/**
已知某一点坐标，旋转角度，长度，求另一点坐标
*/
export const calculateCoordinatePoint = (originPoint, degree, len) => {
let rotate = (degree - 90 + 360) % 360; //这里是因为一开始以 y 轴下方为 0 度的
let point = {
x: len,
y: 0
};
//计算某一点旋转后的坐标点，这里假设传入的点为原点
let relativeOriginPoint = calculateRotate(point, rotate);
//计算相对坐标系的坐标
let points = calculateCoordinateRelativePoint(originPoint, relativeOriginPoint);
return points;
};
/**
* 计算某一点旋转后的坐标点
* @
param point
* @
param degree
*/
export const calculateRotate = (point, degree) => {
let x = point.x * Math.cos(degree * Math.PI / 180) + point.y * Math.sin(degree * Math.PI / 180);
let y = -point.x * Math.sin(degree * Math.PI / 180) + point.y * Math.cos(degree * Math.PI / 180);
let relativeOriginPoint = {
x: Math.round(x * 100) / 100,
y: Math.round(y * 100) / 100
};
return relativeOriginPoint;
};
/**
* 计算相对坐标系的坐标
*/
export const calculateCoordinateRelativePoint = (origin, relativeOriginPoint) => {
let x = relativeOriginPoint.x + origin.x;
let y = relativeOriginPoint.y + origin.y;
let points = {
x: Math.round(x * 100) / 100,
y: Math.round(y * 100) / 100
};
return points;
};