问题
Is there a way to calculate the length of a string in pixels, given a certain java.awt.Font
object, that does not use any GUI components?
回答1:
that does not use any GUI components?
It depends on what you mean here. I'm assuming you mean you want to do it without receiving a HeadlessException
.
The best way is with a BufferedImage
. AFAIK, this won't throw a HeadlessException
:
Font font = ... ;
BufferedImage img = new BufferedImage(1, 1, BufferedImage.TYPE_INT_ARGB);
FontMetrics fm = img.getGraphics().getFontMetrics(font);
int width = fm.stringWidth("Your string");
Other than using something like this, I don't think you can. You need a graphics context in order to create a FontMetrics
and give you font size information.
回答2:
You can use the Graphics2D
object to get the font bounds (including the width):
Graphics2D g2d = ...
Font font = ...
Rectangle2D f = font.getStringBounds("hello world!", g2d.getFontRenderContext());
But that depends on how you will get the Graphics2D
object (for example from an Image
).
回答3:
This gives the output of (137.0, 15.09375) for me. I have no idea what the units are, but it certainly looks proportionally correct and doesn't use Graphics2D directly.
Font f = new Font("Ariel", Font.PLAIN, 12);
Rectangle2D r = f.getStringBounds("Hello World! Hello World!", new FontRenderContext(null, RenderingHints.VALUE_TEXT_ANTIALIAS_DEFAULT, RenderingHints.VALUE_FRACTIONALMETRICS_DEFAULT));
System.out.println("(" + r.getWidth() + ", " + r.getHeight() + ")");
来源:https://stackoverflow.com/questions/13345712/string-length-in-pixels-in-java