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Class Pixmap.Pixmap

java.lang.Object
   |
   +----java.awt.Component
           |
           +----java.awt.Canvas
                   |
                   +----Pixmap.Pixmap

public class Pixmap

extends Canvas

implements ActionListener

 Class for manipulating graphics images
 originally developed in C++
 revision history for C++ version
 

  Modified: 3/21/94 
            11/29/94
            4/13/95 
 

 Ported: 10/16/1996 to Java (Syam Gadde)
 re-implemented, ported to 1.1 6/1/97 (Owen Astrachan)
 

 this class represents an image that supports
 manipulation, i.e., reflection, expansion, inversion, etc.
 It has an analog in C++ for comparison between the two languages
 although there is more support in Java for images than there is
 in C++.
 

 Creating a pixmap requires a filename that should be a gif or jpg
 image (or others if getImage() supports them).  Currently the
 filename represents a local image, but changing the URL to support
 network retrievable images should be straightforward
 

Author:

Owen Astrachan, Syam Gadde

Pixmap(Frame, PixController, String)

create a pixmap (by reading a local file), the pixmap is added to a PixApp, and displayed in a frame

actionPerformed(ActionEvent)

redisplays this pixmap as the active pixmap

expand(int, int)

getIcon()

getPreferredSize()

overrides Component.getPreferredSize()

horizReflect()

reflect this horizontally (which means through a vertical line drawn through the middle of the Pixmap) ---> | <---

invert()

turn all pixels to there 'opposite color'.

paint(Graphics)

overrides Component.paint()

vertReflect()

 public Pixmap(Frame parent,
               PixController control,
               String filename)

create a pixmap (by reading a local file), the pixmap is added to a PixApp, and displayed in a frame

Parameters:

parent - the frame in which the pixmap is displayed

app - the Application to which this pixmap will be added

filename - complete pathname of the local file that can be read by getImage()

 public void actionPerformed(ActionEvent ev)

redisplays this pixmap as the active pixmap

Parameters:

ev - the action event causing the redisplay

 public PixIcon getIcon()

Returns:

the PixIcon associated with this Pixmap

 public Dimension getPreferredSize()

overrides Component.getPreferredSize()

Overrides:

getPreferredSize in class Component

 public void paint(Graphics g)

overrides Component.paint()

Overrides:

paint in class Canvas

 public void vertReflect()

 public void horizReflect()

reflect this horizontally (which means through a vertical line drawn through the middle of the Pixmap) ---> | <---

 public void expand(int rowExpand,
                    int colExpand)

 public void invert()

turn all pixels to there 'opposite color'. Black to white, white to black, and invert RGB pixel by taking negative relative to 255 (max RGB value), i.e., red = 255 - red, and similarly for blue and green pixel values

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