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Asked: 2026-05-24T16:44:06+00:00

In my application I need to draw a large network (basically, little boxes connected

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In my application I need to draw a large network (basically, little boxes connected with lines) and the user will be able to zoom and pan it around.

My first option was to draw the network directly to the canvas, but I thought that was not very efficient, because each time a pan event occurs, the drawing process begins again.

So I tried to use a large mutable bitmap and draw my entire network only once (or at least whenever zoom occurs), and blit the necessary areas to the canvas.

My problem is, since the network is rather big, I get OOM exception when creating the bitmap…

What should I do? Draw directly to the canvas? Use several smaller bitmaps?

Thanks,
Direz

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1 Answer

  1. Editorial Team

    You’re probably not going to like this, but if all you’re doing is drawing boxes and lines, the efficiency of the canvas is going to be pretty dang high. Are you getting UI lag or something?

    One thing I have messed around with is drawing collections of subcomponents that won’t change much or at all to a bitmap then rendering (scaling/moving aren’t all that expensive if done at the right level) to the canvas can help efficiency. I have tried in the past to create a framework for rendering a tile-like subset of an existing larger image, but did not meet much success. I’ve made things work, but the code just gets ugly.

    Oh, also a quick test to see if the component you are rendering is within the rectangle created by the screen can save you a bunch of processor time.

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