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95 lines
3.0 KiB
JavaScript
95 lines
3.0 KiB
JavaScript
let DirectionUtil = {}
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/**
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* 返回旋转90°后的方向
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* @param {Internal.Direction} direction
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*/
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DirectionUtil.rotation90Direction = function(direction) {
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if (direction == Direction.NORTH) {
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return Direction.EAST
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}
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if (direction == Direction.SOUTH) {
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return Direction.WEST
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}
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if (direction == Direction.EAST) {
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return Direction.SOUTH
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}
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if (direction == Direction.WEST) {
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return Direction.NORTH
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}
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}
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/**
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* 返回旋转270°后的方向
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* @param {Internal.Direction} direction
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*/
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DirectionUtil.rotation270Direction = function(direction) {
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if (direction == Direction.NORTH) {
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return Direction.WEST
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}
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if (direction == Direction.SOUTH) {
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return Direction.EAST
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}
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if (direction == Direction.EAST) {
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return Direction.NORTH
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}
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if (direction == Direction.WEST) {
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return Direction.SOUTH
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}
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}
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/**
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* 根据两个坐标点计算方向，并返回对应方向的翻译文本（通过Text.translate函数获取）
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*
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* 值得注意的是，mc的世界坐标系是+y向上的右手坐标系，故+x轴为东方时，+z轴是南方。
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* @param { number } x1
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* @param { number } y1
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* @param { number } x2
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* @param { number } y2
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* @returns
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*/
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function getDirection(x1, y1, x2, y2) {
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const dx = x2 - x1;
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const dy = y2 - y1;
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// 如果两点坐标相同，返回提示文本
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if (dx === 0 && dy === 0) {
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return 'Same Point';
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}
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// 定义各个方向对应的翻译文本常量
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const DIRECTION_NORTH = Text.translate("message.createdelight.north");
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const DIRECTION_SOUTH = Text.translate("message.createdelight.south");
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const DIRECTION_EAST = Text.translate("message.createdelight.east");
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const DIRECTION_WEST = Text.translate("message.createdelight.west");
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const DIRECTION_NORTHEAST = Text.translate("message.createdelight.northeast");
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const DIRECTION_SOUTHEAST = Text.translate("message.createdelight.southeast");
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const DIRECTION_SOUTHWEST = Text.translate("message.createdelight.southwest");
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const DIRECTION_NORTHWEST = Text.translate("message.createdelight.northwest");
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// tan(pi/8)，用于判断方向是否更接近 正方位
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const thres = 2^(1/2) - 1
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// 当dy绝对值显著大于（> tan(pi/8)）dx绝对值时，为南/北方向
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if (Math.abs(dy) > thres * Math.abs(dx)) {
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return dy > 0? DIRECTION_SOUTH : DIRECTION_NORTH;
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}
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// 当dx绝对值显著大于（> tan(pi/8)）dy绝对值时，为东/西方向
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if (Math.abs(dx) > thres * Math.abs(dy)) {
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return dx > 0? DIRECTION_EAST : DIRECTION_WEST;
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}
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// 根据dx和dy的正负情况判断斜向方向
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// 注意+z指向南方而-z指向北方
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if (dx > 0 && dy > 0) {
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return DIRECTION_SOUTHEAST;
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}
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if (dx > 0 && dy < 0) {
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return DIRECTION_NORTHEAST;
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}
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if (dx < 0 && dy > 0) {
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return DIRECTION_SOUTHWEST;
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}
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if (dx < 0 && dy < 0) {
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return DIRECTION_NORTHWEST;
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}
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}
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