简单的画图板,如何改进,让线条连续?

private Point LastPoint { get; set; }

private void Form1_MouseMove(object sender, MouseEventArgs e)

{

label2.Text = "x:" + e.X;

label3.Text = "y:" + e.Y;

if (drawing == true)

{

Graphics graphics = CreateGraphics();

SolidBrush brush = new SolidBrush(color);

if (LastPoint == null)

graphics.FillEllipse(brush, e.X, e.Y, size, size);

else

graphics.DrawLine(new Pen(brush, size), LastPoint, new Point(e.X, e.Y));

}

LastPoint = new Point(e.X, e.Y);

}

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