6.6 DUIM-Graphics Module
draw-arrow
Generic function
Summary
Draws an arrow between two specified points.
Signature
draw-arrow drawable x1 y1 x2 y2 #key from-head? to-head? head-length head-width => ()
draw-arrow* drawable point1 point2 #key from-head? to-head? head-length head-width => ()
Arguments
- drawable
- An instance of type
type-union(<sheet>, <medium>). - from-head?
- An instance of type
<boolean>. Default value:#f. - to-head?
- An instance of type
<boolean>. Default value:#t. - head-length
- An instance of type
<integer>. Default value:10. - head-width
- An instance of type
<integer>. Default value:5.
The following arguments are specific to draw-arrow.
- x1
- An instance of type
<real>. - y1
- An instance of type
<real>. - x2
- An instance of type
<real>. - y2
- An instance of type
<real>.
The following arguments are specific to draw-arrow*.
- point1
- An instance of type
<transform>. - point2
- An instance of type
<transform>.
Values
- None.
Library
duim-graphics
Module
duim-graphics
Description
Draws an arrow on drawable between two (x1,y1) and (x2, y2), using the current pen. Dashed lines start dashing from the first point.
If from-head? is #t, then the arrow-head points from (x1,y1) to (x2, y2). If to-head? is #t, then the arrow-head points from (x2, y2) to (x1,y1).
If both from-head? and to-head? are #t, then a double-headed arrow is drawn.
The arguments head-length and head-width specify the length and width of the arrow-head respectively, in pixels.
The function draw-arrow* is identical to draw-arrow, except that it passes composite objects, rather than separate coordinates, in its arguments. You should be aware that using this function may lead to a loss of performance.