| /* |
| * 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. |
| */ |
| |
| /** |
| * @param {module:echarts/coord/View} view |
| * @param {Object} payload |
| * @param {Object} [zoomLimit] |
| */ |
| export function updateCenterAndZoom(view, payload, zoomLimit) { |
| var previousZoom = view.getZoom(); |
| var center = view.getCenter(); |
| var zoom = payload.zoom; |
| var point = view.dataToPoint(center); |
| |
| if (payload.dx != null && payload.dy != null) { |
| point[0] -= payload.dx; |
| point[1] -= payload.dy; |
| var center = view.pointToData(point); |
| view.setCenter(center); |
| } |
| |
| 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.scale[0] *= zoom; |
| view.scale[1] *= zoom; |
| var position = view.position; |
| var fixX = (payload.originX - position[0]) * (zoom - 1); |
| var fixY = (payload.originY - position[1]) * (zoom - 1); |
| position[0] -= fixX; |
| position[1] -= fixY; |
| view.updateTransform(); // Get the new center |
| |
| var center = view.pointToData(point); |
| view.setCenter(center); |
| view.setZoom(zoom * previousZoom); |
| } |
| |
| return { |
| center: view.getCenter(), |
| zoom: view.getZoom() |
| }; |
| } |