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  1. JDK
  2. JDK-8205046

Calling Graphics2D.rotate(...) modifies FontMetrics

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    • Subcomponent:
      2d

      Description

      See test below - the issue occurs with Java 11 EA17 on Windows OS. The font metrics object is modified by calling g2.rotate(...).

      Test-----------------------------

      import java.awt.FlowLayout;
      import java.awt.FontMetrics;
      import java.awt.Graphics;
      import java.awt.Graphics2D;
      import java.awt.Rectangle;

      import javax.swing.JFrame;
      import javax.swing.JLabel;
      import javax.swing.SwingUtilities;

      public class RotationTest extends JFrame{
        public static void main(String[] args){
          SwingUtilities.invokeLater(() -> new RotationTest());
        }

        public RotationTest(){
          setLayout(new FlowLayout());
          JLabel l = new JLabel("123") {
            @Override
            protected void paintComponent(Graphics g)
            {
              Rectangle textRect = new Rectangle();
              textRect.setBounds(0, 0, getWidth(), getHeight());
              Graphics2D g2 = (Graphics2D)g;
              
              double origin = (textRect.width-textRect.height)/2;
              g2.translate(origin, origin);
              FontMetrics fm1 = g.getFontMetrics();
              g2.rotate(Math.toRadians(90), textRect.x+textRect.width/2, textRect.y+textRect.height/2);
              FontMetrics fm2 = g.getFontMetrics();
              assert fm1.getAscent() == fm2.getAscent();
              super.paintComponent(g2);
              g2.rotate(-Math.toRadians(90), textRect.x+textRect.width/2, textRect.y+textRect.height/2);
              g2.translate(-origin, -origin);
            }
          };
          add(l);

          setTitle(this.getClass().getSimpleName());
          setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          setSize(400, 300);
          setLocationRelativeTo(null);
          setVisible(true);
        }
      }

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              • Assignee:
                prr Philip Race
                Reporter:
                wzberger Wolfgang Zitzelsberger
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                • Created:
                  Updated:
                  Resolved: