Trouble returning text height

[HxRLxY]

I am trying to create custom buttons for an application. I have created a class that extends JButton and overridden the paintComponent() method. My problem is that I cannot find a way to return the pixel height of the text that will be put on the button, and therefore I am not able to center the text vertically within the button. I have tried something like this:

GlyphVector gv = myFont.createGlyphVector (g2d.getFontRenderContext(), string);
double height = gv.getLogicalBounds().getHeight();
 
textLocationY = (myButton.getHeight() + height) / 2;
g2d.drawString (string, textLocationX, textLocationY);
 

I have also tried using FontMetric and calling getHeight, getAscent, getMaxAscent, etc... I can get the text almost centered, but it is still visibly off. I can center the text by hard-coding a couple of extra pixels, but that doesn't hold when the button is resized, or if I change the font size, and it's just bad programming practice. Any help would be greatly appreciated.

[JosAH]

Get the ascent from the LineMetrics object given a piece of text using a Font (read the API documentation of the Font class). Note that long ascenders (e.g. h, k, l and the capital letters) cause the entire text to be visually positioned a bit lower than you expected because the majority of the pixels will be positioned below the average height. If you want to correct that you really have to do quite some ugly calculations.

kind regards,

Jos

[HxRLxY]

I found that using TextLayout and calling getBounds returns a fairly accurate bounding rectangle. Thank you for the help.

[JosAH]

@HxRLxY
Yes, a TextLayout object uses a LineMetrics object to do the dirty work.

kind regards,

Jos