▼PLo  T:   Graph Plotting
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plot/  dc
5.3.4
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2 2D Plot Procedures

procedure

(plot renderer-tree 
  [#:x-min x-min 
  #:x-max x-max 
  #:y-min y-min 
  #:y-max y-max 
  #:width width 
  #:height height 
  #:title title 
  #:x-label x-label 
  #:y-label y-label 
  #:legend-anchor legend-anchor 
  #:out-file out-file 
  #:out-kind out-kind]) 
 → (or/c (is-a?/c image-snip%) void?)
  renderer-tree : (treeof (or/c renderer2d? nonrenderer?))
  x-min : (or/c rational? #f) = #f
  x-max : (or/c rational? #f) = #f
  y-min : (or/c rational? #f) = #f
  y-max : (or/c rational? #f) = #f
  width : exact-positive-integer? = (plot-width)
  height : exact-positive-integer? = (plot-height)
  title : (or/c string? #f) = (plot-title)
  x-label : (or/c string? #f) = (plot-x-label)
  y-label : (or/c string? #f) = (plot-y-label)
  legend-anchor : anchor/c = (plot-legend-anchor)
  out-file : (or/c path-string? output-port? #f) = #f
  out-kind : (one-of/c 'auto 'png 'jpeg 'xmb 'xpm 'bmp 'ps 'pdf 'svg)
   = 'auto
Plots a 2D renderer or list of renderers (or more generally, a tree of renderers), as returned by points, function, contours, discrete-histogram, and others.

By default, plot produces a Racket value that is displayed as an image and can be manipulated like any other value. For example, they may be put in lists:

> (parameterize ([plot-width    150]
                 [plot-height   150]
                 [plot-x-label  #f]
                 [plot-y-label  #f])
    (list (plot (function sin (- pi) pi))
          (plot (function sqr -2 2))))

'(image image)

When the parameter plot-new-window? is #t, plot opens a new window to display the plot and returns (void).

When #:out-file is given, plot writes the plot to a file using plot-file as well as returning an image-snip% or opening a new window.

When given, the x-min, x-max, y-min and y-max arguments determine the bounds of the plot, but not the bounds of the renderers. For example,

> (plot (function (λ (x) (sin (* 4 x))) -1 1)
        #:x-min -1.5 #:x-max 1.5 #:y-min -1.5 #:y-max 1.5)

image

Here, the renderer draws in [-1,1] × [-1,1], but the plot area is [-1.5,1.5] × [-1.5,1.5].

Deprecated keywords. The #:fgcolor and #:bgcolor keyword arguments are currently supported for backward compatibility, but may not be in the future. Please set the plot-foreground and plot-background parameters instead of using these keyword arguments. The #:lncolor keyword argument is also accepted for backward compatibility but deprecated. It does nothing.

procedure

(plot-file renderer-tree    
  output    
  [kind]    
  #:<plot-keyword> <plot-keyword> ...) → void?
  renderer-tree : (treeof (or/c renderer2d? nonrenderer?))
  output : (or/c path-string? output-port?)
  kind : (one-of/c 'auto 'png 'jpeg 'xmb 'xpm 'bmp 'ps 'pdf 'svg)
   = 'auto
  <plot-keyword> : <plot-keyword-contract>

procedure

(plot-pict renderer-tree ...) → pict?

  renderer-tree : (treeof (or/c renderer2d? nonrenderer?))

procedure

(plot-bitmap renderer-tree ...) → (is-a?/c bitmap%)

  renderer-tree : (treeof (or/c renderer2d? nonrenderer?))

procedure

(plot-snip renderer-tree ...) → (is-a?/c image-snip%)

  renderer-tree : (treeof (or/c renderer2d? nonrenderer?))

procedure

(plot-frame renderer-tree ...) → (is-a?/c frame%)

  renderer-tree : (treeof (or/c renderer2d? nonrenderer?))
Plot to different backends. Each of these procedures has the same keyword arguments as plot, except for deprecated keywords.

Use plot-file to save a plot to a file. When creating a JPEG file, the parameter plot-jpeg-quality determines its quality. When creating a PostScript or PDF file, the parameter plot-ps/pdf-interactive? determines whether the user is given a dialog for setting printing parameters. (See post-script-dc% and pdf-dc%.) When kind is 'auto, plot-file tries to determine the kind of file to write from the file name extension.

Use plot-pict to plot to a slideshow pict. For example,
#lang slideshow
(require plot)
 
(plot-font-size (current-font-size))
(plot-width (current-para-width))
(plot-height 600)
(plot-background-alpha 1/2)
 
(slide
 #:title "A 2D Parabola"
 (plot-pict (function sqr -1 1 #:label "y = x^2")))
creates a slide containing a 2D plot of a parabola.

Use plot-bitmap to create a bitmap%.

Use plot-frame to create a frame% regardless of the value of plot-new-window?. The frame is initially hidden.

Use plot-snip to create an interactive image-snip% regardless of the value of plot-new-window?.

procedure

(plot/dc renderer-tree    
  dc    
  x    
  y    
  width    
  height    
  [#:x-min x-min    
  #:x-max x-max    
  #:y-min y-min    
  #:y-max y-max    
  #:title title    
  #:x-label x-label    
  #:y-label y-label    
  #:legend-anchor legend-anchor]) → void?
  renderer-tree : (treeof (or/c renderer2d? nonrenderer?))
  dc : (is-a?/c dc<%>)
  x : real?
  y : real?
  width : (>=/c 0)
  height : (>=/c 0)
  x-min : (or/c rational? #f) = #f
  x-max : (or/c rational? #f) = #f
  y-min : (or/c rational? #f) = #f
  y-max : (or/c rational? #f) = #f
  title : (or/c string? #f) = (plot-title)
  x-label : (or/c string? #f) = (plot-x-label)
  y-label : (or/c string? #f) = (plot-y-label)
  legend-anchor : anchor/c = (plot-legend-anchor)
Plots to an arbitrary device context, in the rectangle with width width, height height, and upper-left corner x,y.

Every 2D Plot Procedures procedure is defined in terms of plot/dc.

Use this if you need to continually update a plot on a canvas%, or to create other plot-like functions with different backends.

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