SimpleGraph 2.6 released!

kokkoras · Posted: 31/03/06 20:00 Post subject:

This may sound biased but I think that it would be nice to be able to size the group bounding box. Use the union of the inner bounding boxes as the default bounding box for the group, but allow the programmer to resize it by code.

Thinking it again, I believe that the group should be just like a rectangleNode with the extra property of a list that holds the inner objects. The group should be paint before the inner objects and should get priority on the mouse clicks. This approach allows the group to also have a label, its own color and/or background image, margins, etc. etc. It would be also easy to drag'n'drop nodes inside the group.

I guess you agree with the functionality but I am not sure on the coding requirements to implement it.

What do you think?

EDIT: Idea

What about adding groups inside a group? Maybe you should consider the current graphNode as the groupNode (that is, provide it with the ability to hold possible clild objects, even other groups). Then..... Question

Well, it's bloody complex Confused

. We need well defined specs before putting the hands on it.

Kambiz · Posted: 31/03/06 20:42 Post subject:

It's a long time you are looking for a container node, I know. Smile

My implementation of group, is a group not a container. If you want to draw something as the background of the group, you can:

Subclass TGraphGroup and override its Draw method.
Use OnObjectBeforeDraw event and paint background of the group.
Add a non-selectable node as the first member, and restrict bounding rectangle of other members to bouding rectangle of the node. Actually, there's no need to apply any restriction. It's because user cannot move or resize individual objects.

As I already mentioned in my previous post, user (and program) can move/ resize the group. In addition, size and position of each member can be changed by code.

kokkoras · Posted: 31/03/06 20:57 Post subject:

U R the boss. Groups are fine and contribute to my plans. Very Happy

What is the time there?

edit: I heard on the news about an earthquake there. It also shakes frequently here in Greece.
edit2: TContainerNode = TGroupNode + UI Laughing

Kambiz · Posted: 31/03/06 21:12 Post subject:

The new government has revoked "daylight saving" at least for this year. Rolling Eyes

Therefore, relative to Greece, if you are in daylight saving, I'm half hour ahead. Otherwise, one and half hour.

Iran is on a fault and time to time a tough Earthquake happens. Sad

kokkoras · Posted: 31/03/06 21:27 Post subject:

kokkoras · Posted: 01/04/06 18:18 Post subject:

Kambiz, will it be possible to have a group inside other group? Just curious, no request.

Kambiz · Posted: 01/04/06 22:16 Post subject:

I think I've already answered this question.

Yes, nested groups are allowed. Each group considers as a single object.

By the way, as you suggested, I added AllObjects, NodeObjects, LinkObjects, and GroupObjects properties. Objects, SelectedObjects, and DraggingObjects properties are kept untouched.

kokkoras · Posted: 01/04/06 23:47 Post subject:

kokkoras · Posted: 03/04/06 00:07 Post subject:

This is something discussed in another thread a few versions Laughing

ago.
It is about the ability to hide the labels of links (well, this could be apllied to all nodes as well). My position was the following:

1. Have a showLabel boolean property for each link (and node).
2. Have a showLabels boolean property at the simpleGraph level.

The first will enable us to display only specific lebels. The second one will allow us to teporarily switch on/off all the labels _without_ affecting the individual objects' showLabel state.

So a label for an object is displayed if:
a) object.showLabel=true
b) simpleGraph.showLabels=true

And a question about groups: do they have a label?

Kambiz · Posted: 03/04/06 15:47 Post subject:

1. goShowCaption value of TGraphObject.Options is provided for this purpose.
2. It easily can be achived by a call to ForEachObject to change Options property.
3. Each object has the Text property, but group doesn't display it.

kokkoras · Posted: 03/04/06 16:05 Post subject:

kokkoras · Posted: 13/04/06 10:04 Post subject:

Kambiz, have you consider the #2 feature above? Is it clear why this is a kernel feature? It's only a property in the lib and an IF statement with 2 conditions before drawing the label.

Let me give you an example.

Lets say I have 100 objects and 40 of them have their label visible while the rest 60 have their label hidden. So far so good. Now suppose I want to print the graph without labels. In current lib I have to set 40 objects/labels to hidden, print the graph, then bring back those 40 labels (if ever remember which they were).

In the suggested 2 level approach, you call the canvas properties, set the global flag to hidden, print, and finaly restore the global flag to visible.

Regards

Kambiz · Posted: 13/04/06 10:34 Post subject:

OK, I'll add this property.