12 Compatibility Module

6.8

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12 Compatibility Module

Alexander Friedman,
Jamie Raymond,
and Neil Toronto

package: plot-compat

This module provides an interface compatible with Plot 5.1.3 and earlier.

Do not use this module in new programs. It is likely to disappear in a near future release.

Do not try to use both plot and plot/compat in the same program. The new features in Plot 5.2 and later require the objects plotted in plot have to be a different data type than the objects plotted in plot/compat. They do not coexist easily, and trying to make them do so will result in errors.

12.1 Plotting

procedure
(plot data
[ #:width width
#:height height
#:x-min x-min
#:x-max x-max
#:y-min y-min
#:y-max y-max
#:x-label x-label
#:y-label y-label
#:title title
#:fgcolor fgcolor
#:bgcolor bgcolor
#:lncolor lncolor
#:out-file out-file]) → (is-a?/c image-snip%)
  data : (-> (is-a?/c 2d-plot-area%) void?)
  width : real? = 400
  height : real? = 400
  x-min : real? = -5
  x-max : real? = 5
  y-min : real? = -5
  y-max : real? = 5
  x-label : string? = "X axis"
  y-label : string? = "Y axis"
  title : string? = ""
  fgcolor : (list/c byte? byte? byte?) = '(0 0 0)
  bgcolor : (list/c byte? byte? byte?) = '(255 255 255)
  lncolor : (list/c byte? byte? byte?) = '(255 0 0)
  out-file : (or/c path-string? output-port? #f) = #f

Plots data in 2D, where data is generated by functions like points or line.

A data value is represented as a procedure that takes a 2d-plot-area% instance and adds plot information to it.

The result is an image-snip% for the plot. If an #:out-file path or port is provided, the plot is also written as a PNG image to the given path or port.

The #:lncolor keyword argument is accepted for backward compatibility, but does nothing.

procedure
(plot3d data
[ #:width width
#:height height
#:x-min x-min
#:x-max x-max
#:y-min y-min
#:y-max y-max
#:z-min z-min
#:z-max z-max
#:alt alt
#:az az
#:x-label x-label
#:y-label y-label
#:z-label z-label
#:title title
#:fgcolor fgcolor
#:bgcolor bgcolor
#:lncolor lncolor
#:out-file out-file]) → (is-a?/c image-snip%)
  data : (-> (is-a?/c 3d-plot-area%) void?)
  width : real? = 400
  height : real? = 400
  x-min : real? = -5
  x-max : real? = 5
  y-min : real? = -5
  y-max : real? = 5
  z-min : real? = -5
  z-max : real? = 5
  alt : real? = 30
  az : real? = 45
  x-label : string? = "X axis"
  y-label : string? = "Y axis"
  z-label : string? = "Z axis"
  title : string? = ""
  fgcolor : (list/c byte? byte? byte?) = '(0 0 0)
  bgcolor : (list/c byte? byte? byte?) = '(255 255 255)
  lncolor : (list/c byte? byte? byte?) = '(255 0 0)
  out-file : (or/c path-string? output-port? #f) = #f

Plots data in 3D, where data is generated by a function like surface. The arguments alt and az set the viewing altitude (in degrees) and the azimuth (also in degrees), respectively.

A 3D data value is represented as a procedure that takes a 3d-plot-area% instance and adds plot information to it.

The #:lncolor keyword argument is accepted for backward compatibility, but does nothing.

procedure
(points vecs [#:sym sym #:color color])
→ (-> (is-a?/c 2d-plot-area%) void?)
  vecs : (listof (vectorof real?))
  sym : (or/c char? string? exact-integer? symbol?) = 'square
  color : plot-color? = 'black

Creates 2D plot data (to be provided to plot) given a list of points specifying locations. The sym argument determines the appearance of the points. It can be a symbol, an ASCII character, or a small integer (between -1 and 127). The following symbols are known: 'pixel, 'dot, 'plus, 'asterisk, 'circle, 'times, 'square, 'triangle, 'oplus, 'odot, 'diamond, '5star, '6star, 'fullsquare, 'bullet, 'full5star, 'circle1, 'circle2, 'circle3, 'circle4, 'circle5, 'circle6, 'circle7, 'circle8, 'leftarrow, 'rightarrow, 'uparrow, 'downarrow.

procedure
(line f
[ #:samples samples
#:width width
#:color color
#:mode mode
#:mapping mapping
#:t-min t-min
#:t-max t-max]) → (-> (is-a?/c 2d-plot-area%) void?)
  f : (-> real? (or/c real? (vector/c real? real?)))
  samples : (and/c exact-integer? (>=/c 2)) = 150
  width : (>=/c 0) = 1
  color : plot-color/c = 'red
  mode : (one-of/c 'standard 'parametric) = 'standard
  mapping : (one-of/c 'cartesian 'polar) = 'cartesian
  t-min : real? = -5
  t-max : real? = 5

Creates 2D plot data to draw a line.

