Centering Diagram in View?

[Jeff Fansler]

Is it possible to center the diagram in the view? By default the view is always in the upper left corner. So if you zoom and the entire page fits within the control, the page will be in the upper left with margins on the right and bottom. I''d like to center the page so that there are margins on each side.

Any ideas on how to do this?

[Administrator]

Hi Jeff,

As per my earlier update to your posting:

From your posting, it is not clear as to what you are trying to do. When the size of the Diagram (i.e. Model) is bigger than the page size, the View shows where each page boundary is. The origin of the View only controls which part of the model is rendered in the View. The origin is specified in logical (i.e. Model) units and it defines the logical point that is mapped to the upper-left hand corner of the View.

Here is a < arel='nofollow' href = "http://64.78.18.34/support/user/Uploads/f22239.zip">screenshot where the model size is 200 X 200 pixels. Now if you change the View''s Origin in the Form_Load to say:

this.diagram1.View.Origin = new PointF(this.diagram1.Model.Width/2, this.diagram1.Model.Height/2);

and then try running the sample.

As you can see the origin of the View only controls which part of the Model is rendered in the View so I am not sure what you are seeking to do what you say you want to center the Diagram in the View.

With this information, can you post information on what you want to do so that we can ensure that you are all set.

Regards
Arun

[Jeff Fansler]

I apologize if I posted twice, and I''m sorry I wasn''t clearer in my description. I''m still learning this tool. So far I''m very impressed.

I think I was using the wrong terms in my original post. What I really want to do is take the diagram and center it within the control bounds. Obviously, if the diagram is zoomed to a point where it is bigger than the control, then I wouldn''t center it anymore.

I used the pan tool to move the diagram to the center of the control to give the effect that I am looking for. What I''ve found is that when you pan the diagram to the center, and then use the scroll bars, the diagram jumps back to the default upper left.

I have a screen shot, but the attach file page seems to have an issue. If you''d like me to email it, let me know.

Also, please feel free to contact me if I''m still not being clear.

Thanks for your help,
-Jeff Fansler

>Hi Jeff,
>
>As per my earlier update to your posting:
>
>From your posting, it is not clear as to what you are trying to do. When the size of the Diagram (i.e. Model) is bigger than the page size, the View shows where each page boundary is. The origin of the View only controls which part of the model is rendered in the View. The origin is specified in logical (i.e. Model) units and it defines the logical point that is mapped to the upper-left hand corner of the View.
>
>Here is a < arel='nofollow' href = "http://64.78.18.34/support/user/Uploads/f22239.zip">screenshot where the model size is 200 X 200 pixels. Now if you change the View''s Origin in the Form_Load to say:
>
>this.diagram1.View.Origin = new PointF(this.diagram1.Model.Width/2, this.diagram1.Model.Height/2);
>
>and then try running the sample.
>
>As you can see the origin of the View only controls which part of the Model is rendered in the View so I am not sure what you are seeking to do what you say you want to center the Diagram in the View.
>
>With this information, can you post information on what you want to do so that we can ensure that you are all set.
>
>Regards
>Arun

[Jeff Fansler]

To get an idea of what I''m talking about... If you happen to have MS Publisher and you load a default blank document, the document will start out zoomed at around 50% and will be centered within the design area. This is what I am trying to accomplish.

[Administrator]

Hi Jeff Here is a modified version of the QuickStart sample that ships with Essential Diagram that demonstrates what you are seeking to do. You need to set the Origin property of the View. Take a look at the SetViewOrigin() method, which is also called when the Diagram is resized. This could be bundled into a method inside the View and called after the magnification changes and maybe it would be a good idea to include this as a feature of the library and I am following up with the Diagram team on this. Regards Arun

[Jeff Fansler]

Hi Arun,
Thanks for your help. This points me in the right direction. There are still a couple of problems though.

1) Try taking your sample and turn on the scroll bars. As soon as you scroll in either direction, the origin is set back to the upper left.

2) When you zoom, the origin should also be adjusted so that the page is always centered.

I''m going to work on these two problems and if I figure out a solution I will post them here. If you have any ideas on how to fix these problems please share them.

Thanks!