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How to calculate width of a String in pixels in Java? For e.g., I have a string say "Hello World!". What is its length in pixels, also considering its font family and size?

mKorbel
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user2550754
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  • Well, do you have a special font and font size in mind? – Matthias Aug 20 '13 at 05:52
  • It can be arbitrarily anyone. – user2550754 Aug 20 '13 at 05:53
  • Edited your formatting to remove the code markup for length in particular. – s.bandara Aug 20 '13 at 05:54
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    Start by taking a look at [Drawing Mutliple Lines of Text](http://docs.oracle.com/javase/tutorial/2d/text/drawmulstring.html) and [`FontMetrics#stringWidth`](http://docs.oracle.com/javase/7/docs/api/java/awt/FontMetrics.html) – MadProgrammer Aug 20 '13 at 05:55
  • Are you asking anything different from [this](http://stackoverflow.com/questions/258486/calculate-the-display-width-of-a-string-in-java)? – devnull Aug 20 '13 at 05:59
  • [This](http://stackoverflow.com/questions/13345712/string-length-in-pixels-in-java) might also answer your question. – devnull Aug 20 '13 at 06:01

5 Answers5

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In short: the question depends on the framework you are using. For example, if you are using AWT, and have a Graphics object graphics, and a Font object font you can do the following:

FontMetrics metrics = graphics.getFontMetrics(font);
int width = metrics.stringWidth("Hello world!");

Check out this for more information.

nickolayratchev
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You can try something like this

Graphics2D g2d = ...
Font font = ...
Rectangle2D r = font.getStringBounds("hello world!", g2d.getFontRenderContext());
System.out.println("(" + r.getWidth() + ", " + r.getHeight() + ")");

Refer this doc, may help you.

Ruchira Gayan Ranaweera
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  • It seems a little convaluted considering you can use `Graphics#getFontMetrics`, but I'll give you an up vote for being different ;) – MadProgrammer Aug 20 '13 at 06:05
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There are a number of ways to achieve what you want, based on what it is you want to achieve, for example...

BufferedImage img = new BufferedImage(1, 1, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = img.createGraphics();
FontMetrics fm = g2d.getFontMetrics();
System.out.println(fm.stringWidth("This is a simple test"));
g2d.dispose();

But this only has relevence for the BufferedImage and it's Graphics context, it will not translate back to say, something like a screen or printer.

However, so long as you have a Graphics context, you can achieve the same result.

This example, obviously, uses the default font installed for the Graphics context, which you can change if you need to...

MadProgrammer
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  • I just have a `String`. I know its length, font family, font size. I want to calculate its size in pixels. – user2550754 Aug 20 '13 at 06:02
  • Fine, then you can use something like the above. The width and height is depended on the `Graphics` context you are rendering to. While you have the font family, font size and text, you are missing the key element – MadProgrammer Aug 20 '13 at 06:03
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there are couple of ways to do it, you can try label.getElement().getClientWidth(); if the text is in a lable, if you're using AWT you can use Graphics.getFontMetrics then FontMetrics.stringWidth

Labib Ismaiel
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You can use FontMetrics. The FontMetrics class defines a font metrics object, which encapsulates information about the rendering of a particular font on a particular screen.

You can do something like below

    Font font = new Font("Verdana", Font.PLAIN, 10);  
    FontMetrics metrics = new FontMetrics(font) {  
    };  
    Rectangle2D bounds = metrics.getStringBounds("Hello World!", null);  
    int widthInPixels = (int) bounds.getWidth();
Aniket Thakur
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  • I've got a pretty good feeling that this isn't going to work. The pixel size will be depended on the `Graphics` context, which you're passing `null` for... – MadProgrammer Aug 20 '13 at 06:06
  • Not sure how to cross verify the result but when I ran it I got 67 as the output for the string Hello World!. – Aniket Thakur Aug 20 '13 at 06:08