B4A Library GraphView Library (Source Code Added)

Michael Gasperi

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I too make good use of this library. However, seems that I only find the 1.0 version for download at the top of this thread. I thought I looked in all the places where library files are usually kept, but XYGraph doesn't seem to be there. Where does it live or am I blind and don't see it?
 

walterf25

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You can download it from here, it is in the first post.
 

walterf25

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The library has been updated, you can now add 3 different series to the graph, the live graph view also supports 3 different series, i've also updated the example and have commented the code so you can follow it. I will try to update the library again and implement as many series as you want within the capability of the original library. I'll do that as soon as i get some time.

Enjoy!
 

wimpie3

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Thanks, great news!

Will you add
- setCustomLabelFormatter
- drawBackground
- setDrawDataPoints

as well please? This is something I've been waiting for a long time...
 

walterf25

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Thanks, great news!

Will you add
- setCustomLabelFormatter
- drawBackground
- setDrawDataPoints

as well please? This is something I've been waiting for a long time...
I'll try to add those methods as soon as i get some free time.
 

ValDog

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I've been working with your example code, specifically the SimpleGraph example, trying to display the graph in a Panel. The graph displays just fine, but the associated x and y axis value labels do not show. Has anyone been able to do this?
 

walterf25

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I've been working with your example code, specifically the SimpleGraph example, trying to display the graph in a Panel. The graph displays just fine, but the associated x and y axis value labels do not show. Has anyone been able to do this?
Can you post your project?
 

ValDog

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Here it is...

Could not upload the entire file - too large?? So, here is the pertinent code applied to your example SimpleGraph.bas:

Sub Globals
Dim simpleseries As graphseries
Dim simplegraph As graphview
Dim XYGraph As XYGraph
Dim y(100) As Double
Dim sinewave As Double
Dim view1 As View

Private pnlGraphing As Panel
End Sub

Sub Activity_Create(FirstTime As Boolean)
Activity.LoadLayout("graphing")

For i = 0 To y.Length -1
sinewave = sinewave + 0.2
y(i) = Sin(sinewave)
Next

simpleseries.Initialize("SimpleSeries", Colors.Cyan, y, 3)
simplegraph.Initialize("line", simpleseries)
view1 = XYGraph.PlotSingleLine("Simple Graph Example", simplegraph, simpleseries)
XYGraph.Legend(simplegraph, True)
XYGraph.setScalable(simplegraph, True)
XYGraph.setViewPort(simplegraph, 1, 49)
XYGraph.setScrollabe(simplegraph, True)
XYGraph.setLegendWidth(simplegraph, 300)
XYGraph.setTextSize(simplegraph,20)

' Activity.AddView(view1, 0, 0, 90%x, 90%y)
pnlGraphing.AddView(view1, 50, 90, pnlGraphing.Width * .75, pnlGraphing.Height * .75)

End Sub


Note that I added a panel in a new activity, "graphing", named pnlGraphing - and modified Manifest to display this new activity in "portrait" mode.
 

walterf25

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I don't see the problem you are saying, i just tried it again this time by adding the graph to a panel and it works just fine, see the image attached.

https://www.dropbox.com/s/ipr3vhuy06rahkx/graph_screenshot.png

Cheers,
Walter
 

ValDog

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Has anyone noticed that this library does not play nice with Debug (rapid)? Even a trivial change to code, say adding a blank line line in the code, results in a crash with a message like:

** Activity (main) Pause, UserClosed = false **
** Activity (specview) Create, isFirst = false **

Error occurred on line: 39 (specview)
java.lang.RuntimeException: Object should first be initialized (graphview).
at anywheresoftware.b4a.AbsObjectWrapper.getObject(AbsObjectWrapper.java:46)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:636)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:302)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:238)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:121)
at b4a.gsight.specview.afterFirstLayout(specview.java:98)
at b4a.gsight.specview.access$100(specview.java:16)
at b4a.gsight.specview$WaitForLayout.run(specview.java:76)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)


The subject code line (39) reads:

view1 = XYGrapha.PlotSingleLine("Spectrum", simplegraphview, specseries)

And of course the line just above (38) has already initialized "simplegraphview":

simplegraphview.Initialize("line", specseries)



Under Debug (legacy) it seems to work just fine. Anyone else experiencing this or is it just me?
 

walterf25

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As far as i Know, a lot of the custom made libraries don't work well with the rapid debugger.
 

ValDog

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Attachments

  • XYGraph ExampleVM.zip
    8.3 KB · Views: 349

walterf25

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Walter, this is strange - I figured out why my code download was too big - see my uploaded code and try it again - thanks!
Hi the problem is that you are setting the color of your panel to white, and the color of the x and y text is also white, so you can't see the text obviously.

You can either change the color of the panel to black or some other color, or you can change the color of the x and y labels

B4X:
    XYGraph.setHorizontalLabelColor(simplegraph, Colors.Black)
    XYGraph.setVerticalLabelColor(simplegraph, Colors.Black)
 

ValDog

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Walter, do you have any ideas on just how one would create a display with a logarithmic y scale using this library?

Secondly, the display x axis values are just a reflection of the number of y data points. In fact they can also represent other values, for instance in my application I display the number of counts collected in each of 510 energy bins. Now, those energy bins correlate to energy values - so ideally I would like to be able to display an x axis value that equals the bin number multiplied by some factor. Any thoughts?
 

ValDog

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Walter, got another one for you...

This is from your MultipleLineGraph example code:

Sub Globals
Dim series1, series2 As graphseries
Dim multiplegraphview As graphview
Dim xymultiplegraph As XYGraph
Dim data1(100) As Double
Dim data2(100) As Double
Dim sinewave As Double
Dim cosinewave As Double
Dim view1 As View
End Sub

Sub Activity_Create(FirstTime As Boolean)
For i = 0 To data1.Length - 1
sinewave = sinewave + 0.2
data1(i) = Sin(sinewave)
Next

For i = 0 To data2.Length - 1
cosinewave = cosinewave + 0.2
data2(i) = Cos(cosinewave)
Next

series1.Initialize("Sine Curve Series", Colors.Red, data1, 3)
series2.Initialize("Cosine Curve Series", Colors.Blue, data2, 3)
multiplegraphview.InitializeMultipleGraph("line", series1, series2, Null)

view1 = xymultiplegraph.PlotMultipleLines("Multiple Line Graph", multiplegraphview, series1, series2, Null)

xymultiplegraph.setScrollabe(multiplegraphview, True)
xymultiplegraph.setViewPort(multiplegraphview, 1, 99)
xymultiplegraph.Legend(multiplegraphview, True)
xymultiplegraph.setLegendAlign(multiplegraphview, "bottom")
xymultiplegraph.setLegendWidth(multiplegraphview, 300)

Activity.AddView(view1, 0, 0, 100%x, 100%y)
End Sub


When I Test Compilation I get no errors, but when I run it I crash on the "view1 = xymultiplegraph...." statement above with a NullPointerException. ??
 

walterf25

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Hi, i just checked and yes it looks like a bug, i don't check for any exception in my library in case you only want to use 2 series, what you can do for the meantime is set the data for series3 to 0 and also set the color of series3 to colors.transparent, that way it will not show up in your graph.

I will try to fix this as soon as i get a chance.

Thanks,
Walter
 
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