gistfile1.txt

 function calculateDensityInCell() {
        for (let i = 0; i < N * (1 / squareSize); i++) {
            let tempArr = [];
            for (let j = 0; j < N * (1 / squareSize); j++) {

                let particlesInCell = particlesArr.filter(particle => {
                    if (((particle.x > (-N / 2) + j * squareSize) && (particle.x < (-N / 2) + squareSize + j * squareSize)) &&
                        ((particle.y < (N / 2) - i * squareSize) && (particle.y > (N / 2) - squareSize - i * squareSize))) {
                        return true;
                    }
                });
                tempArr = [...tempArr, particlesInCell.length / Math.pow(squareSize, 2)];
            }
            cellsDensity = [...cellsDensity, tempArr];
        }
        console.log(cellsDensity)
    }