Prawn::Chart::Line

Prawn::Chart::Line plots its values as a Line graph, relatively sized to fit within the space defined by the Prawn::Chart::Grid associated with it.

Call to new will return a new instance of Prawn::Chart::Line ready to be rendered.

Takes an Array of data, which should contain complete rows of data for values to be plotted; a reference to a document which should be an instance of Prawn::Document and an options with at least a value for :at specified.

Options are:

:at , which should be an Array representing the point at which the graph
should be drawn.

:title, the title for this graph, wil be rendered centered to the top of 
the Grid.

:label_x, a label to be shown along the X axis of he graph, rendered centered
on the grid.

:label_y, a label to be shown along the Y axis of he graph, rendered centered
on the grid and rotated to be perpendicular to the axis.

Data should be formatted like:

[
  [ 'Column Heading', SomeValue ],
  [ 'Column Heading', SomeValue ],
  [ 'Column Heading', SomeValue ],
  [ 'Column Heading', SomeValue ],
  [ 'Column Heading', SomeValue ],
  [ 'Column Heading', SomeValue ]
]

[Validate]

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