/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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import View from '../coord/View';
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import { Payload } from '../util/types';
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export interface RoamPaylod extends Payload {
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dx: number
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dy: number
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zoom: number
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originX: number
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originY: number
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}
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export function updateCenterAndZoom(
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view: View,
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payload: RoamPaylod,
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zoomLimit?: {
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min?: number,
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max?: number
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}
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) {
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const previousZoom = view.getZoom();
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const center = view.getCenter();
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let zoom = payload.zoom;
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const point = view.dataToPoint(center);
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if (payload.dx != null && payload.dy != null) {
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point[0] -= payload.dx;
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point[1] -= payload.dy;
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view.setCenter(view.pointToData(point));
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}
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if (zoom != null) {
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if (zoomLimit) {
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const zoomMin = zoomLimit.min || 0;
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const zoomMax = zoomLimit.max || Infinity;
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zoom = Math.max(
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Math.min(previousZoom * zoom, zoomMax),
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zoomMin
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) / previousZoom;
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}
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// Zoom on given point(originX, originY)
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view.scaleX *= zoom;
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view.scaleY *= zoom;
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const fixX = (payload.originX - view.x) * (zoom - 1);
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const fixY = (payload.originY - view.y) * (zoom - 1);
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view.x -= fixX;
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view.y -= fixY;
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view.updateTransform();
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// Get the new center
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view.setCenter(view.pointToData(point));
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view.setZoom(zoom * previousZoom);
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}
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return {
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center: view.getCenter(),
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zoom: view.getZoom()
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};
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}
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