www.pudn.com > motion_src.zip > CameraWindow.cs

using System; 
using System.Collections; 
using System.ComponentModel; 
using System.Drawing; 
using System.Data; 
using System.Windows.Forms; 
using System.Threading; 
 
namespace motion 
{ 
	/// 
 
	/// Summary description for CameraWindow. 
	/// 
 
	public class CameraWindow : System.Windows.Forms.Control 
	{ 
		private Camera	camera = null; 
		private bool	autosize = false; 
		private bool	needSizeUpdate = false; 
		private bool	firstFrame = true; 
 
		// AutoSize property 
		[DefaultValue(false)] 
		public bool AutoSize 
		{ 
			get { return autosize; } 
			set 
			{ 
				autosize = value; 
				UpdatePosition(); 
			} 
		} 
 
		// Camera property 
		[Browsable(false)] 
		public Camera Camera 
		{ 
			get { return camera; } 
			set 
			{ 
				// lock 
				Monitor.Enter(this); 
 
				// detach event 
				if (camera != null) 
				{ 
					camera.NewFrame -= new EventHandler(camera_NewFrame); 
				} 
 
				camera = value; 
				needSizeUpdate = true; 
				firstFrame = true; 
 
				// atach event 
				if (camera != null) 
				{ 
					camera.NewFrame += new EventHandler(camera_NewFrame); 
				} 
 
				// unlock 
				Monitor.Exit(this); 
			} 
		} 
 
		// Constructor 
		public CameraWindow() 
		{ 
			SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.DoubleBuffer | 
				ControlStyles.ResizeRedraw | ControlStyles.UserPaint, true); 
		} 
 
		// Paint control 
		protected override void OnPaint(PaintEventArgs pe) 
		{ 
			if ((needSizeUpdate) || (firstFrame)) 
			{ 
				UpdatePosition(); 
				needSizeUpdate = false; 
			} 
 
			// lock 
			Monitor.Enter(this); 
 
			Graphics	g = pe.Graphics; 
			Rectangle	rc = this.ClientRectangle; 
			Pen			pen = new Pen(Color.Black, 1); 
 
			// draw rectangle 
			g.DrawRectangle(pen, rc.X, rc.Y, rc.Width - 1, rc.Height - 1); 
 
			if (camera != null) 
			{ 
				camera.Lock(); 
 
				// draw frame 
				if (camera.LastFrame != null) 
				{ 
					g.DrawImage(camera.LastFrame, rc.X + 1, rc.Y + 1, rc.Width - 2, rc.Height - 2); 
					firstFrame = false; 
				} 
				else 
				{ 
					// Create font and brush 
					Font drawFont = new Font("Arial", 12); 
					SolidBrush drawBrush = new SolidBrush(Color.White); 
 
					g.DrawString("Connecting ...", drawFont, drawBrush, new PointF(5, 5)); 
 
					drawBrush.Dispose(); 
					drawFont.Dispose(); 
				} 
 
				camera.Unlock(); 
			} 
 
			pen.Dispose(); 
 
			// unlock 
			Monitor.Exit(this); 
 
			base.OnPaint(pe); 
		} 
 
		// Update position and size of the control 
		public void UpdatePosition() 
		{ 
			// lock 
			Monitor.Enter(this); 
 
			if ((autosize) && (this.Parent != null)) 
			{ 
				Rectangle	rc = this.Parent.ClientRectangle; 
				int			width = 320; 
				int			height = 240; 
 
				if (camera != null) 
				{ 
					camera.Lock(); 
 
					// get frame dimension 
					if (camera.LastFrame != null) 
					{ 
						width = camera.LastFrame.Width; 
						height = camera.LastFrame.Height; 
					} 
					camera.Unlock(); 
				} 
 
				// 
				this.SuspendLayout(); 
				this.Location = new Point((rc.Width - width - 2) / 2, (rc.Height - height - 2) / 2); 
				this.Size = new Size(width + 2, height + 2); 
				this.ResumeLayout(); 
 
			} 
			// unlock 
			Monitor.Exit(this); 
		} 
 
		// On new frame ready 
		private void camera_NewFrame(object sender, System.EventArgs e) 
		{ 
			Invalidate(); 
		} 
	} 
}