getBarChartView in 1.1.0 will not display negative values, getBarChartView in 1.2.0 crashes on Pan

paragp / achartengine

AChartEngine is a charting library for Android applications. It currently supports the following chart types: line chart area chart scatter chart time chart bar chart pie chart bubble chart doughnut chart range (high-low) bar chart dial chart / gauge combined (any combination of line, cubic line, scatter, bar, range bar, bubble) chart cubic line chart All the above supported chart types can contain multiple series, can be displayed with the X axis horizontally (default) or vertically and support many other custom features. The charts can be built as a view that can be added to a view group or as an intent, such as it can be used to start an activity. The model and the graphing code is well optimized such as it can handle and display huge number of values. AChartEngine is currently at the 1.0.0 release. New chart types will be added in the following releases. Please keep sending your feedback such as we can continually improve this library. Find us on Facebook, too: http://www.facebook.com/achartengine Read a short introduction to AChartEngine here: http://www.javaadvent.com/2012/12/achartengine-charting-library-for.html Another good tutorial can be read here: http://jaxenter.com/effort-free-graphs-on-android-with-achartengine-46199.html

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What steps will reproduce the problem?
1. Reading on the web, both of these are known and corrected, just not in the 
same version
2.
3.

What is the expected output? What do you see instead?

When using getBarChartView in 1.1.0, it would not display bars below zero (Bars 
with a Negative Y Value).  The recommendation was to use 1.2.0.   It worked.  
But, in 1.20 I get:
10-02 01:14:58.133: E/AndroidRuntime(1537): FATAL EXCEPTION: main
10-02 01:14:58.133: E/AndroidRuntime(1537): java.lang.NullPointerException
10-02 01:14:58.133: E/AndroidRuntime(1537):     at 
org.achartengine.chart.XYChart.toRealPoint(XYChart.java:877)
10-02 01:14:58.133: E/AndroidRuntime(1537):     at 
org.achartengine.tools.Pan.apply(Pan.java:74)
10-02 01:14:58.133: E/AndroidRuntime(1537):     at 
org.achartengine.TouchHandler.handleTouch(TouchHandler.java:119)
10-02 01:14:58.133: E/AndroidRuntime(1537):     at 
org.achartengine.GraphicalView.onTouchEvent(GraphicalView.java:300)
10-02 01:14:58.133: E/AndroidRuntime(1537):     at 
android.view.View.dispatchTouchEvent(View.java:7384)

I get this whenever I press on the chart to pan it.  On the web, I see that you 
have fixed this issue in 1.1.0.  I tried with 1.1.0 and there was no crash, but 
no Bars below zero either.

Anyway to get a .jar that has both of these fixed?

Please provide a source code snippet that we can use to replicate the issue.

What version of the product binary library are you using?
Both, as described above

Please provide any additional information below.

Original issue reported on code.google.com by sb...@aim.com on 2 Oct 2013 at 3:32

I am getting this problem right now with version 1.2.0. I am using ChartFactory.getCombinedXYChartIntent with two Y axes, 2 bars, 2 lines and 1 scatter series. Every time I touch the screen the exception is fired. Important observation, if I zoom down the image and turn back, the problem does not happen.

paragp / achartengine

getBarChartView in 1.1.0 will not display negative values, getBarChartView in 1.2.0 crashes on Pan #359