Computer Science Canada

Movement Is "Glitchy"

Author:

Rasta Fella [ Sun Jan 15, 2006 11:18 am ]

Post subject:

Movement Is "Glitchy"

The source code below is part of the program I am making. Seems to me when I run the program the 'dot' seems to flash. Its a problem, because the commands states to redraw the dot every some odd milliseconds. Is there a way that the flashy stuff can be fixed...because I don't want a problem in the future to occur. Or is it just my computer?? I already looked through alot of the programs....and I think the command View.Update can help???

Code Below:

code:

var x, y : int
x := 20
y := 60
var chars : array char of boolean

drawfillbox(0,0,560,350,black)

loop
Input.KeyDown (chars)
if chars (KEY_UP_ARROW) then
if y <= 348 then
y := y + 1
end if
end if
if chars (KEY_RIGHT_ARROW) then
if x <= 559 then
x := x + 1
end if
end if
if chars (KEY_LEFT_ARROW) then
if x >= 1 then
x := x - 1
end if
end if
if chars (KEY_DOWN_ARROW) then
if y >= 45 then
y := y - 1
end if
end if

drawfilloval (x, y, 1, 1, white)
delay (5)
drawfilloval (x, y, 1, 1, black)
end loop

Author:

Cervantes [ Sun Jan 15, 2006 11:24 am ]

Post subject:

View.Update will indeed help.

Stick this at the top of your program:

code:

View.Set ("offscreenonly")

Then, after you've drawn your dot, do a View.Update.

Author:	Rasta Fella [ Sun Jan 15, 2006 5:16 pm ]
Post subject:
Thanks Crevantes, It works now... P.S. I like your new avatar, better then the pirate I think...

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