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.
*/
/**
* For geo and graph.
*
* @param {Object} controllerHost
* @param {module:zrender/Element} controllerHost.target
*/
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}
*/
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();
}
exports.updateViewOnPan = updateViewOnPan;
exports.updateViewOnZoom = updateViewOnZoom;