Tyler Hallada
4d1ef84568
Unfortunately, all of the train data has to be copied from the train web worker to the main thread on every tick so it knows the new positions of the trains to render. So every few ticks, the GC causes a little lag as it collects ~90+MB of obsolete train arrays. There's no way for the two threads to share the same data thanks to Spectre.
53 lines
1.6 KiB
TypeScript
53 lines
1.6 KiB
TypeScript
import Point from 'pixi.js/lib/core/math/Point';
|
|
|
|
const EPSILON = 1.0;
|
|
|
|
export const randomInt = (min: number, max: number): number => (
|
|
// inclusive of min and max
|
|
Math.floor(Math.random() * (max - (min + 1))) + min
|
|
);
|
|
|
|
export const weightedRandom = (choices: any[], weights: number[]): any => {
|
|
const totalWeight = weights.reduce((a, b) => a + b, 0);
|
|
const rand = randomInt(0, totalWeight);
|
|
let cumulWeight = 0;
|
|
for (let i = 0; i < weights.length; i += 1) {
|
|
cumulWeight += weights[i];
|
|
if (rand < cumulWeight) {
|
|
return choices[i];
|
|
}
|
|
}
|
|
};
|
|
|
|
export const randomPoint = (height: number, width: number): Point => (
|
|
new Point(randomInt(0, width), randomInt(0, height))
|
|
);
|
|
|
|
export const pointsEqual = (pointA: Point, pointB: Point): boolean => (
|
|
(pointA.x === pointB.x && pointA.y === pointB.y)
|
|
);
|
|
|
|
export const pointsAlmostEqual = (pointA: Point, pointB: Point): boolean => (
|
|
Math.abs(pointA.x - pointB.x) < EPSILON &&
|
|
Math.abs(pointA.y - pointB.y) < EPSILON
|
|
);
|
|
|
|
export const distance = (pointA: Point, pointB: Point): number => {
|
|
const distX = pointA.x - pointB.x;
|
|
const distY = pointA.y - pointB.y;
|
|
return Math.sqrt((distX * distX) + (distY * distY));
|
|
};
|
|
|
|
export const rangeMap = (num: number, inMin: number, inMax: number,
|
|
outMin: number, outMax: number): number => (
|
|
(num - inMin) * (outMax - outMin) / (inMax - inMin) + outMin
|
|
);
|
|
|
|
export const angleRadians = (pointA: Point, pointB: Point): number => (
|
|
Math.atan2(-(pointB.x - pointA.x), pointB.y - pointA.y)
|
|
);
|
|
|
|
export const angleDegrees = (pointA: Point, pointB: Point): number => (
|
|
180 + angleRadians(pointA, pointB) * (180 / Math.PI)
|
|
);
|