C# 滚动拉伸的图像

我的c#windows窗体应用程序中有一个picturebox，我还编写了一些代码，可以改变picturebox的高度和宽度，基本上可以放大。但是，这只关注右上角区域，我希望用户能够使用滚动条将地图滚动到他们需要的区域

每当我放大，然后使用滚动条时，我的图像将变为默认大小，然后仅以该大小滚动

如何移动整个图像，以便用户可以平移picturebox地图

这是我的密码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Mapping_Application
{
    public partial class Form1 : Form
    {
        //Declare zoom variable counter
        int zoom;
        //Main Void
        public Form1()
        {
            InitializeComponent();
        }

        //Zoom In
        private void button1_Click(object sender, EventArgs e)
        {
            if(zoom != 3)
            {
                pictureBox1.Height = pictureBox1.Height * 2;
                pictureBox1.Width = pictureBox1.Width * 2;
                zoom = zoom + 1;
            }            
        }

        //Zoom out
        private void button2_Click(object sender, EventArgs e)
        {
            if (zoom != 0)
            {
                pictureBox1.Height = pictureBox1.Height / 2;
                pictureBox1.Width = pictureBox1.Width / 2;
                zoom = zoom -= 1;
            }
        }

        //The horizontal scrollbar
        private void horizontal_Scroll(object sender, ScrollEventArgs e)
        {
            //Create a graphics object and draw a portion of the image in the PictureBox.
            Graphics g = pictureBox1.CreateGraphics();

            int x;
            int y;

            if (e.ScrollOrientation == ScrollOrientation.HorizontalScroll)
            {
                x = e.NewValue * 19;
                y = vertical.Value * 19;
            }
            else //e.ScrollOrientation == ScrollOrientation.VerticalScroll
            {
                y = e.NewValue * 19;
                x = horizontal.Value * 19;
            }

            g.Clear(Color.White);

            g.DrawImage(pictureBox1.Image,
              new Rectangle(0, 0, pictureBox1.Width, pictureBox1.Width),  //where to draw the image
              new Rectangle(x, y, pictureBox1.Width, pictureBox1.Width),  //the portion of the image to draw
              GraphicsUnit.Pixel);

            pictureBox1.Update();
        }

        //The vertical scrollbar
        private void vertical_Scroll(object sender, ScrollEventArgs e)
        {
            //Create a graphics object and draw a portion of the image in the PictureBox.
            Graphics g = pictureBox1.CreateGraphics();

            int x;
            int y;

            if (e.ScrollOrientation == ScrollOrientation.HorizontalScroll)
            {
                x = e.NewValue * 19;
                y = vertical.Value * 19;
            }
            else //e.ScrollOrientation == ScrollOrientation.VerticalScroll
            {
                y = e.NewValue * 19;
                x = horizontal.Value * 19;
            }

            g.Clear(Color.White);

            g.DrawImage(pictureBox1.Image,
              new Rectangle(0, 0, pictureBox1.Width, pictureBox1.Width),  //where to draw the image
              new Rectangle(x, y, pictureBox1.Width, pictureBox1.Width),  //the 
portion of the image to draw
              GraphicsUnit.Pixel);

            pictureBox1.Update();
        }
    }
}

---

滚动条目前似乎可以工作，但仅用于放大。没有缩放负片功能，我使用一个名为zoom的变量来存储程序所处的缩放级别。无法缩放到-2x，因此如果（缩放！=0）

将pbox设置为缩放；将其嵌套在面板中。将面板设置为自动滚动。要放大或缩小pbox，使其变大或变小，我将尝试一下。谢谢。@TaW这个有用。谢谢