protected int graphValue(GraphItem ev, int index)
{
// the Server Availability graph requires interpolated (stepped) line;
// others require peaks where the data actually is:
if(ev == null)
{ // no data at this point.
switch(m_graphMode)
{
case GRAPH_MODE_STEPPED:
ev = m_lastItem; // may be null too
break;
}
}
int value;
if(ev == null || (index+1) > ev.nValues())
{
value = m_yZeroMark;
}
else
{
double evValue = ev.values(m_format)[index];
if(m_format == Project.FORMAT_EARTHQUAKES_STRONGEST && evValue == 0.0d)
{
evValue = 0.5d; // quakes with unknown magnitude will be small bumps on the graph
}
value = m_yZeroMark - (int)(evValue * m_valueFactor);
}
m_lastItem = ev;
return value;
}
private void rebuildGraph()
{
if(m_track == null)
{
m_allItems = null;
m_graphItems = null;
this.Invalidate();
return;
}
Cursor.Current = Cursors.WaitCursor;
m_elevMax = -100000.0d; // feet
m_elevMin = 100000.0d;
m_speedMax = -1000.0d;
SortedList graphItems = new SortedList();
Waypoint prevWpt = null;
double odometer = 0.0d; // meters
for(int i=0; i < m_track.Trackpoints.Count ;i++)
{
Waypoint wpt = (Waypoint)m_track.Trackpoints.GetByIndex(i);
Speed speed = null;
Distance leg = null;
double dSpeedCurrentUnits = 0.0d;
if(prevWpt != null)
{
// compute odometer and speed:
TimeSpan dt = wpt.DateTime - prevWpt.DateTime;
leg = wpt.Location.distanceFrom(prevWpt.Location); // meters
double legMeters = leg.Meters;
odometer += legMeters;
double legMetersPerHour = legMeters * 36000000000.0d / dt.Ticks; // meters per hour
if(!m_track.isRoute && legMetersPerHour > 1000.0d && legMetersPerHour < 330.0d * 3600.0d) // sanity check - speed of sound, m/hr
{
speed = new Speed(legMetersPerHour);
dSpeedCurrentUnits = speed.ToDouble();
}
}
odometer = (float)odometer;
long id = (long)i;
double elevCurrentUnits = new Distance(wpt.Location.Elev).ToDoubleCompl();
string properties = wpt.toTableString();
m_elevMax = Math.Max(elevCurrentUnits, m_elevMax);
m_elevMin = Math.Min(elevCurrentUnits, m_elevMin);
m_speedMax = Math.Max(dSpeedCurrentUnits, m_speedMax);
long[] ids = new long[2];
ids[0] = id;
ids[1] = id;
double[] values = new double[2];
values[0] = elevCurrentUnits;
values[1] = dSpeedCurrentUnits;
string[] sValues = new string[2];
sValues[0] = properties;
sValues[1] = "";
GraphItem ev = new GraphItem(odometer, wpt, values, sValues, ids, 2);
while(true)
{
try
{
graphItems.Add(odometer, ev);
break;
}
catch
{
odometer += 0.01d;
}
}
prevWpt = wpt;
}
if(m_elevMax > 0.0d && m_speedMax > 0.0d)
{
// make speed graph match the elevation:
double speedFactor = 0.6d * m_elevMax / m_speedMax;
foreach(GraphItem ev in graphItems.Values)
{
double[] values = ev.values(Project.FORMAT_TRACK_ELEVATION);
values[1] = Math.Round(values[1] * speedFactor);
}
}
string selHint = "Click into grey area to see selected interval";
StringById dZoomById = new StringById(zoomById);
StringById dDescrById = new StringById(descrById);
double rounder = 200.0d;
if(this.m_elevMax > 10000.0d)
{
rounder = 2000.0d;
}
else if(this.m_elevMax > 1000.0d)
{
rounder = 1000.0d;
}
else if(this.m_elevMax <= 50.0d)
{
this.m_elevMax = 50.0d;
rounder = 100.0d;
}
double graphGridMaxValue = Math.Ceiling(this.m_elevMax / rounder) * rounder;
int steps = (int) (graphGridMaxValue / rounder);
this.MaxValueY = graphGridMaxValue;
this.MinKeyDblMargin = 100.0d;
this.StepY = graphGridMaxValue / steps;
this.MarginLeft = 45;
this.MarginRight = 30;
this.initialHint = "Click on graph to see details. Use arrow keys. Drag mouse to select a "
+ (m_track.isRoute ? "route" : "track") + " segment, click into it to zoom.";
this.init(this.enableDisable, "", "", selHint, dDescrById, dZoomById, dBrowseById, new MethodInvoker(showSelected));
this.setGraphData(graphItems, Project.FORMAT_TRACK_ELEVATION, 2, false);
this.SelectItemByObject(m_trkpt);
this.resetLegends();
this.setLegend(0, "elevation");
this.setLegend(1, "speed");
this.Invalidate();
Cursor.Current = Cursors.Default;
}