Chapter 9

plot.ss: Plot

To load: (require (lib "plot.ss" "mrlib"))

The plot.ss library provides a simple tool for plotting data values to a device context.

Two structures are provided: data-set and plot-setup.

A data-set value includes the following fields (which should be supplied on order to make-data-set):

• points : (listof (is-a?/c point%)) -- the data values to plot.

• connected? : any? -- indicates whether the points are connected by a line.

• pen : (is-a?/c pen%) -- the drawing pen for plotting points/lines.

• min-x : number?, max-x : number?, min-y : number?, and max-y : number? -- the to plot the points, in drawing-context coordinates.

A plot-setup value includes the following fields (which should be supplied on order to plot-setup):

• axis-label-font : (is-a?/c font%) -- the font for drawing axis labels.

• axis-number-font : (is-a?/c font%) -- the font for drawing axis numbers.

• axis-pen : (is-a?/c pen%) -- the pen for drawing the axes.

• grid? : any? -- whether to draw a grid at axis markings.

• grid-pen : (is-a?/c pen%) the pen for drawing the grid (if any).

• x-axis-marking : (listof number?) -- locations for marks on the x-axis.

• y-axis-marking : (listof number?) -- locations for marks on the y-axis.

• x-axis-label : string? -- the x-axis label.

• y-axis-label : string? -- the y-axis label.

(plot dc data-set-list plot-setup)      PROCEDURE

Draws the data-sets in data-set-list into the given dc. Uses drawing-context coordinates in data-sets that will accommodate all of the data sets.