[cairo] 回复： 回复： From China: About 2.5D transform
hitiger.2008 at yahoo.com.cn
Mon Oct 10 20:23:47 PDT 2011
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
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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.
> 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
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