如何在Winform的面板中显示Piechart

Question

我在winform中创建Piechart。我的图表运行正常。我唯一想添加的就是在面板中显示Piechart，但我无法做到。

这是饼图代码。

    public void DrawPieChartOnForm()
    {
        //Take Total Five Values & Draw Chart Of These Values.
        int[] myPiePercent = { 10, 20, 25, 5, 40 };

        //Take Colors To Display Pie In That Colors Of Taken Five Values.
        Color[] myPieColors = { Color.Red, Color.Black, Color.Blue, Color.Green, Color.Maroon };

        using (Graphics myPieGraphic = this.CreateGraphics())
        {
            //Give Location Which Will Display Chart At That Location.
            Point myPieLocation = new Point(10, 400);

            //Set Here Size Of The Chart…
            Size myPieSize = new Size(500, 500);

            //Call Function Which Will Draw Pie of Values.
            DrawPieChart(myPiePercent, myPieColors, myPieGraphic, myPieLocation, myPieSize);
        }
    }

请帮助我..预先感谢..

Answer 1

看看Hiren Khirsaria的这篇文章：

hirenkhirsaria.blogspot.com/2012/06/dynamically-creating-piebar-chart-in-c.html

---

我认为您需要做的是创建一个处理饼图的控件，然后将其添加到面板上。 就像是：

panel.Controls.Add(pieChart);

Answer 2

您需要了解WinForms Graphics的基础。

把你的饼到Panel ，而不是Form ，因为你现在拥有它，你只需要改变this.CreateGraphics()来panel.CreateGraphics() 但这不好！ 当您最小化窗体时，您的饼消失了，对吗？

因此， 所有绘图都必须使用其e.Graphics对象从Paint事件中发生/触发！ 只有这样，图形才能保留各种外部事件。

您可以在类级别存储数据并调用DrawPieChart在Paint中的事件Panel ，在移交e.Graphics代替myPieGraphic ..使用panel.Invalidate()来触发，只要你有改变的值漆事件..：

//Five Values at class level
int[] myPiePercent = { 10, 20, 25, 5, 40 };

//Take Colors To Display Pie In That Colors Of Taken Five Values.
Color[] myPieColors = { Color.Red, Color.Black, Color.Blue, Color.Green, Color.Maroon };


public void DrawPieChart()
{
    // maybe change the values here..
    myPiePercent = { 11, 22, 23, 15, 29 };
    // then let Paint call the draw routine:
    panel1.Invalidate();

}

private void panel1_Paint(object sender, PaintEventArgs e)
{

   //Give Location Which Will Display Chart At That Location.
   Point myPieLocation = new Point(10, 400);

   //Set Size Of The Chart
   Size myPieSize = new Size(500, 500);

   //Call Function Which Will Draw Pie of Values.
   DrawPieChart(myPiePercent, myPieColors, e.Graphics, myPieLocation, myPieSize);

}