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/*------------------------------------------------------------------------*
* Originally implemented by Scott Flinn, in association with the
* Imager Graphics Laboratory at the University of British Columbia
* (scottflinn@alumni.uwaterloo.ca).
*
* This source code may be freely distributed and modified for any purpose
* as long as these introductory comments are not removed. Please be
* aware that this represents the author's initial experiments with the
* Java platform and should not necessarily be considered good examples
* of Java programming.
*------------------------------------------------------------------------*/
/*------------------------------------------------------------------------*
* The BW class implements the black-white contrast illusion. It is
* meant to be run in a separate window using AppletStarter.
*------------------------------------------------------------------------*/
import java.awt.*;
/*------------------------------ Class BW ------------------------------*/
public class BWApplication extends Panel
{
static BWPanel canvas;
static BWControls controls;
static Button dismiss;
public static void main(String[] args){
Frame f = new Frame();
f.addWindowListener(new java.awt.event.WindowAdapter() {
public void windowClosing(java.awt.event.WindowEvent e) {
System.exit(0);
};
});
/*----------------------- constructor ------------------------*/
GridBagLayout gridbag;
GridBagConstraints c;
// Create the layout manager and a constraint object
gridbag = new GridBagLayout();
c = new GridBagConstraints();
f.setLayout( gridbag );
// Create the canvas panel and put it on top
canvas = new BWPanel();
c.gridwidth = GridBagConstraints.REMAINDER;
c.fill = GridBagConstraints.BOTH;
c.weightx = 1.0;
c.weighty = 1.0;
gridbag.setConstraints( canvas, c );
f.add( canvas );
// Create the control panel and put it second from the bottom
controls = new BWControls( canvas );
c.fill = GridBagConstraints.HORIZONTAL;
c.weighty = 0.0;
gridbag.setConstraints( controls, c );
f.add( controls );
// Create the dismiss button and put it at the bottom
dismiss = new Button( "Dismiss" );
gridbag.setConstraints( dismiss, c );
f.add( dismiss );
f.validate();
f.setVisible(true);
f.setSize(800,800);
f.setTitle("BWApplication");
f.validate();
}
/*-------------------------- action --------------------------*/
public boolean action( Event event, Object obj )
{
if ( event.target == dismiss )
{
hide();
System.exit(0);
return true;
}
return false;
}
}
/*--------------------------- Class BWPanel ----------------------------*/
class BWPanel extends Panel
{
// Gray range and initial values
public final int minColour = 0;
public final int maxColour = 255;
public final int startLeftColour = 128; // 50%
public final int startRightColour = 128; // 50%
// Drawing colours -- modified through setLeftGray and setRightGray methods
private Color leftColour;
private Color rightColour;
// Other drawing parameters -- can be modified directly
public final int minCenterSize = 5; // percent
public final int maxCenterSize = 100; // percent
public int centerSize = 40; // percent
public boolean showCenter = true;
public boolean inColour = false;
// Off-screen drawing buffer
private Dimension offDimension;
private Image offImage;
private Graphics offGraphics = null;
/*----------------------- constructor ------------------------*/
BWPanel()
{
int c;
// Create colour objects
c = startLeftColour;
leftColour = new Color( c, c, c );
c = startRightColour;
rightColour = new Color( c, c, c );
}
/*-------------------------- paint ---------------------------*/
public void paint( Graphics g )
{
update( g );
}
/*-------------------------- update --------------------------*/
public void update( Graphics g )
{
// Dimension d = size();
Dimension d = getSize();
int halfWidth = d.width / 2;
int squareSize;
int dx, dy;
// Create off-screen image for double buffering
if ( ( offGraphics == null ) ||
( d.width != offDimension.width ) ||
( d.height != offDimension.height ) )
{
offDimension = d;
offImage = createImage( d.width, d.height );
offGraphics = offImage.getGraphics();
}
// Draw left half background
if ( inColour )
offGraphics.setColor( showCenter ? Color.green : leftColour );
else
offGraphics.setColor( showCenter ? Color.white : leftColour );
offGraphics.fillRect( 0, 0, halfWidth, d.height );
// Draw right half background
offGraphics.setColor( showCenter ? Color.black : rightColour );
offGraphics.fillRect( halfWidth, 0, halfWidth, d.height );
// Draw centers if requested
if ( d.height < halfWidth )
squareSize = ( d.height * centerSize ) / 100;
else
squareSize = ( halfWidth * centerSize ) / 100;
if ( showCenter )
{
// Get horizontal and vertical border sizes
dx = ( halfWidth - squareSize ) / 2;
dy = ( d.height - squareSize ) / 2;
// Draw blocks in selected colour
offGraphics.setColor( leftColour );
offGraphics.fillRect( dx, dy, squareSize, squareSize );
offGraphics.setColor( rightColour );
offGraphics.fillRect(
dx + halfWidth, dy, squareSize, squareSize );
