What does Color(1-4) mean?
7 views (last 30 days)
Show older comments
Cliff Karlsson
on 17 Sep 2018
Answered: Walter Roberson
on 17 Sep 2018
When trying to set alpha for lines in a parallelcoords-plot I stumbled on the command:
lineobject(i).Color(4) = 0.5;
It works but I don't understand what the number "4" means? When trying different inputs I noticed that Colors accepts integers in the range 1-4 and 1-3 looks to be specific hues of red, green and blue. But what does "4" mean and why do I have to specify Color(4) to be able to set the alpha?
0 Comments
Accepted Answer
Walter Roberson
on 17 Sep 2018
Those particular kind of graphics object accept a color specification which is in the form of a four element vector of doubles in the range 0 to 1. The elements are in the order R G B A. So Color(1) would be the red component, (2) would be the green component, (3) would be the blue component, and (4) is the alpha component.
Depending on the kind of graphics object, the fact that it accepts alpha components might not be documented.
Also, a number of the graphics objects that are not documented as accepting alpha expect uint8 values for the RGBA specification.
0 Comments
More Answers (0)
See Also
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!