Qt QChart之曲线图,饼状图,条形图使用

Posted 2020-12-14 ybqjymy

 1.使用准备

在pro中, 添加QT+= charts

然后在界面头文件中添加头文件并声明命名空间,添加:

1 #include <QtCharts>
2 QT_CHARTS_USE_NAMESPACE

---

2.QChart之曲线图

绘制曲线图需要用到3个类

• QSplineSeries:  用于创建有由一系列数据组成的曲线.类似的还有QPieSeries(饼图数据). QLineSeries(折线数据)
• QChart:    图表界面,用来管理图表内容,颜色,大小等
• QChartView:  负责显示QChart

效果如下:

代码如下所示:

 1     m_chart = new QChart();
 2 
 3     QPieSeries *series = new QPieSeries();
 4     series->append("水果:30%",3);     //添加标签"水果:30%" 和 百分值30%
 5     series->append("零食:20%",2);
 6     series->append("主食:50%",5);
 7 
 8     series->setLabelsVisible(true);
 9     series->setUseOpenGL(true);
10     series->slices().at(0)->setColor(QColor(13,128,217));   //设置颜色
11     series->slices().at(0)->setLabelColor(QColor(13,128,217));
12 
13     series->slices().at(1)->setColor(QColor(69,13,217));
14     series->slices().at(1)->setLabelColor(QColor(69,13,217));
15     series->slices().at(2)->setColor(QColor(13,217,152));
16     series->slices().at(2)->setLabelColor(QColor(13,217,152));
17 
18     m_chart->setTheme(QChart::ChartThemeLight);//设置白色主题
19     m_chart->setDropShadowEnabled(true);//背景阴影
20     m_chart->addSeries(series);//添加系列到QChart上
21 
22     m_chart->setTitleBrush(QBrush(QColor(0,0,255)));//设置标题Brush
23     m_chart->setTitleFont(QFont("微软雅黑"));//设置标题字体
24     m_chart->setTitle("饼状图");
25 
26     //修改说明样式
27     m_chart->legend()->setVisible(true);
28     m_chart->legend()->setAlignment(Qt::AlignBottom);//底部对齐
29     m_chart->legend()->setBackgroundVisible(true);//设置背景是否可视
30     m_chart->legend()->setAutoFillBackground(true);//设置背景自动填充
31     m_chart->legend()->setColor(QColor(222,233,251));//设置颜色
32     m_chart->legend()->setLabelColor(QColor(0,100,255));//设置标签颜色
33     m_chart->legend()->setMaximumHeight(50);
34 
35     QChartView *chartView = new QChartView(m_chart);
36     chartView->setRenderHint(QPainter::Antialiasing);
37 
38     QVBoxLayout *pVLayout = new QVBoxLayout(this);
39     pVLayout->addWidget(chartView);
40 
41     resize(960, 720);

 

---

3.QChart之饼图

绘制饼图需要用到3个类

• QSplineSeries:   用于创建有由一系列数据组成的饼图数据
• QChart:    图表界面,用来管理图表内容,颜色,大小等
• QChartView:负责显示QChart

效果如下:

 

代码如下:

 1     m_chart = new QChart();
 2 
 3     QPieSeries *series = new QPieSeries();
 4     series->append("水果:30%",3);     //添加标签"水果:30%" 和 百分值30%
 5     series->append("零食:20%",2);
 6     series->append("主食:50%",5);
 7 
 8     series->setLabelsVisible(true);
 9     series->setUseOpenGL(true);
10     series->slices().at(0)->setColor(QColor(13,128,217));   //设置颜色
11     series->slices().at(0)->setLabelColor(QColor(13,128,217));
12 
13     series->slices().at(1)->setColor(QColor(69,13,217));
14     series->slices().at(1)->setLabelColor(QColor(69,13,217));
15     series->slices().at(2)->setColor(QColor(13,217,152));
16     series->slices().at(2)->setLabelColor(QColor(13,217,152));
17 
18     m_chart->setTheme(QChart::ChartThemeLight);//设置白色主题
19     m_chart->setDropShadowEnabled(true);//背景阴影
20     m_chart->addSeries(series);//添加系列到QChart上
21 
22     m_chart->setTitleBrush(QBrush(QColor(0,0,255)));//设置标题Brush
23     m_chart->setTitleFont(QFont("微软雅黑"));//设置标题字体
24     m_chart->setTitle("饼状图");
25 
26     //修改说明样式
27     m_chart->legend()->setVisible(true);
28     m_chart->legend()->setAlignment(Qt::AlignBottom);//底部对齐
29     m_chart->legend()->setBackgroundVisible(true);//设置背景是否可视
30     m_chart->legend()->setAutoFillBackground(true);//设置背景自动填充
31     m_chart->legend()->setColor(QColor(222,233,251));//设置颜色
32     m_chart->legend()->setLabelColor(QColor(0,100,255));//设置标签颜色
33     m_chart->legend()->setMaximumHeight(50);
34 
35     QChartView *chartView = new QChartView(m_chart);
36     chartView->setRenderHint(QPainter::Antialiasing);
37 
38     QVBoxLayout *pVLayout = new QVBoxLayout(this);
39     pVLayout->addWidget(chartView);
40 
41     resize(960, 720);

