C# 使用抽象工厂的图形编辑器

开发一个基本图形编辑器，用于使用相同形状的画笔在不同形状的画布上绘制，例如，在圆形画布上-圆形画笔（一个窗口形状可以有多个画布，每个画布都使用自己的画笔）。提供使用几种画布的可能性，例如圆形和矩形

到目前为止，我写了这段代码，但我不知道如何在这里实现画布和特定形状画笔的创建

// abstract class - brush
abstract class Brush
{
    public abstract void Move ();
}
// abstract class canvas
abstract class Canvas
{
    public abstract void Draw ();
}

// class round brush stroke
class RoundBrush: Brush
{
    public override void Move ()
    {
        // paint with a round brush
    }
}
// square brush stroke
class SquareBrush: Brush
{
    public override void Move ()
    {
        // Draw with a square brush
    }
}
// create a round canvas
class RoundForm: Canvas
{
    public override void Draw ()
    {
        // Draw a round canvas (pictureBox)
    }
}
// create a square canvas
class SquareForm: Canvas
{
    public override void Draw ()
    {
        // Draw a square canvas (pictureBox)
    }
}
// abstract factory class
abstract class EditorFactory
{
    public abstract Brush CreateBrush ();
    public abstract Canvas CreateCanvas ();
}
// Factory to create a round canvas with a round brush
class RoundFactory: EditorFactory
{
    public override Brush CreateBrush ()
    {
        return new RoundBrush ();
    }

    public override Canvas CreateCanvas ()
    {
        return new RoundForm ();
    }
}
// Factory to create a square canvas with a square brush
class SquareFactory: EditorFactory
{
    public override Brush CreateBrush ()
    {
        return new SquareBrush ();
    }
    public override Canvas CreateCanvas ()
    {
        return new SquareForm ();
    }
}
// client
class Editor
{
    private Brush brush;
    private Canvas canvas;
    public Editor (EditorFactory factory)
    {
        brush = factory.CreateBrush ();
        canvas = factory.CreateCanvas ();
    }
    public void Move ()
    {
        brush.Move ();
    }
    public void Draw ()
    {
        canvas.Draw ();
    }
}


private void Form1_Shown (object sender, EventArgs e)
{

    Editor newEditor = new Editor (new RoundFactory ());
    newEditor.Move ();
    newEditor.Draw ();

    Editor editor = new Editor (new SquareFactory ());
    editor.Move ();
    editor.Draw ();
}

a） 这里的帖子似乎太宽了。b） 我真的不明白这里的“画布”是什么意思。c） 最终，您必须了解winforms中图形的可能性，更重要的是了解winforms中图形的限制。。