计算给定角度和长度的向量 [英] Calculate vector with given angle and length

问题描述

有什么方法可以在javascript中调用一个带有x和y坐标以及方向(以度为单位的角度)的函数，它会返回一组已移动"的新坐标' 沿原始坐标给出的方向增加 10 像素?我环顾四周，但我只能找到获得两个给定坐标的角度的方法.

Is there any way in which, in javascript, I can call a function with an x and y co-ord and a direction(angle in degrees) and it will return a set of new co-ords that has been 'moved' by 10px in the direction given from the original co-ords? I looked around but all I can find is ways to get the angle of two given co-ords.

抱歉，如果措辞不好.

推荐答案

此函数返回新坐标的数组[xCoord, yCoord]:

This function returns an array [xCoord, yCoord] of the new coordinates:

function myFunction(xCoord, yCoord, angle, length) {
    length = typeof length !== 'undefined' ? length : 10;
    angle = angle * Math.PI / 180; // if you're using degrees instead of radians
    return [length * Math.cos(angle) + xCoord, length * Math.sin(angle) + yCoord]
}

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