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Author
Topic: Redrawing form (Read 1287 times)
pascal111
Sr. Member
Posts: 423
Un trabajo en equipo para programas serias.
Redrawing form
«
on:
April 21, 2021, 03:38:06 am »
I'm trying in the next piece of code to delay the drawing of line of pixels to see some motion, but I failed to make the form to redraw itself again each determined time of "delay" procedure:
Code: Pascal
[Select]
[+]
[-]
procedure
TForm1
.
FormPaint
(
Sender
:
TObject
)
;
var
i
:
integer
;
begin
for
i
:
=
1
to
100
do
begin
canvas
.
Pixels
[
i
,
10
]
:
=
clblue
;
self
.
update
;
delay
(
100
)
;
end
;
end
;
Logged
La chose par la chose est rappelé.
engkin
Hero Member
Posts: 3112
Re: Redrawing form
«
Reply #1 on:
April 21, 2021, 04:11:11 am »
After delay call Application.ProcessMessages.
The correct way is to use a timer.
If you draw on the form, it will not retain the image when covered with some other window.
«
Last Edit: April 21, 2021, 04:17:35 am by engkin
»
Logged
engkin
Hero Member
Posts: 3112
Re: Redrawing form
«
Reply #2 on:
April 21, 2021, 04:59:46 am »
Check attached project
Logged
pascal111
Sr. Member
Posts: 423
Un trabajo en equipo para programas serias.
Re: Redrawing form
«
Reply #3 on:
April 21, 2021, 01:25:57 pm »
I made some changes depending on attached project "simple", and it works.
Code: Pascal
[Select]
[+]
[-]
var
Form1
:
TForm1
;
x
:
integer
;
procedure
TForm1
.
FormPaint
(
Sender
:
TObject
)
;
begin
canvas
.
Pixels
[
x
,
10
]
:
=
clblue
;
end
;
procedure
TForm1
.
Timer1Timer
(
Sender
:
TObject
)
;
begin
if
x>
=
100
then
exit
else
inc
(
x
)
;
Invalidate
;
end
;
With modifying "interval" property of the timer.
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Redrawing form
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