microting/ngx-charts

import { Component, Input, Output, EventEmitter, ViewEncapsulation, ChangeDetectionStrategy } from '@angular/core';
import { scaleLinear, scaleTime, scaleBand } from 'd3-scale';
import { brushX } from 'd3-brush';
import { select, event as d3event } from 'd3-selection';

import { calculateViewDimensions, ViewDimensions, BaseChartComponent, ColorHelper } from '../../src';
import { id } from '../../src/utils';
import { ScaleType } from '../../src/utils/scale-type.enum';

@Component({
  selector: 'ngx-charts-timeline-filter-bar-chart',
  template: `
    <ngx-charts-chart
      [view]="[width, height]"
      [showLegend]="false"
      [animations]="animations"
      class="timeline-filter-bar-chart"
    >
      <svg:g [attr.transform]="transform" class="chart">
        <svg:g
          ngx-charts-x-axis
          *ngIf="xAxis"
          [xScale]="timeScale"
          [dims]="dims"
          [showLabel]="showXAxisLabel"
          [labelText]="xAxisLabel"
          [tickFormatting]="xAxisTickFormatting"
          (dimensionsChanged)="updateXAxisHeight($event)"
        ></svg:g>
        <svg:g
          ngx-charts-y-axis
          *ngIf="yAxis"
          [yScale]="yScale"
          [dims]="dims"
          [showGridLines]="showGridLines"
          [showLabel]="showYAxisLabel"
          [labelText]="yAxisLabel"
          [tickFormatting]="yAxisTickFormatting"
          (dimensionsChanged)="updateYAxisWidth($event)"
        ></svg:g>
        <svg:g
          ngx-charts-series-vertical
          [xScale]="xScale"
          [yScale]="yScale"
          [colors]="colors"
          [series]="results"
          [dims]="dims"
          [gradient]="gradient"
          [animations]="animations"
          [noBarWhenZero]="noBarWhenZero"
          tooltipDisabled="true"
        ></svg:g>
      </svg:g>

      <svg:g [attr.transform]="transform" class="timeline">
        <svg:filter [attr.id]="filterId">
          <svg:feColorMatrix
            in="SourceGraphic"
            type="matrix"
            values="0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0 0 0 1 0"
          />
        </svg:filter>
        <svg:rect x="0" [attr.width]="dims.width" y="0" [attr.height]="dims.height" class="brush-background" />
        <svg:g class="brush"></svg:g>
      </svg:g>
    </ngx-charts-chart>
  `,
  styleUrls: ['../../src/common/base-chart.component.scss'],
  encapsulation: ViewEncapsulation.None,
  changeDetection: ChangeDetectionStrategy.OnPush
})
export class TimelineFilterBarChartComponent extends BaseChartComponent {
  @Input() autoScale = false;
  @Input() schemeType = ScaleType.ordinal;
  @Input() valueDomain: number[];
  @Input() xAxis;
  @Input() yAxis;
  @Input() showXAxisLabel;
  @Input() showYAxisLabel;
  @Input() xAxisLabel;
  @Input() yAxisLabel;
  @Input() gradient;
  @Input() showGridLines: boolean = true;
  @Input() animations: boolean = true;
  @Input() noBarWhenZero: boolean = true;

  @Output() onFilter = new EventEmitter();

  dims: ViewDimensions;
  xSet: any;
  xDomain: any;
  yDomain: any;
  seriesDomain: any;
  yScale: any;
  xScale: any;
  xAxisHeight: number = 0;
  yAxisWidth: number = 0;
  timeScale: any;
  colors: ColorHelper;
  scaleType: string;
  transform: string;
  margin: any[] = [10, 20, 10, 0];
  initialized: boolean = false;
  filterId: any;
  filter: any;
  brush: any;

  update(): void {
    super.update();
    this.dims = calculateViewDimensions({
      width: this.width,
      height: this.height,
      margins: this.margin,
      showXAxis: this.xAxis,
      showYAxis: this.yAxis,
      xAxisHeight: this.xAxisHeight,
      yAxisWidth: this.yAxisWidth,
      showXLabel: this.showXAxisLabel,
      showYLabel: this.showYAxisLabel,
      showLegend: false,
      legendType: this.schemeType
    });

