Java AWT LineBreakMeasurer measure multiple lines of text
import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.RenderingHints; import java.awt.font.FontRenderContext; import java.awt.font.LineBreakMeasurer; import java.awt.font.TextAttribute; import java.awt.font.TextLayout; import java.text.AttributedCharacterIterator; import java.text.AttributedString; import java.util.Random; import javax.swing.JFrame; import javax.swing.JPanel; public class Main extends JPanel { Random rnd = new Random(); @Override//from www. j a v a 2s.co m public void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2d = (Graphics2D) g; g2d.setBackground(Color.WHITE); g2d.clearRect(0, 0, getParent().getWidth(), getParent().getHeight()); // antialising g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); // Serif bold Font serif = new Font("Serif", Font.BOLD, 22); g2d.setFont(serif); String latinText = "Lorem ipsum dolor sit amet, consectetur " + "adipiscing elit, sed do eiusmod tempor incididunt ut " + "labore et dolore magna aliqua. Ut enim ad minim veniam, " + "quis nostrud exercitation ullamco laboris nisi ut aliquip " + "ex ea commodo consequat. Duis aute irure dolor in " + "reprehenderit in voluptate velit esse cillum dolore eu " + "fugiat nulla pariatur. Excepteur sint occaecat cupidatat " + "non proident, sunt in culpa qui officia deserunt mollit " + "anim id est laborum."; AttributedString attrStr = new AttributedString(latinText); attrStr.addAttribute(TextAttribute.FONT, serif); AttributedCharacterIterator attrCharIter = attrStr.getIterator(); FontRenderContext fontRenderCtx = g2d.getFontRenderContext(); LineBreakMeasurer lineBreakMeasurer = new LineBreakMeasurer(attrCharIter, fontRenderCtx); float wrapWidth = getParent().getWidth(); float x = 0; float y = 0; while (lineBreakMeasurer.getPosition() < attrCharIter.getEndIndex()) { TextLayout textLayout = lineBreakMeasurer.nextLayout(wrapWidth); y += textLayout.getAscent(); textLayout.draw(g2d, x, y); y += textLayout.getDescent() + textLayout.getLeading(); } } public static void main(String[] args) { // create frame for Main JFrame frame = new JFrame("java2s.com"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Main Main = new Main(); frame.add(Main); frame.setSize(300, 210); frame.setVisible(true); } }