• Purpose:
  • Determine how to present graphics primitives on a visual output device
• In Java:
  • The rendering engine is a Graphics2D object

• The RGB Model:
  • Begin with black then add red, green, and or blue
  • An additive model
  • Often used for displays/monitors
• The CMYK Model:
  • Begin with white then remove cyan, magenta, and/or yellow
  • A subtractive model
  • Often used for printing

• Coordinates:
  • Quantities (linear and/or angular) that designate the position of a point in relation to a given reference frame
• In Java:
  • 

• Geometric Shapes (see the Shape interface):
  • draw(Shape s)
  • fill(Shape s)
• Strings/Text:
  • drawString(String s, float x, float y)
• Images:
  • drawImage(Image i, int x, int y, null)

• 0-Dimensional:
  • Points (Point2D )
• 1-Dimensional:
  • Lines (Line2D )
  • Curves (CubicCurve2D and QuadCurve2D )
• 2-Dimensional:
  • Rectangles(Rectangle2D )
  • Polygons (GeneralPath )
  • Ellipses (Ellipse2D )

• Stroke:
  • The line "style" (see the Stroke interface)
  • Set using the setStroke method in Graphics2D
• Color:
  • The line color (see the Color class)
  • Set using the setColor method in Graphics2D

• Paint:
  • The fill "style" and color (see the Paint interface)
  • Set using the setPaint method in Graphics2D
• Types:
  • Color
  • GradientPaint
  • TexturePaint

• Font:
  • The "glyphs" used for each character
  • Set using the setFont method in Graphics2D
• Properties:
  • Name
  • Size (in points)
  • Style (plain, italic, bold)

Line Metrics

The x and y passed to drawString(String s, float x, float y) are the left end of the baseline.

• FontRenderContext
  • Keeps information about fonts
• LineMetrics
  • Keeps information about font and line heights

• BufferedImage Class:
  • Extends the abstract Image class
  • Objects can be read from a file using the static read() method in the ImageIO class
• The drawImage(Image i, int x, int y, null) Method:
  • x and y determine where the the upper-left corner of the Image will be rendered

• Motivation:
  • You need a GUI component to render in
  • You can extend any GUI component, you just need to override the public void paint(Graphics g) method
• A Good Class to Extend:
  • JComponent which does very little in its paint() method