Graphics和image的问题..急

Question

我程序如下,我想将我的picturebox1中的Graphics储存成image进行缩放
请教
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        bool a = false;
        static int i = 0;
        Point[] newpo = new Point[500];
        Pen myPen = new Pen(Color.Black, 3);
        Graphics myGraphics ;
        public Bitmap m_bmpPic;
        public Image img;
        public Form1()
        {
            InitializeComponent();
        }        private void button1_Click(object sender, EventArgs e)
        {
            this.Refresh();
        }        private void panel1_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                a = true;
            }
        }        private void panel1_MouseMove(object sender, MouseEventArgs e)
        {
            if (a)
            {
                if (myGraphics == null)
                {
                    myGraphics = pictureBox1.CreateGraphics();
                }
                //myGraphics = this.CreateGraphics();
                if (i == 0)
                {
                    newpo[0].X = e.X;
                    newpo[0].Y = e.Y;
                    myGraphics.DrawEllipse(myPen, newpo[0].X, newpo[0].Y, 2, 2);
                    i++;
                }
                else if (i > 0 && i < 500)
                {
                    newpo[i].X = e.X;
                    newpo[i].Y = e.Y;
                    myGraphics.DrawLine(myPen, newpo[i - 1], newpo[i]);
                    i++;
                }
                else if (i == 500)
                {
                    i = 0;
                    newpo[0].X = e.X;
                    newpo[0].Y = e.Y;
                    myGraphics.DrawLine(myPen, newpo[499], newpo[0]);
                    i++;
                }            }
        }        private void panel1_MouseUp(object sender, MouseEventArgs e)
        {
            a = false;
            i = 0;
        }        private void button2_Click(object sender, EventArgs e)
        {
            //picturebox的Graphics转成image
        }
    }
}

Answer 1

myGraphics = Graphics.FromImage(pictureBox1.Image);
這樣獲取

Answer 2

是把Image进行缩放显示在pictureBox里,pictrueBox大小变化吗？

Answer 3

还可以用Image.FromFile和Image.FromStream

Answer 4

不记得是Image还是picturebox里面好像有缩放的选项方法

Answer 5

利用graphics对象重绘image;
g.DrawImage(oImage,new Rectangle(0,0,tWidth,tHeight),new Rectangle(0,0,oWidth,oHeight),GraphicsUnit.Pixel);