Sets the gaps of the join line that joins the pyramid layer with the left and right labels.
To apply this method to all pyramid layers, use PyramidChart.setJoinLineGap
By default, the starting point of the join line connects to the pyramid layer edge with a 3 pixels gap. The join line is horizontal, and its length is such that the ending point is 10 pixels outside the pyramid bounding box. The label text box connects to the ending point with a 3 pixels gap.
This method allows the gaps and positions of the join line end points to be configured to other values.
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