/// <summary>
/// This is the rendering loop, called periodically to update the graph.
/// </summary>
private void timer_Tick(object sender, EventArgs e)
{
var info = GetInfo(Key);
if (info == null)
{
return;
}
// Find new maximum values on x and y axes.
float maxX, maxY;
Rescale(info, out maxX, out maxY);
if (maxY == 0.0)
{
return;
}
// Start scaling animation if necessary.
_xAxisAnimation.SetTarget(info.GraphPane.XAxis.Scale.Max, maxX, STEPS_FOR_TIME_AXIS_ANIMATION);
_yAxisAnimation.SetTarget(info.GraphPane.YAxis.Scale.Max, maxY * 1.1, STEPS_FOR_INTENSITY_ANIMATION);
// Tell Zedgraph if axes are being changed.
double nextTime = info.CurrentTime ?? 0;
double millisElapsed = (DateTime.UtcNow - _lastRender).TotalMilliseconds;
if (_xAxisAnimation.IsActive || _yAxisAnimation.IsActive)
{
info.GraphPane.XAxis.Scale.Max = _xAxisAnimation.Step();
info.GraphPane.YAxis.Scale.Max = _yAxisAnimation.Step();
info.GraphPane.AxisChange();
StartRender();
}
else if (millisElapsed < MIN_INCREMENTAL_RENDER)
{
return;
}
else
{
double minTime = Math.Min(_renderMin, _lastTime);
double maxTime = Math.Max(_renderMax, nextTime);
// Limit the number of steps for advancing progress
if (millisElapsed < MAX_INCREMENTAL_RENDER && maxTime - minTime <= info.GraphPane.XAxis.Scale.Max / INCREMENTS_PER_PASS)
{
return;
}
IncrementalRender(info, minTime, maxTime);
_lastRender = DateTime.UtcNow;
}
_lastTime = nextTime;
_renderMin = double.MaxValue;
_renderMax = double.MinValue;
}
