ProCodeMyth wrote at 2012-08-15 10:33:
i need draw 10000-20000 rectangles (color fill) in my wpf appliction (similar pixel in bitmap ).
the app will became slow , there is a good solution for draw-heavy appliction.
i find oxyplotwpf render graphic in ShapesRenderContext, it perform well when plot element
count is little, i want to try use drawingRenderContex instead of shapsrenderContex, but i have not success. anyone can help me, thanks in advance
objo wrote at 2012-08-21 13:27:
I did not see any significant performance improvement in the DrawingRenderContext, so this code was just left there in case it should be reviewed again.
I guess you want to plot heat maps? I think it is necessary to support bitmaps in the IRenderContext to get good performance for those. See http://oxyplot.codeplex.com/workitem/9801
ProCodeMyth wrote at 2012-08-23 02:22:
very thank objo,
your guess is exactly what i want to do, i recently study geogological map , i need fill many fill rectangles with color which represent lith info, so i need an way to quick draw , bitmap buffer(bitmap render) is an great idea, but in wpf i dont know how to implement , WriteableBitmap may help me .
objo wrote at 2012-08-23 08:53:
In WPF it should be easy to implement a heat map using BitmapSource.Create. I think this will have better performance than drawing on a WriteableBitmap. Create a 256-color palette and a pixel array (scaled to 8-bit) from your lithology data. Wrap the image in a WPF ScrollViewer and use a WPF scale transform if you want to zoom in/out!
ProCodeMyth wrote at 2012-08-23 11:37:
the problem now i face is i hope that i can using BitmapSource in oxyplot system, using exist function of oxyplot,if i rewritte my code without help of oxyplot ,it is very difficult for me , i have to rewrite coord tranform and many ether function .
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