Re: Suggestion on upgrading gwt-2.6.1 to latest

I would not use the scale functionality as it applies to the whole canvas. 

I'd prefer to apply an adapter pattern for determining actual coordinates on the canvas. 

Then you can still have a toolbar, location display or slider for the zoom factor in it's normal proportions and just have the actual content you want to show in a different scale. 

Op donderdag 6 februari 2025 om 13:33:12 UTC+1 schreef Colin Alworth:

No problem - I wanted to be sure I didn't make a mistake, since I haven't myself used canvas "in anger" in many years, and only loosely keep track of resources and advice on it.

SmartGWT's "Draw" examples make the API look very similar to the GXT "draw" packages - it isn't really a raster API at all, but a vector API that just happens to be built on top of a canvas implementation. 

My recollection is that for fewer than around 1k-10k drawn items, SVG is faster and simpler to understand than canvas, and canvas's benefits only start kicking in when the DOM gets too heavy to manipulate quickly each frame. Looking briefly at the example page you shared a few weeks ago, if you were interested in getting into the low level details of how to do the drawing, your case perhaps could stand being remade in plain SVG - always high resolution. The benefits may be mostly for your own understanding rather than any real observed performance improvements from running the page (that said: dropping SmartGWT would appear to drop almost 8mb of JS out of your 9+mb page).

On Wednesday, February 5, 2025 at 9:46:51 PM UTC-6 ne...@propfinancing.com wrote:

> Neil, I'm not sure where I appeared to have said that.

 

I am sorry, I did not intend to put words in your mouth.

That was my understanding from your previous email stating
that  canvas is a raster format.  I misinterpreted your statements.

 

I apologize for that.

 

Thank you,

 Neil

 

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We offer 30 year loans on single family houses!

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