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List:       opennms-discuss
Subject:    Re: [opennms-discuss] Transparency in AREA
From:       Ronald Roskens <ronald.roskens () biworldwide ! com>
Date:       2012-10-23 4:28:43
Message-ID: 50861CFB.9010400 () biworldwide ! com
[Download RAW message or body]

Hmm. So its not quite as simple as I though.

First, JRobin needs a 1 line patch so that it generates graphs with an 
alpha channel. (JRB-21).

Second, the alpha channel has to be at the start (ARGB) rather than the 
end (RGBA). So its more of:

     private Color getColor(final String colorValue) {
         int rVal = Integer.parseInt(colorValue.substring(0, 2), 16);
         int gVal = Integer.parseInt(colorValue.substring(2, 4), 16);
         int bVal = Integer.parseInt(colorValue.substring(4, 6), 16);
         if (colorValue.length() == 6) {
             return new Color(rVal, gVal, bVal);
         }

         int aVal = Integer.parseInt(colorValue.substring(6, 8), 16);
         return new Color(rVal, gVal, bVal, aVal);
     }

Ron

On 10/22/2012 5:29 PM, Roskens, Ronald wrote:
> I just want to pipe in here and say that JRobin does support alpha channels for \
> colors, just that the JRobinRrdStrategy doesn't support it. And from the looks of \
> it, it shouldn't take much effort to support it. 
> 	return new Color(colorVal, colorValue.length() == 8);
> 
> Ron
> 
> -----Original Message-----
> From: Markus Neumann [mailto:Markus@OpenNMS.com]
> Sent: Monday, October 22, 2012 7:57 AM
> To: General OpenNMS Discussion
> Subject: Re: [opennms-discuss] Transparency in AREA
> 
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> Am Mo 22 Okt 2012 14:51:28 CEST schrieb Samuel Mutel:
> > Hello,
> > 
> > How can I do to create a transparency area (75% for example) in graphs ?
> > 
> > Thanks in advance.
> > Regards,
> > Samuel Mutel.
> > 
> > ----------------------------------------------------------------------
> > -------- Everyone hates slow websites. So do we.
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> 
> Hey Samuel,
> 
> transparency is just supported in RrdTool not in JRobin (what is running by default \
> in OpenNMS). In RrdTool you can add transparency as additional value for the color.
> If you are using JRobin, transparency is not an option.
> 
> Regards,
> 
> Markus
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> 
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> Everyone hates slow websites. So do we.
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> Download AppDynamics Lite for free today:
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Everyone hates slow websites. So do we.
Make your web apps faster with AppDynamics
Download AppDynamics Lite for free today:
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