显示了站点的图片

include/mainScene.h

@@ -7,28 +7,58 @@
 
 #include "QGraphicsScene"
 #include "QGraphicsPixmapItem"
-#include "railsModel.h"
+
+class PosPair{
+
+public:
+    int pos_x;
+    int pos_y;
+
+    PosPair();
+    /**
+     * 获取两个站点之间的距离
+     * @param stop_number 站点的数量
+     * @return 站点之间的距离
+     */
+    int GetStopSpaceLength(int stop_number) const;
+    /**
+     * 加上一定的距离
+     * @param length 需要加上的距离
+     */
+    void AddLength(int length);
+
+private:
+    const int stop_begin_x = 100;
+    const int stop_begin_y = 80;
+    const int stop_rail_width = 300;
+    const int stop_rail_height = 200;
+
+    int distance = 0;
+};
 
 class SceneManager
 {
 public:
     QGraphicsScene *scene;
 
+    /**
+     * 构造函数，同时生成站点
+     * @param stop_node_number 站点的数量
+     */
+    explicit SceneManager(int stop_node_number);
     ~SceneManager();
 
-    /**
-     * 初始化绘制场景
-     */
-    void init();
-
-    /**
-     * 初始化场景中的站点
-     * @param rail_head 轨道的头节点
-     */
-    void initBusStop(rail_node_t *rail_head);
-
 private:
+    /**
+     * 显示站点的像素图对象
+     */
     QGraphicsPixmapItem *pixmap_items;
+    /**
+     * 每个站点的所在位置
+     */
+    PosPair *stop_pos_pairs;
+
+    QGraphicsRectItem *rect_item;
 };
 
 #endif //AUTO_BUS_GUI_MAIN_SCENE_H

src/centralwidget.cpp

@@ -12,16 +12,13 @@
 CentralWidget::CentralWidget(QWidget *parent) : QWidget(parent), ui(new Ui::CentralWidget)
 {
     ui->setupUi(this);
-
-    scene_manager = new SceneManager;
-    scene_manager->init();
-    scene_manager->initBusStop(nullptr);
+    scene_manager = new SceneManager(20);
 
     ui->main_canva->setScene(scene_manager->scene);
 }
 
 CentralWidget::~CentralWidget()
 {
-    delete ui;
     delete scene_manager;
+    delete ui;
 }

src/mainScene.cpp

@@ -4,23 +4,95 @@
 
 #include "mainScene.h"
 
-void SceneManager::init()
+SceneManager::SceneManager(int stop_node_number)
 {
     scene = new QGraphicsScene;
+    pixmap_items = new QGraphicsPixmapItem[stop_node_number];
+    stop_pos_pairs = new PosPair[stop_node_number];
+    rect_item = new QGraphicsRectItem;
+
+    int stop_space_length = stop_pos_pairs->GetStopSpaceLength(stop_node_number);
+    double stop_scale = 0.15;
+    QTransform stop_transform;
+
+    stop_transform.scale(stop_scale, stop_scale);
+
+    // 为站点对象设置
+    // 并将其添加到画图中
+    for(size_t i = 0; i < stop_node_number; i++)
+    {
+        pixmap_items[i].setPixmap(QPixmap(":/picture/stop.png"));
+        pixmap_items[i].setTransform(stop_transform);
+        scene->addItem(&pixmap_items[i]);
     }
 
-void SceneManager::initBusStop(rail_node_t *rail_head)
+    // 初始化站点的位置
+    for(size_t i = 0; i < stop_node_number; i++)
     {
-    pixmap_items = new QGraphicsPixmapItem[1];
+        // 对于后面的节点执行累加
+        for(size_t j = i + 1; j < stop_node_number; j++)
+        {
+            stop_pos_pairs[j].AddLength(stop_space_length);
+        }
+        pixmap_items[i].setPos(stop_pos_pairs[i].pos_x, stop_pos_pairs[i].pos_y);
+        qDebug() << i << "  " << stop_pos_pairs[i].pos_x << "  " <<  stop_pos_pairs[i].pos_y;
+    }
 
-    pixmap_items->setPixmap(QPixmap(":/picture/bus.png"));
-    pixmap_items->setPos(100,100);
-
-    scene->addItem(pixmap_items);
+    // 画一个描边的矩形框
+    rect_item->setRect(0, 0, 595, 395);
+    scene->addItem(rect_item);
 }
 
 SceneManager::~SceneManager()
 {
+    delete []stop_pos_pairs;
     delete []pixmap_items;
     delete scene;
 }
+
+PosPair::PosPair()
+{
+    pos_x = stop_begin_x;
+    pos_y = stop_begin_y;
+}
+
+int PosPair::GetStopSpaceLength(int stop_number) const
+{
+    return 2 * (stop_rail_width + stop_rail_height) / stop_number;
+}
+
+void PosPair::AddLength(int length)
+{
+    distance += length;
+
+    if(distance > 2 * stop_rail_width + stop_rail_height)
+    {
+        // 站点在左轨道
+
+        pos_x = stop_begin_x;
+        pos_y = stop_begin_y + (stop_rail_width + stop_rail_height) * 2 - distance;
+    }
+    else if(distance > stop_rail_width + stop_rail_height and
+        distance <= 2 * stop_rail_width + stop_rail_height)
+    {
+        // 站点在下轨道
+
+        pos_y = stop_begin_y + stop_rail_height;
+        pos_x = stop_begin_x + 2 * stop_rail_width + stop_rail_height - distance;
+    }
+    else if(distance > stop_rail_width and
+        distance <= stop_rail_width + stop_rail_height)
+    {
+        // 站点在右轨道
+
+        pos_x = stop_begin_x + stop_rail_width;
+        pos_y = stop_begin_y + stop_rail_width + stop_rail_height - distance;
+    }
+    else
+    {
+        // 站点在上轨道
+
+        pos_y = stop_begin_y;
+        pos_x = stop_begin_x + distance;
+    }
+}