gdipimages.cs

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namespace GDIPlus.GDIPImages {
    using System;
    using System.Windows.Forms;
    using System.IO;
    using System.Net;
    using System.Drawing;
    using System.Drawing.Drawing2D;
    using System.Drawing.Imaging;
    using System.Drawing.Text;
    using System.Reflection;

    public class ImagesSample : System.Windows.Forms.Form {
        /// <summary>
        ///    必需的设计器变量
        /// </summary>
        private System.ComponentModel.Container components;
        protected internal System.Windows.Forms.Button button1;

        private System.Drawing.Brush backgroundBrush;
        private System.Drawing.Image sample1;
        private System.Drawing.Image webLogo;
        private System.Drawing.Image createdImage;

        private FontFamily serifFontFamily;

        public ImagesSample() {

            //
            // Windows 窗体设计器支持所必需的
            //
            InitializeComponent();

            serifFontFamily = new FontFamily (GenericFontFamilies.Serif);

            this.SetStyle(System.Windows.Forms.ControlStyles.Opaque, true);

            Image backgroundImage;

            //从可执行文件的资源分支中加载要用于背景的图像
            backgroundImage = new Bitmap(System.Reflection.Assembly.GetExecutingAssembly().GetManifestResourceStream("colorbars.jpg"));

            //现在创建要用于绘制背景的画笔
            backgroundBrush = new TextureBrush(backgroundImage);

            //现在加载要使用的其他图像
            sample1 = new Bitmap("sample.jpg");

            //从 Web 上加载图像并进行显示。如果失败，请从本地资源中加载图像
            try {
                WebRequest request = WebRequest.Create("http://www.microsoft.com/net/images/bnrWindowsNgws1.gif");
                request.Credentials = CredentialCache.DefaultCredentials;

                Stream source = request.GetResponse().GetResponseStream();
                MemoryStream ms = new MemoryStream();

                byte[] data = new byte[256];
                int c = source.Read(data, 0, data.Length);

                while (c > 0) {
                    ms.Write(data, 0, c);
                    c = source.Read(data, 0, data.Length);
                }

                source.Close();
                ms.Position = 0;
                webLogo = new Bitmap(ms);

            } catch(Exception) {
                // MessageBox.Show（"未能从 Web 上加载图像 - 请使用默认图像\n\n " + ex.Message + " \n\n" + ex.StackTrace, "错误");
                webLogo = sample1;
            }

            //为呈现位图的按钮启动事件处理程序
            button1.Click += new System.EventHandler(DrawImage);

        }


        //按下按钮时激发
        private void DrawImage(object sender, EventArgs e) {

            Bitmap newBitmap = null;
            Graphics g = null ;

            try {
                newBitmap = new Bitmap(800,600,PixelFormat.Format32bppArgb);
                g = Graphics.FromImage(newBitmap);
                g.FillRectangle(new SolidBrush(Color.White), new Rectangle(0,0,800,600));

                Font textFont = new Font(serifFontFamily, 12);
                RectangleF rectangle = new RectangleF(100, 100, 250, 350);
                string flowedText="我去了圣詹姆斯医院，\n到那里去看望我的爱人，\n她平躺在一张白色的桌子上，\n看上去是那么甜美、那么冰冷、那么美丽，\n让她去吧，让她去吧，愿上帝保佑她，\n不论她去哪里，\n她都可以俯瞰这个广阔的世界，\n但她永远不会找到一个像我这样的好男人，\n当我死时，希望你给我穿上整齐的系带鞋，\n我想穿一件直筒外套，戴一顶宽边帽，\n在我的表链上放上一个二十美元的金币，\n这样男孩们将知道我是站着死的。";

                g.FillRectangle(new SolidBrush(Color.Gainsboro), rectangle);
                g.DrawString(flowedText, textFont, new SolidBrush(Color.Blue), rectangle);
                Pen penExample = new Pen(Color.FromArgb(150, Color.Purple), 20);
                penExample.DashStyle = DashStyle.Dash;
                penExample.StartCap = LineCap.Round;
                penExample.EndCap = LineCap.Round;
                g.DrawCurve(penExample, new Point[] {
                            new Point(200, 140),
                            new Point(700, 240),
                            new Point(500, 340),
                            new Point(140, 140),
                            new Point(40, 340),
                            });

                newBitmap.Save("TestImage.png", ImageFormat.Png) ;

                MessageBox.Show("已完成 - 图像已写入 TestImage.png");

                //添加要绘制和重新绘制的图像
                createdImage = newBitmap;
                this.Invalidate();

            } finally {

                //注意：必须在处置该位图
                //之前处置图形对象

                //当不再需要所创建的
                //图形对象时要对其进行处置
                if (null != g) {
                    g.Dispose();
                }

                //通常在此处处置该位图
                //但因为我们打算在窗体
                //上显示它，所以先不做处置
                // if (null != newBitmap) {
                //     newBitmap.Dispose();
                // }
            }

        }


        protected override void OnPaint(PaintEventArgs e) {
            Graphics g = e.Graphics;

            e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;

            //用粗画笔填充背景
            //然后应用白色涂料
            g.FillRectangle(backgroundBrush, ClientRectangle);
            g.FillRectangle(new SolidBrush(Color.FromArgb(180, Color.White)), ClientRectangle);

            //只需呈现图像
            g.DrawImage(sample1, 29, 20, 283, 212);

            //现在旋转该图像并显示它
            g.RotateTransform(-30);
            g.DrawImage(webLogo, 175, 420);
            g.ResetTransform();

            //最后，对所创建的图像进行绘制（如果有该图像的话）
            if (createdImage != null) {
                g.DrawImage(createdImage, 50, 200, 200, 200);
            }
        }


        /// <summary>
        ///    清理正在使用的所有资源
        /// </summary>
        protected override void Dispose(bool disposing)
        {
           if (disposing) {
                if (components != null) {
                    components.Dispose();
                }
           }
           base.Dispose(disposing);
        }

        /// <summary>
        ///    设计器支持所必需的方法，不要使用
        ///    代码编辑器修改此方法的内容
        /// </summary>
        void InitializeComponent () {
            this.components = new System.ComponentModel.Container ();
            this.button1 = new System.Windows.Forms.Button ();
            this.Size = new System.Drawing.Size(750, 500);
            this.Text = "GDI+ 图像示例";
            button1.TabIndex = 0;
            button1.Text = "将位图绘制到文件";
            button1.Size = new System.Drawing.Size(100,50);
            button1.Location = new System.Drawing.Point(600,20);
            this.Controls.Add(button1);
        }

        /// <summary>
        /// 应用程序的主入口点
        /// </summary>
        [STAThread]
        public static void Main() {
            Application.Run(new ImagesSample());
        }
    }
}