}
// Draw a black border
offGraphics.setColor( Color.black );
offGraphics.drawRect( 0, 0, d.width - 1, d.height - 1 );
// Finally, copy the off-screen image to the screen
g.drawImage( offImage, 0, 0, this );
}
/*---------------------- setLeftColour -----------------------*/
public void setLeftColour( int c )
{
if ( inColour )
leftColour = new Color( 0, c, 0 );
else
leftColour = new Color( c, c, c );
update( getGraphics() );
}
/*---------------------- setRightColour ----------------------*/
public void setRightColour( int c )
{
if ( inColour )
rightColour = new Color( 0, c, 0 );
else
rightColour = new Color( c, c, c );
update( getGraphics() );
}
/*------------------------ setCenter -------------------------*/
public void setCenter( boolean showCenter )
{
this.showCenter = showCenter;
update( getGraphics() );
}
/*----------------------- setInColour -----------------------*/
public void setInColour( boolean inColour )
{
this.inColour = inColour;
setLeftColour( leftColour.getGreen() );
setRightColour( rightColour.getGreen() );
update( getGraphics() );
}
}
/*-------------------------- Class BWControls --------------------------*/
class BWControls extends Panel
{
Scrollbar leftSlider; // Controls gray intensity of left side
Scrollbar rightSlider; // Controls gray intensity of right side
Scrollbar sizeSlider; // Controls size of center block
Checkbox showCenter; // Toggles drawing of center blocks
Checkbox inColour; // Toggles drawing between gray and green
BWPanel canvas; // The main drawing canvas
/*----------------------- constructor ------------------------*/
BWControls( BWPanel canvas )
{
GridBagLayout gridbag;
GridBagConstraints c;
Panel boxPanel;
// Record id of drawing canvas
this.canvas = canvas;
// Use a GridBag to lay things out
gridbag = new GridBagLayout();
c = new GridBagConstraints();
setLayout( gridbag );
// Create sliders and check boxes
leftSlider =
new Scrollbar(
Scrollbar.HORIZONTAL, canvas.startLeftColour,
( canvas.maxColour - canvas.minColour ) / 10,
canvas.minColour, canvas.maxColour );
rightSlider =
new Scrollbar(
Scrollbar.HORIZONTAL, canvas.startRightColour,
( canvas.maxColour - canvas.minColour ) / 10,
canvas.minColour, canvas.maxColour );
sizeSlider =
new Scrollbar(
Scrollbar.HORIZONTAL, canvas.centerSize,
( canvas.maxCenterSize - canvas.minCenterSize ) / 10,
canvas.minCenterSize, canvas.maxCenterSize );
inColour = new Checkbox( "Colour" );
showCenter = new Checkbox( "Backgrounds only" );
showCenter.setState( ! canvas.showCenter );
// Add check boxes in double column using a panel container
boxPanel = new Panel();
boxPanel.add( inColour );
boxPanel.add( showCenter );
addControl( (Component)boxPanel, 1.0, GridBagConstraints.HORIZONTAL,
GridBagConstraints.REMAINDER, gridbag, c );
// Add labels and sliders
addControl( (Component)(new Label( "Left intensity", Label.RIGHT )),
0.0, GridBagConstraints.NONE, 1, gridbag, c );
addControl( (Component)leftSlider, 1.0, GridBagConstraints.HORIZONTAL,
GridBagConstraints.REMAINDER, gridbag, c );
addControl( (Component)(new Label( "Right intensity", Label.RIGHT )),
0.0, GridBagConstraints.NONE, 1, gridbag, c );
addControl( (Component)rightSlider, 1.0, GridBagConstraints.HORIZONTAL,
GridBagConstraints.REMAINDER, gridbag, c );
addControl( (Component)(new Label( "Center size", Label.RIGHT )),
0.0, GridBagConstraints.NONE, 1, gridbag, c );
addControl( (Component)sizeSlider, 1.0, GridBagConstraints.HORIZONTAL,
GridBagConstraints.REMAINDER, gridbag, c );
}
/*------------------------ addControl ------------------------*/
private void
addControl( Component component, double wx, int fill, int gw,
GridBagLayout gb, GridBagConstraints c )
{
c.weightx = (float)wx;
c.weighty = 1.0;
c.fill = fill;
c.gridwidth = gw;
gb.setConstraints( component, c );
add( component );
}
/*-------------------------- insets --------------------------*/
public Insets insets()
{
return( new Insets( 5, 5, 5, 5 ) );
}
/*-------------------------- action --------------------------*/
public boolean action( Event event, Object obj )
{
if ( event.target == showCenter )
{
// Toggle showCenter flag of canvas
canvas.setCenter( ! showCenter.getState() );
return true;
}
if ( event.target == inColour )
{
// Toggle inColour flag of canvas
canvas.setInColour( inColour.getState() );
return true;
}
return false;
}
/*----------------------- handleEvent ------------------------*/
public boolean handleEvent( Event event )
{
if ( event.target == leftSlider )
{
// adjust left colour and redraw
canvas.setLeftColour( leftSlider.getValue() );
return true;
}
else if ( event.target == rightSlider )
{
// adjust right colour and redraw
canvas.setRightColour( rightSlider.getValue() );
return true;
}
else if ( event.target == sizeSlider )
{
// adjust center block size and redraw
canvas.centerSize = sizeSlider.getValue();
canvas.update( canvas.getGraphics() );
return true;
}
else
return super.handleEvent( event );
}
}
/*------------------------------------------------------------------------*/ |
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