node-red-contrib-tak-registration
Version:
A Node-RED node to register to TAK and to help wrap files as datapackages to send to TAK
197 lines (168 loc) • 3.48 kB
JavaScript
export default class RobustDeterminant {
static orientationIndex(p1, p2, q) {
const dx1 = p2.x - p1.x
const dy1 = p2.y - p1.y
const dx2 = q.x - p2.x
const dy2 = q.y - p2.y
return RobustDeterminant.signOfDet2x2(dx1, dy1, dx2, dy2)
}
static signOfDet2x2(x1, y1, x2, y2) {
let sign = null
let swap = null
let k = null
let count = 0
sign = 1
if (x1 === 0.0 || y2 === 0.0)
if (y1 === 0.0 || x2 === 0.0)
return 0
else if (y1 > 0)
if (x2 > 0)
return -sign
else
return sign
else
if (x2 > 0)
return sign
else
return -sign
if (y1 === 0.0 || x2 === 0.0)
if (y2 > 0)
if (x1 > 0)
return sign
else
return -sign
else
if (x1 > 0)
return -sign
else
return sign
if (0.0 < y1) {
if (0.0 < y2) {
if (y1 <= y2) {
} else {
sign = -sign
swap = x1
x1 = x2
x2 = swap
swap = y1
y1 = y2
y2 = swap
}
} else
if (y1 <= -y2) {
sign = -sign
x2 = -x2
y2 = -y2
} else {
swap = x1
x1 = -x2
x2 = swap
swap = y1
y1 = -y2
y2 = swap
}
} else
if (0.0 < y2) {
if (-y1 <= y2) {
sign = -sign
x1 = -x1
y1 = -y1
} else {
swap = -x1
x1 = x2
x2 = swap
swap = -y1
y1 = y2
y2 = swap
}
} else
if (y1 >= y2) {
x1 = -x1
y1 = -y1
x2 = -x2
y2 = -y2
} else {
sign = -sign
swap = -x1
x1 = -x2
x2 = swap
swap = -y1
y1 = -y2
y2 = swap
}
if (0.0 < x1) {
if (0.0 < x2)
if (x1 <= x2)
;
else
return sign
else
return sign
} else
if (0.0 < x2) {
return -sign
} else
if (x1 >= x2) {
sign = -sign
x1 = -x1
x2 = -x2
} else {
return -sign
}
while (true) {
count = count + 1
k = Math.floor(x2 / x1)
x2 = x2 - k * x1
y2 = y2 - k * y1
if (y2 < 0.0)
return -sign
if (y2 > y1)
return sign
if (x1 > x2 + x2) {
if (y1 < y2 + y2)
return sign
} else {
if (y1 > y2 + y2) {
return -sign
} else {
x2 = x1 - x2
y2 = y1 - y2
sign = -sign
}
}
if (y2 === 0.0)
if (x2 === 0.0)
return 0
else
return -sign
if (x2 === 0.0)
return sign
k = Math.floor(x1 / x2)
x1 = x1 - k * x2
y1 = y1 - k * y2
if (y1 < 0.0)
return sign
if (y1 > y2)
return -sign
if (x2 > x1 + x1) {
if (y2 < y1 + y1)
return -sign
} else {
if (y2 > y1 + y1) {
return sign
} else {
x1 = x2 - x1
y1 = y2 - y1
sign = -sign
}
}
if (y1 === 0.0)
if (x1 === 0.0)
return 0
else
return sign
if (x1 === 0.0)
return -sign
}
}
}