belt.js

/*Copyright 2015-2019 Kirk McDonald

Licensed 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.*/
"use strict"

function Belt(name, speed) {
    this.name = name
    this.speed = speed
}

function getBelts(data) {
    var beltData = data["transport-belt"]
    var beltObjs = []
    for (var beltName in beltData) {
        var beltInfo = beltData[beltName]
        // Belt speed is given in tiles/tick, which we can convert to
        // items/second as follows:
        //       tiles      ticks              32 pixels/tile
        // speed ----- * 60 ------ * 2 lanes * --------------
        //       tick       second             9 pixels/item
        // 0.17 changes this formula from 9 pixels/item to 8 pixels/item.
        var baseSpeed = RationalFromFloat(beltInfo.speed)
        var pixelsPerSecond = baseSpeed.mul(RationalFromFloat(3840))
        var speed
        if (useLegacyCalculations) {
            speed = pixelsPerSecond.div(RationalFromFloat(9))
        } else {
            speed = pixelsPerSecond.div(RationalFromFloat(8))
        }
        beltObjs.push(new Belt(beltName, speed))
    }
    beltObjs.sort(function(a, b) {
        if (a.speed.less(b.speed)) {
            return -1
        } else if (b.speed.less(a.speed)) {
            return 1
        }
        return 0
    })
    return beltObjs
}