How can I convert a string of formula to an image

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I want to convert a string of formula (such as a/b+c* sqrt d)to an image
Like what the following webpage does.

http://www.wolframalpha.com/input/?i=3%2F2%2B%285*%286%2F%284%2F%283%2F%282%2F1%29%29%29%29%29%2F4[^]

somebody provide an example or sth? thanks

(Is this a clear description?why no replys???)

Posted 12-Aug-12 3:15am

ChineseGuy

Updated 12-Aug-12 3:53am

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[no name] 12-Aug-12 9:21am

So create a bitmap and draw the text on it. What are you having trouble with?

ChineseGuy 12-Aug-12 9:58am

there are many factors to consider which makes me confused about draw from where
And the size of the number，sqrt，Fractional line depends how many numbers or something else are included................

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Richard MacCutchan · Accepted Answer · 2012-08-12T04:27:00

Converting anything in this way requires a little thinking in advance. You need to analyse the information you are converting and figure out how high and wide it might be. For example, showing a division operation such as:

    23
a = --
    10

requires first, two 'lines', each of which needs to be high enough to contain characters in the selected font. Secondly a 'line' high enough to contain a separator. The start of the expression "a = " should be positioned centred on the dividing line. The actual calculations would be based on the size of the image you wish to display and the size of the font being used for the characters, so assuming a font 10 px high by 8 px wide we would have something like:

moveto(32, 0) // position X, Y
write("23")
moveto(0, 6)
write("a = ")
moveto(32, 12)
lineto(48, 12)
moveto(32, 14)
write("10")