    this.xDomain = this.getXDomain();

    this.yDomain = this.getYDomain();
    this.timeScale = this.getTimeScale(this.xDomain, this.dims.width);
    this.xScale = this.getXScale(this.xSet, this.dims.width);
    this.yScale = this.getYScale(this.yDomain, this.dims.height);

    this.setColors();
    this.transform = `translate(${this.dims.xOffset} , ${this.margin[0]})`;

    if (this.brush) {
      this.updateBrush();
    }

    this.filterId = 'filter' + id().toString();
    this.filter = `url(#${this.filterId})`;

    if (!this.initialized) {
      this.addBrush();
      this.initialized = true;
    }
  }

  getXDomain(): any[] {
    const values = [];

    for (const d of this.results) {
      if (!values.includes(d.name)) {
        values.push(d.name);
      }
    }

    this.scaleType = this.getScaleType(values);
    let domain = [];

    const min = new Date(Math.min(...values));
    min.setHours(0);
    min.setMinutes(0);
    min.setSeconds(0);

    const max = new Date(Math.max(...values));
    max.setHours(23);
    max.setMinutes(59);
    max.setSeconds(59);

    domain = [min.getTime(), max.getTime()];

    this.xSet = values;
    return domain;
  }

  getYDomain(): any[] {
    if (this.valueDomain) {
      return this.valueDomain;
    }

    const domain = [];

    for (const d of this.results) {
      if (domain.indexOf(d.value) < 0) {
        domain.push(d.value);
      }
      if (d.min !== undefined) {
        if (domain.indexOf(d.min) < 0) {
          domain.push(d.min);
        }
      }
      if (d.max !== undefined) {
        if (domain.indexOf(d.max) < 0) {
          domain.push(d.max);
        }
      }
    }

    let min = Math.min(...domain);
    const max = Math.max(...domain);
    if (!this.autoScale) {
      min = Math.min(0, min);
    }

    return [min, max];
  }

  getXScale(domain, width): any {
    return scaleBand()
      .range([0, width])
      .paddingInner(0.1)
      .domain(domain);
  }

  getTimeScale(domain, width): any {
    return scaleTime()
      .range([0, width])
      .domain(domain);
  }

  getYScale(domain, height): any {
    const scale = scaleLinear()
      .range([height, 0])
      .domain(domain);

    return scale;
  }

  getScaleType(values): string {
    return 'time';
  }

  trackBy(index, item): string {
    return item.name;
  }

  setColors(): void {
    let domain;
    if (this.schemeType === 'ordinal') {
      domain = this.xSet;
    } else {
      domain = this.yDomain;
    }

    this.colors = new ColorHelper(this.scheme, this.schemeType, domain, this.customColors);
  }

  updateYAxisWidth({ width }): void {
    this.yAxisWidth = width;
    this.update();
  }

  updateXAxisHeight({ height }): void {
    this.xAxisHeight = height;
    this.update();
  }

  addBrush(): void {
    if (this.brush) return;

    const height = this.height;
    const width = this.width;

    this.brush = brushX()
      .extent([[0, 0], [width, height]])
      .on('brush end', () => {
        const selection = d3event.selection || this.xScale.range();
        const newDomain = selection.map(this.timeScale.invert);

        this.onFilter.emit(newDomain);
        this.cd.markForCheck();
      });

    select(this.chartElement.nativeElement)
      .select('.brush')
      .call(this.brush);
  }

  updateBrush(): void {
    if (!this.brush) return;

    const height = this.dims.height;
    const width = this.dims.width;

    this.brush.extent([[0, 0], [width, height]]);
    select(this.chartElement.nativeElement)
      .select('.brush')
      .call(this.brush);

    // clear hardcoded properties so they can be defined by CSS
    select(this.chartElement.nativeElement)
      .select('.selection')
      .attr('fill', undefined)
      .attr('stroke', undefined)
      .attr('fill-opacity', undefined);

    this.cd.markForCheck();
  }
}