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From "Richard Liang" <richard.lian...@gmail.com>
Subject Re: [classlib][awt] Fonts with negative size.
Date Sat, 23 Sep 2006 08:42:17 GMT
On 9/22/06, Ilya Okomin <ilya.okomin@gmail.com> wrote:
> Hi, all!
>
> I was playing with fonts and found that Font with negative size can be
> created on RI.
>  Unfortunately spec keep silence about fonts with negative sizes.
> On Harmony if font size is negative then it is set to zero.
>
> ------------test.java---------------
> import java.awt.*;
> import java.awt.font.FontRenderContext;
>
> public class NegativeFontTest {
>
>     public static void main(String[] args) {
>         int fontsize=-5;
>         Font localFont = new Font("Arial", 2, fontsize);
>         System.out.println("Size = " + localFont.getSize2D());
>
>         System.out.println("Height = " + localFont.getLineMetrics("", new
> FontRenderContext(null, false, false)).getHeight());
>         System.out.println("MaxCharBounds = " + localFont.getMaxCharBounds(new
> FontRenderContext(null, false, false)));
>     }
>
> }
> ----------------------------------------
> If you run this test case on RI you can see that output looks quite strange:
>
> Size = -5.0
> Height = -5.7495117
> MaxCharBounds = java.awt.geom.Rectangle2D$Float[x=0.0,y=4.6081543,w=-5.46875
> ,h=-5.7495117]
>
>
> Actually, I dont see any sence in negative height and width metrics and
> I think it is an RI bug.
> If you try to draw text with such font on RI - nothing is happen, you can't
> see any text on the component.
> I've ran 'xfontsel' tool on Linux and there was suggested to choose only
> positive sized fonts. Also I've looked on the GDI LOGFONT structure
> description in MSDN and I've seen there again that we deal with absolute
> height values.
>
> Any thoughts on this issue, is it RI bug or not?

We cannot say it's a bug of RI, because the spec does not explicitly
describe the requirement of font size.

I suggest we follow RI.

Best regards,
Richard

>
> Thanks,
> Ilya.
>
> --
> --
> Ilya Okomin
> Intel Middleware Products Division
>
>


-- 
Richard Liang
China Development Lab, IBM

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