I am wondering if there is any (Win8 Metro-styled) WinRT/XAML component that can be used to determine data from a drawing in a prefilled chart.
The control should initially display a chart but the user should be able to draw a new line, bar etc. in it or to continue the existing series. This drawing should then be used to gather the underlying data points.
I guess one could lay a canvas over a chart and use this to draw but then it’s rather complicated to apply the axis values of the charts afterwards.
There are no chart controls available in WinRT. You can draw something using any APIs you choose – Rectangles, Image+WriteableBitmap etc. and handle pointer events to draw or adjust your data points.