猪猪SOFT

winform GDI 画图并保存图片

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

namespace GDITest
{

    public partial class Form1 : Form
    {

        Bitmap bmp;

        public Form1()
        {
            InitializeComponent();
        }

        private void menuSaveImage_Click(object sender, EventArgs e)
        {
            SaveFileDialog saveFileDialog1 = new SaveFileDialog();
            saveFileDialog1.Filter = "JPeg Image|*.jpg|Png Image|*.png|Bitmap Image|*.bmp|Gif Image|*.gif";
            saveFileDialog1.Title = "图片另存为";
            saveFileDialog1.ShowDialog();
            if (saveFileDialog1.FileName != "")
            {
                // Saves the Image via a FileStream created by the OpenFile method.  
                System.IO.FileStream fs =
                (System.IO.FileStream)saveFileDialog1.OpenFile();
                // Saves the Image in the appropriate ImageFormat based upon the  
                // File type selected in the dialog box.  
                // NOTE that the FilterIndex property is one-based.  
                switch (saveFileDialog1.FilterIndex)
                {
                    case 1:
                        this.pic.Image.Save(fs,
                           System.Drawing.Imaging.ImageFormat.Jpeg);
                        break;
                    case 2:
                        this.pic.Image.Save(fs,
                           System.Drawing.Imaging.ImageFormat.Png);
                        break;

                    case 3:
                        this.pic.Image.Save(fs,
                           System.Drawing.Imaging.ImageFormat.Bmp);
                        break;

                    case 4:
                        this.pic.Image.Save(fs,
                           System.Drawing.Imaging.ImageFormat.Gif);
                        break;
                }

                fs.Close();
                MessageBox.Show("保存完毕!");
            } 

        }

        private void Form1_Load(object sender, EventArgs e)
        {
            //Graphics g = this.pic.CreateGraphics();
            //g.Clear(this.pic.BackColor);

            // 892*644

            bmp = new Bitmap(pic.Width, pic.Height); 
            Graphics g = Graphics.FromImage(bmp);
            g.Clear(Color.White);

            Pen pen = new Pen(Color.Black, 2);
            pen.StartCap = System.Drawing.Drawing2D.LineCap.Round;
            g.DrawLine(pen, 0, 0, 0, 644);

            g.DrawRectangle(Pens.Black, pic.Width / 2 - 10, 0, 100, 30);

            g.DrawString("GDI Test", new Font("宋体", 12), Brushes.Black, new PointF(pic.Width/2, 5));

            g.DrawEllipse(pen, pic.Width / 2, pic.Height / 2, 30, 30);

            // pic为picturebox图片控件
            pic.Image = bmp;

        }

    }

}