Drawing image flipped

Java 2D
#1

Is it proper to draw an image with a negative width/height in order to flip it.

I’m asking because it’s working on my machine and anyother windows machine I’ve tried it on. But it’s not really a part of any documentation that I’ve seen or even a tutorial(that I remember). Which means that I’m curious if it’s something that will work the same on every system, or just some strange OS/Hardware behavior semi-unique to the 3 computers I’ve tried it on.

#2

yeah why not, you can rotate an image negative, so why not draw it negative. If it works then it works. there might be better methods though.

#3

I have no idea if that’s “bad,” but I’ve never heard of anyone doing it and because yours is counter-intuitive (and probably abuses a bug) it’s probably better to use the “correct” method.

g.drawImage with source and destination vertices.

Basically you do this:


//Flipped horizontal
g.drawImage(myImage, x, y, x+width, y+height, x+width, y, x, y+height, null);
//Flipped vertical
g.drawImage(myImage, x, y, x+width, y+height, x, y+height, x+width, y, null);
//Flipped both
g.drawImage(myImage, x, y, x+width, y+height, x+width, y+height, x, y, null);
#4

Have a look here : Flip and draw an image by graphics.drawImage(…): Any issues known? http://forums.java.net/jive/thread.jspa?threadID=57788&tstart=45

August

#5

Its okay to do so. Drawing an image with negative width or height does a mirror effect, which is not equal to a rotation.

-JAW