Two overlayed painting areas

I'm trying to implement Canvas with axes, which allows zooming by mouse dragging. But when I'm painting the zooming rectangle, it's neccesary to repaint the whole Canvas in each mouseDragged event. It causes blinking. Is possible to overlay two painting areas, one for my graphs and second for zooming rectangle (which should only be repainted when mouse dragged) ???
Thank you very much
Cechyn

Two things come to mind
With repaint(x, y, w, h) you will restrict the subsequent call to paint() to that area. Any drawing that paint() does outside of that area will be clipped. So when you decide to zoom, set the zoom param and call reapint() on just the zoom rect. See also Graphics.getClip() and Graphics.clipRect
- or -
Implment your component as a Container with two sub-components, one for each painting area. This seems the more OO

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