Comments on: Drawable Canvas

By: Jason

Jason — Mon, 09 Feb 2009 16:13:22 +0000

Found a problem of the drawn lines “bleeding” through outside its canvas.
Draw something near the edge of the thing, then resize your browser, the lines will somehow go outside…

By: Tony Fendall

Tony Fendall — Tue, 27 Jan 2009 00:46:24 +0000

You would need to store the line color in the array of lines also (one color for each line), and then use this value when drawing the lines

By: rajnish

rajnish — Sun, 25 Jan 2009 21:38:28 +0000

if I draw ten lines and each line has different color then what should I do.because if I dynamically change the line color, the color of all lines get changed.

By: Ansury

Ansury — Wed, 17 Sep 2008 22:19:34 +0000

This isn’t 100% true:

“You can’t assign event listeners to a component from inside itself. Ie. this.addEventListener(MouseEvent.MOUSE_DOWN, mouseDown) doesnt work.”

You definitely can in at least some cases. Maybe it’s specifically when we’re talking Canvases? You can definitely do it at the Application tag level.

By: Anggie Bratadinata

Anggie Bratadinata — Sat, 08 Mar 2008 08:21:13 +0000

Great stuff! Thanks!

By: Dharam vir

Dharam vir — Fri, 28 Dec 2007 13:59:26 +0000

If I remove the backgroundColor property from the DrawableCanvas, it stops drawing new lines after some time. However it draws the line if I start the new line from a point over any existing line. I can’t figure out how could this happen by removing backgroundColor. Any suggestions??

By: Marco Di Bartolomeo

Marco Di Bartolomeo — Thu, 25 Oct 2007 21:29:27 +0000

I removed the limit in my custom program but it get horribly slow after a bunch of lines Tony knew what he was doing.
It’s a problem related to the vectorial nature of the lines. I think that bitmap drawing is the way… however actionscript haven’t api functions to do this. Maybe one could draw vector lines and periodically save a bitmap image of the whiteboard, cleaning all the vector data. I don’t know and haven’t enough time to study it at the moment.

By: Tony Fendall

Tony Fendall — Fri, 19 Oct 2007 00:20:21 +0000

Yes, I limit the number of lines to 10. There’s no reason why it has to be that way. I just added a limit out of habbit

By: Lorenzo100

Lorenzo100 — Thu, 18 Oct 2007 20:27:08 +0000

hi,

I’m not a developer, but I experienced a bug : after a certain number of lines, each new lin makes an old one disappear (is there a limitation ?) – FF 2.0.0.7 running on WIn XP

that’s all.

good luck

By: Tony Fendall

Tony Fendall — Sat, 08 Sep 2007 23:13:57 +0000

I’m running the latest version of the Flash Player, and I can’t seem to replicate the bug.

Thanks for your comment though!