public GroundTrack(Form parent)
{
InitializeComponent();
speed = 0;
MdiParent = parent;
histories = new List <stateHistory>();
StartTime = 0.0f;
EndTime = 100.0f;
CurrTime = 50.0f;
satellitePointRadius = 4;
lastRender = DateTime.Now;
// Reduce flickering - double buffer
DoubleBuffered = true;
// Create sample histories
stateHistory h1 = new stateHistory();
stateHistory h2 = new stateHistory();
h1.name = "Test 1";
h2.name = "Test 2";
h2.color = MagicColors.RandomColor(h1.color, 0.25f);
for (float t = 0.0f; t < 100.0; t += 1.0f)
{
h1.addPoint(t, 15.0f * (float)(Math.Sin(t / 50.0f)) + 10.0f, t + 200.0f, 500.0f);
h2.addPoint(t, 7.0f * (float)(Math.Cos(t / 20.0f)) - 25.0f, t - 120.0f, 200.0f);
}
histories.Add(h1);
histories.Add(h2);
}
protected override void OnPaint(PaintEventArgs e)
{
for (int j = 0; j < histories.Count; j++)
{
stateHistory h = histories[j];
Pen pen = new Pen(h.color);
List <Point> points = new List <Point>();
int xOffset = 0;
for (int i = 0; i < h.history.Count; i++)
{
statePoint p = h.history[i];
int x = Conversion.Longitude2Pixel(p.longitude, Width) + xOffset;
int y = Conversion.Latitude2Pixel(p.latitude, Height);
points.Add(new Point(x, y));
if (x > Width)
{
// Draw current points, start new set
if (points.Count > 1)
{
e.Graphics.DrawLines(pen, points.ToArray());
}
points.Clear();
xOffset -= Width;
}
if (i != h.history.Count - 1 && p.t < CurrTime && CurrTime <= h.history[i + 1].t)
{
// Draw point for current satellite position
int sx = Conversion.Longitude2Pixel(p.longitude, Width) + xOffset;
int sy = Conversion.Latitude2Pixel(p.latitude, Height);
e.Graphics.DrawEllipse(pen, new Rectangle(sx - satellitePointRadius, sy - satellitePointRadius, 2 * satellitePointRadius, 2 * satellitePointRadius));
}
}
if (points.Count > 1)
{
e.Graphics.DrawLines(pen, points.ToArray());
}
// Draw label
e.Graphics.DrawString(h.name, Font, pen.Brush, new Point(Width - 100, 20 * (j + 1)));
}
// Update
TimeSpan diff = DateTime.Now - lastRender;
float dt = (float)(diff.Seconds) + (float)(diff.Milliseconds) / 1000.0f;
CurrTime = CurrTime + dt * speed;
if (CurrTime == EndTime)
{
// Pause at end
speed = 0;
updateButton();
}
lastRender = DateTime.Now;
timeLabel.Text = CurrTime.ToString();
// Force animation update
if (speed > 0)
{
Invalidate(true);
timeLabel.Invalidate();
slideBar1.Invalidate();
}
base.OnPaint(e);
}