Ballistics Drag Functions NPM Library

Usage

1import ballistics from 'pg-ballistics';
2// Returns an array of 'Range' objects each of which represents a row on the ballistics table
3const rangeData = ballistics.getRangeData(weather, target, firearm, round);

Models

1export interface Firearm {
2    id: string;
3    name: string;
4    // Gradients are clicks required to match 1 full turret unit.
5    // MoA and IPHY are 1, 2 or 4 displayed in select as 1, 1/2, 1/4 per click
6    // Mil scopes are always 10 clicks per Mil shown as 1/10
7    elevationTurretGradients: number;
8    reticleUnits: string; // 'Mil', 'MoA', or 'IPHY'
9    rounds: Array<Round>;
10    sightHeightInches: number;
11    turretUnits: string; // 'Mil', 'MoA', or 'IPHY'
12    windageTurretGradients: number;
13    zeroRangeUnits: string; // 'Yards' or 'Meters'
14    zeroRange: number;
15}
16export interface Range {
17    rangeMeters: number;
18    rangeYards: number;
19    velocityFPS: number;
20    energyFtLbs: number;
21    timeSeconds: number;
22    dropInches: number;
23    verticalPositionInches: number;
24    // Cross Winds take on full range value regardless of Slant To Target
25    crossWindDriftInches: number;
26    leadInches: number;
27    slantDegrees: number;
28    // All the remaining properties are computed
29    verticalPositionMil: number;
30    verticalPositionMoA: number;
31    verticalPositionIPHY: number;
32    crossWindDriftMil: number;
33    crossWindDriftMoA: number;
34    crossWindDriftIPHY: number;
35    leadMil: number;
36    leadMoA: number;
37    leadIPHY: number;
38    slantDropInches: number;
39    slantMil: number;
40    slantMoA: number;
41    slantIPHY: number;
42}
43export interface Round {
44    id: string;
45    name: string;
46    bulletBC: number;
47    bulletDiameterInches: number;
48    bulletWeightGrains: number;
49    muzzleVelocityFPS: number;
50}
51export interface Target {
52    distanceUnits: string; // 'Yards' or 'Meters'
53    distance: number;
54    chartStepping: number;
55    sizeInches?: number;
56    slantDegrees: number;
57    speedMPH: number;
58}
59export interface Weather {
60    altitudeFeet: number;
61    temperatureDegreesFahrenheit: number;
62    barometricPressureInchesHg: number;
63    relativeHumidityPercent: number;
64    windVelocityMPH: number;
65    windAngleDegrees: number;
66}

Functions

getRangeData(weather, target, firearm, round) - Returns an array of 'Range' objects each of which represents a row on the ballistics table