wit-uniapp/node_modules/echarts/lib/action/roamHelper.js

/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements.  See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership.  The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License.  You may obtain a copy of the License at
*
*   http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied.  See the License for the
* specific language governing permissions and limitations
* under the License.
*/


/**
 * AUTO-GENERATED FILE. DO NOT MODIFY.
 */

/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements.  See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership.  The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License.  You may obtain a copy of the License at
*
*   http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied.  See the License for the
* specific language governing permissions and limitations
* under the License.
*/
function getCenterCoord(view, point) {
  // Use projected coord as center because it's linear.
  return view.pointToProjected ? view.pointToProjected(point) : view.pointToData(point);
}

export function updateCenterAndZoom(view, payload, zoomLimit, api) {
  var previousZoom = view.getZoom();
  var center = view.getCenter();
  var zoom = payload.zoom;
  var point = view.projectedToPoint ? view.projectedToPoint(center) : view.dataToPoint(center);

  if (payload.dx != null && payload.dy != null) {
    point[0] -= payload.dx;
    point[1] -= payload.dy;
    view.setCenter(getCenterCoord(view, point), api);
  }

  if (zoom != null) {
    if (zoomLimit) {
      var zoomMin = zoomLimit.min || 0;
      var zoomMax = zoomLimit.max || Infinity;
      zoom = Math.max(Math.min(previousZoom * zoom, zoomMax), zoomMin) / previousZoom;
    } // Zoom on given point(originX, originY)


    view.scaleX *= zoom;
    view.scaleY *= zoom;
    var fixX = (payload.originX - view.x) * (zoom - 1);
    var fixY = (payload.originY - view.y) * (zoom - 1);
    view.x -= fixX;
    view.y -= fixY;
    view.updateTransform(); // Get the new center

    view.setCenter(getCenterCoord(view, point), api);
    view.setZoom(zoom * previousZoom);
  }

  return {
    center: view.getCenter(),
    zoom: view.getZoom()
  };
}