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Draw on image and get proportional coordinates
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Topic: Draw on image and get proportional coordinates (Read 2935 times)
xinyiman
Hero Member
Posts: 2256
Draw on image and get proportional coordinates
«
on:
October 01, 2018, 12:13:31 pm »
Hi guys, I have a need. I have to draw some dots on a proportional image and then if I click on one of the dots with the mouse, I have to return the id of the dot. So to understand we have to draw a football field, then above the disposition of the players, the problem is that the field must be resizable. I attach a project that does not work as I would like.
Url of example:
www.lazaruspascal.it/esempi/test_cc.zip
Logged
Win10, Ubuntu and Mac
Lazarus: 2.1.0
FPC: 3.3.1
balazsszekely
Guest
Re: Draw on image and get proportional coordinates
«
Reply #1 on:
October 01, 2018, 01:29:47 pm »
You're method seems overcomplicated to me. Why don't you use regions to determine the position of the players?
«
Last Edit: October 01, 2018, 01:36:02 pm by GetMem
»
Logged
xinyiman
Hero Member
Posts: 2256
Re: Draw on image and get proportional coordinates
«
Reply #2 on:
October 01, 2018, 02:17:51 pm »
How? One example
Logged
Win10, Ubuntu and Mac
Lazarus: 2.1.0
FPC: 3.3.1
balazsszekely
Guest
Re: Draw on image and get proportional coordinates
«
Reply #3 on:
October 01, 2018, 02:20:05 pm »
Quote
How? One example
Here you go:
Code: Pascal
[Select]
[+]
[-]
uses
LCLType
,
LCLIntf
;
type
TData
=
record
FX
,
FY
,
FR
:
Integer
;
FRgn
:
HRGN
;
end
;
var
Data
:
array
of
TData
;
procedure
TForm1
.
FormCreate
(
Sender
:
TObject
)
;
begin
//just some random circles
SetLength
(
Data
,
3
)
;
with
Data
[
0
]
do
begin
FX
:
=
10
;
FY
:
=
10
;
FR
:
=
30
;
FRgn
:
=
CreateEllipticRgn
(
FX
,
FY
,
FX
+
FR
,
FY
+
FR
)
;
end
;
with
Data
[
1
]
do
begin
FX
:
=
120
;
FY
:
=
130
;
FR
:
=
30
;
FRgn
:
=
CreateEllipticRgn
(
FX
,
FY
,
FX
+
FR
,
FY
+
FR
)
;
end
;
with
Data
[
2
]
do
begin
FX
:
=
100
;
FY
:
=
40
;
FR
:
=
30
;
FRgn
:
=
CreateEllipticRgn
(
FX
,
FY
,
FX
+
FR
,
FY
+
FR
)
;
end
;
end
;
procedure
TForm1
.
FormMouseDown
(
Sender
:
TObject
;
Button
:
TMouseButton
;
Shift
:
TShiftState
;
X
,
Y
:
Integer
)
;
var
Res
:
Bool
;
I
:
Integer
;
begin
for
I
:
=
Low
(
Data
)
to
High
(
Data
)
do
begin
Res
:
=
PtInRegion
(
Data
[
I
]
.
FRgn
,
X
,
Y
)
;
if
Res
then
begin
ShowMessage
(
'You clicked circle '
+
IntToStr
(
I
+
1
)
)
;
Break
;
end
;
end
;
end
;
procedure
TForm1
.
FormPaint
(
Sender
:
TObject
)
;
var
I
:
Integer
;
begin
with
Self
.
Canvas
do
begin
Pen
.
Width
:
=
2
;
Pen
.
Color
:
=
clBlack
;
Brush
.
Color
:
=
clRed
;
end
;
for
I
:
=
Low
(
Data
)
to
High
(
Data
)
do
Self
.
Canvas
.
Ellipse
(
Data
[
I
]
.
FX
,
Data
[
I
]
.
FY
,
Data
[
I
]
.
FX
+
Data
[
I
]
.
FR
,
Data
[
I
]
.
FY
+
Data
[
I
]
.
FR
)
;
end
;
Logged
xinyiman
Hero Member
Posts: 2256
Re: Draw on image and get proportional coordinates
«
Reply #4 on:
October 01, 2018, 04:45:41 pm »
Thank you very much
Logged
Win10, Ubuntu and Mac
Lazarus: 2.1.0
FPC: 3.3.1
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1
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»
Graphics
(Moderator:
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) »
Draw on image and get proportional coordinates
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