/*
* @(#)DitherTest.java 1.3 96/12/06
*
* Copyright (c) 1994-1996 Sun Microsystems, Inc. All Rights Reserved.
*
* Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
* modify and redistribute this software in source and binary code form,
* provided that i) this copyright notice and license appear on all copies of
* the software; and ii) Licensee does not utilize the software in a manner
* which is disparaging to Sun.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
* IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
* NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
* LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
* OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
* LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
* INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
* CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
* OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*
* This software is not designed or intended for use in on-line control of
* aircraft, air traffic, aircraft navigation or aircraft communications; or in
* the design, construction, operation or maintenance of any nuclear
* facility. Licensee represents and warrants that it will not use or
* redistribute the Software for such purposes.
*/
import java.applet.Applet;
import java.awt.*;
import java.awt.image.ColorModel;
import java.awt.image.MemoryImageSource;
import java.lang.InterruptedException;
public class DitherTest extends Applet implements Runnable {
final static int NOOP = 0;
final static int RED = 1;
final static int GREEN = 2;
final static int BLUE = 3;
final static int ALPHA = 4;
final static int SATURATION = 5;
ThreadGroup appletThreadGroup;
Thread kicker;
DitherControls XControls;
DitherControls YControls;
DitherCanvas canvas;
public void init() {
String xspec, yspec;
int xvals[] = new int[2];
int yvals[] = new int[2];
try {
xspec = getParameter("xaxis");
} catch (Exception e) {
xspec = null;
}
try {
yspec = getParameter("yaxis");
} catch (Exception e) {
yspec = null;
}
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());
appletThreadGroup = Thread.currentThread().getThreadGroup();
}
public synchronized void start() {
if (canvas.getImage() == null) {
kicker = new Thread(appletThreadGroup, this);
kicker.start();
}
}
public synchronized void stop() {
try {
if (kicker != null) {
kicker.stop();
}
} catch (Exception e) {
}
kicker = null;
}
public void restart() {
stop();
canvas.setImage(null);
start();
}
public static void main(String args[]) {
Frame f = new Frame("DitherTest");
DitherTest ditherTest = new DitherTest();
ditherTest.init();
f.add("Center", ditherTest);
f.pack();
f.show();
ditherTest.start();
}
int colormethod(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(4);
} 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) {
begval = endval = Integer.parseInt(lower);
} else {
begval = Integer.parseInt(lower.substring(0, dash));
endval = Integer.parseInt(lower.substring(dash+1));
}
} catch (Exception e) {
}
if (begval < 0) begval = 0;
if (endval < 0) endval = 0;
if (begval > 255) begval = 255;
if (endval > 255) endval = 255;
vals[0] = begval;
vals[1] = endval;
return method;
}
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;
}
}
public void run() {
Thread me = Thread.currentThread();
me.setPriority(3);
int width = canvas.size().width;
int height = canvas.size().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];
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] << 0));
if (kicker != me) {
return;
}
}
}
newImage(me, width, height, pixels);
}
synchronized void newImage(Thread me, int width, int height,
int pixels[]) {
if (kicker != me) {
return;
}
Image img;
img = createImage(new MemoryImageSource(width, height,
ColorModel.getRGBdefault(),
pixels, 0, width));
canvas.setImage(img);
kicker = null;
}
}
class DitherCanvas extends Canvas {
Image img;
static String calcString = "Calculating...";
public void paint(Graphics g) {
int w = size().width;
int h = size().height;
if (img == null) {
super.paint(g);
g.setColor(Color.black);
FontMetrics fm = g.getFontMetrics();
int x = (w - fm.stringWidth(calcString))/2;
int y = h/2;
g.drawString(calcString, x, y);
} else {
g.drawImage(img, 0, 0, w, h, this);
}
}
public Dimension minimumSize() {
return new Dimension(20, 20);
}
public Dimension preferredSize() {
return new Dimension(200, 200);
}
public Image getImage() {
return img;
}
public void setImage(Image img) {
this.img = img;
repaint();
}
}
class DitherControls extends Panel {
TextField start;
TextField end;
Button button;
Choice choice;
DitherTest applet;
static LayoutManager dcLayout = new FlowLayout(FlowLayout.CENTER, 10, 5);
public DitherControls(DitherTest app, int s, int e, int type,
boolean vertical) {
applet = app;
setLayout(dcLayout);
add(new Label(vertical ? "Vertical" : "Horizontal"));
add(choice = new Choice());
choice.addItem("Noop");
choice.addItem("Red");
choice.addItem("Green");
choice.addItem("Blue");
choice.addItem("Alpha");
choice.addItem("Saturation");
choice.select(type);
add(start = new TextField(Integer.toString(s), 4));
add(end = new TextField(Integer.toString(e), 4));
}
public void addRenderButton() {
add(button = new Button("New Image"));
}
public int getParams(int vals[]) {
vals[0] = Integer.parseInt(start.getText());
vals[1] = Integer.parseInt(end.getText());
return choice.getSelectedIndex();
}
public boolean action(Event ev, Object arg) {
if (ev.target instanceof Button) {
applet.restart();
return true;
}
return false;
}
}
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