sonarqube/server/sonar-web/src/main/js/components/charts/BubbleChart.tsx

/*
 * SonarQube
 * Copyright (C) 2009-2021 SonarSource SA
 * mailto:info AT sonarsource DOT com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
import * as classNames from 'classnames';
import { max, min } from 'd3-array';
import { scaleLinear, ScaleLinear } from 'd3-scale';
import { event, select } from 'd3-selection';
import { zoom, ZoomBehavior, zoomIdentity } from 'd3-zoom';
import { sortBy, uniq } from 'lodash';
import * as React from 'react';
import { Link } from 'react-router';
import { AutoSizer } from 'react-virtualized/dist/commonjs/AutoSizer';
import { translate } from '../../helpers/l10n';
import { Location } from '../../helpers/urls';
import Tooltip from '../controls/Tooltip';
import './BubbleChart.css';

const TICKS_COUNT = 5;

interface BubbleItem<T> {
  color?: string;
  key?: string;
  link?: string | Location;
  data?: T;
  size: number;
  tooltip?: React.ReactNode;
  x: number;
  y: number;
}

interface Props<T> {
  displayXGrid?: boolean;
  displayXTicks?: boolean;
  displayYGrid?: boolean;
  displayYTicks?: boolean;
  formatXTick: (tick: number) => string;
  formatYTick: (tick: number) => string;
  height: number;
  items: BubbleItem<T>[];
  onBubbleClick?: (ref?: T) => void;
  padding: [number, number, number, number];
  sizeDomain?: [number, number];
  sizeRange?: [number, number];
  xDomain?: [number, number];
  yDomain?: [number, number];
}

interface State {
  transform: { x: number; y: number; k: number };
}

type Scale = ScaleLinear<number, number>;

export default class BubbleChart<T> extends React.PureComponent<Props<T>, State> {
  private node?: Element;
  private zoom?: ZoomBehavior<Element, unknown>;

  static defaultProps = {
    displayXGrid: true,
    displayXTicks: true,
    displayYGrid: true,
    displayYTicks: true,
    formatXTick: (d: number) => String(d),
    formatYTick: (d: number) => String(d),
    padding: [10, 10, 10, 10],
    sizeRange: [5, 45]
  };

  constructor(props: Props<T>) {
    super(props);
    this.state = { transform: { x: 0, y: 0, k: 1 } };
  }

  componentDidUpdate() {
    if (this.zoom && this.node) {
      const rect = this.node.getBoundingClientRect();
      this.zoom.translateExtent([
        [0, 0],
        [rect.width, rect.height]
      ]);
    }
  }

  boundNode = (node: SVGSVGElement) => {
    this.node = node;
    this.zoom = zoom()
      .scaleExtent([1, 10])
      .on('zoom', this.zoomed);
    select(this.node).call(this.zoom as any);
  };

  zoomed = () => {
    const { padding } = this.props;
    const { x, y, k } = event.transform as { x: number; y: number; k: number };
    this.setState({
      transform: {
        x: x + padding[3] * (k - 1),
        y: y + padding[0] * (k - 1),
        k
      }
    });
  };

  resetZoom = (e: React.MouseEvent<Link>) => {
    e.stopPropagation();
    e.preventDefault();
    if (this.zoom && this.node) {
      select(this.node).call(this.zoom.transform as any, zoomIdentity);
    }
  };

  getXRange(xScale: Scale, sizeScale: Scale, availableWidth: number) {
    const minX = min(this.props.items, d => xScale(d.x) - sizeScale(d.size)) || 0;
    const maxX = max(this.props.items, d => xScale(d.x) + sizeScale(d.size)) || 0;
    const dMinX = minX < 0 ? xScale.range()[0] - minX : xScale.range()[0];
    const dMaxX = maxX > xScale.range()[1] ? maxX - xScale.range()[1] : 0;
    return [dMinX, availableWidth - dMaxX];
  }

