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Calculate minimal width of text in shape [message #698875]

Wed, 20 July 2011 08:14

Eclipse User

Hello,

My context: I create a shape with an icon and (multi-)text in the AddFeature and I want to set the width of the shape according to the length of the text. Is there already a Graphiti function for doing that?

My current approach is to multiply the text length with a certain factor but this works out not very well. I found another approch by using FontMetrics in another Eclipse forum post, but do not know how to get a drawable from a Graphiti shape.

GC gc = new GC(drawable);
FontMetrics fontMetrics = gc.getFontMetrics();
gc.dispose();
int width = fontMetrics.getAverageCharWidth() * text.toCharArray().length;

Joerg

Re: Calculate minimal width of text in shape [message #698888 is a reply to message #698875]

Wed, 20 July 2011 08:33

Eclipse User

Good question. I tried to find something for this as well and could not find it either. Also see this thread: http://www.eclipse.org/forums/index.php/m/651158/?srch=text+graphiti#msg_651158

Jos

Re: Calculate minimal width of text in shape [message #698898 is a reply to message #698888]

Wed, 20 July 2011 08:40

Eclipse User

Hi Jos,

with new Shell() the code seems to work.

GC gc = new GC(new Shell());
FontMetrics fontMetrics = gc.getFontMetrics();
gc.dispose();
int width = fontMetrics.getAverageCharWidth() * ((text != null) ? text.toCharArray().length : 0);

This was inspired by:
http://www.eclipse.org/forums/index.php/mv/msg/164898/522303/#msg_522303

There is also a FigureUtilities.getTextExtents but this requires a org.eclipse.swt.graphics.Font to pass
http://www.eclipse.org/forums/index.php/mv/msg/3735/11116/#msg_11116

Joerg

Re: Calculate minimal width of text in shape [message #699346 is a reply to message #698898]

Thu, 21 July 2011 07:54

Eclipse User

Graphiti provides the UI layout service for doing this
(GraphitiUi.getUiLayoutService().calculateTextSize(String text, Font font)).
As you see it also requires the font (and in the end delegates to draw2D
TextUtilities), but for knowing the correct extend of a text it is important
to know the font because characters might have different widths in different
fonts.

The thread Jos found is a different issue.

HTH,
Michael

"Joerg Reichert" schrieb im Newsbeitrag
news:j06hpp$eli$1@news.eclipse.org...

Hi Jos,

with new Shell() the code seems to work.

GC gc = new GC(new Shell());
FontMetrics fontMetrics = gc.getFontMetrics();
gc.dispose();
int width = fontMetrics.getAverageCharWidth() * ((text != null) ?
text.toCharArray().length : 0);

This was inspired by:
http://www.eclipse.org/forums/index.php/mv/msg/164898/522303/#msg_522303

There is also a FigureUtilities.getTextExtents but this requires a
org.eclipse.swt.graphics.Font to pass
http://www.eclipse.org/forums/index.php/mv/msg/3735/11116/#msg_11116

Joerg
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Re: Calculate minimal width of text in shape [message #699357 is a reply to message #699346]

Thu, 21 July 2011 08:28

Eclipse User

Hi Michael,

sure you need the concrete font properties to calculate the size.
Thanks for pointing to GraphitiUi.getUiLayoutService().calculateTextSize

There are two overloading methods one taking a org.eclipse.graphiti.mm.algorithms.styles.Font
and one taking a org.eclipse.swt.graphics.Font, so it fits will.

Regards
Joerg

[Updated on: Thu, 21 July 2011 09:04] by Moderator

Re: Calculate minimal width of text in shape [message #699385 is a reply to message #699357]

Thu, 21 July 2011 09:08

Eclipse User

Really, are you sure?

I see org.eclipse.graphiti.mm.algorithms.styles.Font for both the return
value of AbstractText.getFont and the Parameter font in
IUiLayoutService.calculateTextSize.

Michael

"Joerg Reichert" schrieb im Newsbeitrag
news:j095ed$v6m$1@news.eclipse.org...

Hi Michael,

sure you need the concrete font properties to calculate the size.
Thanks for pointing to GraphitiUi.getUiLayoutService().calculateTextSize

But org.eclipse.graphiti.mm.algorithms.AbstractText#getFont returns
org.eclipse.graphiti.mm.algorithms.styles.Font the method above needs
org.eclipse.swt.graphics.Font. SO you have to convert the Graphiti font
to a SWT font first

org.eclipse.graphiti.ui.internal.util.DataTypeTransformation.toSwtFont(Font
pictogramFont)

When searching for references where this method is used, I found this method

org.eclipse.graphiti.ui.internal.services.impl.GefService.calculateTextSize(String
text, Font font)

that takes a org.eclipse.graphiti.mm.algorithms.styles.Font. So will use
this method instead (although it is in a internal package).

Regards
Joerg
--
--
Need professional support for Xtext and EMF?
Go to: http://xtext.itemis.com

Re: Calculate minimal width of text in shape [message #699392 is a reply to message #699385]

Thu, 21 July 2011 09:35

Eclipse User

oh, sorry I mixed it up in the Eclipse search result view. There is only one method for org.eclipse.graphiti.mm.algorithms.styles.Font.

Joerg

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