FontMetrics.getStringBounds for AttributedString gives wrong result?

Question

As shown in the following picture, an AttributedString is drawn on a JPanel (500X500).

The FontMetrics.getStringBounds() of that AttributedString gives a

Answer 1

The FontMetrics only receives a CharacterIterator, and does not take into account that it is actually an AttributedCharacterIterator. You can use a TextMeasurer to compute the actual bounds of your string. For comparison, add this after you called the drawString method:

    // Compensate for the 50,50 of the drawString position
    g.translate(50, 50);

    g.setColor(Color.RED);
    Rectangle2D wrongBounds = fm.getStringBounds(
            text.getIterator(), 0, text.getIterator().getEndIndex(), g);
    g.draw(wrongBounds);
    System.out.println("wrong: "+wrongBounds);

    g.setColor(Color.BLUE);
    AttributedCharacterIterator iterator = text.getIterator();
    TextMeasurer tm = new TextMeasurer(iterator, g.getFontRenderContext());
    Rectangle2D rightBounds = tm.getLayout(0, iterator.getEndIndex()).getBounds();
    g.draw(rightBounds);
    System.out.println("right: "+rightBounds);

(And BTW: Don't call g.dispose() on the Graphics that was handed to you in the paintComponent method)