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colorpicker [2010/06/22 05:44] (current)
jochen created
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 +====== colorpicker ======
 +===== Motivation =====
 +As part of a toolbox with a GUI that supports statistical map overlay, I wanted to have a nice interface to select (pick) colors. Most programs (e.g. Photoshop) have a comparable option.
 +===== Function reference ('help colorpicker'​) =====
 +<​file> ​ colorpicker ​ - pick a color from the RGB/HSV color space
 +  FORMAT: ​      color = colorpicker([icolor [, icnames]]);
 +  Input fields:
 +        icolor ​     initial color or colors (default: [0, 0, 0]);
 +        icnames ​    color name(s) (labels)
 +  Output fields:
 +        color       Cx3 RGB color (values in the [0...255] range)</​file>​
 +===== GUI layout and functionality =====
 +The general layout is always the same and looks like this:
 +{{:​colorpicker_singlecolor.png|colorpicker with a single color}}
 +Each of the five areas showing a color-gradient is click-sensitive,​ which means that by clicking at a given position, the color will change to the color below the mouse cursor.
 +Additionally,​ colors can be coded either in the HSV or RGB color space (with a scaling of ''​[0 .. 255]''​ for each value).
 +The buttons on the lower right side will
 +  * reset the color to the values given at call time (Reset)
 +  * close the dialog without altering the values given at call time (Cancel)
 +  * close the dialog and return the colors as they were displayed at the time (Accept)
 +If multiple colors are to be shown (e.g. a palette), names can be given and instead of one uni-colored patch in the top right corner, a grid of colors is presented, which itself is click-sensitive to switch between colors:
 +{{:​colorpicker_palette.png|colorpicker with a palette of colors (colormap '​hot'​)}}
 +===== Notes =====
 +This function requires the [[xfigure]] class to be working properly!
colorpicker.txt ยท Last modified: 2010/06/22 05:44 by jochen