DitherTestpublic class DitherTest extends Applet implements Runnable
| Fields Summary |
|---|
| private static final int | NOOP | | private static final int | RED | | private static final int | GREEN | | private static final int | BLUE | | private static final int | ALPHA | | private static final int | SATURATION | | private Thread | runner | | private DitherControls | XControls | | private DitherControls | YControls | | private DitherCanvas | canvas |
| Methods Summary |
|---|
| private void | applymethod(int[] c, int method, int step, int total, int[] vals)
if (method == NOOP) {
return;
}
int val = ((total < 2)
? vals[0]
: vals[0] + ((vals[1] - vals[0]) * step / (total - 1)));
switch (method) {
case RED:
c[0] = val;
break;
case GREEN:
c[1] = val;
break;
case BLUE:
c[2] = val;
break;
case ALPHA:
c[3] = val;
break;
case SATURATION:
int max = Math.max(Math.max(c[0], c[1]), c[2]);
int min = max * (255 - val) / 255;
if (c[0] == 0) {
c[0] = min;
}
if (c[1] == 0) {
c[1] = min;
}
if (c[2] == 0) {
c[2] = min;
}
break;
}
| | private java.awt.Image | calculateImage()Calculates and returns the image. Halts the calculation and returns
null if the Applet is stopped during the calculation.
Thread me = Thread.currentThread();
int width = canvas.getSize().width;
int height = canvas.getSize().height;
int xvals[] = new int[2];
int yvals[] = new int[2];
int xmethod = XControls.getParams(xvals);
int ymethod = YControls.getParams(yvals);
int pixels[] = new int[width * height];
int c[] = new int[4]; //temporarily holds R,G,B,A information
int index = 0;
for (int j = 0; j < height; j++) {
for (int i = 0; i < width; i++) {
c[0] = c[1] = c[2] = 0;
c[3] = 255;
if (xmethod < ymethod) {
applymethod(c, xmethod, i, width, xvals);
applymethod(c, ymethod, j, height, yvals);
} else {
applymethod(c, ymethod, j, height, yvals);
applymethod(c, xmethod, i, width, xvals);
}
pixels[index++] = ((c[3] << 24) |
(c[0] << 16) |
(c[1] << 8) |
c[2]);
}
// Poll once per row to see if we've been told to stop.
if (runner != me) {
return null;
}
}
return createImage(new MemoryImageSource(width, height,
ColorModel.getRGBdefault(), pixels, 0, width));
| | private int | colormethod(java.lang.String s, int[] vals)
int method = NOOP;
if (s == null) {
s = "";
}
String lower = s.toLowerCase();
int len = 0;
if (lower.startsWith("red")) {
method = RED;
lower = lower.substring(3);
} else if (lower.startsWith("green")) {
method = GREEN;
lower = lower.substring(5);
} else if (lower.startsWith("blue")) {
method = BLUE;
lower = lower.substring(4);
} else if (lower.startsWith("alpha")) {
method = ALPHA;
lower = lower.substring(5);
} else if (lower.startsWith("saturation")) {
method = SATURATION;
lower = lower.substring(10);
}
if (method == NOOP) {
vals[0] = 0;
vals[1] = 0;
return method;
}
int begval = 0;
int endval = 255;
try {
int dash = lower.indexOf('-");
if (dash < 0) {
endval = Integer.parseInt(lower);
} else {
begval = Integer.parseInt(lower.substring(0, dash));
endval = Integer.parseInt(lower.substring(dash + 1));
}
} catch (NumberFormatException nfe) {
}
if (begval < 0) {
begval = 0;
} else if (begval > 255) {
begval = 255;
}
if (endval < 0) {
endval = 0;
} else if (endval > 255) {
endval = 255;
}
vals[0] = begval;
vals[1] = endval;
return method;
| | public void | destroy()
remove(XControls);
remove(YControls);
remove(canvas);
| | public java.lang.String | getAppletInfo()
return "An interactive demonstration of dithering.";
| | public java.lang.String[][] | getParameterInfo()
String[][] info = {
{"xaxis", "{RED, GREEN, BLUE, ALPHA, SATURATION}",
"The color of the Y axis. Default is RED."},
{"yaxis", "{RED, GREEN, BLUE, ALPHA, SATURATION}",
"The color of the X axis. Default is BLUE."}
};
return info;
| | public void | init()
String xspec = null, yspec = null;
int xvals[] = new int[2];
int yvals[] = new int[2];
try {
xspec = getParameter("xaxis");
yspec = getParameter("yaxis");
} catch (NullPointerException npe) {
//only occurs if run as application
}
if (xspec == null) {
xspec = "red";
}
if (yspec == null) {
yspec = "blue";
}
int xmethod = colormethod(xspec, xvals);
int ymethod = colormethod(yspec, yvals);
setLayout(new BorderLayout());
XControls = new DitherControls(this, xvals[0], xvals[1],
xmethod, false);
YControls = new DitherControls(this, yvals[0], yvals[1],
ymethod, true);
YControls.addRenderButton();
add("North", XControls);
add("South", YControls);
add("Center", canvas = new DitherCanvas());
| | public static void | main(java.lang.String[] args)
Frame f = new Frame("DitherTest");
DitherTest ditherTest = new DitherTest();
ditherTest.init();
f.add("Center", ditherTest);
f.pack();
f.setVisible(true);
ditherTest.start();
| | public void | run()
canvas.setImage(null); // Wipe previous image
Image img = calculateImage();
if (img != null && runner == Thread.currentThread()) {
canvas.setImage(img);
}
| | public void | start()
runner = new Thread(this);
runner.start();
| | public void | stop()
runner = null;
|
|
