ducha-qianduan/node_modules/echarts/lib/chart/graph/createView.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.
*/

var View = require("../../coord/View");

var _layout = require("../../util/layout");

var getLayoutRect = _layout.getLayoutRect;

var bbox = require("zrender/lib/core/bbox");

/*
* 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.
*/
// FIXME Where to create the simple view coordinate system
function getViewRect(seriesModel, api, aspect) {
  var option = seriesModel.getBoxLayoutParams();
  option.aspect = aspect;
  return getLayoutRect(option, {
    width: api.getWidth(),
    height: api.getHeight()
  });
}

function _default(ecModel, api) {
  var viewList = [];
  ecModel.eachSeriesByType('graph', function (seriesModel) {
    var coordSysType = seriesModel.get('coordinateSystem');

    if (!coordSysType || coordSysType === 'view') {
      var data = seriesModel.getData();
      var positions = data.mapArray(function (idx) {
        var itemModel = data.getItemModel(idx);
        return [+itemModel.get('x'), +itemModel.get('y')];
      });
      var min = [];
      var max = [];
      bbox.fromPoints(positions, min, max); // If width or height is 0

      if (max[0] - min[0] === 0) {
        max[0] += 1;
        min[0] -= 1;
      }

      if (max[1] - min[1] === 0) {
        max[1] += 1;
        min[1] -= 1;
      }

      var aspect = (max[0] - min[0]) / (max[1] - min[1]); // FIXME If get view rect after data processed?

      var viewRect = getViewRect(seriesModel, api, aspect); // Position may be NaN, use view rect instead

      if (isNaN(aspect)) {
        min = [viewRect.x, viewRect.y];
        max = [viewRect.x + viewRect.width, viewRect.y + viewRect.height];
      }

      var bbWidth = max[0] - min[0];
      var bbHeight = max[1] - min[1];
      var viewWidth = viewRect.width;
      var viewHeight = viewRect.height;
      var viewCoordSys = seriesModel.coordinateSystem = new View();
      viewCoordSys.zoomLimit = seriesModel.get('scaleLimit');
      viewCoordSys.setBoundingRect(min[0], min[1], bbWidth, bbHeight);
      viewCoordSys.setViewRect(viewRect.x, viewRect.y, viewWidth, viewHeight); // Update roam info

      viewCoordSys.setCenter(seriesModel.get('center'));
      viewCoordSys.setZoom(seriesModel.get('zoom'));
      viewList.push(viewCoordSys);
    }
  });
  return viewList;
}

module.exports = _default;