47 lines
1.5 KiB
JavaScript
47 lines
1.5 KiB
JavaScript
"use strict";
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import chroma from 'chroma-js';
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import marker_svg from '../marker-embed.svg';
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import gradients from './Gradients.mjs';
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class MarkerGenerator {
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constructor() {
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}
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marker_default() {
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return marker_svg.replace("{{colour_a}}", "#1975c8")
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.replace("{{colour_b}}", "#5ea6d5")
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.replace("{{colour_dark}}", "#2e6d99");
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}
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marker(value, type) {
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let col = this.get_colour(value, type);
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let result = marker_svg.replace(/\{\{colour_a\}\}/g, col.darken(0.25).hex())
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.replace(/\{\{colour_b\}\}/g, col.brighten(0.25).hex())
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.replace(/\{\{colour_dark\}\}/g, col.darken(1))
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.replace(/\{\{id_grad\}\}/g, `marker-grad-${btoa(`${type}-${value}`).replace(/\+/g, "-").replace(/\//g, "_")}`);
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return result;
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}
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/**
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* Fetches the colour for a given value of a given type.
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* Currently a gradient is not used - i.e. a value is coloured according to
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* the last threshold it crossed in the associated gradient definition.
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* TODO: Calculate the gradient instead.
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* @param {number} value The value to calculate the colour for.
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* @param {string} type The type of measurement value we're working with. Determines the gradient to use.
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* @return {chroma} The calculated colour.
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*/
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get_colour(value, type) {
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if(typeof gradients[type] == "undefined") {
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console.warn(`[MarkerGenerator] Warning: Unknown gradient type '${type}', using unknown instead.`);
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type = "unknown";
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}
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return gradients[type].chroma(value);
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}
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}
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export default MarkerGenerator;
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