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 XYChart - Financial - Left Axis crazy |
| Posted by icm63 on Jun-02-2019 08:10 |
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Stock price data for CLF
Comparing highs and lows of yAxis on the left hand side of XYCHART.
*** Left Axis Line code ***
Dim myLine As LineLayer = DrawLayer.addLineLayer(Close, AdjPriceColor, "Line")
myLine.moveFront()
myLine.setUseYAxis2()
*** Left Axis OHLC code ****
Dim myOHLC As HLOCLayer = DrawLayer.addHLOCLayer(High, Low, Open, Close, AdjPriceColor, AdjPriceColor)
myOHLC.setDataWidth(DWidth)
myOHLC.setLineWidth(LWidth)
myOHLC.setUseYAxis2()
Now compare yAxis low to high range for the exact same dataset, for Line and OHLC layer...
QUESTION : Why is it different? I wish it to be the same. yaxis().AutoScale makes no difference
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| Re: XYChart - Financial - Left Axis crazy |
| Posted by Peter Kwan on Jun-02-2019 18:44 |
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Hi icm63,
By default, ChartDirector will use the default auto scale parameters, which will start the y-axis from 0 unless the data range is small. It is because this is appropriate for most common chart applications.
However, for financial chart styles, it will not have a preference to start the y-axis from 0, because it is traditionally how financial charts are plotted.
A HLOCLayer is treated as a financial style layer, while a line layer is just a generic layer. That's why they have different auto-scale behaviour.
You may use Axis.setAutoScale to configure the auto-scale parameters to override the default. The yAxis().setAutoScale will have no effect in your code, because your code uses the secondary y-axis (yAxis2), not the default y-axis (yAxis). You may try:
DrawLayer.yAxis2().setAutoScale(0.1, 0.1, 0)
Hope this can help.
Regards
Peter Kwan |
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