HSB and RGB Example

1 collaborator

Uri Wilensky (Author)

WHAT IS IT?

This is a simple example of NetLogo colors versus RGB colors using approximate-rgb and approximate-hsb, and extract-rgb.

To use it, simply press GO. The top three sliders specify a color in the HSB spectrum which is displayed in the top half of the world, while the bottom three sliders specify a color in the RGB spectrum which is displayed in the bottom half of the world.

The left side of the world is the approximate NetLogo color equivalent to the specified color, the right half of the world is the actual RGB color. The two monitors show the value of the NetLogo color, in the range of 0 to 140, that is actually displayed.

NETLOGO FEATURES

The origin patch (0,0) is in the corner rather than the center, so the dimensions of the patch grid can be even, so the grid can be divided into four equal quadrants.

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Click to Run Model

globals [
  HSB-as-RGB
  HSB-color
  RGB-color
]

to go
  set HSB-as-RGB hsb hue saturation brightness
  set HSB-color approximate-hsb hue saturation brightness
  ask quadrant -1  1 [ set pcolor HSB-as-RGB ]
  ask quadrant  1  1 [ set pcolor HSB-color ]
  set RGB-color approximate-rgb rgb-red rgb-green rgb-blue
  ask quadrant -1 -1 [ set pcolor (list rgb-red rgb-green rgb-blue) ]
  ask quadrant  1 -1 [ set pcolor RGB-color ]
end 

to-report quadrant [x y]  ;; inputs are 1 or -1
  report patches with [patch-quadrant = list x y]
end 

to-report patch-quadrant  ;; patch procedure
  report list ifelse-value (pxcor < world-width / 2) [-1] [1]
              ifelse-value (pycor < world-width / 2) [-1] [1]
end 


; Public Domain:
; To the extent possible under law, Uri Wilensky has waived all
; copyright and related or neighboring rights to this model.

There are 10 versions of this model.

Uploaded by	When	Description	Download
Uri Wilensky	over 12 years ago	Updated to NetLogo 5.0.4	Download this version
Uri Wilensky	almost 13 years ago	Updated version tag	Download this version
Uri Wilensky	over 13 years ago	Updated to NetLogo 5.0	Download this version
Uri Wilensky	about 15 years ago	Updated from NetLogo 4.1	Download this version
Uri Wilensky	about 15 years ago	Updated from NetLogo 4.1	Download this version
Uri Wilensky	about 15 years ago	Updated from NetLogo 4.1	Download this version
Uri Wilensky	about 15 years ago	Updated from NetLogo 4.1	Download this version
Uri Wilensky	about 15 years ago	Model from NetLogo distribution	Download this version
Uri Wilensky	about 15 years ago	HSB and RGB Example	Download this version
Uri Wilensky	about 15 years ago	HSB and RGB Example	Download this version

Attached files

File	Type	Description	Last updated
HSB and RGB Example.png	preview	Preview for 'HSB and RGB Example'	over 12 years ago, by Uri Wilensky	Download

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