[cairo] 回复: 回复: From China: About 2.5D transform

Jerónimo Barraco Mármol jerobarraco at yahoo.com.ar
Tue Oct 11 06:05:43 PDT 2011

im intrested in this too, but failed to achieve it...

i think the only way is using the correct values as parameters when creating a matrix.

Jerónimo Barraco Mármol


De: 唐博 <hitiger.2008 at yahoo.com.cn>
Para: Maarten Bosmans <mkbosmans at gmail.com>
CC: "cairo at cairographics.org" <cairo at cairographics.org>
Enviado: martes, 11 de octubre de 2011 0:23
Asunto: [cairo] 回复: 回复:  From China: About 2.5D transform

Oh, it's the first time I send email to mailing list. I 'm not familiar with it, excuse me.

----- 原邮件 ----
发件人: Maarten Bosmans <mkbosmans at gmail.com>
收件人: 唐博 <hitiger.2008 at yahoo.com.cn>
cairo at cairographics.org
发送日期: 2011年10月10日, 星期一, 上午 2:20
主题: Re: 回复: [cairo] From China: About 2.5D transform

Note: Please keep the conversation on the mailing list. (use reply-to-all)

Also inline answering instead of top posting is preferred.

2011/10/9 唐博 <hitiger.2008 at yahoo.com.cn>:
> Thank you very much!
> I want to transform the image rotate as the Z axis. And achieve overlook effect .I don't know whether cairo support .

This is indeed projective transform. I wouldn't call this 2.5D.

A year ago I strarted of a discussion about this.
Please read through it and the patches I proposed. Perhaps you would
like to put in some effort to bring projective transforms to Cairo,
that would be much appreciated.


> ----- 原邮件 -----
> 发件人: Maarten Bosmans <mkbosmans at gmail.com>
> 收件人: 唐博 <hitiger.2008 at yahoo.com.cn>
> 抄送: "cairo at cairographics.org" <cairo at cairographics.org>
> 发送日期: 2011年10月9日, 星期日, 下午 6:49
> 主题: Re: [cairo] From China: About 2.5D transform
> 2011/10/9 唐博 <hitiger.2008 at yahoo.com.cn>:
>> Good afternoon:
>>     How can I use cairo lib achieve 2.5D effect ?
> Can you explain what you want to achieve in more detail?
> With 2.5D I always understood having multiple flat layers stacked on
> top of eachother. This is of course exactly what Cairo does.
>> I want to use affine transform, but I don't know how to set the matrix's param.
> http://cairographics.org/manual/cairo-Transformations.html
> If you want a perspective transform (which is not affine), then that's
> currently not possible to do with Cairo. It is possible in pixman and
> I proposed some patches to cairo to expose that functionality, but
> those where met with complaints about the API. I haven't revisited
> those.
> Maarten


cairo mailing list
cairo at cairographics.org
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.cairographics.org/archives/cairo/attachments/20111011/c1f1b78e/attachment-0001.htm>

More information about the cairo mailing list