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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.
*/

/**
 * Line path for bezier and straight line draw
 */

import * as graphic from '../../util/graphic';
import * as vec2 from 'zrender/src/core/vector';

var straightLineProto = graphic.Line.prototype;
var bezierCurveProto = graphic.BezierCurve.prototype;

function isLine(shape) {
    return isNaN(+shape.cpx1) || isNaN(+shape.cpy1);
}

export default graphic.extendShape({

    type: 'ec-line',

    style: {
        stroke: '#000',
        fill: null
    },

    shape: {
        x1: 0,
        y1: 0,
        x2: 0,
        y2: 0,
        percent: 1,
        cpx1: null,
        cpy1: null
    },

    buildPath: function (ctx, shape) {
        this[isLine(shape) ? '_buildPathLine' : '_buildPathCurve'](ctx, shape);
    },
    _buildPathLine: straightLineProto.buildPath,
    _buildPathCurve: bezierCurveProto.buildPath,

    pointAt: function (t) {
        return this[isLine(this.shape) ? '_pointAtLine' : '_pointAtCurve'](t);
    },
    _pointAtLine: straightLineProto.pointAt,
    _pointAtCurve: bezierCurveProto.pointAt,

    tangentAt: function (t) {
        var shape = this.shape;
        var p = isLine(shape)
            ? [shape.x2 - shape.x1, shape.y2 - shape.y1]
            : this._tangentAtCurve(t);
        return vec2.normalize(p, p);
    },
    _tangentAtCurve: bezierCurveProto.tangentAt

});