C＃是否具有Pascal画布之类的东西？

Question

In Pascal it is pretty easy to draw lines and realise something like turtle graphics because you can draw right on the form. After trying to find something related in C# fon r quite a while now I did not come across anything useful. My questions are:

• Is there any way in C# to manage this task as it is in Pascal?
• If not what "standard" other solutions can I use to implement such a turtle?

Answer 1

Override the OnPaint on your form and then you can use the graphics object off of the PaintEventArgs to draw on the form:

protected override void OnPaint(PaintEventArgs e)
{
    base.OnPaint(e);
    e.Graphics.DrawRectangle(Pens.Red, new Rectangle(0,0,20,20));
    e.Graphics.DrawLine(Pens.Blue, 20,20,30,30);
    e.Graphics.DrawIcon(this.Icon, new Rectangle(30,30,30,30));
}

Which yields a form that looks like this:

Answer 2

If you are using WinForms, take a look at this example on MSDN which shows how to draw straight on to a form using System.Drawing.Graphics

How to: Draw a Filled Rectangle on a Windows Form

This code sample is straight from that link:

System.Drawing.SolidBrush myBrush = new System.Drawing.SolidBrush(System.Drawing.Color.Red);
System.Drawing.Graphics formGraphics;
formGraphics = this.CreateGraphics();
formGraphics.FillRectangle(myBrush, new Rectangle(0, 0, 200, 300));
myBrush.Dispose();
formGraphics.Dispose();