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Candle or column width is calculated depending on count of data points in viewport.
You can change data point width by creating subclass os SCIFastCandlestickRenderableSeries or SCIFastCollumnRenderableSeries and overriding the following method:
- (float) getDatapointWidthFrom:(id<SCIPointSeries>)pointSeries Amount:(int)barsAmount Calculator:(id<SCICoordinateCalculator>)xCalc WidthFraction:(double)widthFraction
Return value is data point width in pixels.
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