Package org.jcsp.awt

Class GraphicsProtocol

  • Direct Known Subclasses:
    GraphicsProtocol.General, GraphicsProtocol.MakeMISImage, GraphicsProtocol.SetBackground, GraphicsProtocol.SetPaintable

    public abstract class GraphicsProtocol
    extends TaggedProtocol
    This is the tagged protocol for use over the toGraphics configuration channel of an active graphics component.

    Description

    GraphicsProtocol is the tagged protocol for use over the toGraphics configuration channel of an active graphics component (for example, see ActiveCanvas.setGraphicsChannels).

    It is a collection of static immutable enquiry/configuration objects and static configuration classes. An enquiry sent down the toGraphics channel generates an appropriate reply on the fromGraphics channel. A configuration class may be used to construct an immutable configuration object that may be sent down the toGraphics channel to configure some property of the graphics component. A configuration message is always acknowledged with a Boolean.TRUE returned on the fromGraphics channel (once the configuration has happened).

    Author:
    P.H. Welch
    See Also:
    ActiveCanvas, TaggedProtocol
    • Nested Class Summary

      Nested Classes 
      Modifier and Type Class Description
      static interface  GraphicsProtocol.Configure
      This is the interface for general configuration of the graphics component.
      static class  GraphicsProtocol.General
      This is a general configuration class for the graphics component.
      static class  GraphicsProtocol.MakeMISImage
      This is a configuration class to associate a java.awt.image.MemoryImageSource with the graphics component.
      static class  GraphicsProtocol.SetBackground
      This is a configuration class for setting the background java.awt.Color of the active graphics component.
      static class  GraphicsProtocol.SetPaintable
      This is a configuration class to register a org.jcsp.awt.Paintable object with the graphics component.
    • Method Summary

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    • Field Detail

      • GET_DIMENSION

        public static final GraphicsProtocol GET_DIMENSION
        This is an enquiry object to find the size of the active graphics component. The java.awt.Dimension will be returned down the fromGraphics channel.
      • GET_COMPONENT

        public static final GraphicsProtocol GET_COMPONENT
        This is an enquiry object to obtain the active graphics component. The java.awt.Component will be returned down the fromGraphics channel.
      • GET_BACKGROUND

        public static final GraphicsProtocol GET_BACKGROUND
        This is an enquiry object to find the background colour of the active graphics component. The background java.awt.Color will be returned down the fromGraphics channel.
      • REQUEST_FOCUS

        public static final GraphicsProtocol REQUEST_FOCUS
        This is a configuration object to request input focus on the graphics component for keyboard and mouse evnts. A Boolean.TRUE will be returned down the fromGraphics channel.