// periodic call, fetches actual data and triggers autolanding function
private void updaterTimer_Tick(object sender, EventArgs e)
{
if (landingID != -1)
{
LandingState state = makeRequest(serverAddress + "/stav?id=" + landingID);
if (autoland)
{
calculateAutoLand(state); // autoland calculations
}
showState(state);
switch (state.state)
{
case LandingState.SUCCESS:
landingID = -1;
//MessageBox.Show("Přistání bylo úspěšné!", "Stav přistání", MessageBoxButtons.OK, MessageBoxIcon.Information);
enableControls();
break;
case LandingState.FAILURE:
landingID = -1;
//MessageBox.Show("Přistání se nezdařilo.", "Stav přistání", MessageBoxButtons.OK, MessageBoxIcon.Error);
enableControls();
break;
case LandingState.LANDING:
showData(state);
drawScheme(state);
lastState = state;
break;
}
}
}
// occurs when autolanding button is clicked
private void buttonStartAuto_Click(object sender, EventArgs e)
{
autoland = true;
serverAddress = textBoxAddress.Text;
lastState = makeRequest(serverAddress + "/start");
landingID = lastState.id;
disableControls();
}
// handles making requests to the server w/ parsing response into LandingState struct defined at the bottom
private LandingState makeRequest(string address)
{
string text = string.Empty;
// do HTTP request
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://" + address);
request.AutomaticDecompression = DecompressionMethods.GZip; // to be sure
using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
using (Stream stream = response.GetResponseStream())
using (StreamReader reader = new StreamReader(stream))
{
text = reader.ReadToEnd(); // get the response
}
LandingState result = new LandingState();
string[] linesArray = text.Split(new string[] { "\r\n", "\n" }, StringSplitOptions.None);
if (linesArray[0] == "Zdar!")
{
result.state = LandingState.SUCCESS;
return(result);
}
if (linesArray[0] == "Krach!")
{
result.state = LandingState.FAILURE;
return(result);
}
// parsing response into struct
result.state = LandingState.LANDING;
result.id = int.Parse(linesArray[0]);
result.moduleX = float.Parse(linesArray[1].Split(new char[] { ' ' })[0], CultureInfo.InvariantCulture);
result.moduleY = float.Parse(linesArray[1].Split(new char[] { ' ' })[1], CultureInfo.InvariantCulture);
result.velocityX = float.Parse(linesArray[2].Split(new char[] { ' ' })[0], CultureInfo.InvariantCulture);
result.velocityY = float.Parse(linesArray[2].Split(new char[] { ' ' })[1], CultureInfo.InvariantCulture);
result.fuel = float.Parse(linesArray[3], CultureInfo.InvariantCulture);
result.landingL = float.Parse(linesArray[4].Split(new char[] { ' ' })[0], CultureInfo.InvariantCulture);
result.landingR = float.Parse(linesArray[4].Split(new char[] { ' ' })[1], CultureInfo.InvariantCulture);
return(result);
}
private void Form1_Load(object sender, EventArgs e)
{
// start landing automatically if called from command line
string[] args = Environment.GetCommandLineArgs();
if (args.Length == 3)
{
autoland = true;
maxSpeed = int.Parse(args[2]);
textBoxAddress.Text = args[1];
serverAddress = args[1];
lastState = makeRequest(serverAddress + "/start");
landingID = lastState.id;
disableControls();
}
}
// output the data into information labels
private void showData(LandingState state)
{
labelID.Text = "ID: " + state.id.ToString();
labelX.Text = "X: " + Math.Round(state.moduleX, 1).ToString();
labelY.Text = "Y: " + Math.Round(state.moduleY, 1).ToString();
if (state.velocityX > -5 && state.velocityX < 5)
{
labelVX.ForeColor = Color.Green;
}
if (state.velocityX < -5 || state.velocityX > 5)
{
labelVX.ForeColor = Color.Red;
}
labelVX.Text = "vX: " + Math.Round(state.velocityX, 1).ToString();
if (state.velocityY > -5)
{
labelVY.ForeColor = Color.Green;
}
if (state.velocityY < -5)
{
labelVY.ForeColor = Color.Red;
}
labelVY.Text = "vY: " + Math.Round(state.velocityY, 1).ToString();
if (state.fuel < 5)
{
labelFuel.ForeColor = Color.Red;
}
if (state.fuel > 5 && state.fuel < 10)
{
labelFuel.ForeColor = Color.Orange;
}
if (state.fuel > 10)
{
labelFuel.ForeColor = Color.Green;
}
labelFuel.Text = "P: " + Math.Round(state.fuel, 1).ToString();
labelLandingL.Text = "L: " + Math.Round(state.landingL, 1).ToString();
labelLandingR.Text = "R: " + Math.Round(state.landingR, 1).ToString();
}
// draw the picture of the situation
private void drawScheme(LandingState state)
{
Bitmap bmp = new Bitmap(2000, 2000);
using (Graphics g = Graphics.FromImage(bmp))
{
g.Clear(Color.Transparent);
}
scheme.Image = bmp;
using (Graphics g = Graphics.FromImage(scheme.Image))
{
g.DrawLine(new Pen(Color.Black, 20), state.landingL * 10, 2000, state.landingR * 10, 2000);
object o = Resources.ResourceManager.GetObject("lunarModule");
Image lunarModule = (Image)o;
g.DrawImage(lunarModule, 10 * state.moduleX, 2000 - 10 * state.moduleY - 70);
}
}
// show colored state info
private void showState(LandingState state)
{
switch (state.state)
{
case LandingState.LANDING:
labelState.Text = "Přistání probíhá...";
labelState.ForeColor = Color.Orange;
break;
case LandingState.SUCCESS:
labelState.Text = "Přistání bylo úspěšné!";
labelState.ForeColor = Color.Green;
break;
case LandingState.FAILURE:
labelState.Text = "Přistání se nezdařilo.";
labelState.ForeColor = Color.Red;
break;
}
labelState.Visible = true;
}
// calculates autolanding moves and sends the requests
private void calculateAutoLand(LandingState state)
{
bool thrustUp = false;
bool thrustLeft = false;
bool thrustRight = false;
// vertical
if ((state.velocityY < -4 && state.moduleY < 40) ||
(state.velocityY < -8 && state.moduleY < 100) ||
(state.velocityY < -12 && state.moduleY < 150) ||
(state.velocityY < -15 && state.moduleY < 160))
{
thrustUp = true;
}
// to fit the board
if ((state.moduleX - 20 < state.landingL))
{
thrustRight = true;
}
if ((state.moduleX + 20 > state.landingR))
{
thrustLeft = true;
}
// horizontal overspeed
if ((state.velocityX > 5))
{
thrustRight = false;
thrustLeft = true;
}
if ((state.velocityX < -5))
{
thrustRight = true;
thrustLeft = false;
}
// create and send the request
string url = serverAddress + "/stav?id=" + landingID;
if (thrustUp)
{
url += "&nahoru=1";
}
else
{
url += "&nahoru=0";
}
if (thrustLeft)
{
url += "&doleva=1";
}
else
{
url += "&doleva=0";
}
if (thrustRight)
{
url += "&doprava=1";
}
else
{
url += "&doprava=0";
}
makeRequest(url);
}
