echarts roamHelper 源码
echarts roamHelper 代码
文件路径：/src/action/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 type Geo from '../coord/geo/Geo';
import type View from '../coord/View';
import type ExtensionAPI from '../core/ExtensionAPI';
import type { Payload } from '../util/types';
export interface RoamPayload extends Payload {
dx: number
dy: number
zoom: number
originX: number
originY: number
}
function getCenterCoord(view: View, point: number[]) {
// Use projected coord as center because it's linear.
return (view as Geo).pointToProjected
? (view as Geo).pointToProjected(point)
: view.pointToData(point);
}
export function updateCenterAndZoom(
view: View,
payload: RoamPayload,
zoomLimit?: {
min?: number,
max?: number
},
api?: ExtensionAPI
) {
const previousZoom = view.getZoom();
const center = view.getCenter();
let zoom = payload.zoom;
const point = (view as Geo).projectedToPoint
? (view as Geo).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) {
const zoomMin = zoomLimit.min || 0;
const 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;
const fixX = (payload.originX - view.x) * (zoom - 1);
const 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()
};
}
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