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telesci.js
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telesci.js
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function visit(target, telepad, error) {
let rotation = target.bearing + error.bearing;
let angle = clamp(target.elevation + error.elevation, 1, 90);
let power = clamp(target.power + error.power, 1, 1000);
let distance = 0.1 * power**2 * Math.sin(angle * Math.PI / 90)
let targetX = Math.round(telepad.x + distance * Math.sin(rotation * Math.PI / 180));
let targetY = Math.round(telepad.y + distance * Math.cos(rotation * Math.PI / 180));
return {
x: targetX,
y: targetY
};
}
function triangulate(target, telepad, error, recurse) {
recurse = typeof recurse == 'undefined';
const POWERS = [5, 10, 20, 25, 30, 40, 50, 80, 100];
target.x -= telepad.x;
target.y -= telepad.y;
let distance = Math.hypot(target.x, target.y);
//calculate minimum power for minimal electricity losses
for(P of POWERS) {
let elevation = 90 / Math.PI * Math.asin(10 * distance / (P + error.power)**2);
let trueElevation = elevation - error.elevation;
let invElevation = 90 - elevation - error.elevation;
let bearing = 180 / Math.PI * Math.atan2(target.x, target.y) + error.bearing;
bearing = bearing < 0 ? bearing + 360 : bearing;
let trueGood = (trueElevation > 0 && trueElevation < 90);
let invGood = (invElevation > 0 && invElevation < 90);
if(!Number.isNaN(elevation) && (trueGood || invGood)) {
let hit = {
bearing: bearing,
elevation: trueGood ? trueElevation : invElevation,
power: P
};
let miss = visit(hit, telepad, error);
if(!recurse)
return hit;
target.x = (target.x + telepad.x) - (miss.x - target.x - telepad.x);
target.y = (target.y + telepad.y) - (miss.y - target.y - telepad.y);
return triangulate(target, telepad, error, false);
}
}
return {
bearing: NaN,
elevation: NaN,
power: NaN
};
}
function calculateErrors(telepadCoords, coords1, coords2, bearing, elevation1, elevation2, power1, power2, powerBased) {
let boff, eoff, poff;
let delta1 = {
x: coords1.x - telepadCoords.x,
y: coords1.y - telepadCoords.y,
};
let delta2 = {
x: coords2.x - telepadCoords.x,
y: coords2.y - telepadCoords.y,
};
let D1 = Math.hypot(delta1.x, delta1.y);
let D2 = Math.hypot(delta2.x, delta2.y);
let bearing1 = Math.atan2(delta1.x, delta1.y) * 180 / Math.PI;
let bearing2 = Math.atan2(delta2.x, delta2.y) * 180 / Math.PI;
boff = -Math.round((2 * bearing - bearing1 - bearing2) / 2); //average
if(powerBased) {
poff = clamp(Math.round((Math.sqrt(D2) * power1 - Math.sqrt(D1) * power2) / (Math.sqrt(D1) - Math.sqrt(D2))), -4, 0);
let elev1 = Math.asin(10 * D1 / (power1 + poff)**2) * 90 / Math.PI;
let elev2 = Math.asin(10 * D2 / (power2 + poff)**2) * 90 / Math.PI;
if(Number.isNaN(elevation1)) {
eoff = -Math.round(elevation1 - elev2);
} else if(Number.isNaN(elevation2)) {
eoff = -Math.round(elevation1 - elev1);
} else {
eoff = -Math.round((2 * elevation1 - elev1 - elev2) / 2);
}
} else {
eoff = Math.round(
90 / Math.PI * Math.atan(
(D2 * Math.sin(Math.PI / 90 * elevation1) - D1*Math.sin(Math.PI / 90 * elevation2)) / ///* fix vim highlighting here
(D1 * Math.cos(Math.PI / 90 * elevation2) - D2*Math.cos(Math.PI / 90 * elevation1))
)
);
let p1 = Math.sqrt(10 * D1 / Math.sin(Math.PI / 90 * (elevation1 + eoff)));
let p2 = Math.sqrt(10 * D2 / Math.sin(Math.PI / 90 * (elevation2 + eoff)));
poff = -Math.round((2 * power1 - p1 - p2) / 2);
}
return {
bearing: boff,
elevation: eoff,
power: poff
};
}
//fixme: make it do stuff
function adjustErrors(coords, telepad, oldErrors) {
let config = triangulate(coords, telepad, oldErrors);
let calculated = visit(config, telepad, oldErrors);
let Dold = Math.hypot(coords.x - telepad.x, coords.y - telepad.y);
let Dnew = Math.hypot(calculated.x - telepad.x, calculated.y - telepad.y);
let Bold = Math.atan2(coords.x - telepad.x, coords.y - telepad.y);
let Bnew = Math.atan2(calculated.x - telepad.x, calculated.y - telepad.y);
return {
bearing: oldErrors.bearing + Bnew - Bold,
elevation: oldErrors.elevation,
power: oldErrors.power
};
}
function clamp(value, min, max) {
return Math.max(min, Math.min(max, value));
}