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3
Votes

Dynamic Trackball measurements

Some chart applications require dynamic measurements related to two points on a line chart. The current library can accomplish this using the tool tip to place a marker on the chart using the 

shouldAlwaysShow 
 attribute and the trackball can then be used to dynamically show information related to the tool tip point and the current trackball position. If the trackball is set to shouldAlwaysShow, when the trackball is released, the trackball marker continues to be displayed, but the tool tip is removed. It would be more useful if the tool tip would remain until a new tool tip gesture is received and a new tool tip is rendered.