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 [email protected] > 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 >> >> >> >> -- >> >> Neil Aggarwal, (972) 834-1565, http://www.propfinancing.com >> >> We offer 30 year loans on single family houses! >> > -- You received this message because you are subscribed to the Google Groups "GWT Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/google-web-toolkit/87f0036e-2bd1-48af-add1-461f21f459f8n%40googlegroups.com.
