49 lines
1.2 KiB
Scheme
49 lines
1.2 KiB
Scheme
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;; Author: David Frese
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;; r,g,b should be values between 0.0 to 1.0 inclusive.
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(define (make-color r g b)
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(create-color (floor (* r 65535))
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(floor (* g 65535))
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(floor (* b 65535))))
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(define (color-rgb-values color)
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(map (lambda (x)
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(/ x 65535)) ;; exact<->inexact?
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(extract-rgb-values color)))
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;; ...
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(define (query-color colormap pixel)
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(apply create-color
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(%query-color (colormap-Xcolormap colormap)
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(pixel-Xpixel pixel)
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(display-Xdisplay (colormap-display colormap)))))
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(import-lambda-definiton %query-color (Xcolormap Xpixel Xdisplay)
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"Query_Color")
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;; ...
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(define (query-colors colormap pixels)
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(list->vector
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(map (lambda (pixel)
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(query-color colormap pixel))
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(vector->list pixels))))
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;; ...
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(define (lookup-color colormap color-name)
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(let ((r (%lookup-color (colormap-Xcolormap colormap)
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(display-Xdisplay (colormap-display colormap))
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(if (symbol? color-name)
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(symbol->string color-name)
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color-name))))
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(if r
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(cons (apply create-color (car r))
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(apply create-color (cdr r)))
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(error "no such color:" color-name))))
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(import-lambda-definiton %lookup-color (Xcolormap Xdisplay)
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"Lookup_Color")
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