92 lines
2.0 KiB
JavaScript
92 lines
2.0 KiB
JavaScript
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/**
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* {数学相关}
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* @author yutent<yutent.io@gmail.com>
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* @date 2024/03/06 13:05:25
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*/
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/* -------------------------------------------------------- */
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/* --------------------- 数学方法 ---------------------- */
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/* -------------------------------------------------------- */
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/**
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* Returns an angle between two or three points
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- x1 (number) x coord of first point
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- y1 (number) y coord of first point
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- x2 (number) x coord of second point
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- y2 (number) y coord of second point
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- x3 (number) #optional x coord of third point
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- y3 (number) #optional y coord of third point
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= (number) angle in degrees
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*/
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export function angle(x1, y1, x2, y2, x3, y3) {
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if (x3 == null) {
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let x = x1 - x2,
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y = y1 - y2
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if (!x && !y) {
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return 0
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}
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return (180 + (Math.atan2(-y, -x) * 180) / Math.PI + 360) % 360
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} else {
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return angle(x1, y1, x3, y3) - angle(x2, y2, x3, y3)
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}
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}
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export function rad(deg) {
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return ((deg % 360) * Math.PI) / 180
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}
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export function deg(radius) {
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return ((radius * 180) / Math.PI) % 360
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}
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export function sin(angle) {
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return Math.sin(rad(angle))
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}
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export function tan(angle) {
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return Math.tan(rad(angle))
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}
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export function cos(angle) {
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return Math.cos(rad(angle))
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}
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export function asin(num) {
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return deg(Math.asin(num))
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}
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export function acos(num) {
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return deg(Math.acos(num))
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}
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export function atan(num) {
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return deg(Math.atan(num))
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}
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export function atan2(x, y) {
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return deg(Math.atan2(x, y))
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}
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/*\
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**
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* Returns distance between two points
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- x1 (number) x coord of first point
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- y1 (number) y coord of first point
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- x2 (number) x coord of second point
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- y2 (number) y coord of second point
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\*/
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export function len(x1, y1, x2, y2) {
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return Math.sqrt(len2(x1, y1, x2, y2))
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}
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/*\
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**
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* Returns squared distance between two points
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- x1 (number) x coord of first point
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- y1 (number) y coord of first point
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- x2 (number) x coord of second point
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- y2 (number) y coord of second point
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\*/
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export function len2(x1, y1, x2, y2) {
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return (x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2)
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}
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