swing - Trouble drawing with MouseDragged in Java -

there's problem drawing or setting size of jpanel when drag mouse, location setted click , size depending of drag position(x , y) drawing resizable rectangle(jpanel).

private void panelmousedragged(java.awt.event.mouseevent evt) {                                        rsx = (int)mouseinfo.getpointerinfo().getlocation().getx();     rsy = (int)mouseinfo.getpointerinfo().getlocation().gety();     rectangulodefault.setbounds(rx,ry,rsx-rx,rsy-ry); }                                    private void panelmousepressed(java.awt.event.mouseevent evt) {                                        rx = (int)mouseinfo.getpointerinfo().getlocation().getx();     ry = (int)mouseinfo.getpointerinfo().getlocation().gety();     rectangulodefault.setlocation(rx,ry); }        

but when drag mouse in negative coordinate of click(start of drawing) disappear.

here better explain http://i.picasion.com/resize80/49c88c55d4c11c53c020acfcc4fc2f45.png

but when drag mouse in negative coordinate

 rectangulodefault.setbounds(rx,ry,rsx-rx,rsy-ry); 

your width/height calculation assumes drag mouse in positive direction.

you need use absolute value of 2 points:

int width = math.abs(rsx - rx); int height = math.abs(rsy - ry); rectangulodefault.setbounds(rx, ry, width, height); 

your x/y values need minimum of (rx , rsx) , (ry , rsy). can use math.min(...) method this.