Qt_update

src/估算距离.cpp

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+#include <QCoreApplication>
+#include <QDebug>
+#include <cmath>
+
+double calculateRegionSize(int pixel_size, int top_left_pixel_x, int top_left_pixel_y, int bottom_right_pixel_x, int bottom_right_pixel_y, int h, int size)
+{
+    // 计算选择区域内像素数
+    int pixels_in_region = (bottom_right_pixel_x - top_left_pixel_x) * (bottom_right_pixel_y - top_left_pixel_y);
+
+    // 计算像素对应实际大小
+    double real_size = (h * 1000.0) * pixel_size / size; // 单位：mm/像素
+
+    // 计算选定区域的实际大小（单位：米）
+    double region_size = std::sqrt(pixels_in_region * real_size * real_size) / 1000.0; // 单位：m
+
+    return region_size;
+}
+
+int main(int argc, char *argv[])
+{
+    QCoreApplication a(argc, argv);
+
+    // 相机像素大小 像素与像素距离
+    int pixel_size = 5;
+
+    // 指定区域范围，左上角和右下角像素坐标
+    int top_left_pixel_x = 100;
+    int top_left_pixel_y = 150;
+    int bottom_right_pixel_x = 200;
+    int bottom_right_pixel_y = 250;
+
+    // 估计参数
+    int h = 10;
+    int size = 100;
+
+    // 计算选定区域的实际大小（单位：米）
+    double region_size = calculateRegionSize(pixel_size, top_left_pixel_x, top_left_pixel_y, bottom_right_pixel_x, bottom_right_pixel_y, h, size);
+
+    qDebug() << "The selected region size is:" << region_size << "m.";
+
+    return a.exec();
+}

src/标记火源.cpp

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+#include <QApplication>
+#include <QWidget>
+#include <QLabel>
+#include <QPixmap>
+#include <QPainter>
+
+// 将矩形范围内绘制为指定颜色的矩形，并添加透明度
+void drawRectWithTransparency(QPixmap& pixmap, const QRect& rect, const QColor& color, int transparency)
+{
+    QPainter painter(&pixmap);
+    painter.setCompositionMode(QPainter::CompositionMode_Clear);
+    painter.fillRect(rect, QColor(0, 0, 0, 0));
+    painter.setCompositionMode(QPainter::CompositionMode_SourceOver);
+    painter.fillRect(rect, QColor(color.red(), color.green(), color.blue(), transparency));
+}
+
+int main(int argc, char *argv[])
+{
+    QApplication app(argc, argv);
+
+    // 创建窗口和标签
+    QWidget window;
+    QLabel label(&window);
+
+    // 加载图片
+    QPixmap pixmap(":1.png");
+    QRect rect(360, 360, 300, 250);
+    drawRectWithTransparency(pixmap, rect, QColor(255, 0, 0), 100);
+    label.setPixmap(pixmap);
+
+    // 显示窗口和标签
+    window.show();
+    label.show();
+
+    return app.exec();
+}

src/火势预测.cpp

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+#include <QApplication>
+#include <QWidget>
+#include <QLabel>
+#include <QPixmap>
+#include <QPainter>
+#include <QVBoxLayout>
+
+void drawRectOnImage(QString imagePath, QRect rect1, QRect rect2, QColor color1, QColor color2)
+{
+    // 加载图片
+    QPixmap pixmap(imagePath);
+
+    // 指定范围并绘制透明红色和黑色矩形
+    QPainter painter(&pixmap);
+    painter.setCompositionMode(QPainter::CompositionMode_Clear);
+    painter.fillRect(rect1, QColor(0, 0, 0, 0));
+    painter.fillRect(rect2, color2); // 黑色矩形
+    painter.setCompositionMode(QPainter::CompositionMode_SourceOver);
+    painter.fillRect(rect1, color1);
+
+    // 显示图片
+    QWidget *mainWindow = new QWidget();
+    QVBoxLayout *layout = new QVBoxLayout(mainWindow);
+    QLabel *label = new QLabel(mainWindow);
+    layout->addWidget(label);
+    label->setFixedSize(pixmap.size());
+    label->setPixmap(pixmap);
+    mainWindow->show();
+
+    // 进入主事件循环
+    QApplication::exec();
+    delete mainWindow;
+}
+
+int main(int argc, char *argv[])
+{
+    QApplication app(argc, argv);
+
+    // 绘制矩形到图片中，并在标签上显示图片
+    QRect rect1(360, 360, 300, 250);
+    QRect rect2(400, 400, 300, 250);
+    QColor color1(255, 0, 0, 100);
+    QColor color2(0, 0, 255, 100);
+    drawRectOnImage(":1.png", rect1, rect2, color1, color2);
+
+    return 0;
+}