笔刷用Pen类表示，使用Pen后，必须释放资源。如下例
private void Form1_Paint(object sender, PaintEventArgs e)
{
Graphics g = e.Graphics;
g.FillRectangle(Brushes.White, this.ClientRectangle);
Pen p = new Pen(Color.Black);
g.DrawLine(p, 0, 0, 100, 100);
p.Dispose();
}
可以设置Pen的线宽和对齐方式
private void Form1_Paint(object sender, PaintEventArgs e)
{
Graphics g = e.Graphics;
g.FillRectangle(Brushes.White, this.ClientRectangle);
Pen p = new Pen(Color.Black,3);
p.Alignment=.PenAlignment.Center;
g.DrawRectangle(p,3,3,8,7);
p.Dispose();
}
设置画笔的点划线属性用DashStyle属性
private void Form1_Paint(object sender, PaintEventArgs e)
{
Graphics g = e.Graphics;
g.FillRectangle(Brushes.White, this.ClientRectangle);
Pen p = new Pen(Color.Black,2);
p.DashStyle = DashStyle.Dash;
g.DrawLine(p, 3, 3, 100, 3);
p.Dispose();
}
