draw point chart from latitude and longitude

[Lan Mo]

Hi There,

For chartcontrol, do you have any build-in functions or properties to draw a point chart from a series of GPS latitude and longitude coordinates?

for example, if I collected 1000 GPS points along a highway at interval of about 5 meters, each point has its latitude and longitude coordinates. I want to convert latitude to distance in meters, then draw it as Y-axes, convert longitude to distance in meters, then draw it on X-axes. so that the chart displays a curve of the 5-kilometers road.

Do you have any idea or examples?

Thanks,

Lan

[Manimala S]

Hi Lan,

Currently we don have a built function or property to do this. But you can get the various values of longitude and latitudes in an array or a set of variables and convert those to meter values and then just plot the chart (with 5 meters interval) of the converted points as we add series points to the chart.


Kindly, let me know if you are able to do this.

Thanks,
Manimala

[Lan Mo]

Hi Manimala,

Thanks you for you help.

I used following code to draw points chart. I want to show the point as red-circle with size(1,1). But the point always diaplay as black-circle. see my attached screen-shot.

I want to know what's wrong with my code.

Is the chart type correct for point chart ?
series.Type = ChartSeriesType.Scatter;

Thanks you very much.


private void InitializeCurveData(decimal from, decimal to )
{

// Hide the chart object to speed up drawing process.
chtModel.BeginUpdate();
chtModel.Series.Clear();

//set type
ChartSeries series=chtModel.Model.NewSeries("GPSCurve");
chtModel.Series.Add(series);

//I want to display point as a red circle
series.Type = ChartSeriesType.Scatter;
System.Drawing.Color pIndexColor = new Color();
pIndexColor=Color.Red;
series.Style.Interior =
new Syncfusion.Drawing.BrushInfo(Syncfusion.Drawing.GradientStyle.None,
pIndexColor, pIndexColor);
series.Style.Border.Color = pIndexColor;
series.Style.Symbol.Shape = ChartSymbolShape.Circle;
series.Style.Symbol.Size=new Size(1,1);
series.Style.Symbol.Color =pIndexColor;

//add points
DataTable dtGPS=BL.Access.LoadDataTable("working_cl","ppgps_order,PP_CL_NORTHING,PP_CL_EASTING",
string.Format("ppgps_order>={0} and ppgps_order<={1}",from,to));
DataRow[] rows=dtGPS.Select("","ppgps_order asc");
double MIN_EASTING=double.MaxValue;
double MIN_NORTHING=double.MaxValue;
double MAX_EASTING=double.MinValue;
double MAX_NORTHING=double.MinValue;
for(int i = 0; i < rows.Length; i++)
{
DataRow row=rows[i];
if ((row["PP_CL_NORTHING"]==DBNull.Value) || (row["PP_CL_EASTING"]==DBNull.Value)) continue;

double PP_CL_NORTHING=Convert.ToDouble(row["PP_CL_NORTHING"]);
double PP_CL_EASTING=Convert.ToDouble(row["PP_CL_EASTING"]);
series.Points.Add(PP_CL_EASTING,PP_CL_NORTHING);

//min
if (PP_CL_NORTHING if (PP_CL_EASTING if (PP_CL_NORTHING>MAX_NORTHING) MAX_NORTHING=PP_CL_NORTHING;
if (PP_CL_EASTING>MAX_EASTING) MAX_EASTING=PP_CL_EASTING;


}




//customize X-axes Y-axes
double SCALE=Math.Max(MAX_NORTHING-MIN_NORTHING,MAX_EASTING-MIN_EASTING);
double INTERVAL=SCALE/10;
//adjust MIN to make the scurve in middle
if (MAX_NORTHING-MIN_NORTHING>MAX_EASTING-MIN_EASTING)
{
MIN_EASTING=MIN_EASTING-(MIN_EASTING+SCALE-MAX_EASTING)/2;
}
else
{
MIN_NORTHING=MIN_NORTHING-(MIN_NORTHING+SCALE-MAX_NORTHING)/2;
}
chtModel.PrimaryXAxis.Title = "Easting";
chtModel.PrimaryYAxis.Title="Northing";
chtModel.LegendPosition=ChartDock.Right;
chtModel.PrimaryYAxis.RangeType = ChartAxisRangeType.Set;
chtModel.PrimaryYAxis.Range.Min = MIN_NORTHING-INTERVAL/2;
chtModel.PrimaryYAxis.Range.Max = MIN_NORTHING+SCALE+INTERVAL/2;//MAX_NORTHING;
chtModel.PrimaryYAxis.Range.Interval =INTERVAL;
chtModel.PrimaryXAxis.RangeType = ChartAxisRangeType.Set;
chtModel.PrimaryXAxis.Range.Min =MIN_EASTING-INTERVAL/2;
chtModel.PrimaryXAxis.Range.Max =MIN_EASTING+SCALE+INTERVAL/2;//MAX_EASTING;
chtModel.PrimaryXAxis.Range.Interval = INTERVAL;
chtModel.PrimaryXAxis.LabelRotate = true;
chtModel.PrimaryXAxis.LabelRotateAngle = 315;

// Now show the chart.
chtModel.EndUpdate();

}






PointChart_d96a8cce.zip

[Manimala S]

Hi Lan,

You can get this by setting the border color of the symbol. Here is the code to do this.

series.Style.Symbol.Border.Color = pIndexColor;

Kindly, let me know if it helps.

Thanks,
Manimala.

[Lan Mo]

Hi,
Sorry. I am using V4.4.0.51.
There is no such "series.Style.Symbol.Border.Color "property in that version.

I try to make my question clearer here.
In Syncfusion 4.4.0.51 and C#, I want to draw a set of (x,y) data as POINTS OF CIRCLE WITH RED COLOR.

How can I do it? if you can give me a sample, that would be super.

Thank you very much for helping.

Lan

[Manimala S]

Hi Lan,

I am working on this, will update you once I have got.

Thanks,
Manimala.