void MainWindow::mousePressEvent(QMouseEvent* event)//鼠標設置障礙物起始，終點 { if(event->button()==Qt::LeftButton&&mode==0)//障礙物 { int j=(event->y()-50)/25-1,i=(event->x()-200)/25; _MAP[i][j]=!_MAP[i][j]; update(); }，將鼠標點擊變爲框選完整代碼

完整代码如下： ```cpp #include "mainwindow.h" #include "ui_mainwindow.h" #include <QMouseEvent> #include <QPainter> const int MAP_WIDTH = 20; const int MAP_HEIGHT = 20; MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) , ui(new Ui::MainWindow) { ui->setupUi(this); setFixedSize(600, 600); setWindowTitle("A* Path Finding"); mode = 0; isSelecting = false; memset(_MAP, 0, sizeof(_MAP)); } MainWindow::~MainWindow() { delete ui; } void MainWindow::mousePressEvent(QMouseEvent* event) { if (event->button() == Qt::LeftButton && mode == 0) { int j = (event->y() - 50) / 25 - 1; int i = (event->x() - 200) / 25; // 判断鼠标是否在地图区域内 if (i >= 0 && i < MAP_WIDTH && j >= 0 && j < MAP_HEIGHT) { // 记录下鼠标的起点，并将 isSelecting 标记为 true startPoint = endPoint = QPoint(i, j); isSelecting = true; update(); } } } void MainWindow::mouseMoveEvent(QMouseEvent* event) { if (isSelecting) { int j = (event->y() - 50) / 25 - 1; int i = (event->x() - 200) / 25; // 判断鼠标是否在地图区域内 if (i >= 0 && i < MAP_WIDTH && j >= 0 && j < MAP_HEIGHT) { // 记录下鼠标的终点，并调用 update 函数进行界面更新 endPoint = QPoint(i, j); update(); } } } void MainWindow::mouseReleaseEvent(QMouseEvent* event) { if (event->button() == Qt::LeftButton && mode == 0 && isSelecting) { // 标记为框选结束 isSelecting = false; // 获取框选的矩形 int left = qMin(startPoint.x(), endPoint.x()); int top = qMin(startPoint.y(), endPoint.y()); int right = qMax(startPoint.x(), endPoint.x()); int bottom = qMax(startPoint.y(), endPoint.y()); // 将框选的矩形内的格子设置为障碍物 for (int i = left; i <= right; i++) { for (int j = top; j <= bottom; j++) { if (i >= 0 && i < MAP_WIDTH && j >= 0 && j < MAP_HEIGHT) { _MAP[i][j] = true; } } } update(); } } void MainWindow::paintEvent(QPaintEvent* event) { QPainter painter(this); // 绘制地图 painter.setPen(Qt::black); painter.setBrush(Qt::white); for (int i = 0; i < MAP_WIDTH; i++) { for (int j = 0; j < MAP_HEIGHT; j++) { if (_MAP[i][j]) { painter.fillRect(QRect(i * 25 + 200, j * 25 + 50, 25, 25), Qt::black); } else { painter.drawRect(QRect(i * 25 + 200, j * 25 + 50, 25, 25)); } } } // 绘制框选的矩形 if (isSelecting) { painter.setPen(Qt::red); painter.setBrush(Qt::NoBrush); painter.drawRect(QRect(startPoint, endPoint)); } } ``` 这个代码实现了在地图上鼠标框选多个格子，并将其设置为障碍物的功能。你可以在窗口中按下鼠标左键并拖动鼠标来进行框选。