Re: Problem with Rasterize[] on Strings
- To: mathgroup at smc.vnet.net
- Subject: [mg95139] Re: Problem with Rasterize[] on Strings
- From: dh <dh at metrohm.com>
- Date: Wed, 7 Jan 2009 04:13:43 -0500 (EST)
- References: <gjsgbg$k2s$1@smc.vnet.net>
Hi Nathan,
mathematica does not know the size of the picture you want. From the manula:
"If no explicit size or resolution option settings are given,
Rasterize[g,\[Ellipsis]] will rasterize g at the size and resolution it
would normally be displayed in a notebook."
If you specify the ImageSize no wrapping will happen. E.g:
s2 = Style["A medium length string", FontSize -> 100,
FontFamily -> "Times"];
Rasterize[s2, ImageResolution -> 300, ImageSize -> {800, 100}]
hope this helps, Daniel
Nathan Myhrvold wrote:
> I am trying to use Rasterize[] on strings, and I am running into some
> strange behavior.
>
> This line works fine
>
> s1 = Style["A medium length string", FontSize-> 10, FontFamily ->
> "Times"];
>
> Rasterize[s1, ImageResolution -> 100]
>
> However, as I increase either the font size, or the image resolution,
> the text will wrap into two or more lines:
>
> s2 = Style["A medium length string", FontSize-> 100, FontFamily ->
> "Times"];
>
> Rasterize[s2, ImageResolution -> 300]
>
> The strange thing is that this depends on the window size! If you make
> the window very narrow (or have a low resolution screen) then it will
> start wrapping sooner that it will with. So depending on your monitor
> and graphics card, and what size window you use, you can find a
> combination that will wrap.
>
> So if I stretch a Mathematica window across my dual-monitor set up, I
> can take the string s2 up to ImageResolution-> 192 before it wraps.
> With a small window it wraps at ImageResolution-> 90.
>
> I think what is going on here is that the Mathematica front end is doing
> the rasterizing and it first lays out the string for the window. If
> it needs to wrap, then it formats the string into two lines before it
> rasterizes. The weird part is that the decision to format depends on
> the resolution even though the display does not.
>
> So, even if s2 above displays correctly, and even if the result of
> Rasterize[s2,ImageResolution->300] is displayed correctly (at 100 point
> font size) the intermediate calculation of whether there is enough space
> to rasterize somehow is done depending on window size. I think this is
> a rather serious bug, because it defeats the purpose of using
> ImageResolution higher than screen resolution. Note that the same
> occurs for RasterSize->num when num is bigger than your window, it
> wraps.
>
> My question is this - how can I avoid this word wrapping? There must be
> some way to do this!
>
> One approach I have tried is to use Graphics inside Rasterize, i.e.
>
> Rasterize[Graphics[Text[s2,{0,0},{-1,0}],ImageSize->{All, 200}] ,
> ImageResolution -> 300]
>
> This has a couple problems:
>
> - I get lots of padding on both sides of the text. I can't seem
> to control it with ImagePadding-> 0, PlotRangePadding-> 0
>
> - Yet if I don't make ImageSize very large, I have my string cut
> off.
>
> Perhaps I am not making the right incantations to Graphics[] to get this
> to work properly.
>
> Here is an additional question. I am using Rasterize because I need to
> send documents to computers that don't have the same fonts I have.
> Normally I would use a PDF file. However Mathematica does not seem to
> support the font embedding feature of PDF files. If there was a way to
> enable font embedding do that I wouldn't need to Rasterize the text.
>
> Nathan
>
> This message and any attachments, may contain confidential and/or
> legally privileged information. If you are not the intended recipient
> of the message by the original sender, please destroy it. Message and
> attachments copyright (c) 2008, all rights reserved. Any unauthorized
> dissemination, distribution or copying is strictly forbidden
>