Rubber Band Box Over Tiff

[Mike]

I am trying to create a rubber band box over a tiff image. I am
currently using a tiledimage and also using getGraphics(). I can get
the rectangle to be drawn with the mouse, but I cannot get the
previous lines to erase, so eventually the screen will all turn black
if I keep moving the mouse around. I can redraw the lines in
white.... but how do I redraw them with the actual image?

Thank you in advance.

 

[Michael Borgwardt]

I am trying to create a rubber band box over a tiff image. I am
currently using a tiledimage and also using getGraphics(). I can get
the rectangle to be drawn with the mouse, but I cannot get the
previous lines to erase, so eventually the screen will all turn black
if I keep moving the mouse around. I can redraw the lines in
white.... but how do I redraw them with the actual image?

Assuming that you're using Swing:
Don't draw the box directly on the image, draw it on an otherwise
transparent component on top, i.e. use a JLayeredPane or (if
the layout is simple enough) the GlassPane of the JFrame.

 

[ak]

I can get

the rectangle to be drawn with the mouse, but I cannot get the
previous lines to erase, so eventually the screen will all turn black
if I keep moving the mouse around. I can redraw the lines in
white.... but how do I redraw them with the actual image?

g.setXORMode(Color c);

every line/rect must be painted _twice_.
when mouse moves, you first paint your last rect, then new rect. and so
on...