wit-uniapp/node_modules/echarts/lib/component/helper/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.
*/

/**
 * For geo and graph.
 */
export function updateViewOnPan(controllerHost, dx, dy) {
  var target = controllerHost.target;
  target.x += dx;
  target.y += dy;
  target.dirty();
}
/**
 * For geo and graph.
 */

export function updateViewOnZoom(controllerHost, zoomDelta, zoomX, zoomY) {
  var target = controllerHost.target;
  var zoomLimit = controllerHost.zoomLimit;
  var newZoom = controllerHost.zoom = controllerHost.zoom || 1;
  newZoom *= zoomDelta;

  if (zoomLimit) {
    var zoomMin = zoomLimit.min || 0;
    var zoomMax = zoomLimit.max || Infinity;
    newZoom = Math.max(Math.min(zoomMax, newZoom), zoomMin);
  }

  var zoomScale = newZoom / controllerHost.zoom;
  controllerHost.zoom = newZoom; // Keep the mouse center when scaling

  target.x -= (zoomX - target.x) * (zoomScale - 1);
  target.y -= (zoomY - target.y) * (zoomScale - 1);
  target.scaleX *= zoomScale;
  target.scaleY *= zoomScale;
  target.dirty();
}