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shternlib
Member
Joined: 28 Jun 2004
Posts: 5
Location: Russia
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 Posted: 28/06/04 07:38 Post subject: Future of SimpleGraph |
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| Hi. Where can I know about your feature plans of TSimpleGraph? Do you plan to make polylines? Thanks.
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Kambiz
Administrator
Joined: 07 Mar 2003
Posts: 386
Location: Tehran, Iran
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| Posted: 28/06/04 09:24 Post subject: |
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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: | 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: | | TSimpleGraph.Register(TTriangularNode); |
That's all.
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shternlib
Member
Joined: 28 Jun 2004
Posts: 5
Location: Russia
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| Posted: 28/06/04 10:43 Post subject: I mean polyline link |
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Is it possible to make polyline link? F.e. link from node A to node B and another link from B to A?
| Description: |
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Kambiz
Administrator
Joined: 07 Mar 2003
Posts: 386
Location: Tehran, Iran
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| Posted: 28/06/04 11:56 Post subject: |
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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.
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shternlib
Member
Joined: 28 Jun 2004
Posts: 5
Location: Russia
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| Posted: 28/06/04 13:53 Post subject: :D |
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| And what is needed to make this moment closure?
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Kambiz
Administrator
Joined: 07 Mar 2003
Posts: 386
Location: Tehran, Iran
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| Posted: 28/06/04 14:00 Post subject: |
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| (Motivation + Spare Time) . (a lot)
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shternlib
Member
Joined: 28 Jun 2004
Posts: 5
Location: Russia
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| Posted: 28/06/04 14:03 Post subject: |
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Motivation is what?  If I understand you correct, spare time is consequence of motivation
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Kambiz
Administrator
Joined: 07 Mar 2003
Posts: 386
Location: Tehran, Iran
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| Posted: 28/06/04 14:33 Post subject: |
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| Currently I have three open projects in my hands. When I finished them, I may improve TGraphLink class to fit in your needs.
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shternlib
Member
Joined: 28 Jun 2004
Posts: 5
Location: Russia
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| Posted: 28/06/04 14:40 Post subject: |
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Does anything can change the priority of your projects? I mean making TSimpleGraph before those three projects 
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Kambiz
Administrator
Joined: 07 Mar 2003
Posts: 386
Location: Tehran, Iran
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| Posted: 28/06/04 16:04 Post subject: |
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| Two of them are contracted projects and I cannot postpone them.
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