How to use wxGraphicContext to draw on a wxBitmap?

[Parduz]

I'm building a component which shows a vertical bar chart, using wxGraphicContext to get a nice antialiasing.

The "draft" works, but it needs some optimization. One of them is to draw the fixed part of the chart (axis, labels, grid, etc) on a bitmap each time the component changes size, and then always using that bitmap as a background and redraw only the bars when needed.

chart.jpg (45.75 KiB) Viewed 276 times

What i don't get is how to use wxGraphicContext to draw on a bitmap.

Could i get a little code showing how to do so?

[doublemax]

https://docs.wxwidgets.org/trunk/classw ... 2dc0686e2e

FWIW: When the background has only little content, i don't think this optimization is worth the effort (yet).

[Parduz]

https://docs.wxwidgets.org/trunk/classw ... 2dc0686e2e

Oh... that's the way. Thanks.

FWIW: When the background has only little content, i don't think this optimization is worth the effort (yet).

Well, the bars needs to be updated the fastest i can, and the program will run on an embedded linux PC, so not a really fast machine: i don't have yet a comparison, but i think that drawing that background (and computing each line and label position) at each refresh takes some relevant time.