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 How to get SelPoints of....?		  New Topic  Reply to Topic
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yogiyang

India
725 Posts
Posted - Nov 23 2018 :  05:23:11  Show Profile  Reply
Hello,

I am using following code to select the content of a layer:

if ImageEnViewMain.LayersCurrent > 0 then
   ImageEnViewMain.SelectNonAlpha();

This will create a selection around the content of selection.

Now I want to retrieve the selection points so I am trying to use following code:

for I := 0 to ImageEnViewMain.PolySelCount - 1 do
begin
    MyPolySelArray[ I ] := ImageEnViewMain.PolySel;
end;

But ImageEnViewMain.PolySelCount always comes up as Zero!

So how can we get the point of selection created using [i]SelectNonAlpha?

TIA


Yogi Yang

yogiyang

India
725 Posts
Posted - Nov 27 2018 :  23:23:16  Show Profile  Reply
Hello Nigel,

 
3. Polyline layers can be created from a selection

Now that there is a feature to create Polyline from selection in 8.1.2, there should be some way to get array of selection points.

Can you please help solve this quickly.

TIA


Yogi Yang
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xequte

38180 Posts
Posted - Nov 30 2018 :  20:10:13  Show Profile  Reply
Hi Yogi

Because of the way SelectNonAlpha() works, it produces a non-vectorial selection (i.e. a selection represented by a bitmap, rather than a path of vertices).

It is rarely practical to convert a bitmap into a vector.

To determine which pixels are selected, you can use IsPointInsideSelection, e.g.

procedure TForm1.ImageEnView1MouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
begin
  if ImageEnView1.IsPointInsideSelection(X, Y) then
    memo1.Lines.add(format('%d %d is selected', [X, Y]));
end;


Nigel
Xequte Software
www.imageen.com
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