SciChart® the market leader in Fast WPF Charts, WPF 3D Charts, and now iOS Charting & Android Chart Components
We also have a tag=SciChart on Stackoverflow.com where you can earn rep for your questions!
Hello again! 🙂
This time I am trying to draw marker for a maximum numeric data value in chart with CategoryDateTime X axis.
I have my X axis defined like this:
id<SCIAxis2D> xAxis = [[SCICategoryDateTimeAxis alloc] init];
and I am trying to draw a marker in draw() method of a custom modifier using this code:
id<SCIRenderPassData> data = [_rSeries currentRenderPassData]; id<SCICoordinateCalculator> xCalc = [data xCoordinateCalculator]; id<SCICoordinateCalculator> yCalc = [data yCoordinateCalculator]; NSLog(@"Is category calc: %d", [xCalc isCategoryAxisCalculator]); double xCoord = [xCalc getCoordinateFromDate:_xValue]; double yCoord = [yCalc getCoordinateFrom:_yValue]; [_marker drawToContext:context AtX:xCoord Y:yCoord];
My _xValue is computed and set from outside and is for sure is a valid date on X axis for which I need to draw the marker on.
My problem is that:
My questions are:
Looking forward to your always useful reply. 🙂
I managed to solve the problem by manually finding the index of the NSDate* I need to plot the marker on, injecting it as _xValue into derived modifier class and then doing this CoordinateCalculator accrobatics:
id<SCICoordinateCalculator> xCalc = [[parent.xAxes getAxisById:@"xAxis"] getCurrentCoordinateCalculator];
where parent is my SCIRenderSurface.
Can’t we do this without dependency on parent render surface?
Please login first to submit.