►Mr Lib: Extra GUI Libraries
▼6 Graphs
On this page:
add-links
add-links/ text-colors
remove-links
set-link-label
  top← prev  up  next → 

6.5 Graph Functions

(add-links parent child) → void?
  parent : (is-a?/c graph-snip<%>)
  child : (is-a?/c graph-snip<%>)
(add-links parent child) → void?
  parent : (is-a?/c graph-snip<%>)
  child : (is-a?/c graph-snip<%>)
(add-links parent    
  child    
  dark-pen    
  light-pen    
  dark-brush    
  light-brush    
  [label]) → void?
  parent : (is-a?/c graph-snip<%>)
  child : (is-a?/c graph-snip<%>)
  dark-pen : (or/c (is-a?/c pen) false/c)
  light-pen : (or/c (is-a?/c pen) false/c)
  dark-brush : (or/c (is-a?/c brush%) false/c)
  light-brush : (or/c (is-a?/c brush%) false/c)
  label : (or/c string? false/c) = #f
(add-links parent    
  child    
  dark-pen    
  light-pen    
  dark-brush    
  light-brush    
  dx    
  dy    
  [label]) → void?
  parent : (is-a?/c graph-snip<%>)
  child : (is-a?/c graph-snip<%>)
  dark-pen : (or/c (is-a?/c pen) false/c)
  light-pen : (or/c (is-a?/c pen) false/c)
  dark-brush : (or/c (is-a?/c brush%) false/c)
  light-brush : (or/c (is-a?/c brush%) false/c)
  dx : real?
  dy : real?
  label : (or/c string? false/c) = #f
Connects a parent snip to a child snip within a pasteboard.

The default dark-pen/dark-brush and light-pen/light-brush are blue and purple, respectively. The dark-pen and dark-brush are used when the mouse cursor is over the snip (or a child or parent), and the light-pen and light-brush are used when the mouse cursor is not over the snip. The brush is used to draw inside the arrow head and the pen is used to draw the border of the arrowhead and the line connecting the two snips.

if label is provided and not #f, it is used as a label on the edge.

When dx and dy are provided, the are offsets for the head and the tail of the arrow. Otherwise, 0 offsets are used.

(add-links/text-colors parent    
  child    
  dark-pen    
  light-pen    
  dark-brush    
  light-brush    
  dark-text    
  light-text    
  dx    
  dy    
  label) → void?
  parent : (is-a?/c graph-snip<%>)
  child : (is-a?/c graph-snip<%>)
  dark-pen : (or/c (is-a?/c pen) false/c)
  light-pen : (or/c (is-a?/c pen) false/c)
  dark-brush : (or/c (is-a?/c brush%) false/c)
  light-brush : (or/c (is-a?/c brush%) false/c)
  dark-text : (or/c (is-a?/c color%) false/c)
  light-text : (or/c (is-a?/c color) false/c)
  dx : real?
  dy : real?
  label : (or/c string? false/c)
Like add-links, but with extra dark-text and light-text arguments to set the colors of the label.

(remove-links parent child) → void?
  parent : (is-a?/c graph-snip<%>)
  child : (is-a?/c graph-snip<%>)
Disconnects a parent snip from a child snip within a pasteboard.

(set-link-label parent child label) → void?
  parent : (is-a?/c graph-snip<%>)
  child : (is-a?/c graph-snip<%>)
  label : (or/c string? false/c)
Changes the label on the edge going from child to parent to be label. If there is no existing edge between the two nodes, then nothing happens.

  top← prev  up  next →