Java2D An Introduction and Tutorial

Description

public void paint(Graphics g) {    // Set pen parameters    g.setColor(someColor);    g.setFont(someLimitedFont);    // Draw a shape    g.drawString(...);    g.drawLine(...)    g.drawRect(...);     // outline    g.fillRect(...);     // solid    g.drawPolygon(...);  // outline    g.fillPolygon(...);  // solid    g.drawOval(...);     // outline    g.fillOval(...);     // solid    ...  }  

public void paintComponent(Graphics g) {    // Clear off-screen bitmap    super.paintComponent(g);    // Cast Graphics to Graphics2D    Graphics2D g2d = (Graphics2D)g;    // Set pen parameters    g2d.setPaint(fillColorOrPattern);    g2d.setStroke(penThicknessOrPattern);    g2d.setComposite(someAlphaComposite);    g2d.setFont(anyFont);    g2d.translate(...);    g2d.rotate(...);    g2d.scale(...);    g2d.shear(...);    g2d.setTransform(someAffineTransform);    // Allocate a shape     SomeShape s = new SomeShape(...);    // Draw shape    g2d.draw(s);  // outline    g2d.fill(s);  // solid  }  

1.2 Main New Features

  
• Colors and patterns: gradient fills, fill patterns from tiled images, transparency   
• Local fonts   
• Pen thicknesses, dashing patterns, and segment connection styles   
• Coordinate transformations

1.3 General Approach

  
• Cast the Graphics object to a Graphics2D object
  

  public void paintComponent(Graphics g) {    super.paintComponent(g);  // Typical Swing approach    Graphics2D g2d = (Graphics2D)g;    g2d.doSomeStuff(...);    ...  }  

    
• Create a Shape object

  Rectangle2D.Double rect = ...;  Ellipse2D.Double ellipse = ...;  Polygon poly = ...;  GeneralPath path = ...;  SomeShapeYouDefined shape = ...; // Satisfies Shape interface  ...  

    
• Optional: modify drawing parameters

  g2d.setPaint(fillColorOrPattern);  g2d.setStroke(penThicknessOrPattern);  g2d.setComposite(someAlphaComposite);  g2d.setFont(someFont);  g2d.translate(...);  g2d.rotate(...);  g2d.scale(...);  g2d.shear(...);  g2d.setTransform(someAffineTransform);  

    
• Draw an outlined or solid version of the Shape

  g2d.draw(someShape);  g2d.fill(someShape);  

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