[2633] in java-interest
Q: awt.Graphics translate() and scale() methods
daemon@ATHENA.MIT.EDU (Leslie Picardo)
Sat Oct 7 15:18:59 1995
Date: Sat, 7 Oct 1995 13:04:33 -0400
From: Leslie Picardo <picardo@alpha.CES.CWRU.Edu>
To: java-interest@java.sun.com
Reply-to: picardo@alpha.CES.CWRU.Edu
Re: preBeta JDK using appletviewer
Q: I'm creating an applet in which I'd like to use a normal
cartesian coordinate system to do my graphics drawing instead
of the default window coordinate system. The awt.Graphics.translate()
method works fine and allows me to reposition the origin but the
awt.Graphics.scale() function only seems to work for positive
values. I want to flip the coordinate system so that the y-axis is
positive upwards. How do I do that ?
eg:
. . .
public paint(Graphics g){
// put origin at center of applet
g.translate( size().width/2, size().height/2 );
// try to flip the coordinate system so that y-axis is +ve up
g.scale((float) 1, (float) -1);
// ...................^^^^^^^
//This screws up subsequent graphics operations
}
If I use positive values for the scale(sx, sy) method it works fine
but my coordinate system is upside down which I don't like.
Leslie Picardo
picardo@alpha.ces.cwru.edu
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