visjs-network/lib/network/modules/components/nodes/shapes/Circle.js

A dynamic, browser-based network visualization library.

'use strict'

import CircleImageBase from '../util/CircleImageBase'

/**
 * A Circle Node/Cluster shape.
 *
 * @extends CircleImageBase
 */
class Circle extends CircleImageBase {
  /**
   * @param {Object} options
   * @param {Object} body
   * @param {Label} labelModule
   */
  constructor(options, body, labelModule) {
    super(options, body, labelModule)
    this._setMargins(labelModule)
  }

  /**
   *
   * @param {CanvasRenderingContext2D} ctx
   * @param {boolean} [selected]
   * @param {boolean} [hover]
   */
  resize(ctx, selected = this.selected, hover = this.hover) {
    if (this.needsRefresh(selected, hover)) {
      var dimensions = this.getDimensionsFromLabel(ctx, selected, hover)

      var diameter = Math.max(
        dimensions.width + this.margin.right + this.margin.left,
        dimensions.height + this.margin.top + this.margin.bottom
      )

      this.options.size = diameter / 2 // NOTE: this size field only set here, not in Ellipse, Database, Box
      this.width = diameter
      this.height = diameter
      this.radius = this.width / 2
    }
  }

  /**
   *
   * @param {CanvasRenderingContext2D} ctx
   * @param {number} x width
   * @param {number} y height
   * @param {boolean} selected
   * @param {boolean} hover
   * @param {ArrowOptions} values
   */
  draw(ctx, x, y, selected, hover, values) {
    this.resize(ctx, selected, hover)
    this.left = x - this.width / 2
    this.top = y - this.height / 2

    this._drawRawCircle(ctx, x, y, values)

    this.updateBoundingBox(x, y)
    this.labelModule.draw(
      ctx,
      this.left + this.textSize.width / 2 + this.margin.left,
      y,
      selected,
      hover
    )
  }

  /**
   *
   * @param {number} x width
   * @param {number} y height
   */
  updateBoundingBox(x, y) {
    this.boundingBox.top = y - this.options.size
    this.boundingBox.left = x - this.options.size
    this.boundingBox.right = x + this.options.size
    this.boundingBox.bottom = y + this.options.size
  }

  // prettier-ignore
  /**
   *
   * @param {CanvasRenderingContext2D} ctx
   * @param {number} angle - Unused
   * @returns {number}
   */
  distanceToBorder(ctx, angle) { // eslint-disable-line no-unused-vars
    this.resize(ctx)
    return this.width * 0.5
  }
}

export default Circle