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Bug
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Resolution: Duplicate
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P4
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None
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1.4.0
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x86
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windows_2000
Name: jl125535 Date: 02/14/2003
FULL PRODUCT VERSION :
java version "1.4.0"
Java(TM) 2 Runtime Environment, Standard
Java HotSpot(TM) Client VM (build 1.4.0-
Using the following VM in IE seems to work fine:
Java(TM) Plug-in: Version 1.4.1_01
Using JRE version 1.4.1_01 Java HotSpot(TM) Client VM
But since this application is an applet, not all clients may be running the
latest version,
FULL OPERATING SYSTEM VERSION :
Microsoft Windows 2000 [Version 5.00.2195]
A DESCRIPTION OF THE PROBLEM :
The area copied seems to just be raw, rather than the area
as it would have been translated. Haven't checks for
scaling and other rotating.
This happens in the plug-in in IE -- I haven't tested it in
the raw SDK.
STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Code is attached
2.
3.
EXPECTED VERSUS ACTUAL BEHAVIOR :
The copyArea should copy the area specified by the
translated Graphics, but it seems to simply copy the area
as specified in the copyArea call.
This bug can be reproduced always.
---------- BEGIN SOURCE ----------
package placeware.kb.browser.bb211;
import java.applet.*;
import java.awt.*;
/**
* This class will do a copyArea either with or
* without an off-screen buffer.
*/
public class CopyApplet extends Applet {
Image buffer;
Graphics bufGraphics;
public CopyApplet() {}
private boolean getBoolParameter (String name) {
String value = getParameter(name);
if (value == null) return false;
if ("true".equals(value)) return true;
else return false;
}
public void init () {
setLayout(new BorderLayout());
boolean buffer = getBoolParameter("buffer");
add("Center", new CopyCanvas(100, 100, 10, 23, 35, -20, buffer));
}
// The Canvas that draws the funky stuff
class CopyCanvas extends Canvas {
int wCopy;
int hCopy;
int xtrans;
int ytrans;
int xdelta;
int ydelta;
boolean buffer;
CopyCanvas (int wCopy, int hCopy,
int xtrans, int ytrans,
int xdelta, int ydelta,
boolean buffer) {
this.wCopy = wCopy;
this.hCopy = hCopy;
this.xtrans = xtrans;
this.ytrans = ytrans;
this.xdelta = xdelta;
this.ydelta = ydelta;
this.buffer = buffer;
}
public void paint (Graphics g) {
if (buffer)
paintB(g);
else
paintP(g);
}
// The real work
public void paintP (Graphics g) {
Rectangle b = getBounds();
int xcenter = b.width/2;
int ycenter = b.height/2;
int radLimit2 = xcenter*xcenter+ycenter*ycenter;
// Draw a bulls-eye
for (int radius = 10; radius*radius < radLimit2; radius+=10)
g.drawOval(xcenter-radius, ycenter-radius,
2*radius, 2*radius);
// translate, do a copy from the center, translate back
g.translate(xtrans, ytrans);
g.copyArea(xcenter-wCopy/2-xtrans, ycenter-hCopy/2-ytrans,
wCopy, hCopy,
xdelta, ydelta);
g.translate(-xtrans, -ytrans);
// Draw a red box from the source
g.setColor(Color.red);
g.drawRect(xcenter-wCopy/2, ycenter-hCopy/2,
wCopy, hCopy);
// Draw a green box around the destination
g.setColor(Color.green);
g.drawRect(xcenter-wCopy/2+xdelta, ycenter-hCopy/2+ydelta,
wCopy, hCopy);
if (buffer) {
g.setColor(Color.magenta);
g.drawRect(xcenter-wCopy/2-xtrans, ycenter-hCopy/2-ytrans,
wCopy, hCopy);
g.setColor(Color.blue);
g.drawRect(xcenter-wCopy/2+xdelta-xtrans, ycenter-
hCopy/2+ydelta-ytrans,
wCopy, hCopy);
}
}
// Use an off-screen buffer
public void paintB (Graphics g) {
Rectangle b = getBounds();
Image buffer = createImage(b.width, b.height);
System.err.println("buffer "+buffer);
System.err.println("Paint "+g);
Graphics bufG = buffer.getGraphics();
System.err.println("bufG "+bufG);
paintP(bufG);
g.drawImage(buffer, 0, 0, null);
}
}
}
<!--
$Id: //placeware/main/build/placeware.kb.browser/www/bb211/index.html.tmpl#1 $ -
->
<html>
<head>
<title>Browser Bug 211</title>
</head>
<h1>Browser Bug 211</h1>
<h3><a href="../browser-bugs.html#211"><tt>Graphics.copyArea()</tt>
ignores transformations.</a></h3>
[Java Plug-in: Version 1.4.0]
<p>
Each Applet on this page does a copyArea. The source
of the copy is outlined in red, the destination is in green.
The source is centered on the bulls-eye, and the
green area should contain nothing but the middle of
the bulls-eye.
<p>
This applet doesn't use an off-screen buffer. It works
correctly everywhere. [Note however that damaging it with
another window will cause redraws that it isn't ready to
deal with.]
<p>
<applet code="placeware.kb.browser.bb211.CopyApplet"
codebase="%codebase%"
width=200 height=200
>
</applet>
<br>
This applet uses an off-screen buffer. In some browsers, the
copyArea doesn't take into account the translation
in effect in the off-screen Graphics. In that case, the
destination of the copy will be the blue rectangle
instead, and the source will be the magenta rectangle.
<p>
<applet code="placeware.kb.browser.bb211.CopyApplet"
codebase="%codebase%"
width=200 height=200
>
<param name="buffer" value="true">
</applet>
</html>
---------- END SOURCE ----------
CUSTOMER WORKAROUND :
Keep track of the translations that have been applied,
apply the inverse just before the copyArea call [so that on
ALL browsers the current transformation will be the
identity] then call copyArea, then re-apply the
transformation.
(Review ID: 144771)
======================================================================
- duplicates
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- Closed
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