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List:       poi-user
Subject:    Re: Tools for calculating coordinates for HSSFClientAnchors
From:       Matt Robinson <matt.robinson () cellnet ! com ! au>
Date:       2009-01-30 4:50:20
Message-ID: OF35214242.1F72E85B-ON4A25754E.001A4971-4A25754E.001A9596 () cellnet ! com ! au
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Thank you Yegor.  It certainly helped, but as my default font is Helvetica 
Neue, it made the far too big.

I'll play around a little more.

Kind Regards,
Matt.




Yegor Kozlov <yegor@dinom.ru> 
29/01/2009 05:37 PM
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Re: Tools for calculating coordinates for HSSFClientAnchors






You can use HSSFPicture.resize() to set the original size of an image. If 
topLeftX, topLeftY are set, 
HSSFPicture.resize() sets the new anchor relative to them.

See the source code
http://svn.apache.org/repos/asf/poi/trunk/src/java/org/apache/poi/hssf/usermodel/HSSFPicture.java



Excel uses the coordinate system based on column-row grid, not on pixels. 
The conversion from column-row based 
coordinates into pixels is indeed tricky. The main difficulty is that 
Excel measures columns in units of 1/256th of a 
character width. That is, to set the original width of an image you need 
to calculate how many characters of the default 
font will occupy the image width.

Current implementation of HSSFPicture.resize() is based on empirical 
constants found for Arial 10pt, the default font in 
most cases.

Yegor

> Hello All,
> 
> Can someone please help me with a method or tool that allows me to 
convert 
> column width and row height settings into meaningful coordinate settings 

> for the HSSFClientAnchor class so I may insert an image into my 
> spreadsheet at full size?  The documentation doesn't specify the units 
of 
> these coordinates, and they don't seem to correlate to pixels or any 
other 
> units denoted in the documentation.
> 
> For example:
> 
> The constructor call is:
> HSSFClientAnchor imageAnchor = new HSSFClientAnchor( topLeftX, topLeftY, 

> bottomRightX, bottomRightY, startColumn, startRow, endColumn, endRow );
> 
> I have an image with width 308px and height 62px.
> 
> I would like to calculate the appropriate settings for bottomRightX, and 

> bottomRight based in these pixel sizes (and the origin values in 
topLeftX 
> and topLeftY).
> 
> After fiddling around with the values (and examining the errors thrown 
> when I exceeded the cell boundaries), I came up with:
> 550, 0, 1023, 255
> 
> This seemed to be the closest I could get to the image size, but it 
still 
> isn't full size.  This suggests that 62px translates roughly to 255 and 
> 308px translates to 473 (1023 - 550)?
> 
> I'm sure I've missed something fundamental.
> 
> Matt Robinson
> 
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