NewPainter constructs a new Line painter with the passed options and fills in defaults for missing fields.

Default fill color.

DefaultHeight of a canvas is 200px.

Default interpolation mode.

Default horizontal spread of data points.

Default stroke color.

Default stroke width.

InterpolationEmpty is for catching uninitialized interpolation modes.

InterpolationFritschCarlson applies the Fritsch-Carlson method for interpolating hermitic cubic splines to fit the data points See: http://math.stackexchange.com/questions/45218/implementation-of-monotone-cubic-interpolation.

InterpolationNone means no interpolated points and a piecewise linear curve as the result.

InterpolationSteffen applies the Steffen method for interpolating hermetic cubic splices to fit the data points.