gdipbrushes.cs

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namespace GDIPlus.GDIPBrushes {
    using System;
    using System.Drawing;
    using System.Drawing.Drawing2D;
    using System.IO;
    using System.Reflection;
    using System.Windows.Forms;

    public class BrushesSample : System.Windows.Forms.Form {
        /// <summary>
        ///    必需的设计器变量
        /// </summary>+
        private System.ComponentModel.Container components;

        private System.Drawing.Brush backgroundBrush;

        public BrushesSample() {

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

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

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

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

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

            g.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);

            //添加一个红色长方形和一个与之重叠的黄色长方形
            g.FillRectangle(new SolidBrush(Color.Red), 20, 20, 50, 50);
            g.FillRectangle(new SolidBrush(Color.FromArgb(180, Color.Yellow)), 40, 40, 50, 50);

            //添加一个充满半透明阴影图案的圆圈
            HatchBrush hb = new HatchBrush(HatchStyle.ForwardDiagonal, Color.Green, Color.FromArgb(100, Color.Yellow));
            g.FillEllipse(hb, 250, 10, 100, 100);

            //现在创建一个用渐变画笔填充的长方形
            Rectangle r = new Rectangle(300, 250, 100, 100);
            LinearGradientBrush lb = new LinearGradientBrush(r, Color.Red, Color.Yellow,LinearGradientMode.BackwardDiagonal);
            g.FillRectangle(lb, r);

            //现在添加一个用线条渐变画笔绘制的图形
            GraphicsPath path = new GraphicsPath(new Point[] {
                                                                new Point(40, 140),
                                                                new Point(275, 200),
                                                                new Point(105, 225),
                                                                new Point(190, 300),
                                                                new Point(50, 350),
                                                                new Point(20, 180),
                                                            },
                                                new byte[] {
                                                                (byte)PathPointType.Start,
                                                                (byte)PathPointType.Bezier,
                                                                (byte)PathPointType.Bezier,
                                                                (byte)PathPointType.Bezier,
                                                                (byte)PathPointType.Line,
                                                                (byte)PathPointType.Line,
                                                            }
            );

            PathGradientBrush pgb = new PathGradientBrush(path);
            pgb.SurroundColors = new Color[] {
                                                Color.Green,
                                                Color.Yellow,
                                                Color.Red,
                                                Color.Blue,
                                                Color.Orange,
                                                Color.White,
            };

            g.FillPath(pgb, path);

            //现在添加一个已被旋转的简单长方形
            g.RotateTransform(-30);
            g.FillRectangle(new SolidBrush(Color.SlateBlue), 100, 250, 75, 100);
            g.ResetTransform();
        }

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

        /// <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>
        private void InitializeComponent () {
            this.components = new System.ComponentModel.Container ();
            this.Text = "GDI+ 笔刷示例";
            this.Size = new System.Drawing.Size(450, 400);
        }

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