C#画布的创建和圆的画法

创建画布的3种方法：

1.最常用的就是Button按钮，方便刷新时间

Private void button1_Click (object Sender, EventArgs e)

{

Graphics  g=this.CreateGraphics();

}

2.Paint控件的应用：

 protected override void OnPaint(PaintEventArgs e)

        {

            base.OnPaint(e);

            g = e.Graphics;

}

3.  Panel 控件用于为其他控件提供可识别的分组,可以用作画布

private void panel1_Paint(object sender, PaintEventArgs e)
        {
            Graphics g = this.CreateGraphics();
        }

画圆的几种画法：

  private void button1_Click_1(object sender, EventArgs e)
        {
            Graphics g = this.CreateGraphics();
            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
            
            g.TranslateTransform((float)(40), (float)(40));
            g.FillEllipse(new SolidBrush(Color.Green), 120, 120, 200, 200);
          
            Pen pen = new Pen(Color.Gold, 2);
            g.DrawEllipse(pen, 120, 120, 200, 200);
        }

private void pictureBox1_Click(object sender, EventArgs e)
        {

            Graphics g = this.CreateGraphics();
            g.TranslateTransform((float)(100), (float)(100));
            Pen pen = new Pen(Color.Gold, 2);
            g.DrawEllipse(pen, 10, 10, 200, 200);
        }