---

 4. QChart之条形图

绘制条形图需要用到4个类

• QBarSet: 一个条形集合
• QBarSeries:  用来封装多个QBarSet的条形数据
• QChart:   图表界面,用来管理图表内容,颜色,大小等
• QChartView:  负责显示QChart

效果如下:

 

代码如下:

 1     m_chart = new QChart();
 2 
 3    
 4 
 5     //创建3个条线数据
 6     QBarSet *set0 = new QBarSet("零食");
 7     QBarSet *set1 = new QBarSet("水果");
 8     QBarSet *set2 = new QBarSet("主食");
 9 
10     *set0 << 158 << 685 << 458 << 260 << 354;    //向零食数据添加这4个月的销售数据
11     *set1 << 350 << 725 << 602 << 523 << 458;
12     *set2 << 222 << 350 << 598 << 480 << 687;
13 
14     set0->setLabelColor(QColor(0,0,255));       //设置条形数据颜色
15     set1->setLabelColor(QColor(0,0,255));
16     set2->setLabelColor(QColor(0,0,255));
17 
18     QBarSeries *series = new QBarSeries();
19     series->append(set0);
20     series->append(set1);
21     series->append(set2);
22     series->setVisible(true);
23     series->setLabelsVisible(true);
24 
25     m_chart->setTheme(QChart::ChartThemeLight);//设置白色主题
26     m_chart->setDropShadowEnabled(true);//背景阴影
27     m_chart->addSeries(series);//添加系列到QChart上
28 
29     m_chart->setTitleBrush(QBrush(QColor(0,0,255)));//设置标题Brush
30     m_chart->setTitleFont(QFont("微软雅黑"));//设置标题字体
31     m_chart->setTitle("超市销售条形图");
32 
33     //创建X轴和Y轴
34     QBarCategoryAxis *axisX = new QBarCategoryAxis;
35     axisX->append("一月");
36     axisX->append("二月");
37     axisX->append("三月");
38     axisX->append("四月");
39     axisX->append("五月");
40     axisX->setLabelsColor(QColor(7,28,96));
41 
42     QValueAxis *axisY = new QValueAxis;
43     axisY->setRange(0,1000);   //改为setRange(0,1);则表示坐标为动态计算大小的
44     axisY->setTitleText("价格");
45     axisY->setLabelFormat("%d$");
46 
47     m_chart->setAxisX(axisX,series);
48     m_chart->setAxisY(axisY,series);
49  
50     //修改说明样式
51     m_chart->legend()->setVisible(true);
52     m_chart->legend()->setAlignment(Qt::AlignBottom);//底部对齐
53     m_chart->legend()->setBackgroundVisible(true);//设置背景是否可视
54     m_chart->legend()->setAutoFillBackground(true);//设置背景自动填充
55     m_chart->legend()->setColor(QColor(222,233,251));//设置颜色
56     m_chart->legend()->setLabelColor(QColor(0,100,255));//设置标签颜色
57     m_chart->legend()->setMaximumHeight(50);
58 
59     QChartView *chartView = new QChartView(m_chart);
60     chartView->setRenderHint(QPainter::Antialiasing);
61 
62     QVBoxLayout *pVLayout = new QVBoxLayout(this);
63     pVLayout->addWidget(chartView);
64 
65     resize(960, 720);