> *I would not use the scale functionality as it applies to the whole canvas. *
Whatever works for your project is best, however, the scale only applies when you set it. And you can always reset it. Eg: // Save the current state context2d.save(); // Apply zoom context2d.scale(xxx, xxx); // Draw zoomed stuff ... // Reset the zoom context2d.restore(); This also lets browsers use the GPU to render (although, I'm not actually sure if the scaling is done on the CPU or the GPU). On Friday, 7 February 2025 at 5:02:17 pm UTC+11 Leon Pennings wrote: > 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/6e8eda4e-0e45-4d69-9ee8-4c6c1ae9fb2an%40googlegroups.com.
