how to How to improve the effect of wxDc drawing circle

[Ellan]

Hi，
WxDc draw circle, the edge of this circle is serrated, what can I do to eliminate the sawtooth？

[doublemax]

Assuming you're under Windows, you'll need to use wxGraphicsContext, it supports anti-aliasing:
http://docs.wxwidgets.org/trunk/classwx ... ntext.html

If you already have a lot of code based on wxDC, you can use wxGCDC which is a wrapper around wxGraphicsContext with a wxDC-compatible API:
http://docs.wxwidgets.org/trunk/classwx_g_c_d_c.html

[Ellan]

Assuming you're under Windows, you'll need to use wxGraphicsContext, it supports anti-aliasing:
http://docs.wxwidgets.org/trunk/classwx ... ntext.html

If you already have a lot of code based on wxDC, you can use wxGCDC which is a wrapper around wxGraphicsContext with a wxDC-compatible API:
http://docs.wxwidgets.org/trunk/classwx_g_c_d_c.html

the wxGraphicsContext drawing line works very well, but drawBitmap is the same as the sawtooth effect of wxDc

[doublemax]

the wxGraphicsContext drawing line works very well, but drawBitmap is the same as the sawtooth effect of wxDc

Do you scale the bitmap? How?

Experiment with wxGraphicsContext::SetInterpolationQuality()
http://docs.wxwidgets.org/trunk/classwx ... c285d01b91

[Ellan]

the wxGraphicsContext drawing line works very well, but drawBitmap is the same as the sawtooth effect of wxDc

Do you scale the bitmap? How?

Experiment with wxGraphicsContext::SetInterpolationQuality()
http://docs.wxwidgets.org/trunk/classwx ... c285d01b91

It shows the original image, not zooming

[doublemax]

It shows the original image, not zooming

Then the result is expected. If the image is pixelated before, wxGraphicsContect won't "fix" it.

Can you show a screenshot?

[Ellan]

It shows the original image, not zooming

Then the result is expected. If the image is pixelated before, wxGraphicsContect won't "fix" it.

Can you show a screenshot?

The effect of the wxDc and wxGc is that, like the ICONS in the attachment, it looks like the sawtooth is obvious.

[doublemax]

It's hard for me to tell what's graphic and what's text. The only thing that looks a little strange is the paperclip. Everything else looks normal to me.