C#实现将像素转换为页面单位的方法

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;
namespace advanced_drawing
{
  public partial class Form3 : Form
  {
    public Form3()
    {
      InitializeComponent();
    }
    private void button1_Click(object sender, EventArgs e)
    {
      Graphics g = this.CreateGraphics();
      g.PageUnit = GraphicsUnit.Inch;
      g.PageScale = 1;
      PointF[] bottomRight = new PointF[] { new PointF(this.ClientSize.Width, this.ClientSize.Height) };
      g.TransformPoints(CoordinateSpace.Page, CoordinateSpace.Device, bottomRight);
      Rectangle rect = new Rectangle(0, 0, 10, 10);
      Pen pen=new Pen(Color.Red);
      g.DrawRectangle(pen, rect);
    }
  }
}