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world docs updated

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svn: r2518
This commit is contained in:
Matthias Felleisen 2006-03-27 15:33:35 +00:00
parent c3803982eb
commit f1d1e3e8a1
1 changed files with 24 additions and 1 deletions
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teachpack/htdp/Docs/world.thtml
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@ -33,6 +33,27 @@ students to simulate a small world of animated drawings and games:
or the events of releasing a key on the keypad.
</pre>
<li><code>{(idx on-mouse-event)} : (World Number Number MouseEvent ->
World) -> true</code><br> <code>(on-mouse-event clack)</code> means that
DrScheme must call <code>clack</code> on the current world, the current
<code>x</code> and <code>y</code> coordinates of the mouse, and and a
(representation of the) mouseevent for every action of the mouse the programmer
(user of the computer) makes; it uses the result as the next world
<pre>
<code>
;; A MouseEventType is one of:
;; - 'button-down
;; - 'button-up
;; - 'drag
;; - 'move
;; - 'enter
;; - 'leave
</code>
The symbols denote the appropriate action with the mouse and (any of)
its button(s).
</pre>
<li><code>{(idx on-redraw)} : (World -> Image) -> true</code><br>
<code>(on-tick-event world->image)</code> means that DrScheme
calls <code>world->image</code> whenever the canvas must be redrawn; the
@ -69,6 +90,8 @@ students to simulate a small world of animated drawings and games:
shows the list of images in loi, time-delayed
</menu></p>
<p>Finally, the teachpack provides all the functions that image.ss provides. </p>
<p>Finally, the teachpack provides all the functions that image.ss provides
except <code>add-line</code>, which has a slightly different functionality.</p>
{(include "foot.tinc")}