gtk中的alpha混合 [英] alpha blending in gtk

问题描述

你如何绘制半透明基元（如填充多边形）添加到GTK中的Drawable中？

其2010年，我google没有找到如何将alpha值放入颜色为了我。我缺少什么？

解决方案

使用 gtk.gdk.Drawable.cairo_create（）并对返回的 gtk.gdk.CairoContext 进行操作。请参阅文档。开罗是一个通用的矢量2D库，它在很多版本之前就已经在GTK +中使用; GDK绘图原语被弃用（尽管不是整个GDK）。

How can you draw semi-transparent primitives such as filled polygons to a Drawable in GTK?

Its 2010, and I google isn't finding how to put an alpha value into a colour for me. What am I missing?

解决方案

Use gtk.gdk.Drawable.cairo_create() and operate on the returned gtk.gdk.CairoContext. See documentation. Cairo is a generic vector 2D library that is used in GTK+ since many versions ago; GDK drawing primitives are deprecated in its favor (though not the whole GDK).

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