[2723] in java-interest
drawing a line in a graphics window
daemon@ATHENA.MIT.EDU (Sharma V R Madiraju)
Wed Oct 11 22:14:42 1995
From: Sharma V R Madiraju <sharma@lochard.com.au>
To: java-interest@java.sun.com
Date: Thu, 12 Oct 1995 10:42:35 +1000 (EST)
This may be a stupid question for java 'gurus' but this is a real
problem for me.
I am trying to draw a line and grab events in a graphics window
(GWindow) which is derived from Window class. This window is
initialised in Ex class constructor and this (Ex) is derived from
a frame class. I could see stdout messages (event handling) when
I move the mouse in the window. I could see paint() is called but
the line is not appearing in the window.
The code is like this
======
import awt.*;
import java.lang.*;
import java.io.*;
import java.util.*;
public class Ex extends Frame {
static WServer server = null;
public static int windowWidth = 300;
public static int windowHeight = 300;
GWindow gwindow;
public Ex(WServer serv, String args[]) {
super(serv,false,null,windowWidth,windowHeight,Color.lightGray);
setInsets(4,0,4,0);
serv.sync();
String str = new String("abc");
gwindow = new GWindow (this,str,300,300);
map();
}
public static void main( String args[]) {
server = new WServer();
server.start();
Ex mp = new Ex(server,args);
}
}
class GWindow extends Window{
Event tEvent = new Event();
Graphics gwgraphics;
public GWindow (Frame fr, String str, int ht, int wt ) {
super(fr, str, Color.white, 300,300);
super.handleExpose(0,0,300,300);
enablePointerMotionEvents();
setMargin(2);
setLayout(null);
}
public void mouseMoved(Event e)
{
System.out.println("Moise Moved points" + e.x +" " + e.y);
}
public void mouseDrag(Event e) {
System.out.println("Mouse Drag points" + e.x +" " + e.y);
}
public void mouseUp(Event e) {
System.out.println("Mouse Up" + e.x +" " + e.y);
}
public void mouseDown(Event e) {
System.out.println("mouse Down" + e.x +" " + e.y);
}
public void mouseExit(Event e) {
System.out.println("mouse exit");
}
public void mouseEnter(Event e) {
System.out.println("mouse enter");
}
public void expose(int x, int y, int w, int h) {
paint();
}
public void paint(){
System.out.println("drawing line");
drawLine (10,10,200,100);
}
}
======
Can you please tell me what the problem is.
I am also looking for ftp sites for java application examples
similar to above (graphics, etc).
Thanks very much
Sharma Madiraju
--
sharma@lochard.com.au Lochard Environment Systems
http://www.cs.mu.oz.au/~madiraju 875 Glenhuntly Road
Tel (613) 524 3908 Caulfield South, VIC 3162
Fax (613) 532 8209 Australia
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