  getYRange(yScale: Scale, sizeScale: Scale, availableHeight: number) {
    const minY = min(this.props.items, d => yScale(d.y) - sizeScale(d.size)) || 0;
    const maxY = max(this.props.items, d => yScale(d.y) + sizeScale(d.size)) || 0;
    const dMinY = minY < 0 ? yScale.range()[1] - minY : yScale.range()[1];
    const dMaxY = maxY > yScale.range()[0] ? maxY - yScale.range()[0] : 0;
    return [availableHeight - dMaxY, dMinY];
  }

  getTicks(scale: Scale, format: (d: number) => string) {
    const zoomAmount = Math.ceil(this.state.transform.k);
    const ticks = scale.ticks(TICKS_COUNT * zoomAmount).map(tick => format(tick));
    const uniqueTicksCount = uniq(ticks).length;
    const ticksCount =
      uniqueTicksCount < TICKS_COUNT * zoomAmount ? uniqueTicksCount - 1 : TICKS_COUNT * zoomAmount;
    return scale.ticks(ticksCount);
  }

  getZoomLevelLabel = () => Math.floor(this.state.transform.k * 100) + '%';

  renderXGrid = (ticks: number[], xScale: Scale, yScale: Scale) => {
    if (!this.props.displayXGrid) {
      return null;
    }

    const { transform } = this.state;
    const lines = ticks.map((tick, index) => {
      const x = xScale(tick);
      const y1 = yScale.range()[0];
      const y2 = yScale.range()[1];
      return (
        <line
          className="bubble-chart-grid"
          // eslint-disable-next-line react/no-array-index-key
          key={index}
          x1={x * transform.k + transform.x}
          x2={x * transform.k + transform.x}
          y1={y1 * transform.k}
          y2={transform.k > 1 ? 0 : y2}
        />
      );
    });

    return <g>{lines}</g>;
  };

  renderYGrid = (ticks: number[], xScale: Scale, yScale: Scale) => {
    if (!this.props.displayYGrid) {
      return null;
    }

    const { transform } = this.state;
    const lines = ticks.map((tick, index) => {
      const y = yScale(tick);
      const x1 = xScale.range()[0];
      const x2 = xScale.range()[1];
      return (
        <line
          className="bubble-chart-grid"
          // eslint-disable-next-line react/no-array-index-key
          key={index}
          x1={transform.k > 1 ? 0 : x1}
          x2={x2 * transform.k}
          y1={y * transform.k + transform.y}
          y2={y * transform.k + transform.y}
        />
      );
    });

    return <g>{lines}</g>;
  };

  renderXTicks = (xTicks: number[], xScale: Scale, yScale: Scale) => {
    if (!this.props.displayXTicks) {
      return null;
    }

    const { transform } = this.state;
    const ticks = xTicks.map((tick, index) => {
      const x = xScale(tick) * transform.k + transform.x;
      const y = yScale.range()[0];
      const innerText = this.props.formatXTick(tick);
      // as we modified the `x` using `transform`, check that it is inside the range again
      return x > 0 && x < xScale.range()[1] ? (
        // eslint-disable-next-line react/no-array-index-key
        <text className="bubble-chart-tick" dy="1.5em" key={index} x={x} y={y}>
          {innerText}
        </text>
      ) : null;
    });

    return <g>{ticks}</g>;
  };

  renderYTicks = (yTicks: number[], xScale: Scale, yScale: Scale) => {
    if (!this.props.displayYTicks) {
      return null;
    }

    const { transform } = this.state;
    const ticks = yTicks.map((tick, index) => {
      const x = xScale.range()[0];
      const y = yScale(tick) * transform.k + transform.y;
      const innerText = this.props.formatYTick(tick);
      // as we modified the `y` using `transform`, check that it is inside the range again
      return y > 0 && y < yScale.range()[0] ? (
        <text
          className="bubble-chart-tick bubble-chart-tick-y"
          dx="-0.5em"
          dy="0.3em"
          // eslint-disable-next-line react/no-array-index-key
          key={index}
          x={x}
          y={y}>
          {innerText}
        </text>
      ) : null;
    });

    return <g>{ticks}</g>;
  };

