逐步完成前后端服务器

frontend/node_modules/echarts/lib/action/roamHelper.js

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+
+/*
+* 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()
+  };
+}