1130: Mainline

The following produces a rotated meter.

import java.awt.*;
import java.awt.geom.*;
import javax.swing.*;
public class Meter extends JComponent implements MeterInterface {
 String title = "Title to Be Supplied";
 int minValue, maxValue, value;
 public Meter (int x, int y) {
  minValue = x; maxValue = y; value = (y + x) / 2;
 }
 public void setValue(int v) {value = v; repaint();}
 public void setTitle(String t) {title = t; repaint();}
 public void paint(Graphics x) {
  Graphics2D g = (Graphics2D) x;
  // Obtain Dimension instance:
  Dimension d = getSize();
  // Draw:
  float meterWidth = d.width * 3 / 4;
  float meterHeight = meterWidth / 20;
  float pointerPosition
   = meterWidth * (value - minValue) / (maxValue - minValue);
  // Offset to new origin:
  pointerPosition = pointerPosition - (meterWidth / 2);
  GeneralPath path = new GeneralPath();
  path.moveTo(- meterWidth / 2, - meterHeight);
  path.lineTo(- meterWidth / 2, 0);
  path.lineTo(meterWidth / 2, 0);
  path.lineTo(meterWidth / 2, - meterHeight);
  path.moveTo(pointerPosition, 0);
  path.lineTo(pointerPosition, - meterHeight);
  AffineTransform transform = new AffineTransform();
  transform.translate(d.width / 2, d.height / 2);               
  transform.rotate(- Math.PI / 2);                              
  g.setTransform(transform);       
  g.draw(path);                                                  
  // Prepare font 
  int fontSize = d.width / 30;                           
  g.setFont(new Font("Helvetica", Font.BOLD, fontSize)); 
  // Write title: 
  FontMetrics f = g.getFontMetrics();                    
  float stringWidth = f.stringWidth(title);                
  float textXOffset = - stringWidth / 2;                         
  float textYOffset = 2 * f.getHeight();                         
  g.drawString(title, textXOffset, textYOffset);  
 } 
 public Dimension getMinimumSize() {return new Dimension(150, 100);}  
 public Dimension getPreferredSize() {return new Dimension(150, 100);}  
}