Re: continued problem:How to get the color of a pixel(x, y) on the window?

From: Daniel Elstner <daniel kitta googlemail com>
To: chunlong84 <chunlong84 gmail com>
Cc: "gtkmm-list gnome org" <gtkmm-list gnome org>
Subject: Re: continued problem:How to get the color of a pixel(x, y) on the window?
Date: Wed, 10 Jun 2009 01:17:43 +0200

Am Dienstag, den 09.06.2009, 16:02 +0800 schrieb chunlong84:

> cr->set_source_rgb(65535,65535,65535);    //paint the background of the canvas

Cairo uses normalized floating point values for color components. That
is, 0.0 is the lowest intensity and 1.0 the highest.

> cr->set_source_rgb(red,green,blue);    //draw line,it's color get from the pixel of above png picture

Same here.

--Daniel

References:
- continued problem:How to get the color of a pixel(x, y) on the window?
  - From: chunlong84

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