Press n or j to go to the next uncovered block, b, p or k for the previous block.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 | 1x 1x 1x 9x 9x 1x 8x 5x 3x 2x 1x 2x 2x 1x 1x 3x 8x 8x 8x 2x 6x 2x 4x | const chroma = require('chroma-js') const { CodedError } = require('../helpers/errors') module.exports = { createColorRamp } function createColorRamp (params = {}) { const { breaks, colorRamps, type = 'algorithmic', fromColor = [0, 255, 0], toColor = [0, 0, 255], algorithm = 'HSVAlgorithm' } = params if (!breaks || breaks.length === 0) { throw new Error('Must supply breaks') } if (type === 'algorithmic') { return createAlgorithmicRamp({ fromColor, toColor, algorithm, breakCount: breaks.length }) } if (type === 'multipart') { return createMultipartRamp({ colorRamps, breakCount: breaks.length }) } throw new CodedError(`Invalid color ramp type: ${type}`, 400) } function createMultipartRamp (options) { const { colorRamps, breakCount } = options if (!colorRamps || !Array.isArray(colorRamps)) { throw new CodedError( 'Multipart color-ramps need a valid color-ramp configuration array' ) } return colorRamps.map((ramp) => { return createAlgorithmicRamp({ ...ramp, breakCount: breakCount }) }) } function createAlgorithmicRamp (options) { const { fromColor, toColor, algorithm, breakCount } = options const colorRamp = chroma.scale([fromColor.slice(0, 3), toColor.slice(0, 3)]) if (algorithm === 'esriCIELabAlgorithm') { return colorRamp.mode('lab').colors(breakCount, 'rgb') } if (algorithm === 'esriLabLChAlgorithm') { return colorRamp.mode('lch').colors(breakCount, 'rgb') } return colorRamp.mode('hsl').colors(breakCount, 'rgb') } |