The line is specified in either functional, i.e. y = f(x), or parametric, i.e. x,y = f(t), mode. If the function is parametric, the mode argument must be set to 'parametric. The t-min and t-max arguments set the parameter when in parametric mode.

procedure
(error-bars vecs [#:color color])
→ (-> (is-a?/c 2d-plot-area%) void?)
vecs : (listof (vector/c real? real? real?))
color : plot-color? = 'black

Creates 2D plot data for error bars given a list of vectors. Each vector specifies the center of the error bar (x,y) as the first two elements and its magnitude as the third.

procedure
(vector-field f
[ #:samples samples
#:width width
#:color color
#:style style])
→ (-> (is-a?/c 2d-plot-area%) void?)
  f : (-> (vector/c real? real?) (vector/c real? real?))
  samples : (and/c exact-integer? (>=/c 2)) = 20
  width : exact-positive-integer? = 1
  color : plot-color? = 'red
  style : (one-of/c 'scaled 'normalized 'real) = 'scaled

Creates 2D plot data to draw a vector-field from a vector-valued function.

procedure
(contour f
[ #:samples samples
#:width width
#:color color
#:levels levels])
→ (-> (is-a?/c 2d-plot-area%) void?)
  f : (-> real? real? real?)
  samples : exact-nonnegative-integer? = 50
  width : (>=/c 0) = 1
  color : plot-color/c = 'black
   levels : (or/c (and/c exact-integer? (>=/c 2)) (listof real?))
= 10

Creates 2D plot data to draw contour lines, rendering a 3D function a 2D graph cotours (respectively) to represent the value of the function at that position.

procedure
(shade f [#:samples samples #:levels levels])
→ (-> (is-a?/c 2d-plot-area%) void?)
  f : (-> real? real? real?)
  samples : (and/c exact-integer? (>=/c 2)) = 50
   levels : (or/c (and/c exact-integer? (>=/c 2)) (listof real?))
= 10

Creates 2D plot data to draw like contour, except using shading instead of contour lines.

procedure
(surface f
[ #:samples samples
#:width width
#:color color])
→ (-> (is-a?/c 3d-plot-area%) void?)
  f : (-> real? real? real?)
  samples : (and/c exact-integer? (>=/c 2)) = 50
  width : (>=/c 0) = 1
  color : plot-color/c = 'black

Creates 3D plot data to draw a 3D surface in a 2D box, showing only the top of the surface.

procedure
(mix data ...) → (-> any/c void?)
data : (-> any/c void?)

Creates a procedure that calls each data on its argument in order. Thus, this function can composes multiple plot datas into a single data.

procedure
(plot-color? v) → boolean?
v : any/c

Returns #t if v is one of the following symbols, #f otherwise:

'white 'black 'yellow 'green 'aqua 'pink
'wheat 'grey 'blown 'blue 'violet 'cyan
'turquoise 'magenta 'salmon 'red

12.2 Miscellaneous Functions

procedure
(derivative f [h]) → (-> real? real?)
f : (-> real? real?)
h : real? = #i1e-06

Creates a function that evaluates the numeric derivative of f. The given h is the divisor used in the calculation.

procedure
(gradient f [h])
→ (-> (vector/c real? real?) (vector/c real? real?))
f : (-> real? real? real?)
h : real? = #i1e-06

Creates a vector-valued function that computes the numeric gradient of f.

procedure
(make-vec fx fy)
→ (-> (vector/c real? real?) (vector/c real? real?))
fx : (-> real? real? real?)
fy : (-> real? real? real?)

Creates a vector-valued function from two parts.

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1	Introduction
2	2D and 3D Plotting Procedures
3	2D Renderers
4	3D Renderers
5	Nonrenderers
6	Axis Transforms and Ticks
7	Plot Utilities
8	Plot and Renderer Parameters
9	Plot Contracts
10	Porting From Plot <= 5.1.3
11	Legacy Typed Interface
12	Compatibility Module