pocket-physics/cjs/solve-gravitation.js

Verlet physics extracted from pocket-ces demos

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.solveGravitation = void 0;
const v2_1 = require("./v2");
const accel1 = (0, v2_1.v2)();
function solveGravitation(p1, p1mass, p2, p2mass, gravityConstant = 0.99) {
    // handle either obj not having mass
    if (p1mass <= 0 || p2mass <= 0)
        return;
    let mag;
    let factor;
    const diffx = p2.cpos.x - p1.cpos.x;
    const diffy = p2.cpos.y - p1.cpos.y;
    (0, v2_1.set)(accel1, diffx, diffy);
    mag = (0, v2_1.magnitude)(accel1);
    // Prevent divide by zero.
    mag = mag === 0 ? 1 : mag;
    // Newton's Law of Universal Gravitation -- Vector Form!
    factor = gravityConstant * ((p1mass * p2mass) / (mag * mag));
    // scale by gravity acceleration
    (0, v2_1.normalize)(accel1, accel1);
    (0, v2_1.scale)(accel1, accel1, factor);
    // add the acceleration from gravity to p1 accel
    (0, v2_1.add)(p1.acel, p1.acel, accel1);
}
exports.solveGravitation = solveGravitation;