动态创建图表 [英] Dynamically creating charts

问题描述

我正在尝试在表单内为计算机中的每个驱动器动态创建图表。

I am trying to dynamically create a chart for each drive in the computer, inside a form.

每个图表应为饼图，其中包含以GB为单位的可用空间（绿色）和已用空间（红色）的数量。

Each chart should be a pie chart that contains the amount of free space (colored green) and used space(colored red) in GBs.

但是当我运行以下代码时，我唯一看到的是标题为 C：\， D：\等的空白矩形。

But when I run the following code the only thing I see is blank rectangles with the titles of "C:\", "D:\" and so on.

这是代码：

    public static void DrawCharts()
    {
        Chart[] charts = new Chart[DriveInfo.GetDrives().Length];
        DriveInfo[] drives = DriveInfo.GetDrives();
        for (int i = 0; i < drives.Length; i++)
        {
            charts[i] = new Chart();
            charts[i].Palette = ChartColorPalette.BrightPastel;
            charts[i].Titles.Add(drives[i].Name);
            charts[i].Series.Add("Storage");
            charts[i].Series[0].ChartType = SeriesChartType.Pie;
            charts[i].Location = new System.Drawing.Point(20 + i * 231, 30);
            charts[i].Size = new System.Drawing.Size(230, 300);
            DataPoint d = new DataPoint();
            d.XValue = 1;
            double[] p = { (double)drives[i].TotalFreeSpace / 1000000000 };
            d.YValues = p;
            d.Color = System.Drawing.Color.YellowGreen;
            d.Label = "Free Space";
            charts[i].Series[0].Points.Add(d);
            d.Label = "Used Space";
            d.XValue = 2;
            double[] a = { (double)((drives[i].TotalSize - drives[i].TotalFreeSpace) / 1000000000) };
            d.YValues = a;
            d.Color = System.Drawing.Color.Red;
            charts[i].Series[0].Points.Add(d);
            Form1.tabs.TabPages[1].Controls.Add(charts[i]);
            charts[i].Invalidate();
        }
    }

谢谢。

推荐答案

您快到了。

但是您需要添加到动态创建的图表中的最基本的东西..：

But the most basic thing you need to add to a dynamically created chart..:

charts[i] = new Chart();

..是 ChartArea ：

charts[i].ChartAreas.Add("CA1"); // pick your name!

没有它，则无法显示 Series 。

Without it no Series can display..

使用它为 TickMarks ， GridLines 或 Label 或设置 Minima 和 Maxima 和时间间隔。好吧，至少对于大多数其他 ChartTypes 而言； Pies 完全不需要。.

Use it to style the axis with TickMarks, GridLines or Labels or to set Minima and Maxima and Intervals. Well, at least for most other ChartTypes; Pies don't need any of this anyway..

请注意，您可以拥有多个 ChartAreas 中的一个 Chart 。

Note that you can have several ChartAreas in one Chart.

还要注意，直到至少一个 Series 至少有一个 DataPoint ..

Also note that it still will display nothing until at least one Series has at least one DataPoint..

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