networkPaint/networkPaint/MainForm.cs

using networkPaint.Properties;

using System;
using System.Collections.Specialized;
using System.Drawing;
using System.Net;
using System.Windows.Forms;

namespace networkPaint
{
    public partial class MainForm : Form
    {
        WebClient client = new WebClient();
        Bitmap bitmap = new Bitmap(640, 480);
        Graphics graphics;

        Color color = Color.Black;
        string url = "http://kawaiizenbo.me/toys/networkpaint/";
        string versionString = "networkPaint/1.2";
        bool dragging = false;

        public MainForm()
        {
            InitializeComponent();
            paintArea.Image = bitmap;
            graphics = Graphics.FromImage(bitmap);
            client.Headers.Add("User-Agent", versionString);
            brushSizeNumericUpDown.Value = Settings.Default.size;
            color = intToRGB(Settings.Default.color);
            url = Settings.Default.url;
        }

        private void paintArea_MouseUp(object sender, MouseEventArgs e)
        {
            dragging = false;
        }

        private void paintArea_MouseDown(object sender, MouseEventArgs e)
        {
            dragging = true;
        }

        private void paintArea_MouseMove(object sender, MouseEventArgs e)
        {
            if (dragging)
            {
                NameValueCollection values = new NameValueCollection();
                values["color"] = rgbToInt(color).ToString();
                values["x"] = e.X.ToString();
                values["y"] = e.Y.ToString();
                values["size"] = brushSizeNumericUpDown.Value.ToString();
                client.UploadValues(url + "post.php", values);
            }
        }

        private void MainForm_Load(object sender, EventArgs e)
        {
            string validString;
            try
            {
                validString = client.DownloadString(urlTextBox.Text + "/valid.txt").Trim();
            }
            catch (Exception)
            {
                MessageBox.Show("This is not a valid networkPaint endpoint.");
                urlTextBox.Text = url;
                return;
            }
            if (validString == versionString) timer.Start();
            else MessageBox.Show($"Version mismatch! Server is designed for {validString} and you are running {versionString}");
        }

        private void timer_Tick(object sender, EventArgs e)
        {
            string responseString = client.DownloadString(url + "data.ppf");
            if (responseString.Trim() == "") return;
            graphics.Clear(Color.White);
            foreach (string packet in responseString.Split(';'))
            {
                try
                {
                    if (packet.Trim() == "") continue;
                    int color = int.Parse(packet.Split(',')[0]);
                    int x = int.Parse(packet.Split(',')[1]);
                    int y = int.Parse(packet.Split(',')[2]);
                    int size = int.Parse(packet.Split(',')[3]);
                    graphics.FillEllipse(new SolidBrush(intToRGB(color)), new Rectangle(x - size / 2, y - size / 2, size, size));
                }
                catch (Exception)
                {
                    continue;
                }
            }
            paintArea.Image = bitmap;
        }

        private void changeColorButton_Click(object sender, EventArgs e)
        {
            colorDialog.ShowDialog();
            color = colorDialog.Color;
            Settings.Default.color = rgbToInt(color);
            Settings.Default.Save();
        }

        private void setUrlButton_Click(object sender, EventArgs e)
        {
            string validString;
            try
            {
                validString = client.DownloadString(urlTextBox.Text + "/valid.txt").Trim();
            }
            catch (Exception)
            {
                MessageBox.Show("This is not a valid networkPaint endpoint.");
                urlTextBox.Text = url;
                return;
            }
            if (validString != versionString)
            {
                MessageBox.Show($"Version mismatch! Server is designed for {validString} and you are running {versionString}");
                urlTextBox.Text = url;
                return;
            }
            string tempURL = urlTextBox.Text;
            if (!tempURL.EndsWith("")) tempURL += "/";
            url = tempURL;
            Settings.Default.url = url;
            Settings.Default.Save();
            bitmap = new Bitmap(640, 480);
            paintArea.Image = bitmap;
            graphics = Graphics.FromImage(bitmap);
            timer.Start();
        }

        private void brushSizeNumericUpDown_ValueChanged(object sender, EventArgs e)
        {
            Settings.Default.size = (int)brushSizeNumericUpDown.Value;
            Settings.Default.Save();
        }

        public static int rgbToInt(Color color)
        {
            return ((255 & 0x0ff) << 24) | ((color.R & 0x0ff) << 16) | ((color.G & 0x0ff) << 8) | (color.B & 0x0ff);
        }

        public static Color intToRGB(int color)
        {
            return Color.FromArgb(0xFF, (color & 0x00FF0000) >> 16, (color & 0x0000FF00) >> 8, color & 0x000000FF);
        }
    }
}