Extract font width using FOP

[cdellasanta]

Hi all,

I'm trying to auto size a font to not exceed the block dimensions, giving a
default max size and downgrading to predefined steps until it fits or a
minimum size is reached.

I can't use the SVG "trick" because I want to fit to a max defined width,
and and as the size is reduced more text will fit in a single line.

My idea is to build an external processor step that calculates the optimum
font size to be used for the block. But to do this I need the exact font
width (in millipoints) of each character (or word) of the selected font
triplet on each font size I intend to use.

Browsing the fop project  source I've found the
org.apache.fop.fonts.Font.getCharWidth(), but It's for me a bit tricky to
instantiate correctly this Class.

I assume the the best way to get this is to start from the
org.apache.fop.tools.fontlist.FontListMain that does already the fop
configuration and loading of the font. But as a xsl-fo end-user, I've no
knowledge on the fop internals (structure/architecture) to go from A to B.

Can you please give me some hints or practical examples?
Wold it make sense to extend the org.apache.fop.tools to provide this
functionality?
Or am I on the wrong way?

Thanks in advance for any hint or feedback you can provide.

Regards.

p.s. I'm generating documents using a custom font, that I've imported using
org.apache.fop.fonts.apps.TTFReader and imported using the specific
configuration file.




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Re: Extract font width using FOP

[Bonekrusher]

You can right an extension in Java and use Font Metrics... I wrote this a
while back, so it might need to be updated. This example will return the
width of a String.


import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Toolkit;

public class StringLength {


public static void main(String[] args) throws NumberFormatException {

if(args.length < 2){
System.out.println("StringLength  ");
System.exit(0);
}else{
getStringLength(args[0], Integer.parseInt(args[1]));

}  

}

@SuppressWarnings("deprecation")
public static int getStringLength(String str, int size){

Toolkit toolkit =  Toolkit.getDefaultToolkit();
int stringlen = 0;  
Font font = new Font("Arial", Font.PLAIN, 9);   
FontMetrics fontMetrics = toolkit.getFontMetrics(font);
System.out.println ("[Stylesheet Info] Calculating width for: " 
+ str + ":
"  + fontMetrics.stringWidth(str));
stringlen = fontMetrics.stringWidth(str);   
return stringlen;
}


}




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Re: Extract font width using FOP

[Glenn Adams]

except that (in general) FOP does not use AWT to obtain font metrics

On Fri, Nov 16, 2012 at 4:29 PM, Bonekrusher  wrote:

> You can right an extension in Java and use Font Metrics... I wrote this a
> while back, so it might need to be updated. This example will return the
> width of a String.
>
>
> import java.awt.Font;
> import java.awt.FontMetrics;
> import java.awt.Toolkit;
>
> public class StringLength {
>
>
> public static void main(String[] args) throws
> NumberFormatException {
>
> if(args.length < 2){
> System.out.println("StringLength   font size>");
> System.exit(0);
> }else{
> getStringLength(args[0],
> Integer.parseInt(args[1]));
> }
>
> }
>
> @SuppressWarnings("deprecation")
> public static int getStringLength(String str, int size){
>
> Toolkit toolkit =  Toolkit.getDefaultToolkit();
> int stringlen = 0;
> Font font = new Font("Arial", Font.PLAIN, 9);
> FontMetrics fontMetrics = toolkit.getFontMetrics(font);
> System.out.println ("[Stylesheet Info] Calculating width
> for: " + str + ":
> "  + fontMetrics.stringWidth(str));
> stringlen = fontMetrics.stringWidth(str);
> return stringlen;
> }
>
>
> }
>
>
>
>
> --
> View this message in context:
> http://apache-fop.1065347.n5.nabble.com/Extract-font-width-using-FOP-tp37360p37361.html
> Sent from the FOP - Users mailing list archive at Nabble.com.
>
> -
> To unsubscribe, e-mail: fop-users-unsubscr...@xmlgraphics.apache.org
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>
>