<html><body><div style="color:#000; background-color:#fff; font-family:verdana, helvetica, sans-serif;font-size:12pt"><div>im intrested in this too, but failed to achieve it...</div><div>i think the only way is using the correct values as parameters when creating a matrix. </div><div> </div><div>Jerónimo Barraco Mármol </div><div>http://nande.com.ar http://ar.linkedin.com/in/nande <div style='font-size: 12pt; font-family: "verdana", "helvetica", sans-serif'><div style='font-size: 12pt; font-family: "times new roman", "new york", "times", serif'><hr size="1">De: 唐博 <hitiger.2008@yahoo.com.cn> Para: Maarten Bosmans <mkbosmans@gmail.com> CC: "cairo@cairographics.org" <cairo@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 <<a ymailto="mailto:mkbosmans@gmail.com" href="mailto:mkbosmans@gmail.com">mkbosmans@gmail.com</a>> 收件人：唐博 <<a ymailto="mailto:hitiger.2008@yahoo.com.cn" href="mailto:hitiger.2008@yahoo.com.cn">hitiger.2008@yahoo.com.cn</a>> <a ymailto="mailto:cairo@cairographics.org" href="mailto:cairo@cairographics.org">cairo@cairographics.org</a> 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 <<a ymailto="mailto:hitiger.2008@yahoo.com.cn" href="mailto:hitiger.2008@yahoo.com.cn">hitiger.2008@yahoo.com.cn</a>>: > 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. <a href="http://lists.freedesktop.org/archives/cairo/2010-August/020458.html" target="_blank">http://lists.freedesktop.org/archives/cairo/2010-August/020458.html</a> 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. Maarten > ----- 原邮件 ----- > 发件人： Maarten Bosmans <<a ymailto="mailto:mkbosmans@gmail.com" href="mailto:mkbosmans@gmail.com">mkbosmans@gmail.com</a>> > 收件人：唐博 <<a ymailto="mailto:hitiger.2008@yahoo.com.cn" href="mailto:hitiger.2008@yahoo.com.cn">hitiger.2008@yahoo.com.cn</a>> > 抄送： "<a ymailto="mailto:cairo@cairographics.org" href="mailto:cairo@cairographics.org">cairo@cairographics.org</a>" <<a ymailto="mailto:cairo@cairographics.org" href="mailto:cairo@cairographics.org">cairo@cairographics.org</a>> > 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 <<a ymailto="mailto:hitiger.2008@yahoo.com.cn" href="mailto:hitiger.2008@yahoo.com.cn">hitiger.2008@yahoo.com.cn</a>>: >> 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. > > <a href="http://cairographics.org/manual/cairo-Transformations.html" target="_blank">http://cairographics.org/manual/cairo-Transformations.html</a> > > 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 > 抄送： -- cairo mailing list <a ymailto="mailto:cairo@cairographics.org" href="mailto:cairo@cairographics.org">cairo@cairographics.org</a> <a href="http://lists.cairographics.org/mailman/listinfo/cairo" target="_blank">http://lists.cairographics.org/mailman/listinfo/cairo</a> </div></div></div></div></body></html>