大きさを変えられるウィンドウ

using System;

using System.Windows.Forms;

using System.Drawing;

using Microsoft.DirectX;

using Microsoft.DirectX.DirectDraw;



namespace MDDraw

{

    class DirectDrawForm : Form

    {

        /// <summary>

        /// Surfaceが新しく作り替えた時に起こる

        /// </summary>

        event EventHandler SurfaceChange;



        protected Device device_;

        protected Surface primarySurface_;

        protected Surface secondarySuface_;

        protected Clipper clipper_;



        public DirectDrawForm()

            : base()

        {

            this.directDrawInitialize();

            this.SurfaceInitialize();

            this.MinimumSize = new Size(80, 60);

            this.SizeChanged += new EventHandler(DirectDrawForm_SizeChanged);

        }





        void DirectDrawForm_SizeChanged(object sender, EventArgs e)

        {

            if (WindowState != FormWindowState.Minimized)

            {

                this.SurfaceInitialize();

            }

        }







        /// <summary>

        /// DirectDrawの初期化を行います。

        /// </summary>

        private void directDrawInitialize()

        {

            //デバイスを作成

            device_ = new Device();



        }

        /// <summary>

        /// Surfaceの初期化を行います

        /// </summary>

        private void SurfaceInitialize()

        {

            if (secondarySuface_ != null) secondarySuface_.Dispose();

            if (primarySurface_ != null) primarySurface_.Dispose();

            if (clipper_ != null) clipper_.Dispose();

            //サーフィスを作成するための情報

            SurfaceCaps caps = new SurfaceCaps();

            SurfaceDescription desc = new SurfaceDescription();



            //デバイスの協調レベルを設定

            device_.SetCooperativeLevel(this, CooperativeLevelFlags.Normal);





            //プライマリサーフィスの作成

            caps.PrimarySurface = true;

            desc.SurfaceCaps = caps;

            primarySurface_ = new Surface(desc, device_);



            //情報をリセット（セカンダリサーフィスを作るため）

            caps.Clear();

            desc.Clear();



            //セカンダリサーフィスの作成

            desc.Width = ClientSize.Width;

            desc.Height = ClientSize.Height;

            desc.SurfaceCaps = caps;

            secondarySuface_ = new Surface(desc, device_);



            //クリッパーの作成

            clipper_ = new Clipper(device_);

            clipper_.Window = this;



            //プライマリサーフェスにクリッパーをセット

            primarySurface_.Clipper = clipper_;





            if (SurfaceChange != null) SurfaceChange(this, new EventArgs());

        }



        /// <summary>

        /// 現在の状態に応じた方法でSurfaceをフリップします

        /// </summary>

        protected void SurfaceFlip()

        {

            //非表示時と最小化時は描画しない。（下の２行が無いとエラー起こします）

            if (!this.Visible) return;

            if (this.WindowState == FormWindowState.Minimized) return;

            Rectangle rect = new Rectangle();



            rect.Size = this.ClientSize;

            rect.Location = this.PointToScreen(this.ClientRectangle.Location);

            primarySurface_.Draw(rect, secondarySuface_, DrawFlags.Wait);

        }



    }





}