how to intialize diagram scroll bar position and range

[Lan]

Hi,
V4.4.0.51 and VS.NET 2003

I used following similar code to load a diagram from a table BLOB, then set up the initial scroll bar position to (0,0). But my code does not work. How can I setup the scroll bar to (0,0)- X bar to the most left, Y bar to the most top? and the scroll bar ranges?
Thanks,

Lan

//load tree to diagram from a stream stored in BLOB field
LoadTree();
//initilize view
diagram.View.PageSettings.Landscape=true;
diagram.View.PageSettings.Bounds.Width=600
diagram.View.PageSettings.Bounds.Height=400
this.diagram.Model.Width=600
this.diagram.Model.Height=400
//set view Magnification to 100
this.diagram.View.Magnification = new System.Drawing.Size(100, 100);
// set scroll bar initial position to (0,0)
this.diagram.View.ScrollBy(0,0); // not work
this.diagram.UpdateScrollRange();
this.diagram.UpdateScrollBars();
this.diagram.View.Update();




scroolbar.zip

[J.Nagarajan]

Hi Lan,

If your intention is to set the scroll bar's initial position to origin then you can use the value property of HScrollBar and VScrollBar. Please refer to the following code snippet

this.diagram1.HScrollBar.Value=0;
this.diagram1.VScrollBar.Value=0;

I hope this will meet your requirement. Please let me know if you have any questions.

Thanks,
Nagaraj

[Lan Mo]

Hi,
Yes, the scroll bar position is OK now. How about the view position? The attached ViewPosition.jpg shows the view position is not at (0,0). This diagram is saved into BLOB field when the view position is not at (0,0) by 'Pan Tool" and loaded again from BLOB. I want it to be at (0,0) after loading from BLOB as attached
ViewPosition_OK.jpg. What property I need to set?
Thanks,

Lan

ViewPosition.zip

[Administrator]

Hi,
I forgot to attach my code for set up position:

//Loading diagram from stream stored in BLOB field
LoadTreeFromDB();

// set scroll bar and diagram view to (0,0)
this.diagram.HScrollBar.Value=0;
this.diagram.VScrollBar.Value=0;
this.diagram.View.Location=new Point(0,0); //this doesn't set view to (0,0)
this.diagram.Update();


Lan

[J.Nagarajan]

Hi Lan ,

We regret for the inconvenience caused. I have tested this issue in v.4.4.0.51. I am afraid, I was not able to reproduce this issue. I have attached my test sample.

View Position.zip

Could you please check the sample and let me know whether you are able to reproduce the issue in this sample?. It would be helpful if you provide a sample or modify the sample attached to reproduce this issue.It will help us to resolve it as early as possible.

Thanks for using Essential Diagram.

Regards,
J.Nagaraj

[Administrator]

Hi,
Thank you for help.

I modified your sample by adding "PanTool" in your menu so that you can add some sysmbol nodes then Click menu 'Pan' to drag the diagram view off the (0,0), save it to file. Open the file again to diaplay the diagram. I want the diagram view is at (0,0).

Please see the "a.edp" file saved.




Lan

[Administrator]

Hi,
I am sorry your sample diagram does not work the way I like.

I've modified your sample by adding "PanTool" in your menu so that you can add some sysmbol nodes then Click menu 'Pan' to drag the diagram view off the (0,0) position, then save it to a file such as "a.edp". Open the file "a.edp" again to diaplay the diagram. You will notice this diagram's view does not display at (0,0).
I want after the diagram has been loaded from a file 'a.edp', set the diagram view position to (0,0) by code.

Thanks,

Lan


View Position.zip

[J.Nagarajan]

Hi Lan,

Sorry for the delay in getting back to you. I was able to visualize the condition that you have mentioned here. If your intention is to set the view position of the diagram to (0,0) then you have to set the Origin property of View class to (0,0). Please refer to the following code snippet.

this.diagram1.Controller.View.Origin=new Point(0,0);
this.diagram1.HScrollBar.Value=0;
this.diagram1.VScrollBar.Value=0;

I have attached the sample that demonstrates this completely. Please refer to it and let me know if you have any questions.

Thanks,
Nagaraj

View Position.zip

[Administrator]

Thank you. It works well for me.