echarts roamHelper 源码
echarts roamHelper 代码
文件路径：/src/component/helper/roamHelper.ts
/*
* 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.
*/
import Element from 'zrender/src/Element';
interface ControllerHost {
target: Element,
zoom?: number
zoomLimit?: {min?: number, max?: number}
}
/**
* For geo and graph.
*/
export function updateViewOnPan(controllerHost: ControllerHost, dx: number, dy: number) {
const target = controllerHost.target;
target.x += dx;
target.y += dy;
target.dirty();
}
/**
* For geo and graph.
*/
export function updateViewOnZoom(controllerHost: ControllerHost, zoomDelta: number, zoomX: number, zoomY: number) {
const target = controllerHost.target;
const zoomLimit = controllerHost.zoomLimit;
let newZoom = controllerHost.zoom = controllerHost.zoom || 1;
newZoom *= zoomDelta;
if (zoomLimit) {
const zoomMin = zoomLimit.min || 0;
const zoomMax = zoomLimit.max || Infinity;
newZoom = Math.max(
Math.min(zoomMax, newZoom),
zoomMin
);
}
const zoomScale = newZoom / controllerHost.zoom;
controllerHost.zoom = newZoom;
// Keep the mouse center when scaling
target.x -= (zoomX - target.x) * (zoomScale - 1);
target.y -= (zoomY - target.y) * (zoomScale - 1);
target.scaleX *= zoomScale;
target.scaleY *= zoomScale;
target.dirty();
}
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