Use a
BasicStrokeand draw it twice, thicker and thinner.
import java.awt.*;import java.awt.image.*;import java.awt.geom.*;import javax.swing.*;import javax.imageio.ImageIO;import java.io.File;class PaintThick { public static void main(String[] args) throws Exception { int size = 150; final BufferedImage bi = new BufferedImage( size,size,BufferedImage.TYPE_INT_RGB); Graphics2D g = bi.createGraphics(); double pad = 20; Line2D.Double line1 = new Line2D.Double( pad,pad,(double)(size-pad),(double)(size-pad)); int cap = BasicStroke.CAP_BUTT; int join = BasicStroke.JOIN_MITER; BasicStroke thick = new BasicStroke(15,cap,join); BasicStroke thinner = new BasicStroke(13,cap,join); g.setColor(Color.WHITE); g.fillRect(0,0,size,size); g.setColor(Color.BLACK); g.setStroke(thick); g.draw(line1); g.setColor(Color.WHITE); g.setStroke(thinner); g.draw(line1); ImageIO.write(bi,"png",new File("img.png")); SwingUtilities.invokeLater(new Runnable() { public void run() { JOptionPane.showMessageDialog( null, new JLabel(new ImageIcon(bi))); } }); }}
