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175 lines
4.5 KiB
175 lines
4.5 KiB
{ |
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"description" : "", |
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"digest" : "", |
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"tags" : "", |
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"style" : "", |
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"boxes" : [ { |
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"box" : { |
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"id" : "obj-11", |
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"text" : "Original cubehelix implementation from: Green, D. A., 2011, ‘A colour scheme for the display of astronomical intensity images’, Bulletin of the Astronomical Society of India, 39, 289.\n(2011BASI...39..289G at ADS.): https://www.mrao.cam.ac.uk/~dag/CUBEHELIX/" |
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} |
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} |
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, { |
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"box" : { |
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"text" : "Below implementation based on D3 implementation by @mbostock https://github.com/d3/d3-plugins/tree/master/cubehelix" |
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} |
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} |
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"patching_rect" : [ 220.0, 47.0, 406.0, 62.0 ], |
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"text" : "Default values are meant to reproduce the default cubehelix color scheme.\nhue_offset is here to shift common Max hue values (with 0 as red) by 120° and make them work with the cubehelix algorithm (made to work with 0 as blue)." |
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} |
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} |
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"outlettype" : [ "" ], |
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"patching_rect" : [ 50.0, 47.0, 155.0, 22.0 ], |
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"text" : "param hue_offset 0.333333" |
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} |
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} |
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, { |
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"box" : { |
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"id" : "obj-3", |
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"outlettype" : [ "" ], |
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"patching_rect" : [ 304.0, 5.0, 203.0, 22.0 ], |
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"text" : "param color_end -0.666666 0.5 1. 1." |
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} |
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} |
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, { |
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"box" : { |
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"id" : "obj-2", |
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"patching_rect" : [ 92.0, 5.0, 202.0, 22.0 ], |
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"text" : "param color_start 0.888888 0.5 0. 1." |
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} |
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} |
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, { |
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"box" : { |
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"code" : "h_s = (color_start.x + hue_offset) * TWOPI;\r\nh_e = (color_end.x + hue_offset) * TWOPI - h_s;\r\ns_s = color_start.y;\r\ns_e = color_end.y - s_s;\r\nl_s = color_start.z;\r\nl_e = color_end.z - l_s;\r\n\r\n\r\nh = h_s + h_e * norm;\r\nl = pow(l_s + l_e * norm, gamma);\r\na = (s_s + s_e * norm) * l * (1 - l);\r\n\r\ncosh = cos(h);\r\nsinh = sin(h);\r\n\r\nr = l + a * (-0.14861 * cosh + 1.78277 * sinh);\r\n\r\ng = l + a * (-0.29227 * cosh - 0.90649 * sinh);\r\n\r\nb = l + a * (1.97294 * cosh);\r\n\r\nout1 = vec(1, r, g, b);", |
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"text" : "param gamma 1." |
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} |
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} |
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, { |
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"box" : { |
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"id" : "obj-1", |
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"text" : "in 1" |
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"text" : "out 1" |
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