java.awt.font 字母间距

Question

使用 java.awt.font 时是否可以增加字母间距？ 像这样的：

Font font = new Font("serif", Font.PLAIN, 21);
//Increase the spacing - perhaps with deriveFont()?

BufferedImage image = new BufferedImage(400, 600, BufferedImage.TYPE_INT_RGB);
Graphics2D graphics = image.createGraphics();
graphics.setFont(font);
graphics.drawString("testing",0,0);

Answer 1

您可以使用更新的跟踪属性派生新字体：

Map<TextAttribute, Object> attributes = new HashMap<TextAttribute, Object>();
attributes.put(TextAttribute.TRACKING, 0.5);
Font font2 = font.deriveFont(attributes);
gr.setFont(font2);
gr.drawString("testing",0,20);

Answer 2

一个通用的“在宽度为 w 的容器中以当前字体居中此文本”可能是：

    /**
     * Calculates the x-coordinate to use to center the specified message
     * horizontally during a subsequent call to g.drawString().
     * 
     * @param g       - the instance of the Graphics object to use.
     * @param message - the string containing the message to be centered.
     * @param width   - the width of the container to center the message in.
     * @return - the integer x-coordinate to use in a subsequent call to
     *             g.drawString()
     */
    private int centerMessageHorizontal(Graphics g, String message, int width)
    {
        FontMetrics fontMetrics = g.getFontMetrics();
        int textWidth = fontMetrics.stringWidth(message);
        return width / 2 - textWidth / 2;
    }