/*
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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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/**
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* Line path for bezier and straight line draw
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*/
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import * as graphic from '../../util/graphic';
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import * as vec2 from 'zrender/src/core/vector';
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import { PathProps } from 'zrender/src/graphic/Path';
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import { ColorString } from '../../util/types';
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const straightLineProto = graphic.Line.prototype;
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const bezierCurveProto = graphic.BezierCurve.prototype;
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class StraightLineShape {
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// Start point
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x1 = 0;
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y1 = 0;
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// End point
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x2 = 0;
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y2 = 0;
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percent = 1;
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}
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class CurveShape extends StraightLineShape {
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cpx1: number;
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cpy1: number;
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}
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interface ECLineProps extends PathProps {
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shape?: Partial<StraightLineShape | CurveShape>
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}
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function isStraightLine(shape: StraightLineShape | CurveShape): shape is StraightLineShape {
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return isNaN(+(shape as CurveShape).cpx1) || isNaN(+(shape as CurveShape).cpy1);
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}
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class ECLinePath extends graphic.Path<ECLineProps> {
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type = 'ec-line';
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shape: StraightLineShape | CurveShape;
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constructor(opts?: ECLineProps) {
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super(opts);
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}
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getDefaultStyle() {
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return {
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stroke: '#000',
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fill: null as ColorString
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};
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}
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getDefaultShape() {
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return new StraightLineShape();
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}
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buildPath(ctx: CanvasRenderingContext2D, shape: StraightLineShape | CurveShape) {
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if (isStraightLine(shape)) {
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straightLineProto.buildPath.call(this, ctx, shape);
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}
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else {
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bezierCurveProto.buildPath.call(this, ctx, shape);
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}
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}
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pointAt(t: number) {
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if (isStraightLine(this.shape)) {
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return straightLineProto.pointAt.call(this, t);
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}
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else {
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return bezierCurveProto.pointAt.call(this, t);
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}
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}
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tangentAt(t: number) {
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const shape = this.shape;
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const p = isStraightLine(shape)
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? [shape.x2 - shape.x1, shape.y2 - shape.y1]
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: bezierCurveProto.tangentAt.call(this, t);
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return vec2.normalize(p, p);
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}
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}
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export default ECLinePath;
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