CLSFractalpublic class CLSFractal extends Applet implements Runnable| A (not-yet) Context sensitive L-System Fractal applet class.
The rules for the Context L-system are read from the java.applet.Applet's
attributes and then the system is iteratively applied for the
given number of levels, possibly drawing each generation as it
is generated. Note that the ContextLSystem class does not yet
handle the lContext and rContext attributes, although this
class is already designed to parse the '[' and ']' characters
typically used in Context sensitive L-Systems. |
| Fields Summary |
|---|
| ContextLSystem | cls | | int | fractLevel | | int | repaintDelay | | boolean | incrementalUpdates | | float | startAngle | | float | rotAngle | | float | Xmin | | float | Xmax | | float | Ymin | | float | Ymax | | int | border | | boolean | normalizescaling | | Thread | kicker | | String | savedPath |
| Methods Summary |
|---|
| void | includePt(float x, float y)
if (x < Xmin)
Xmin = x;
if (x > Xmax)
Xmax = x;
if (y < Ymin)
Ymin = y;
if (y > Ymax)
Ymax = y;
| | public void | init()
String s;
cls = new ContextLSystem(this);
s = getParameter("level");
if (s != null) fractLevel = Integer.parseInt(s);
s = getParameter("incremental");
if (s != null) incrementalUpdates = s.equals("true");
s = getParameter("delay");
if (s != null) repaintDelay = Integer.parseInt(s);
s = getParameter("startAngle");
if (s != null) startAngle = Float.valueOf(s).floatValue();
s = getParameter("rotAngle");
if (s != null) rotAngle = Float.valueOf(s).floatValue();
rotAngle = rotAngle / 360 * 2 * 3.14159265358f;
s = getParameter("border");
if (s != null) border = Integer.parseInt(s);
s = getParameter("normalizescale");
if (s != null) normalizescaling = s.equals("true");
| | public boolean | mouseUp(java.awt.Event evt, int x, int y)
cls = new ContextLSystem(this);
savedPath = null;
start();
return true;
| | public void | paint(java.awt.Graphics g)
String fractalPath = cls.getPath();
if (fractalPath == null) {
super.paint(g);
return;
}
if (savedPath == null || !savedPath.equals(fractalPath)) {
savedPath = fractalPath;
render(null, fractalPath);
}
for (int i = 0; i < border; i++) {
g.draw3DRect(i, i, size().width - i * 2, size().height - i * 2,false);
}
render(g, fractalPath);
| | void | render(java.awt.Graphics g, java.lang.String path)
Stack turtleStack = new Stack();
CLSTurtle turtle;
if (g == null) {
Xmin = 1E20f;
Ymin = 1E20f;
Xmax = -1E20f;
Ymax = -1E20f;
turtle = new CLSTurtle(startAngle, 0, 0, 0, 0, 1, 1);
} else {
float frwidth = Xmax - Xmin;
if (frwidth == 0)
frwidth = 1;
float frheight = Ymax - Ymin;
if (frheight == 0)
frheight = 1;
float xscale = (size().width - border * 2 - 1) / frwidth;
float yscale = (size().height - border * 2 - 1) / frheight;
int xoff = border;
int yoff = border;
if (normalizescaling) {
if (xscale < yscale) {
yoff += ((size().height - border * 2)
- ((Ymax - Ymin) * xscale)) / 2;
yscale = xscale;
} else if (yscale < xscale) {
xoff += ((size().width - border * 2)
- ((Xmax - Xmin) * yscale)) / 2;
xscale = yscale;
}
}
turtle = new CLSTurtle(startAngle, 0 - Xmin, 0 - Ymin,
xoff, yoff, xscale, yscale);
}
for (int pos = 0; pos < path.length(); pos++) {
switch (path.charAt(pos)) {
case '+":
turtle.rotate(rotAngle);
break;
case '-":
turtle.rotate(-rotAngle);
break;
case '[":
turtleStack.push(turtle);
turtle = new CLSTurtle(turtle);
break;
case ']":
turtle = (CLSTurtle) turtleStack.pop();
break;
case 'f":
turtle.jump();
break;
case 'F":
if (g == null) {
includePt(turtle.X, turtle.Y);
turtle.jump();
includePt(turtle.X, turtle.Y);
} else {
turtle.draw(g);
}
break;
default:
break;
}
}
| | public void | run()
Thread me = Thread.currentThread();
boolean needsRepaint = false;
while (kicker == me && cls.getLevel() < fractLevel) {
cls.generate();
if (kicker == me && incrementalUpdates) {
repaint();
try {Thread.sleep(repaintDelay);} catch (InterruptedException e){}
} else {
needsRepaint = true;
}
}
if (kicker == me) {
kicker = null;
if (needsRepaint) {
repaint();
}
}
| | public void | start()
kicker = new Thread(this);
kicker.start();
| | public void | stop()
kicker = null;
|
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