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// $Id$
//
// = FILENAME
// PersianVisComp.java
//
// = AUTHOR
// Chris Gill <cdgill@cs.wustl.edu>
//
// = DESCRIPTION
// This is a Visualization Component for displaying a Persian
// Recursion drawing.
//
// ============================================================================
import java.awt.*;
import java.util.*;
// This was needed to help the class loader.
import java.awt.image.MemoryImageSource;
public class PersianVisComp extends Canvas implements VisComp
{
private static final Font FONT = new Font ("Dialog", Font.PLAIN, 10);
private static final int PIXELS_WIDE = 256;
private static final int TOTAL_PIXELS = PIXELS_WIDE * PIXELS_WIDE;
private static final int DRAW_OFFSET = 32;
private String title_;
private Graphics offgraphics_;
private Image offscreen_;
private Dimension offscreensize_;
private int pixel_array_ [];
private MemoryImageSource image_source_;
public PersianVisComp ()
{
super ();
title_ = "";
this.setBackground (Color.white);
this.setForeground (Color.black);
pixel_array_ = new int [TOTAL_PIXELS];
for (int i = 0; i < TOTAL_PIXELS; ++i)
pixel_array_ [i] = Color.white.getRGB ();
image_source_ = new MemoryImageSource (PIXELS_WIDE, PIXELS_WIDE,
pixel_array_, 0, PIXELS_WIDE);
}
public void drawPixels (int x1, int y1, int x2, int y2, Color c) {
int x_min;
int x_max;
int y_min;
int y_max;
int rgb_value = c.getRGB ();
if (x1 < 0 || y1 < 0 || x2 < 0 || y2 < 0
|| x1 >= PIXELS_WIDE || y1 >= PIXELS_WIDE
|| x2 >= PIXELS_WIDE || y2 >= PIXELS_WIDE)
{
System.err.println ("coordinates out of range: ("
+ x1 + ", " + y1 + ") ("
+ x2 + ", " + y2 + ")\n");
return;
}
if (x1 < x2)
{
x_min = x1;
x_max = x2;
}
else
{
x_min = x2;
x_max = x1;
}
if (y1 < y2)
{
y_min = y1;
y_max = y2;
}
else
{
y_min = y2;
y_max = y1;
}
// System.out.println ("Updating pixels: ("
// + x1 + ", " + y1 + ") ("
// + x2 + ", " + y2 + ")\n");
for (int x = x_min; x <= x_max; ++x)
for (int y = y_min; y <= y_max; ++y)
pixel_array_ [y * PIXELS_WIDE + x] = rgb_value;
}
public void setName (String title) {
title_ = title;
}
public int getProperty () {
return Properties.PERSIAN;
}
public Dimension getMinimumSize () {
return new Dimension (PIXELS_WIDE + 2 * DRAW_OFFSET,
PIXELS_WIDE + 2 * DRAW_OFFSET);
}
public Dimension getPreferredSize () {
return new Dimension (PIXELS_WIDE + 2 * DRAW_OFFSET,
PIXELS_WIDE + 2 * DRAW_OFFSET);
}
public String getName () {
return title_;
}
public void update (java.util.Observable observable, java.lang.Object obj)
{
PersianRecursion.Data data_temp_;
try {
data_temp_ = (PersianRecursion.Data) obj;
}
catch (Exception excp) {
data_temp_ = null;
System.out.println (excp);
System.out.println ("PR Visualization Component received exception!");
return;
}
Color c = Color.black;
if (data_temp_.line_color == PersianRecursion.Line_Color_t.BLUE)
{
c = Color.red;
// c = Color.blue;
}
else if (data_temp_.line_color == PersianRecursion.Line_Color_t.RED)
{
c = Color.yellow;
// c = Color.red;
}
else if (data_temp_.line_color == PersianRecursion.Line_Color_t.GREEN)
{
c = Color.blue;
// c = Color.green;
}
else if (data_temp_.line_color == PersianRecursion.Line_Color_t.YELLOW)
{
c = Color.green;
// c = Color.yellow;
}
drawPixels (data_temp_.x1, data_temp_.y1,
data_temp_.x2, data_temp_.y2, c);
// System.out.println ("PersianVisComp: drawing {"
// + data_temp_.x1 + ", " + data_temp_.y1 + ", "
// + data_temp_.x2 + ", " + data_temp_.y2 + "}");
repaint ();
}
public void update (Graphics g)
{
Dimension d = getSize ();
FontMetrics fm = g.getFontMetrics ();
int x1 = d.width - 8, y1, x2, y2, fheight = fm.getHeight (), i;
PersianRecursion.Data data_temp_;
if ((offscreen_ == null) ||
(offscreensize_.width != d.width - 8) ||
(offscreensize_.height != d.height - 8))
{
offscreen_ = createImage (d.width - 8, d.height - 8);
offscreensize_ = new Dimension (d.width - 8, d.height - 8);
offgraphics_ = offscreen_.getGraphics ();
offgraphics_.setFont (FONT);
}
g.setColor (Color.lightGray);
g.draw3DRect (0, 0, d.width - 1, d.height - 1, true);
g.draw3DRect (1, 1, d.width - 3, d.height - 3, true);
g.draw3DRect (2, 2, d.width - 5, d.height - 5, true);
offgraphics_.setColor (getBackground ());
offgraphics_.fillRect (0, 0, offscreensize_.width, offscreensize_.height);
offgraphics_.setColor (getForeground ());
offgraphics_.drawString (title_, 5, fheight);
Image img = createImage (image_source_);
offgraphics_.drawImage (img, DRAW_OFFSET, DRAW_OFFSET, null);
g.drawImage (offscreen_, 3, 3, null);
// System.out.println ("updated.");
}
public void paint (Graphics g)
{
update (g);
// System.out.println ("painted.");
}
}
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