 
-void BusWidget::ResetBusPos(PosPair *s)
+void BusWidget::ResetBusPos(PosPair *s, int num)
 {
     pos_pairs = s;
+    pos = 0;
+    node_num = num;
 
-    item->setPos(s[0].GetBusPosX(), s[0].GetBusPosY());
+    item->setPos(pos_pairs[0].GetBusPosX(), pos_pairs[0].GetBusPosY());
+}
+
+void BusWidget::StartAnimation(int direction, int duration)
+{
+    bool is_animate = false;
+
+    animation->setDuration(duration);
+    animation->setStartValue(QPointF(pos_pairs[pos].GetBusPosX(), pos_pairs[pos].GetBusPosY()));
+
+    switch (direction)
+    {
+        case BUS_CLOCK_WISE:
+            pos++;
+            is_animate = true;
+            // 处理环绕一圈的情况
+            if(pos == node_num)
+            {
+                pos = pos - node_num;
+            }
+            break;
+        case BUS_COUNTER_CLOCK_WISE:
+            pos--;
+            is_animate = true;
+            // 处理环绕一圈的情况
+            if(pos == -1)
+            {
+                pos = pos + node_num;
+            }
+        default:
+            break;
+    }
+
+    if(is_animate)
+    {
+        animation->setEndValue(QPointF(pos_pairs[pos].GetBusPosX(), pos_pairs[pos].GetBusPosY()));
+        animation->start();
+    }
 }

src/mainScene.cpp

@@ -66,7 +66,7 @@ void SceneManager::SetStopScene(int node_number)
     }
 
     // 设置公交车图像
-    bus->ResetBusPos(stop_pos_pairs);
+    bus->ResetBusPos(stop_pos_pairs, node_number);
     scene->addItem(bus->item);
 }