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Author
Topic: drawing on timage canvas (Read 625 times)
alaa123456789
Sr. Member
Posts: 260
Try your Best to learn & help others
drawing on timage canvas
«
on:
June 25, 2022, 07:25:09 pm »
hi all ,
why timage color is always black even we change the color in the code to white
Code: Pascal
[Select]
[+]
[-]
unit
Unit1
;
{$mode objfpc}{$H+}
interface
uses
Classes
,
SysUtils
,
Math
,
Forms
,
Controls
,
Graphics
,
Dialogs
,
ExtCtrls
,
StdCtrls
;
type
{ TForm1 }
TForm1
=
class
(
TForm
)
Button1
:
TButton
;
Button2
:
TButton
;
Image1
:
TImage
;
ScrollBox1
:
TScrollBox
;
procedure
Button1Click
(
Sender
:
TObject
)
;
procedure
Button2Click
(
Sender
:
TObject
)
;
private
public
end
;
var
Form1
:
TForm1
;
implementation
{$R *.lfm}
{ TForm1 }
procedure
TForm1
.
Button1Click
(
Sender
:
TObject
)
;
var
xcenter
,
ycenter
:
longint
;
begin
xcenter
:
=
Image1
.
Width
div
2
;
ycenter
:
=
Image1
.
Height
div
2
;
with
Image1
.
Canvas
do
begin
Brush
.
Color
:
=
clWhite
;
MoveTo
(
xcenter
,
ycenter
)
;
Pen
.
Color
:
=
clGreen
;
LineTo
(
20
,
20
)
;
end
;
end
;
Logged
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jamie
Hero Member
Posts: 6130
Re: drawing on timage canvas
«
Reply #1 on:
June 25, 2022, 07:47:01 pm »
Set the Picture property width, height ?
and you may need to draw on the picture property because the canvas is just the display surface and most likely will get covered.
Logged
The only true wisdom is knowing you know nothing
alaa123456789
Sr. Member
Posts: 260
Try your Best to learn & help others
Re: drawing on timage canvas
«
Reply #2 on:
June 25, 2022, 08:06:34 pm »
i found the solution
thanks
Code: Pascal
[Select]
[+]
[-]
procedure
TForm1
.
Button2Click
(
Sender
:
TObject
)
;
var
bm
:
TBitmap
;
begin
bm
:
=
TBitmap
.
Create
;
with
bm
do
begin
bm
.
Width
:
=
Image1
.
Width
;
bm
.
Height
:
=
Image1
.
Height
;
with
Canvas
do
begin
Brush
.
Color
:
=
clWhite
;
FillRect
(
ClipRect
)
;
Pen
.
Width
:
=
3
;
Pen
.
Color
:
=
clRed
;
MoveTo
(
10
,
10
)
;
LineTo
(
190
,
190
)
;
end
;
end
;
Image1
.
Picture
.
Bitmap
:
=
BM
;
BM
.
Free
;
end
;
«
Last Edit: June 25, 2022, 08:43:50 pm by alaa123456789
»
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