Qt 实现家居状态温度湿度图表

#include 'information.h' #include 'ui_information.h' #include 'sqlite.h' #include <QtCharts/QChartView> #include <QtCharts/QLineSeries> #include <QtCharts/QValueAxis> #include #include #include

Information::Information(QWidget *parent) : QWidget(parent), ui(new Ui::Information) { ui->setupUi(this); setWindowTitle('家居状态'); setFixedSize(600,400);

QVBoxLayout *layout = new QVBoxLayout(this); // 创建一个垂直布局对象

// 创建温度折线图
QtCharts::QChartView *temperatureChartView = new QtCharts::QChartView(this);
QtCharts::QLineSeries *temperatureSeries = new QtCharts::QLineSeries();

Sqlite::sqlite_init();
QSqlQuery temperatureQuery;
temperatureQuery.exec("SELECT value FROM Status WHERE device_name = '空调' AND device_state = '开启'");
while (temperatureQuery.next())
{
    double temperature = temperatureQuery.value(0).toDouble();
    temperatureSeries->append(temperatureSeries->count(), temperature);
}

QtCharts::QChart *temperatureChart = new QtCharts::QChart();
temperatureChart->addSeries(temperatureSeries);

QtCharts::QValueAxis *temperatureAxisY = new QtCharts::QValueAxis();
temperatureAxisY->setRange(-5, 42); // 设置纵坐标范围为-5~42
temperatureChart->addAxis(temperatureAxisY, Qt::AlignLeft);
temperatureSeries->attachAxis(temperatureAxisY);

temperatureChart->setTitle("空调温度变化表"); // 设置折线图名

temperatureChartView->setChart(temperatureChart);
temperatureChartView->setRenderHint(QPainter::Antialiasing);
temperatureChartView->setMinimumSize(600, 200);



temperatureChartView->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);

// 创建湿度折线图
QtCharts::QChartView *humidityChartView = new QtCharts::QChartView(this);
QtCharts::QLineSeries *humiditySeries = new QtCharts::QLineSeries();

QSqlQuery humidityQuery;
humidityQuery.exec("SELECT value FROM Status WHERE device_name = '加湿器' AND device_state = '开启'");
while (humidityQuery.next())
{
    double humidity = humidityQuery.value(0).toDouble();
    humiditySeries->append(humiditySeries->count(), humidity);
}

QtCharts::QChart *humidityChart = new QtCharts::QChart();
humidityChart->addSeries(humiditySeries);

QtCharts::QValueAxis *humidityAxisY = new QtCharts::QValueAxis();
humidityAxisY->setRange(0, 100); // 设置纵坐标范围为0~100
humidityChart->addAxis(humidityAxisY, Qt::AlignLeft);
humiditySeries->attachAxis(humidityAxisY);

humidityChart->setTitle("加湿器湿度变化表"); // 设置折线图名

humidityChartView->setChart(humidityChart);
humidityChartView->setRenderHint(QPainter::Antialiasing);
humidityChartView->setMinimumSize(600, 200);



humidityChartView->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);

layout->addWidget(temperatureChartView); // 将温度折线图添加到布局中
layout->addWidget(humidityChartView); // 将湿度折线图添加到布局中


setLayout(layout); // 将布局对象设置为窗口的布局

}

Information::~Information() { delete ui; } 温度表和湿度表加入垂直布局后变形如何解决

如果温度表和湿度表加入垂直布局后变形，可以尝试以下方法来解决：

设置温度表和湿度表的大小策略为Expanding，这样它们会尽可能地填充布局空间，避免变形。例如：temperatureChartView->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
调整温度表和湿度表的最小大小，使其适应布局。例如：temperatureChartView->setMinimumSize(600, 200);
调整布局的大小策略，以适应温度表和湿度表的大小。例如：layout->setSizeConstraint(QLayout::SetMinimumSize);
调整温度表和湿度表的布局属性，例如设置水平和垂直的拉伸因子，以控制它们在布局中的大小和位置。例如：layout->addWidget(temperatureChartView, 0, Qt::AlignTop); // 将温度表添加到布局的顶部位置

如果以上方法无效，可能需要进一步检查温度表和湿度表的布局属性、布局容器的大小和其他相关因素，以确定问题的具体原因并解决之。