Re: Repainting a canvas - clear or create new object?

Could you post the code where you stack the layers?
Because as I wrote in, my 2 canvsa layers appear one below the other, not behind each other!

So both layers are visible at a time. What's wrong with the code example I posted?

2013/4/10 Thad <thad.humphries@gmail.com>

If you don't want the lower layer to show through, you need to fill the upper layer with an opaque (alpha 1.0) color.

The transparency of canvas is a good think at least for one of my apps. I have three Canvas, all stacked in an AbsolutePanel. The lowest Canvas holds an image (a PNG that was converted on the server from a scanned TIFF). The next layer holds objects the user has drawn on the Canvas. The top-most layer is the interactive drawing layer, where I track mouse down, move, and up. (There's also a fourth Canvas that is not on screen. I use this for testing if clicks on the AbsolutePanel are clicks on a current object.)

On Wednesday, April 10, 2013 6:01:58 AM UTC-4, membersound wrote:

How do you stack multiple canvas onto each other?
I tried the following, which only placed them below each other so that both are visible at a time.

        .layer1 {
            z-index: 1;
            left: 0;
            top: 0;
        }
        .layer2 {
            z-index: 0;
            left: 0;
            top: 0;
        }

                <gwt:AbsolutePanel>
                    <c:Canvas styleName="{style.layer1}" />
                    <c:Canvas styleName="{style.layer2}" />
                </gwt:AbsolutePanel>

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