## Future of SimpleGraph

Please post bug reports, feature requests, or any question regarding the DELPHI AREA projects here.

### Future of SimpleGraph

Hi. Where can I know about your feature plans of TSimpleGraph? Do you plan to make polylines? Thanks.
shternlib
Active Member

Posts: 5
Joined: June 28th, 2004, 7:34 am
Location: Russia

Frankly, no future plan!

Defining a new polyline node is very easy. You just need to subclass a new class from TPloygonalNode and override two simple methods.

For example here is the definitian of TTriangularNode:

Code: Select all
TTriangularNode = class(TPolygonalNode)  protected    function GetMaxTextRect: TRect; override;    class procedure DefineVertices(const ARect: TRect; var Points: TPointArray); override;  end;class procedure TTriangularNode.DefineVertices(const ARect: TRect;  var Points: TPointArray);begin  SetLength(Points, 3);  with ARect do  begin    with Points[0] do    begin      X := (Left + Right) div 2;      Y := Top;    end;    with Points[1] do    begin      X := Right;      Y := Bottom;    end;    with Points[2] do    begin      X := Left;      Y := Bottom;    end;  end;end;function TTriangularNode.GetMaxTextRect: TRect;begin  with Result do  begin    Left := (Vertices[0].X + Vertices[2].X) div 2;    Top := (Vertices[0].Y + Vertices[2].Y) div 2;    Right := (Vertices[0].X + Vertices[1].X) div 2;    Bottom := Vertices[1].Y;  end;  OffsetRect(Result, -Left, -Top);  IntersectRect(Result, Result, inherited GetMaxTextRect);end;

By the way, to be able to read a newly defined node from a stream, you have to register its class to SimpleGraph as follow:

Code: Select all
TSimpleGraph.Register(TTriangularNode);

That's all.

Kambiz

Posts: 2429
Joined: March 7th, 2003, 7:10 pm

Is it possible to make polyline link? F.e. link from node A to node B and another link from B to A?
shternlib
Active Member

Posts: 5
Joined: June 28th, 2004, 7:34 am
Location: Russia

For this purpose you have to subclass TGraphLink, and add some intermediate points to the link. Also, the new link class should be registered to the SimpleGraph, as same as node classes.

To be honest, it's lot of work and because of that I didn't implement it myself. Who knows, maybe in future I do it.

Kambiz

Posts: 2429
Joined: March 7th, 2003, 7:10 pm

### :D

And what is needed to make this moment closure?
shternlib
Active Member

Posts: 5
Joined: June 28th, 2004, 7:34 am
Location: Russia

(Motivation + Spare Time) . (a lot)

Kambiz

Posts: 2429
Joined: March 7th, 2003, 7:10 pm

Motivation is what? If I understand you correct, spare time is consequence of motivation
shternlib
Active Member

Posts: 5
Joined: June 28th, 2004, 7:34 am
Location: Russia

Currently I have three open projects in my hands. When I finished them, I may improve TGraphLink class to fit in your needs.

Kambiz

Posts: 2429
Joined: March 7th, 2003, 7:10 pm

Does anything can change the priority of your projects? I mean making TSimpleGraph before those three projects
shternlib
Active Member

Posts: 5
Joined: June 28th, 2004, 7:34 am
Location: Russia

Two of them are contracted projects and I cannot postpone them.

Kambiz