feat:提交

tests/dev1/dataHandle/common/base/MathComm.ts

@@ -0,0 +1,128 @@
+/** 相等, 相差小于diff */
+export function equal(a: number, b: number, diff = 0.001): boolean
+{
+  return Math.abs(a - b) < diff
+}
+
+/** ab相差dis */
+export function isDiffer(a: number, b: number, dis: number, diff = 0.001): boolean
+{
+  let rdis = Math.abs(a - b)
+  return rdis > dis - diff && rdis < dis + diff
+}
+
+/** 两点间距离 */
+export function getDis2(p1, p2): number
+{
+  let x1 = p1.pointX || p1.X || p1.x || 0
+  let y1 = p1.pointY || p1.Y || p1.y || 0
+  let x2 = p2.pointX || p2.X || p2.x || 0
+  let y2 = p2.pointY || p2.Y || p2.y || 0
+  return getDis(x1, y1, x2, y2)
+}
+
+/** 两点间距离 */
+export function getDis(x1: number, y1: number, x2: number, y2: number): number
+{
+  let xt = x1 - x2
+  let yt = y1 - y2
+  return Math.sqrt(xt * xt + yt * yt)
+}
+
+/** 两点间弧度半径 */
+export function getR(x1: number, y1: number, x2: number, y2: number, bul: number): number
+{
+  if (bul == 0)
+    return 0
+  let d = Math.sqrt((x1 - x2) ** 2 + (y1 - y2) ** 2) / 2
+  return 0.5 * d * (1 + bul ** 2) / bul
+}
+
+/** 获取两点间的半径 */
+export function getR2(p1, p2): number
+{
+  let bul = p1.Curve || p1.bul || 0
+  if (bul == 0)
+    return 0
+
+  let x1 = p1.pointX || p1.X || p1.x
+  let y1 = p1.pointY || p1.Y || p1.y
+  let x2 = p2.pointX || p2.X || p2.x
+  let y2 = p2.pointY || p2.Y || p2.y
+
+  return getR(x1, y1, x2, y2, bul)
+}
+
+/** 截取小数点 */
+export function round(n: number, bit = 3): number
+{
+  if (bit < 1)
+    return n
+  let tt = 10 ** bit
+  return Math.round(n * tt) / tt
+}
+
+/**
+ * 获得四点p{x,y}形成的矩形{x,y,w,l};
+ *  不是矩形 返回null
+ */
+export function getRect(p0, p1, p2, p3): any
+{
+  if (equal(p0.x, p1.x) == false && equal(p0.y, p1.y) == false)
+    return null
+
+  // 中心点
+  let xc = (p0.x + p1.x + p2.x + p3.x) / 4
+  let yc = (p0.y + p1.y + p2.y + p3.y) / 4
+
+  let dis0 = getDis(p0.x, p0.y, xc, yc)
+  let dis1 = getDis(p1.x, p1.y, xc, yc)
+  let dis2 = getDis(p2.x, p2.y, xc, yc)
+  let dis3 = getDis(p3.x, p3.y, xc, yc)
+
+  if (equal(dis0, dis1) && equal(dis0, dis2) && equal(dis0, dis3))
+  {
+    let x = Math.min(p0.x, p1.x, p2.x, p3.x)
+    let y = Math.min(p0.y, p1.y, p2.y, p3.y)
+
+    let w = Math.max(p0.x, p1.x, p2.x, p3.x) - x
+    let l = Math.max(p0.y, p1.y, p2.y, p3.y) - y
+    if (w < 0.01 || l < 0.01)
+      return null
+    return { x, y, w, l }
+  }
+  return null
+}
+
+/** 获取两点的直线的一般式方程AX+BY+C=0  ABC */
+export function getLineABC(x1: number, y1: number, x2: number, y2: number)
+{
+  let A = y2 - y1
+  let B = x1 - x2
+  let C = x2 * y1 - x1 * y2
+  return { A, B, C }
+}
+
+/** 获取点 p(x,y) 到两点的线的距离 */
+export function getDis_PointLine(x1: number, y1: number, x2: number, y2: number, x: number, y: number)
+{
+  let abc = getLineABC(x1, y1, x2, y2)
+  let aabb = Math.sqrt(abc.A * abc.A + abc.B * abc.B)
+  if (aabb == 0)
+    return 0
+
+  return Math.abs(abc.A * x + abc.B * y + abc.C) / aabb
+}
+
+/** 删除重复点 */
+export function removeRepeatPoint(pts, fuzz = 0.01)
+{
+  for (let n = pts.length - 1; n >= 0; n--) {
+    let p = n - 1
+    if (p < 0)
+      p = pts.length - 1
+
+    if (getDis2(pts[p], pts[n]) < fuzz)
+      pts.splice(n, 1)
+  }
+}