ducha-qianduan/node_modules/zrender/lib/graphic/mixin/RectText.js

var textHelper = require("../helper/text");

var BoundingRect = require("../../core/BoundingRect");

var _constant = require("../constant");

var WILL_BE_RESTORED = _constant.WILL_BE_RESTORED;

/**
 * Mixin for drawing text in a element bounding rect
 * @module zrender/mixin/RectText
 */
var tmpRect = new BoundingRect();

var RectText = function () {};

RectText.prototype = {
  constructor: RectText,

  /**
   * Draw text in a rect with specified position.
   * @param  {CanvasRenderingContext2D} ctx
   * @param  {Object} rect Displayable rect
   */
  drawRectText: function (ctx, rect) {
    var style = this.style;
    rect = style.textRect || rect; // Optimize, avoid normalize every time.

    this.__dirty && textHelper.normalizeTextStyle(style, true);
    var text = style.text; // Convert to string

    text != null && (text += '');

    if (!textHelper.needDrawText(text, style)) {
      return;
    } // FIXME
    // Do not provide prevEl to `textHelper.renderText` for ctx prop cache,
    // but use `ctx.save()` and `ctx.restore()`. Because the cache for rect
    // text propably break the cache for its host elements.


    ctx.save(); // Transform rect to view space

    var transform = this.transform;

    if (!style.transformText) {
      if (transform) {
        tmpRect.copy(rect);
        tmpRect.applyTransform(transform);
        rect = tmpRect;
      }
    } else {
      this.setTransform(ctx);
    } // transformText and textRotation can not be used at the same time.


    textHelper.renderText(this, ctx, text, style, rect, WILL_BE_RESTORED);
    ctx.restore();
  }
};
var _default = RectText;
module.exports = _default;