[GitHub] [incubator-echarts] Ovilia opened a new pull request #11684: WIP(axisPointer): snapping logic WIP.

[GitBox <gi...@apache.org>]

Ovilia opened a new pull request #11684: WIP(axisPointer): snapping logic WIP.
URL: https://github.com/apache/incubator-echarts/pull/11684
 
 
   ```
   /**
   * If both x and y axes are snapping and one and only one of them is
   * of category type, then the category axis is used as primary
   * snapping, otherwise the baseAxis is used as primary snapping.
   * The snapped value of the other axis is calculated from it.
   *
   *  4 |                 *
   *  3 |       *
   *  2 |            *
   *  1 |  *     +
   *    ---------------------
   *       a    b    c    d
   *
   * In the above example, the x axis is in category type, and y axis
   *     value.
   * The *'s are data items, + is the mouse position.
   *
   * If both x and y axes are using snapping, then:
   * 1. x axis is used as primary snapping axis because it's the only
   *     category axis.
   * 2. The nearest x value to the mouse is 'b', so 'b' is used as
   *     snapped x value.
   * 3. The corresponding y value of 'b' is 3, so 3 is used as snapped y
   *     value.
   * 4. So the axisPointer should be at ('b', 3).
   *
   * If only x is snapping, then the axisPointer should be at ('b', 1).
   * If only y is snapping, then the axisPointer should be at the
   *     position of +.
   */
   ```
   

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