Class Prawn::Chart::Bar
In: lib/prawn/graph/bar.rb
Parent: Base

Prawn::Chart::Bar plots its values as a Bar 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::Bar 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]