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3 Creating a 2D image

The general structure of a program creating an image in a plane can be described schematically as follows:

• Definition the display context:
  • Definition of the terminal on which the image will be displayed
  • Definition of the context, i.e. the masks and windows
• Description of the image
• Display

The rest of this chapter describes, among the different points mentioned above, those corresponding to the 2D case (Chapter 2, dealing with general tools, describe those corresponding to a general application).

• 3.1 Masks and windows
• 3.2 Graphics instructions: 2D