@swimlane/ngx-charts
Version:
Declarative Charting Framework for Angular
145 lines • 17.8 kB
JavaScript
import { range } from 'd3-array';
import { scaleBand, scaleLinear, scaleOrdinal, scaleQuantile } from 'd3-scale';
import { colorSets } from '../utils/color-sets';
import { ScaleType } from './types/scale-type.enum';
export class ColorHelper {
constructor(scheme, type, domain, customColors) {
if (typeof scheme === 'string') {
scheme = colorSets.find(cs => {
return cs.name === scheme;
});
}
this.colorDomain = scheme.domain;
this.scaleType = type;
this.domain = domain;
this.customColors = customColors;
this.scale = this.generateColorScheme(scheme, type, this.domain);
}
generateColorScheme(scheme, type, domain) {
if (typeof scheme === 'string') {
scheme = colorSets.find(cs => {
return cs.name === scheme;
});
}
let colorScale;
switch (type) {
case ScaleType.Quantile:
colorScale = scaleQuantile()
.range(scheme.domain)
.domain(domain);
break;
case ScaleType.Ordinal:
colorScale = scaleOrdinal()
.range(scheme.domain)
.domain(domain);
break;
case ScaleType.Linear:
{
const colorDomain = [...scheme.domain];
if (colorDomain.length === 1) {
colorDomain.push(colorDomain[0]);
this.colorDomain = colorDomain;
}
const points = range(0, 1, 1.0 / colorDomain.length);
colorScale = scaleLinear()
.range(colorDomain)
.domain(points);
}
break;
default:
break;
}
return colorScale;
}
getColor(value) {
if (value === undefined || value === null) {
throw new Error('Value can not be null');
}
if (this.scaleType === ScaleType.Linear) {
const valueScale = scaleLinear()
.domain(this.domain)
.range([0, 1]);
return this.scale(valueScale(value));
}
else {
if (typeof this.customColors === 'function') {
return this.customColors(value);
}
const formattedValue = value.toString();
let found; // todo type customColors
if (this.customColors && this.customColors.length > 0) {
found = this.customColors.find(mapping => {
return mapping.name.toLowerCase() === formattedValue.toLowerCase();
});
}
if (found) {
return found.value;
}
else {
return this.scale(value);
}
}
}
getLinearGradientStops(value, start) {
if (start === undefined) {
start = this.domain[0];
}
const valueScale = scaleLinear()
.domain(this.domain)
.range([0, 1]);
const colorValueScale = scaleBand().domain(this.colorDomain).range([0, 1]);
const endColor = this.getColor(value);
// generate the stops
const startVal = valueScale(start);
const startColor = this.getColor(start);
const endVal = valueScale(value);
let i = 1;
let currentVal = startVal;
const stops = [];
stops.push({
color: startColor,
offset: startVal,
originalOffset: startVal,
opacity: 1
});
while (currentVal < endVal && i < this.colorDomain.length) {
const color = this.colorDomain[i];
const offset = colorValueScale(color);
if (offset <= startVal) {
i++;
continue;
}
if (offset.toFixed(4) >= (endVal - colorValueScale.bandwidth()).toFixed(4)) {
break;
}
stops.push({
color,
offset,
opacity: 1
});
currentVal = offset;
i++;
}
if (stops[stops.length - 1].offset < 100) {
stops.push({
color: endColor,
offset: endVal,
opacity: 1
});
}
if (endVal === startVal) {
stops[0].offset = 0;
stops[1].offset = 100;
}
else {
// normalize the offsets into percentages
if (stops[stops.length - 1].offset !== 100) {
for (const s of stops) {
s.offset = ((s.offset - startVal) / (endVal - startVal)) * 100;
}
}
}
return stops;
}
}
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{ range } from 'd3-array';\nimport {\n  scaleBand,\n  ScaleLinear,\n  scaleLinear,\n  ScaleOrdinal,\n  scaleOrdinal,\n  ScaleQuantile,\n  scaleQuantile\n} from 'd3-scale';\n\nimport { Color, colorSets } from '../utils/color-sets';\nimport { StringOrNumberOrDate } from '../models/chart-data.model';\nimport { ScaleType } from './types/scale-type.enum';\nimport { Gradient } from './types/gradient.interface';\n\nexport class ColorHelper {\n  scale: any;\n  scaleType: ScaleType;\n  colorDomain: string[];\n  domain: number[] | string[];\n  customColors: any;\n\n  constructor(scheme: string | Color, type: ScaleType, domain: number[] | string[], customColors?) {\n    if (typeof scheme === 'string') {\n      scheme = colorSets.find(cs => {\n        return cs.name === scheme;\n      });\n    }\n    this.colorDomain = scheme.domain;\n    this.scaleType = type;\n    this.domain = domain;\n    this.customColors = customColors;\n\n    this.scale = this.generateColorScheme(scheme, type, this.domain);\n  }\n\n  generateColorScheme(scheme: string | Color, type: ScaleType, domain: number[] | string[]): any {\n    if (typeof scheme === 'string') {\n      scheme = colorSets.find(cs => {\n        return cs.name === scheme;\n      });\n    }\n\n    let colorScale: ScaleQuantile<number> | ScaleOrdinal<string, unknown> | ScaleLinear<number, number>;\n    switch (type) {\n      case ScaleType.Quantile:\n        colorScale = scaleQuantile()\n          .range(scheme.domain as any)\n          .domain(domain as number[]);\n        break;\n      case ScaleType.Ordinal:\n        colorScale = scaleOrdinal()\n          .range(scheme.domain)\n          .domain(domain as string[]);\n        break;\n      case ScaleType.Linear:\n        {\n          const colorDomain = [...scheme.domain];\n          if (colorDomain.length === 1) {\n            colorDomain.push(colorDomain[0]);\n            this.colorDomain = colorDomain;\n          }\n\n          const points = range(0, 1, 1.0 / colorDomain.length);\n          colorScale = scaleLinear()\n            .range(colorDomain as any)\n            .domain(points);\n        }\n        break;\n      default:\n        break;\n    }\n\n    return colorScale;\n  }\n\n  getColor(value: StringOrNumberOrDate): string {\n    if (value === undefined || value === null) {\n      throw new Error('Value can not be null');\n    }\n    if (this.scaleType === ScaleType.Linear) {\n      const valueScale = scaleLinear()\n        .domain(this.domain as number[])\n        .range([0, 1]);\n\n      return this.scale(valueScale(value as number));\n    } else {\n      if (typeof this.customColors === 'function') {\n        return this.customColors(value);\n      }\n\n      const formattedValue = value.toString();\n      let found: any; // todo type customColors\n      if (this.customColors && this.customColors.length > 0) {\n        found = this.customColors.find(mapping => {\n          return mapping.name.toLowerCase() === formattedValue.toLowerCase();\n        });\n      }\n\n      if (found) {\n        return found.value;\n      } else {\n        return this.scale(value);\n      }\n    }\n  }\n\n  getLinearGradientStops(value: number | string, start?: number | string): Gradient[] {\n    if (start === undefined) {\n      start = this.domain[0];\n    }\n    const valueScale = scaleLinear()\n      .domain(this.domain as number[])\n      .range([0, 1]);\n\n    const colorValueScale = scaleBand().domain(this.colorDomain).range([0, 1]);\n\n    const endColor = this.getColor(value);\n\n    // generate the stops\n    const startVal = valueScale(start as number);\n    const startColor = this.getColor(start);\n\n    const endVal = valueScale(value as number);\n    let i = 1;\n    let currentVal = startVal;\n    const stops: Gradient[] = [];\n\n    stops.push({\n      color: startColor,\n      offset: startVal,\n      originalOffset: startVal,\n      opacity: 1\n    });\n\n    while (currentVal < endVal && i < this.colorDomain.length) {\n      const color = this.colorDomain[i];\n      const offset = colorValueScale(color);\n      if (offset <= startVal) {\n        i++;\n        continue;\n      }\n\n      if (offset.toFixed(4) >= (endVal - colorValueScale.bandwidth()).toFixed(4)) {\n        break;\n      }\n\n      stops.push({\n        color,\n        offset,\n        opacity: 1\n      });\n      currentVal = offset;\n      i++;\n    }\n\n    if (stops[stops.length - 1].offset < 100) {\n      stops.push({\n        color: endColor,\n        offset: endVal,\n        opacity: 1\n      });\n    }\n\n    if (endVal === startVal) {\n      stops[0].offset = 0;\n      stops[1].offset = 100;\n    } else {\n      // normalize the offsets into percentages\n      if (stops[stops.length - 1].offset !== 100) {\n        for (const s of stops) {\n          s.offset = ((s.offset - startVal) / (endVal - startVal)) * 100;\n        }\n      }\n    }\n\n    return stops;\n  }\n}\n"]}