Hello Renaud,
QTk tries hard to catch Tcl exceptions to report them at the Oz level.
Each method invocation on a canvas item will bounce a message between
the Oz and Tcl/Tk process, which can take some time. You can have an
easy speed up by using the asynchronous tk method instead.
C
Win={QTk.build td(canvas(handle:C))}
{Win show}
T={C newTag($)}
{C create(rect 10 10 100 100 tags:T)}
%% instead of {T move(10 10)} use:
{T tk(move 10 10)}
Warning:I didn't check this code.
A+
Donatien
Renaud De Landtsheer wrote:
I want to implement a game in Oz (a kind of Ping-Pong) with graphical
interface.
In my game, there is a ball that moves on a playground.
The graphical interface is implemented with QTk.
I have implemented the playground with a canvas an the ball is
represented a circle drawn on the canvas with the command "oval".
A thread updates the position of the ball every 10 or 20 ms.
The point is that the ball does not seem to move smoothly.
Sometime I can also see two balls on the playground (one at the old
position and one at the new position).
I was thinking about using double buffering to solve the "two
position" problem and maybe for speeding up the ball update process
but I could not find double buffering -related commands in QTk.
I know about process scheduling issues related with operating system
stuff and I know I do not get a 10 or 20 ms delay. Maybe I can do
something there, but what?
Any idea? Thank you.
--
Renaud De Landtsheer
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