  renderChart = (width: number) => {
    const { transform } = this.state;
    const availableWidth = width - this.props.padding[1] - this.props.padding[3];
    const availableHeight = this.props.height - this.props.padding[0] - this.props.padding[2];

    const xScale = scaleLinear()
      .domain(this.props.xDomain || [0, max(this.props.items, d => d.x) || 0])
      .range([0, availableWidth])
      .nice();
    const yScale = scaleLinear()
      .domain(this.props.yDomain || [0, max(this.props.items, d => d.y) || 0])
      .range([availableHeight, 0])
      .nice();
    const sizeScale = scaleLinear()
      .domain(this.props.sizeDomain || [0, max(this.props.items, d => d.size) || 0])
      .range(this.props.sizeRange || []);

    const xScaleOriginal = xScale.copy();
    const yScaleOriginal = yScale.copy();

    xScale.range(this.getXRange(xScale, sizeScale, availableWidth));
    yScale.range(this.getYRange(yScale, sizeScale, availableHeight));

    const bubbles = sortBy(this.props.items, b => -b.size).map((item, index) => {
      return (
        <Bubble
          color={item.color}
          data={item.data}
          key={item.key || index}
          link={item.link}
          onClick={this.props.onBubbleClick}
          r={sizeScale(item.size)}
          scale={1 / transform.k}
          tooltip={item.tooltip}
          x={xScale(item.x)}
          y={yScale(item.y)}
        />
      );
    });

    const xTicks = this.getTicks(xScale, this.props.formatXTick);
    const yTicks = this.getTicks(yScale, this.props.formatYTick);

    return (
      <svg
        className={classNames('bubble-chart')}
        height={this.props.height}
        ref={this.boundNode}
        width={width}>
        <defs>
          <clipPath id="graph-region">
            <rect
              // Extend clip by 2 pixels: one for clipRect border, and one for Bubble borders
              height={availableHeight + 4}
              width={availableWidth + 4}
              x={-2}
              y={-2}
            />
          </clipPath>
        </defs>
        <g transform={`translate(${this.props.padding[3]}, ${this.props.padding[0]})`}>
          <g clipPath="url(#graph-region)">
            {this.renderXGrid(xTicks, xScale, yScale)}
            {this.renderYGrid(yTicks, xScale, yScale)}
            <g transform={`translate(${transform.x}, ${transform.y}) scale(${transform.k})`}>
              {bubbles}
            </g>
          </g>
          {this.renderXTicks(xTicks, xScale, yScaleOriginal)}
          {this.renderYTicks(yTicks, xScaleOriginal, yScale)}
        </g>
      </svg>
    );
  };

  render() {
    return (
      <div>
        <div className="bubble-chart-zoom">
          <Tooltip overlay={translate('component_measures.bubble_chart.zoom_level')}>
            <Link onClick={this.resetZoom} to="#">
              {this.getZoomLevelLabel()}
            </Link>
          </Tooltip>
        </div>
        <AutoSizer disableHeight={true}>{size => this.renderChart(size.width)}</AutoSizer>
      </div>
    );
  }
}

interface BubbleProps<T> {
  color?: string;
  link?: string | Location;
  onClick?: (ref?: T) => void;
  data?: T;
  r: number;
  scale: number;
  tooltip?: string | React.ReactNode;
  x: number;
  y: number;
}

function Bubble<T>(props: BubbleProps<T>) {
  const handleClick = (e: React.MouseEvent<SVGCircleElement>) => {
    if (props.onClick) {
      e.stopPropagation();
      e.preventDefault();
      props.onClick(props.data);
    }
  };

  let circle = (
    <circle
      className="bubble-chart-bubble"
      onClick={props.onClick ? handleClick : undefined}
      r={props.r}
      style={{ fill: props.color, stroke: props.color }}
      transform={`translate(${props.x}, ${props.y}) scale(${props.scale})`}
    />
  );

  if (props.link && !props.onClick) {
    circle = <Link to={props.link}>{circle}</Link>;
  }

  return (
    <Tooltip overlay={props.tooltip || undefined}>
      <g>{circle}</g>
    </Tooltip>
  );
}