[2915] in java-interest
Pb with graphics.setPaintMode()
daemon@ATHENA.MIT.EDU (Francois Boussard)
Fri Oct 20 13:57:21 1995
Date: Fri, 20 Oct 1995 16:40:44 GMT
From: Francois Boussard <francois@coplanet.fr>
To: java-interest@java.sun.com
Cc: francois@coplanet.fr
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Hy all,
I found another bug : after a usage of XOR mode, you can't normaly
turn it off for using a desired color in paint mode !.
I send here source, html file, tried it on Netscape 2.0 Solaris 2.4.
The problem is line 106 - 109
I think it could be easily fixed.
By !
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import java.applet.Applet;
import java.awt.Image;
import java.awt.Event;
import java.awt.Graphics;
import java.awt.Color;
import java.io.StreamTokenizer;
import java.io.InputStream;
import java.io.BufferedInputStream;
import java.net.URL;
import java.util.Hashtable;
import java.awt.image.IndexColorModel;
import java.awt.image.ColorModel;
import java.awt.image.MemoryImageSource;
public class line
extends java.applet.Applet
implements Runnable
{
boolean alive=false;
boolean painted=false;
boolean topaint=false;
boolean firstpaint=false;
int l,h;
int x0,y0,x1,y1,py,px,nx,ny;
Color col;
Image backBuffer;
Graphics backGC;
public synchronized void init() {
l=size().width;
h=size().height;
}
public void run() {
try {
// Thread.currentThread().setPriority(Thread.MIN_PRIORITY);
backBuffer = createImage(l,h);
backGC = backBuffer.getGraphics();
backGC.setColor(Color.white);
backGC.fillRect(0,0,l,h);
col=Color.red;
alive = true;
} catch(Exception e) {
e.printStackTrace();
alive = false;
}
repaint();
}
public void start() {
if (alive == false ) new Thread(this).start();
}
public void stop() { }
public boolean mouseDown(Event e, int x, int y) {
x0 = x;
y0 = y;
nx = x0;
ny = y0;
px = -1;
py = -1;
topaint=false;
repaint();
return true;
}
public boolean mouseUp(Event e, int x, int y) {
x1 = x;
y1 = y;
topaint=true;
repaint();
return true;
}
public boolean mouseDrag(Event e, int x, int y) {
nx=x;
ny=y;
painted = false;
topaint=false;
repaint();
return true;
}
public void update(Graphics g) {
l=size().width;
h=size().height;
if (backBuffer == null) g.clearRect(0, 0, l, h);
paint(g);
}
public void paint(Graphics g) {
if (alive) {
if(topaint) {
backGC.drawLine(x0,y0,px,py);
//---------------- PROBLEMS HERE
backGC.setPaintMode(); /* Should turn Off the XOR Mode ! -> replace mode */
backGC.setColor(Color.red); /* Should Impose Red for nexts drawings ... */
backGC.drawLine(x0,y0,x1,y1); /* Should draw a red line ?-> Losed : draw a black line ! */
//--------------- But, if you add those lines : you will have the rights colors !
/*
backGC.setColor(Color.blue);
backGC.drawLine(x0+2,y0+2,x1-2,y1-2);
*/
g.drawImage(backBuffer, 0, 0, this);
setPainted();
topaint=false;
}
else {
if((nx != px) || (ny != py)) {
backGC.setXORMode(Color.black);
if((px >= 0) && (py >= 0)) {
backGC.drawLine(x0,y0,px,py);
}
backGC.drawLine(x0,y0,nx,ny);
px = nx;
py = ny;
g.drawImage(backBuffer, 0, 0, this);
setPainted();
}
}
if(! firstpaint){
firstpaint=true;
g.drawImage(backBuffer, 0, 0, this);
setPainted();
}
}
}
private synchronized void setPainted() {
painted = true;
notifyAll();
}
private synchronized void waitPainted() {
try {
while (!painted) wait();
}
catch(Exception e) {
}
painted = false;
}
}
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<html>
<head>
<title>
My Java devs
</title>
</head>
<body>
<applet code="line.class" width=500 height=500>
<param name=nb value=50>
</applet>
</body>
</html>
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