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// $Id$
import java.awt.*;
import java.util.*;
public class Graph extends Canvas
{
private static final int MIN_SPACING = 2;
private static final int POINT_HISTORY = 200;
private static final Font FONT = new Font ("Dialog", Font.PLAIN, 10);
private Queue plot_;
private String title_;
private Graphics offgraphics_;
private Image offscreen_;
private Dimension offscreensize_;
private int max_value_;
private int old_max_value_;
private int spacing_;
private float local_max_ = 0;
private boolean max_increased_ = false;
public Graph(String title, int max_value)
{
super();
plot_ = new Queue();
spacing_ = MIN_SPACING;
title_ = title;
max_value_ = max_value;
old_max_value_ = max_value;
}
public Dimension getMinimumSize ()
{
return new Dimension (75, 75);
}
public Dimension getPreferredSize ()
{
return new Dimension (175, 175);
}
public void addNewData(float new_point)
{
Float temp = (Float)plot_.dequeue_tail();
plot_.enqueue_head(new Float(new_point));
if (new_point > local_max_)
local_max_ = new_point;
while (local_max_ > max_value_)
max_value_ *= 2;
while ((local_max_ < max_value_/2) && (max_value_ > old_max_value_))
max_value_ /= 2;
repaint();
}
public void update(Graphics g)
{
Dimension d = getSize ();
float tmp, value_1, value_2;
FontMetrics fm = g.getFontMetrics ();
Enumeration queue_iter = plot_.forward_iterator();
int x1 = d.width - 8, y1, x2, y2, fheight = fm.getHeight (), i;
String value = "Value (of " + max_value_ + "): " + String.valueOf(plot_.head());
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);
local_max_ = 0;
offgraphics_.setColor (getBackground());
offgraphics_.fillRect (0, 0, offscreensize_.width, offscreensize_.height);
offgraphics_.setColor (getForeground());
offgraphics_.drawString(title_, 5, fheight);
offgraphics_.drawString(value, 5, offscreensize_.height - 5);
value_1 = ((Float)queue_iter.nextElement()).floatValue();
while (queue_iter.hasMoreElements())
{
value_2 = ((Float)queue_iter.nextElement()).floatValue();
if (value_1 > local_max_)
local_max_ = value_1;
y1 = normalize(offscreensize_.height - fheight, value_1);
y2 = normalize(offscreensize_.height - fheight, value_2);
tmp = value_2;
value_2 = value_1;
value_1 = tmp;
x2 = x1 - spacing_;
offgraphics_.drawLine(x1, y1, x2, y2);
x1 = x2;
if (x1 <= 5)
break;
}
g.drawImage(offscreen_, 3, 3, null);
}
public void paint(Graphics g)
{
Dimension d = getSize ();
int plot_length = plot_.length();
int num_points = d.width / spacing_;
if (plot_.length() < num_points)
{
for (int i = 0; i < num_points - plot_length; i++)
plot_.enqueue_tail(new Float(0));
}
else if (plot_.length() > num_points)
{
for (int i = 0; i < plot_length - num_points; i++)
plot_.dequeue_tail();
}
update(g);
}
public String getKey()
{
return title_;
}
public int getMax()
{
return old_max_value_;
}
private int normalize(int height, float coord)
{
float ratio = (float)coord/max_value_;
float pixels = (float)height*ratio;
float location = (float)height - pixels;
return Math.round(location);
}
public void updateDisplay(float information)
{
addNewData(information);
repaint();
}
}
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