Lazarus
Home
Help
TinyPortal
Search
Login
Register
Lazarus
»
Forum
»
Free Pascal
»
Beginners
(Moderators:
FPK
,
Tomas Hajny
) »
Initializing TRect
Free Pascal
Website
Downloads
Wiki
Documentation
Bugtracker
Mailing List
Lazarus
Website
Downloads (Laz+FPC)
Packages (OPM)
FAQ
Wiki
Documentation (RTL/FCL/LCL)
Bugtracker
CCR Bugs
IRC channel
GIT
Mailing List
Other languages
Foundation
Website
Useful Wiki Links
Project Roadmap
Getting the Source
Screenshots
How to use the forum
About donations (wiki)
Bookstore
Computer Math and Games in Pascal
(preview)
Lazarus Handbook
Search
Advanced search
Recent
A fairly simple sound sol...
by
VisualLab
[
Today
at 12:48:08 pm]
Multithreading - synchron...
by
Martin_fr
[
Today
at 12:41:07 pm]
May be useful to somebody
by
KodeZwerg
[
Today
at 12:38:22 pm]
Can function be used for ...
by
VisualLab
[
Today
at 12:18:23 pm]
match automatic highlight...
by
Чебурашка
[
Today
at 11:35:14 am]
Tchart with dual numbers ...
by
wp
[
Today
at 10:48:18 am]
trunk compiler bug for mi...
by
Key-Real
[
Today
at 10:44:52 am]
Generics - correct syntax
by
VisualLab
[
Today
at 10:23:16 am]
Compile/Convert Delphi pr...
by
TRon
[
Today
at 09:59:52 am]
add new targets to make
by
Key-Real
[
Today
at 09:38:23 am]
Debugger crashes with App...
by
Martin_fr
[
Today
at 09:29:46 am]
Copyrights Q
by
BrassGear
[
Today
at 09:13:14 am]
[SOLVED] how to build the...
by
Key-Real
[
Today
at 09:12:33 am]
Quirky windows
by
tetrastes
[
Today
at 08:59:06 am]
How can I draw a rectangl...
by
Handoko
[
Today
at 07:30:55 am]
Draw a line in the Scroll...
by
Handoko
[
Today
at 07:27:54 am]
Offical launch of the 1 B...
by
Handoko
[
Today
at 06:05:11 am]
web development using pas...
by
Nate897
[
Today
at 02:04:05 am]
questionable function def...
by
440bx
[
Today
at 01:35:28 am]
Why isn't TTIRadioGroup's...
by
jamie
[
Today
at 12:13:45 am]
Same project and two Pcs
by
caiov1n1c1us
[
Today
at 12:04:00 am]
v3.99 code completion que...
by
440bx
[April 22, 2024, 11:08:26 pm]
[SOLVED]RichMemo StringRe...
by
KodeZwerg
[April 22, 2024, 08:44:40 pm]
[SOLVED] LAMW/Linux - Ins...
by
Alcatiz
[April 22, 2024, 08:04:06 pm]
[SOLVED] TimeStampToMSecs...
by
korba812
[April 22, 2024, 06:23:33 pm]
« previous
next »
Print
Pages: [
1
]
Author
Topic: Initializing TRect (Read 1018 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
Print
Pages: [
1
]
« previous
next »
Lazarus
»
Forum
»
Free Pascal
»
Beginners
(Moderators:
FPK
,
Tomas Hajny
) »
Initializing TRect
TinyPortal
© 2005-2018