| /* |
| * 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. |
| * |
| * @param {Object} controllerHost |
| * @param {module:zrender/Element} controllerHost.target |
| */ |
| export function updateViewOnPan(controllerHost, dx, dy) { |
| var target = controllerHost.target; |
| var pos = target.position; |
| pos[0] += dx; |
| pos[1] += dy; |
| target.dirty(); |
| } |
| /** |
| * For geo and graph. |
| * |
| * @param {Object} controllerHost |
| * @param {module:zrender/Element} controllerHost.target |
| * @param {number} controllerHost.zoom |
| * @param {number} controllerHost.zoomLimit like: {min: 1, max: 2} |
| */ |
| |
| export function updateViewOnZoom(controllerHost, zoomDelta, zoomX, zoomY) { |
| var target = controllerHost.target; |
| var zoomLimit = controllerHost.zoomLimit; |
| var pos = target.position; |
| var scale = target.scale; |
| 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 |
| |
| pos[0] -= (zoomX - pos[0]) * (zoomScale - 1); |
| pos[1] -= (zoomY - pos[1]) * (zoomScale - 1); |
| scale[0] *= zoomScale; |
| scale[1] *= zoomScale; |
| target.dirty(); |
| } |