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RE: drawSelfOn:
From: |
Fred Wan |
Subject: |
RE: drawSelfOn: |
Date: |
Wed, 13 Sep 2000 22:04:29 +0200 |
OK, but the heatbug class has a method that handles the drawing, while in
simpleObserverBug there is no change to the bug class. Where does the
message go?
-----Original Message-----
From: address@hidden
[mailto:address@hidden Behalf Of Marcus G. Daniels
Sent: Wednesday, September 13, 2000 10:00 PM
To: address@hidden
Subject: Re: drawSelfOn:
>>>>> "FW" == Fred Wan <address@hidden> writes:
FW> I have trouble understanding the following fragment in
FW> SimpleObserverBug and translating it to Java. Can someone help me
FW> out here? Especially the M(drawSelfOn) is puzzling. In jheatbugs a
FW> message is sent to a heatbug object that then draws itself, but
FW> what happens here is unclear.
It's the same idea. The drawSelfOn: message gets sent to the Bug instances
in the world. drawSelfOn: gets passed the raster that you specify
via setDisplayWidget:. Without the argument, the Bug would not have any
info about where to draw itself. (That's at the end of Bug.m.)
The setObjectCollection: is optional. It makes it faster to send the
drawSelfOn: messages (otherwise it is necessary to look at all the points
on the grid). The grid itself is specified by setDiscrete2dDisplay:, and
it is needed in order to track where Bugs are.
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- Re: drawSelfOn:, Marcus G. Daniels, 2000/09/13
- RE: drawSelfOn:,
Fred Wan <=