added parameters for styling line cap and join

[ennerf]

See #527 (comment) for discussion.

The defaults for

public class Demo extends Application {
	@Override
	public void start(Stage primaryStage) throws Exception {
		XYChart chart = new XYChart();
		DefaultDataSet dataSet = new DefaultDataSet("miter demo",
				new double[]{1, 2, 3},
				new double[]{1, 2, 1},
				3,
				false);
		dataSet.setStyle("-fx-line-width: 6"); // make it more obvious

		BasicDataSetRenderer renderer = new BasicDataSetRenderer(dataSet);
		chart.getRenderers().setAll(renderer);

		chart.getXAxis().setAutoRanging(false);
		chart.getXAxis().setMin(0);
		chart.getXAxis().setMax(100);

		chart.getYAxis().setAutoRanging(false);
		chart.getYAxis().setMin(0);
		chart.getYAxis().setMax(10);

		primaryStage.setScene(new Scene(chart));
		primaryStage.show();
	}
}

now render as

[sonarcloud]

SonarCloud Quality Gate failed.   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
19 Code Smells

No Coverage information
0.0% Duplication

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[codecov]

Codecov Report

Attention: 17 lines in your changes are missing coverage. Please review.

Comparison is base (380940a) 48.08% compared to head (ab9c2dd) 48.10%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #626      +/-   ##
============================================
+ Coverage     48.08%   48.10%   +0.02%     
- Complexity     6212     6219       +7     
============================================
  Files           374      374              
  Lines         38288    38285       -3     
  Branches       6105     6105              
============================================
+ Hits          18409    18417       +8     
+ Misses        18729    18721       -8     
+ Partials       1150     1147       -3     

Files	Coverage Δ
...acc/chartfx/renderer/spi/ErrorDataSetRenderer.java	59.17% <100.00%> (-0.96%)	⬇️
...acc/chartfx/renderer/spi/ReducingLineRenderer.java	0.00% <0.00%> (ø)
...acc/chartfx/renderer/spi/BasicDataSetRenderer.java	0.00% <0.00%> (ø)
...ir_acc/chartfx/renderer/spi/HistogramRenderer.java	0.00% <0.00%> (ø)
.../fair_acc/chartfx/ui/css/DataSetNodeParameter.java	52.31% <59.09%> (+1.15%)	⬆️

... and 4 files with indirect coverage changes

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[wirew0rm]

Looks good and I cannot see any regressions with the samples. Thanks for following it up.