using System;
using System.Drawing;
using AForge.Controls;
using System.Windows.Forms;
using AForge.Video.DirectShow;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;

namespace WebCamTest
{
    public partial class WebCamTest : Form
    {
        VideoSourcePlayer videoSourcePlayer;
        FilterInfoCollection videoDevices;

        public WebCamTest()
        {
            InitializeComponent();

            videoSourcePlayer = new VideoSourcePlayer();

            try
            {
                videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);

                if (videoDevices.Count == 0)
                    throw new ApplicationException();

                foreach (FilterInfo device in videoDevices)
                {
                    devicesCombo.Items.Add(device.Name);
                }
            }
            catch (ApplicationException)
            {
                devicesCombo.Items.Add("No local capture devices");
                devicesCombo.Enabled = false;
                takePictureBtn.Enabled = false;
            }

            devicesCombo.SelectedIndex = 0;

            VideoCaptureDevice videoCaptureSource = new VideoCaptureDevice(videoDevices[devicesCombo.SelectedIndex].MonikerString);
            videoSourcePlayer.VideoSource = videoCaptureSource;
            videoSourcePlayer.Start();
        }

        private void takePictureBtn_Click(object sender, EventArgs e)
        {
            DateTime time = DateTime.Now;
            string format = "MMM ddd d HH mm yyyy";
            String strFilename = "Capture-" + time.ToString(format) + ".jpg";
            if (videoSourcePlayer.IsRunning)
            {
                using (Bitmap picture = videoSourcePlayer.GetCurrentVideoFrame())
                using (Bitmap pictureResized = ResizeBitmap(picture, 320, 240))
                {
                    pictureResized.Save(strFilename, ImageFormat.Jpeg);
                    labelSaved.Text = "Capture Saved : " + strFilename;
                }
            }
        }

        private Bitmap ResizeBitmap(Bitmap originalBitmap, int newWidth, int newHeight)
        {
            int sourceWidth = originalBitmap.Width;
            int sourceHeight = originalBitmap.Height;
            int sourceX = 0;
            int sourceY = 0;
            int destX = 0;
            int destY = 0;

            float nPercent = 0;
            float nPercentW = 0;
            float nPercentH = 0;

            nPercentW = ((float)newWidth / (float)sourceWidth);
            nPercentH = ((float)newHeight / (float)sourceHeight);

            if (nPercentH < nPercentW)
            {
                nPercent = nPercentH;
                destX = Convert.ToInt16((newWidth - (sourceWidth * nPercent)) / 2);
            }
            else
            {
                nPercent = nPercentW;
                destY = Convert.ToInt16((newHeight - (sourceHeight * nPercent)) / 2);
            }

            int destWidth = (int)(sourceWidth * nPercent);
            int destHeight = (int)(sourceHeight * nPercent);

            Bitmap bmPhoto = new Bitmap(newWidth, newHeight, PixelFormat.Format24bppRgb);
            bmPhoto.SetResolution(originalBitmap.HorizontalResolution, originalBitmap.VerticalResolution);

            Graphics grPhoto = Graphics.FromImage(bmPhoto);
            grPhoto.Clear(Color.Black);
            grPhoto.InterpolationMode = InterpolationMode.HighQualityBicubic;

            grPhoto.DrawImage(
                originalBitmap,
                new Rectangle(destX, destY, destWidth, destHeight),
                new Rectangle(sourceX, sourceY, sourceWidth, sourceHeight),
                GraphicsUnit.Pixel);

            grPhoto.Dispose();

            return bmPhoto;
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            videoSourcePlayer.SignalToStop();
            videoSourcePlayer.WaitForStop();
            videoDevices = null;
        }

        private void devicesCombo_SelectedIndexChanged(object sender, EventArgs e)
        {
            videoSourcePlayer.SignalToStop();
            videoSourcePlayer.WaitForStop();
            VideoCaptureDevice videoCaptureSource = new VideoCaptureDevice(videoDevices[devicesCombo.SelectedIndex].MonikerString);
            videoSourcePlayer.VideoSource = videoCaptureSource;
            videoSourcePlayer.Start();
        }
    }
}