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POAChartEngine renders null values
 

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    <p>I have a BarChart which has some values which are set to MathHelper.NULL_VALUE so they are not rendered (it is supposed to leave blank positions in the chart). However, the null values are still rendered and look more like 0.0 as shown below.</p> <p><img src="https://i.stack.imgur.com/Oxxu2.png" alt="null values"></p> <p>If I log the values printed I can see that the NULL_VALUEs are present in the series:</p> <pre><code>10-23 09:50:24.206: DEBUG/ConsumptionChartBuilder(27359): x:16.0Y:1.0 10-23 09:50:24.206: DEBUG/ConsumptionChartBuilder(27359): x:17.0Y:3.0 10-23 09:50:24.206: DEBUG/ConsumptionChartBuilder(27359): x:18.0Y:1.7976931348623157E308 10-23 09:50:24.206: DEBUG/ConsumptionChartBuilder(27359): x:19.0Y:1.7976931348623157E308 10-23 09:50:24.216: DEBUG/ConsumptionChartBuilder(27359): x:20.0Y:6.0 10-23 09:50:24.216: DEBUG/ConsumptionChartBuilder(27359): x:21.0Y:1.7976931348623157E308 </code></pre> <p>Setting/Unsetting the min Y value doesn't change anything.</p> <p>I really need to differentiate between 0 and null and leaving points out of the bar chart results in some further odd rendering (the blank spaces are not the correct width)...</p> <p><strong>Does anyone know how to not render null values in an AChartEngine BarChart?</strong> </p> <p>Edit: Some code which reproduces it.</p> <pre><code> XYMultipleSeriesDataset multipleSeriesDataset = new XYMultipleSeriesDataset(); XYMultipleSeriesRenderer multipleSeriesRenderer = new XYMultipleSeriesRenderer(); XYSeriesRenderer renderer= new XYSeriesRenderer(); //set up renderer(s) renderer.setColor(Color.RED); multipleSeriesRenderer = new XYMultipleSeriesRenderer(); multipleSeriesRenderer.setInScroll(true); multipleSeriesRenderer.setPanEnabled(false, false); multipleSeriesRenderer.setZoomEnabled(false, false); multipleSeriesRenderer.setAntialiasing(true); multipleSeriesRenderer.setShowLabels(true); multipleSeriesRenderer.setShowLegend(false); multipleSeriesRenderer.setYLabelsAlign(Paint.Align.LEFT); multipleSeriesRenderer.setApplyBackgroundColor(true); multipleSeriesRenderer.setMargins(new int[]{20, 3, 0, 0}); multipleSeriesRenderer.setMarginsColor(Color.WHITE); multipleSeriesRenderer.addSeriesRenderer(renderer); multipleSeriesRenderer.setXLabelsAlign(Paint.Align.CENTER); //text size final float scale = getResources().getDisplayMetrics().density; multipleSeriesRenderer.setLabelsTextSize((int)(scale*10+0.5f)); multipleSeriesRenderer.setXLabelsColor(Color.BLACK); multipleSeriesRenderer.setYLabelsColor(0,Color.BLACK); multipleSeriesRenderer.setShowAxes(false); multipleSeriesRenderer.setBackgroundColor(Color.TRANSPARENT); //set max and min of axis multipleSeriesRenderer.setYAxisMin(0); multipleSeriesRenderer.setYAxisMax(10); multipleSeriesRenderer.setXAxisMax(7.5); multipleSeriesRenderer.setXAxisMin(0.5); multipleSeriesRenderer.setBarSpacing(0.1); //set up series XYSeries series = new XYSeries("test"); series.add(1, MathHelper.NULL_VALUE); series.add(2, 1); series.add(3, 6); series.add(4, MathHelper.NULL_VALUE); series.add(5, 0); series.add(6, 5); series.add(7, MathHelper.NULL_VALUE); multipleSeriesDataset.addSeries(series); //add x labels to replicate my original code multipleSeriesRenderer.setXLabels(0); multipleSeriesRenderer.addXTextLabel(1, "Mon"); multipleSeriesRenderer.addXTextLabel(2, "Tue"); multipleSeriesRenderer.addXTextLabel(3, "Wed"); multipleSeriesRenderer.addXTextLabel(4, "Thu"); multipleSeriesRenderer.addXTextLabel(5, "Fri"); multipleSeriesRenderer.addXTextLabel(6, "Sat"); multipleSeriesRenderer.addXTextLabel(7, "Sun"); ((LinearLayout)findViewById(R.id.layout_graph)).addView(ChartFactory.getBarChartView(this, multipleSeriesDataset, multipleSeriesRenderer, BarChart.Type.DEFAULT)); </code></pre> <p><strong>Edit number 2: Screenshots of the above code:</strong></p> <p>With null values:</p> <p><img src="https://i.stack.imgur.com/Sqt2g.png" alt="screenshot with null values"></p> <p>If I don't add the null values then the graph looks skewed as shown here where the bars touch one another. </p> <p><img src="https://i.stack.imgur.com/cSYd4.png" alt="screenshot without null values"></p>
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    1. COShow us some code, otherwise we cannot help.
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    2. COfair point, added.
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    3. COPlease note that the code you added displays something while the screenshot shows something else.
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