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 ImageEn Library for Delphi, C++ and .Net
 ImageEn and IEvolution Support Forum
 Polyline layer creation
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pierrotsc

USA
476 Posts

Posted - Apr 18 2021 :  13:34:52  Show Profile  Reply
I think i am trying too hard but cannot figure out this one.
I have a background picture and want to draw a polyline on another layer on top of my background.

I am missing something. every time i draw, it had the polyline on the same layer as the background.
Here's my code.
ActiveImageEnView().MouseInteractGeneral := [];
ActiveImageEnView().LayerOptions := ActiveImageEnView().LayerOptions +
[loAllowMultiSelect, loAutoSelectMask, loShowRotationGrip];


ActiveImageEnView().LayersAdd(TIELayerKind(ielkPolyline));
ActiveImageEnView().LayersAutoClosePolylines := iecmOnNearFinish;
ActiveImageEnView().MouseInteractLayers := [mlMoveLayers, mlEditLayerPoints,
mlRotateLayers, mlResizeLayers, mlDrawCreatePolylineLayers];
ActiveImageEnView().CurrentLayer.FillColor := clNone;
ActiveImageEnView().CurrentLayer.BorderWidth := 3;
ActiveImageEnView().CurrentLayer.BorderColor := clred;
ActiveImageEnView().Update;

Thank you
Pierre

xequte

6517 Posts

Posted - Apr 19 2021 :  00:56:45  Show Profile  Reply
Hi Pierre

Have you tried the demo:

\Demos\LayerEditing\Layers_Lines\Layers.dpr

Looking at your code you add a blank polyline layer, that is not needed:

ActiveImageEnView().LayersAdd(TIELayerKind(ielkPolyline));

As mlDrawCreatePolylineLayers will automatically create a polyline layer as the user draws.

If you check ActiveImageEnView().LayersCount (or a TImageEnLayerMView to your project), you will see it will increase as each polyline is drawn.





Nigel
Xequte Software
www.imageen.com
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pierrotsc

USA
476 Posts

Posted - Apr 19 2021 :  08:01:01  Show Profile  Reply
Originally the line
ActiveImageEnView().LayersAdd(TIELayerKind(ielkPolyline));

was commented.
when i draw, the polyline is showing on my background layer in the TImageEnLayerMView window. it does not add another layer.

I will look at the layer demo.

Thanks
Pierre
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pierrotsc

USA
476 Posts

Posted - Apr 19 2021 :  11:43:16  Show Profile  Reply
Just looked at the layer demo. it uses the
ImageEnView1.LayersAdd( TIELayerKind( cmbAddLayer.ItemIndex ));

So when i do that, it works too.
It does not use the mlDrawCreatePolylineLayers
On the newlayer event, it makes an explosion. Not really what i am looking for.
case LayerKind of
ielkPolyline : if mlCreatePolylineLayers in ImageEnView1.MouseInteractLayers then // This ensures we don't fill the points when drawing our own polyline using mlClickCreatePolylineLayer
TIEPolylineLayer( ImageEnView1.CurrentLayer ).SetPoints( iesExplosion, True );

So, for me using :
ActiveImageEnView().MouseInteractLayers := [mlMoveLayers, mlEditLayerPoints,
mlRotateLayers, mlResizeLayers, mlDrawCreatePolylineLayers];

do draw a polyline but not on a new layer.

Best
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xequte

6517 Posts

Posted - Apr 19 2021 :  17:29:06  Show Profile  Reply
Hi

I think there might be some confusion. mlDrawCreatePolylineLayers cannot "draw" onto an image layer (background is image layer) so a new layer must be being created in this situation.

Did you change LayersCount?

Please add a TImageEnLayerMView, connect it to the TImageEnView and observe what happens when you draw a polyline (a new polyline layer should appear).



Nigel
Xequte Software
www.imageen.com
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xequte

6517 Posts

Posted - Apr 19 2021 :  17:31:27  Show Profile  Reply
Also, you have looked at the wrong demo. Please look at this one:

\Demos\LayerEditing\Layers_Lines\Layers.dpr

Which shows freehand polyline drawing.

Nigel
Xequte Software
www.imageen.com
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pierrotsc

USA
476 Posts

Posted - Apr 19 2021 :  17:33:32  Show Profile  Reply
Ok, when I draw a poly line on top of my image background, the layer view only show the layer background with the poly line inside. So I get one layer and not 2. I have a timageenmview layer connected to my imageenview.
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xequte

6517 Posts

Posted - Apr 19 2021 :  17:39:38  Show Profile  Reply
Hi

Please attach some screenshots so I can better understand what is happening.



Nigel
Xequte Software
www.imageen.com
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pierrotsc

USA
476 Posts

Posted - Apr 19 2021 :  18:25:04  Show Profile  Reply
So i drew a polyline on top of my image background. the brush color filled it.

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xequte

6517 Posts

Posted - Apr 20 2021 :  01:54:22  Show Profile  Reply
Hi

You must have some auto-merge code in this unit. In your OnLayerNotify event perhaps??? Please email me the source for this demo.

Nigel
Xequte Software
www.imageen.com
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pierrotsc

USA
476 Posts

Posted - Apr 20 2021 :  08:15:54  Show Profile  Reply
Nigel, you are correct. did not look at that because every kind of other layer i add, it did not behave live that. i wonder why. this is my onlayer event

procedure TMainForm.ImageEnViewLayerNotifyEx(Sender: TObject; layer: Integer;
  Event: TIELayerEvent);
const
  Auto_Merge_Layers = true;
begin
  if Auto_Merge_Layers and (layer > 0) then
  begin
    // For text layers with automatic text editing (loAutoTextEditing in LayerOptions) don't merge till we complete editing
    if ((TImageEnView(Sender).Layers[layer].Kind = ielkText) and
      (Event = ielEdited)) or
      ((TImageEnView(Sender).Layers[layer].Kind <> ielkText) and
      (Event = ielCreated)) then
      TImageEnView(Sender).LayersMerge(0, layer);
  end;
end;


The thing is, would it not merge text layers only ?
Best
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pierrotsc

USA
476 Posts

Posted - Apr 20 2021 :  14:36:44  Show Profile  Reply
Nigel, i found my coding error. Thanks for finding the auto_merge culprit.
Best
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