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Initializing TRect
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Author
Topic: Initializing TRect (Read 1021 times)
del
Sr. Member
Posts: 258
Initializing TRect
«
on:
February 24, 2021, 03:06:35 pm »
According to:
https://www.freepascal.org/docs-html/current/rtl/objects/trect.copy.html
I can use
Code: Pascal
[Select]
[+]
[-]
m_mask
.
Assign
(
-
1
,
-
1
,
-
1
,
-
1
)
;
to initialize the TRect. But I get this error:
Quote
MyClasses.pas(438,9) Error: identifier idents no member "Assign"
However, when I use this form of initialization, everything is fine:
Code: Pascal
[Select]
[+]
[-]
m_mask
:
=
Rect
(
-
1
,
-
1
,
-
1
,
-
1
)
;
So obviously I found a solution. The variable m_mask is declared here:
Code: Pascal
[Select]
[+]
[-]
m_mask
:
TRect
;
FWIW.
«
Last Edit: February 24, 2021, 03:08:16 pm by del
»
Logged
howardpc
Hero Member
Posts: 4144
Re: Initializing TRect
«
Reply #1 on:
February 24, 2021, 04:10:37 pm »
To use TRect methods such as Assign you need the TRect declared in the Objects unit (as the documentation example shows).
«
Last Edit: February 24, 2021, 04:13:52 pm by howardpc
»
Logged
jcmontherock
Full Member
Posts: 236
Re: Initializing TRect
«
Reply #2 on:
February 24, 2021, 04:11:57 pm »
For that I am using: Rect := Bounds(Left, Top, Width, Height); and Rect.SetBounds(Left, Top, Width, Height);
Logged
Windows 11 UTF8-64 - Lazarus 3.2-64 - FPC 3.2.2
balazsszekely
Guest
Re: Initializing TRect
«
Reply #3 on:
February 24, 2021, 05:35:40 pm »
@del
You can achieve the same result without the object unit, just use the cross platform CopyRect and EqualRect apis.
Code: Pascal
[Select]
[+]
[-]
uses
LCLIntf
;
procedure
TForm1
.
Button1Click
(
Sender
:
TObject
)
;
var
R1
,
R2
,
R3
:
TRect
;
begin
R1
:
=
TRect
.
Create
(
10
,
100
,
50
,
200
)
;
R2
:
=
TRect
.
Create
(
10
,
100
,
50
,
200
)
;
R3
:
=
TRect
.
Create
(
-
1
,
-
1
,
-
1
,
-
1
)
;
CopyRect
(
R3
,
R2
)
;
if
EqualRect
(
R1
,
R3
)
then
ShowMessage
(
'Equal'
)
else
ShowMessage
(
'Not equal'
)
;
end
;
Logged
del
Sr. Member
Posts: 258
Re: Initializing TRect
«
Reply #4 on:
February 24, 2021, 09:31:53 pm »
Thanks everybody.
Logged
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Initializing TRect
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