BoundingRect.js

var vec2 = require("./vector");

var matrix = require("./matrix");

/**
 * @module echarts/core/BoundingRect
 */
var v2ApplyTransform = vec2.applyTransform;
var mathMin = Math.min;
var mathMax = Math.max;
/**
 * @alias module:echarts/core/BoundingRect
 */

function BoundingRect(x, y, width, height) {
  if (width < 0) {
    x = x + width;
    width = -width;
  }

  if (height < 0) {
    y = y + height;
    height = -height;
  }
  /**
   * @type {number}
   */


  this.x = x;
  /**
   * @type {number}
   */

  this.y = y;
  /**
   * @type {number}
   */

  this.width = width;
  /**
   * @type {number}
   */

  this.height = height;
}

BoundingRect.prototype = {
  constructor: BoundingRect,

  /**
   * @param {module:echarts/core/BoundingRect} other
   */
  union: function (other) {
    var x = mathMin(other.x, this.x);
    var y = mathMin(other.y, this.y);
    this.width = mathMax(other.x + other.width, this.x + this.width) - x;
    this.height = mathMax(other.y + other.height, this.y + this.height) - y;
    this.x = x;
    this.y = y;
  },

  /**
   * @param {Array.<number>} m
   * @methods
   */
  applyTransform: function () {
    var lt = [];
    var rb = [];
    var lb = [];
    var rt = [];
    return function (m) {
      // In case usage like this
      // el.getBoundingRect().applyTransform(el.transform)
      // And element has no transform
      if (!m) {
        return;
      }

      lt[0] = lb[0] = this.x;
      lt[1] = rt[1] = this.y;
      rb[0] = rt[0] = this.x + this.width;
      rb[1] = lb[1] = this.y + this.height;
      v2ApplyTransform(lt, lt, m);
      v2ApplyTransform(rb, rb, m);
      v2ApplyTransform(lb, lb, m);
      v2ApplyTransform(rt, rt, m);
      this.x = mathMin(lt[0], rb[0], lb[0], rt[0]);
      this.y = mathMin(lt[1], rb[1], lb[1], rt[1]);
      var maxX = mathMax(lt[0], rb[0], lb[0], rt[0]);
      var maxY = mathMax(lt[1], rb[1], lb[1], rt[1]);
      this.width = maxX - this.x;
      this.height = maxY - this.y;
    };
  }(),

  /**
   * Calculate matrix of transforming from self to target rect
   * @param  {module:zrender/core/BoundingRect} b
   * @return {Array.<number>}
   */
  calculateTransform: function (b) {
    var a = this;
    var sx = b.width / a.width;
    var sy = b.height / a.height;
    var m = matrix.create(); // 矩阵右乘

    matrix.translate(m, m, [-a.x, -a.y]);
    matrix.scale(m, m, [sx, sy]);
    matrix.translate(m, m, [b.x, b.y]);
    return m;
  },

  /**
   * @param {(module:echarts/core/BoundingRect|Object)} b
   * @return {boolean}
   */
  intersect: function (b) {
    if (!b) {
      return false;
    }

    if (!(b instanceof BoundingRect)) {
      // Normalize negative width/height.
      b = BoundingRect.create(b);
    }

    var a = this;
    var ax0 = a.x;
    var ax1 = a.x + a.width;
    var ay0 = a.y;
    var ay1 = a.y + a.height;
    var bx0 = b.x;
    var bx1 = b.x + b.width;
    var by0 = b.y;
    var by1 = b.y + b.height;
    return !(ax1 < bx0 || bx1 < ax0 || ay1 < by0 || by1 < ay0);
  },
  contain: function (x, y) {
    var rect = this;
    return x >= rect.x && x <= rect.x + rect.width && y >= rect.y && y <= rect.y + rect.height;
  },

  /**
   * @return {module:echarts/core/BoundingRect}
   */
  clone: function () {
    return new BoundingRect(this.x, this.y, this.width, this.height);
  },

  /**
   * Copy from another rect
   */
  copy: function (other) {
    this.x = other.x;
    this.y = other.y;
    this.width = other.width;
    this.height = other.height;
  },
  plain: function () {
    return {
      x: this.x,
      y: this.y,
      width: this.width,
      height: this.height
    };
  }
};
/**
 * @param {Object|module:zrender/core/BoundingRect} rect
 * @param {number} rect.x
 * @param {number} rect.y
 * @param {number} rect.width
 * @param {number} rect.height
 * @return {module:zrender/core/BoundingRect}
 */

BoundingRect.create = function (rect) {
  return new BoundingRect(rect.x, rect.y, rect.width, rect.height);
};

var _default = BoundingRect;
module.exports = _default;