B4J Question How to save the chart to image file?

[positrom2]

The heading is the question...

 

[Erel]

How are you drawing the chart?

 

[positrom2]

I am starting with this (it is a revised version of that available in this forum):
http://www.rwblinn.de/b4j/opensource/roavgsplit.zip
The Layout is made with SceneBuilder, and then:

Sub createlineChart(nTime As Double, nDistance As Int)
' The label is already set using the scene builder - but here to show how to change these
' XAxisJO.RunMethod("setLabel",Array As Object("Time"))
' YAxisJO.RunMethod("setLabel",Array As Object("Km/Hr for " & nDistance))

' Clear the data from the line chart by using remove the series javaobject
' Check if data is available
If LCGetDataJO.IsInitialized Then LCGetDataJO.RunMethod("remove",Array As Object(SeriesJO))

' Check distance and time. if zero then do nothing
If nTime = 0 Then Return
If nDistance = 0 Then Return

' Define the data series and set the name
SeriesJO.InitializeNewInstance("javafx.scene.chart.XYChart.Series",Null)
SeriesJO.RunMethod("setName",Array As Object("Time/Speed for " & nDistance & "m"))

I tried this but it doen't work (file not found error):

Sub saveform
Dim Snapshot As Image
Snapshot.initialize("d:\","1.png")
Dim out As OutputStream=File.OpenOutput("d:\","1.png",False)
Snapshot.WriteToStream(out)
out.Close
End Sub

Thank you in advance.

 

[Erel]

Your code is wrong. You are trying to load an image and then save it back.

I'm not familiar with this library. However all nodes have a Snapshot method that returns an image from the node (assuming that the library was built correctly).

For example to save a TableView:

Dim out As OutputStream = File.OpenOutput(...)
TableView1.Snapshot.WriteToStream(out)
out.Close

 

[positrom2]

That was a close hit...
This does it:

Sub savechart
Dim out As OutputStream = File.OpenOutput("d:\","2.png",False)
LineChartXY.Snapshot.WriteToStream(out)
out.Close
End Sub

Thank you.