vb.net – 如何创建显示绑定到对象列表的百分比的条形图？

发布时间：2020-12-17 00:22:38 所属栏目：大数据来源：网络整理

导读：使用DataVisualization.Charting.Chart控件,我需要创建一个条形图(可能是堆积条形图),向每个人显示为该人预订的小时数以及这些小时的总小时百分比.到目前为止,我对这个野兽的集合和属性的数量有点不知所措,所以我首先得到一些帮助,然后我会自己探索更多. 我

使用DataVisualization.Charting.Chart控件,我需要创建一个条形图(可能是堆积条形图),向每个人显示为该人预订的小时数以及这些小时的总小时百分比.到目前为止,我对这个野兽的集合和属性的数量有点不知所措,所以我首先得到一些帮助,然后我会自己探索更多.

我需要将图表绑定到以下对象的列表：

Public Class DOHoursChartItem

    Public Property Name As String
    Public Property Hours As Double
    Public Property Percent As Double

End Class

我不确定我在这里需要百分比属性,有利于以某种方式让图表控件处理这个并且只给它每小时的小时值和总小时值,但这就是为什么我问：我该如何设置我上面描述的图表？

我不是很擅长VB,所以我将开始在C#中发布一个例子(如果你真的需要,我可以尝试翻译它).

以下是三个可用于将项目绑定到mschart并获取列图表的方法示例：

示例1：单个区域和并排列

private void FillChartSingleArea()
{
    // this set the datasource
    this.chart1.DataSource = GetItems();

    // clear all the (possible) existing series
    this.chart1.Series.Clear();

    // add the hours series
    var hoursSeries = this.chart1.Series.Add("Hours");
    hoursSeries.XValueMember = "Name";
    hoursSeries.YValueMembers = "Hours";
    hoursSeries.ChartType = System.Windows.Forms.DataVisualization.Charting.SeriesChartType.Column;

    // add the percentages series
    var percSeries = this.chart1.Series.Add("Percentages");
    percSeries.XValueMember = "Name";
    percSeries.YValueMembers = "Percent";
    percSeries.ChartType = System.Windows.Forms.DataVisualization.Charting.SeriesChartType.Column;
}

示例2：两个图表一个接一个

private void FillChartDoubleArea()
{
    // this set the datasource
    this.chart1.DataSource = GetItems();

    // clear all the (possible) existing series
    this.chart1.Series.Clear();

    // clear all the existing areas and add 2 new areas
    this.chart1.ChartAreas.Clear();
    this.chart1.ChartAreas.Add("Area1");
    this.chart1.ChartAreas.Add("Area2");

    // add the hours series
    var hoursSeries = this.chart1.Series.Add("Hours");
    hoursSeries.ChartArea = "Area1";
    hoursSeries.XValueMember = "Name";
    hoursSeries.YValueMembers = "Hours";
    hoursSeries.ChartType = System.Windows.Forms.DataVisualization.Charting.SeriesChartType.Column;

    // add the percentages series
    var percSeries = this.chart1.Series.Add("Percentages");
    hoursSeries.ChartArea = "Area2";
    percSeries.XValueMember = "Name";
    percSeries.YValueMembers = "Percent";
    percSeries.ChartType = System.Windows.Forms.DataVisualization.Charting.SeriesChartType.Column;
}

示例3：单个区域和堆叠列

private void FillStackedChartSingleArea()
{
    // this set the datasource
    this.chart1.DataSource = GetItems();

    // clear all the (possible) existing series
    this.chart1.Series.Clear();

    // add the hours series
    var hoursSeries = this.chart1.Series.Add("Hours");
    hoursSeries.XValueMember = "Name";
    hoursSeries.YValueMembers = "Hours";
    hoursSeries.ChartType = System.Windows.Forms.DataVisualization.Charting.SeriesChartType.StackedColumn;

    // add the percentages series
    var percSeries = this.chart1.Series.Add("Percentages");
    percSeries.XValueMember = "Name";
    percSeries.YValueMembers = "Percent";
    percSeries.ChartType = System.Windows.Forms.DataVisualization.Charting.SeriesChartType.StackedColumn;
}

其中GetItems方法定义如下(对于所有示例)：

private List<DOHoursChartItem> GetItems()
{
    var items = new List<DOHoursChartItem>()
    {
        new DOHoursChartItem("John",120),new DOHoursChartItem("Amanda",40),new DOHoursChartItem("David",70),new DOHoursChartItem("Rachel",10),};
    // compute the percentages
    var totalHours = items.Sum(x => x.Hours);
    foreach (var item in items)
        item.Percent = (item.Hours * 100.0) / totalHours;
    return items;
}

和DOHoursChartItem为：

class DOHoursChartItem
    {
        public String Name { get; set; }
        public double Hours { get; set; }
        public double Percent { get; set; }
        public DOHoursChartItem(string name,double hours)
        {
            this.Name = name;
            this.Hours = hours;
        }
    }

注：

这些实际上是柱形图;通过将ChartType设置为Bar(或StackedBar),您将获得相同的结果,但条形将具有水平方向.

（编辑：李大同）

【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容!