目录
- 参考图
- 说明
- 1. 项目结构
- 2. TempChartView.pro
- 3. main.cpp
- 4. TemperatureSeries.qml
- 5. main.qml
- 详细说明
参考图
说明
-
Qt Charts 提供了一系列使用图表功能的简单方法。它使用Qt Graphics View Framework 图形视图框架，因此可以很容易集成到用户界面。可以使用Qt Charts作为QWidgets, QGraphicsWidget, 或者 QML类型。
-
使用Qt Charts时：需要在.pro文件中添加 QT += charts
-
Qt Charts提供了如下图表类型：
折线图和曲线图
面积图和散点图
柱状图
饼状图
箱形图
蜡烛图
极坐标图
1. 项目结构
TempChartView/
├── main.cpp
├── main.qml
├── qml.qrc
├── TemperatureSeries.qml
├── TempChartView.pro
2. TempChartView.pro
QT += charts qml quick# You can make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0SOURCES += \main.cppRESOURCES += qml.qrc# Additional import path used to resolve QML modules in Qt Creator's code model
QML_IMPORT_PATH =# Additional import path used to resolve QML modules just for Qt Quick Designer
QML_DESIGNER_IMPORT_PATH =# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target3. main.cpp
#include <QtWidgets/QApplication>
#include <QQmlApplicationEngine>
#include <QQmlContext>
#include <QtQuick/QQuickView>
#include <QtCore/QDir>
#include <QtQml/QQmlEngine>int main(int argc, char *argv[])
{QApplication app(argc, argv);QQmlApplicationEngine engine;engine.load(QUrl(QStringLiteral("qrc:/main.qml")));if (engine.rootObjects().isEmpty())return -1;return app.exec();}4. TemperatureSeries.qml
实现样式和多条曲线：
import QtQuick 2.15
import QtCharts 2.15
import QtQuick.Controls 2.15ChartView {id: chartViewwidth: 800height: 600antialiasing: truetitle: "温度变化图"legend.visible: falseValueAxis {id: axisXmin: 0max: 100titleText: "时间/hh:mm:ss"}ValueAxis {id: axisYmin: 0max: 110titleText: "温度/℃"}LineSeries {id: tempSeries1name: "Temperature 1"useOpenGL: trueaxisX: axisXaxisY: axisYcolor: "red"}LineSeries {id: tempSeries2name: "Temperature 2"useOpenGL: trueaxisX: axisXaxisY: axisYcolor: "orange"}LineSeries {id: tempSeries3name: "Temperature 3"useOpenGL: trueaxisX: axisXaxisY: axisYcolor: "blue"}Timer {interval: 1000running: truerepeat: trueproperty double time: 0onTriggered: {time += 1var newTemp1 = 85 + (Math.sin(time / 10) * 5)var newTemp2 = 60 + (Math.sin(time / 10) * 5)var newTemp3 = 35 + (Math.sin(time / 10) * 5)tempSeries1.append(time, newTemp1)tempSeries2.append(time, newTemp2)tempSeries3.append(time, newTemp3)if (tempSeries1.count > 100) {tempSeries1.remove(0)tempSeries2.remove(0)tempSeries3.remove(0)axisX.min += 1axisX.max += 1}}}
}
5. main.qml
修改以适应新组件：
import QtQuick 2.15
import QtQuick.Controls 2.15
import QtCharts 2.15ApplicationWindow {visible: truewidth: 800height: 600title: "Temperature Chart Example"TemperatureSeries {anchors.fill: parent}
}详细说明
- main.cpp: 初始化QML应用程序并加载主QML文件
main.qml。 - TemperatureSeries.qml:
ChartView: 用于显示图表。ValueAxis: 定义X轴和Y轴的范围和标签。LineSeries: 用于显示多条温度数据线，每条线代表不同的温度曲线，并指定颜色。Timer: 每秒生成三个随机温度值并添加到LineSeries中。如果数据点超过100个，则移除最早的数据点，并调整X轴范围，以实现实时更新效果。
- main.qml: 定义应用程序窗口，并包含
TemperatureSeries组件。
