toPercentYCoord method
Converts a y for an axis to a percentage from the top to the bottom of the drawing area.
If the coordinate represents a value visible on the canvas, then the value will be between 0 and 1, where 0 is the top of the canvas. However, this method will return values outside the range, as values can fall outside the canvas.
If y is null
, this returns null
.
if axis is null
, this uses the first axis.
Implementation
external num toPercentYCoord([num? y, num? axis]);