tsparticles/browser/Plugins/Emitters/Shapes/Square/SquareShape.js

Easily create highly customizable particle, confetti and fireworks animations and use them as animated backgrounds for your website. Ready to use components available also for React, Vue.js (2.x and 3.x), Angular, Svelte, jQuery, Preact, Riot.js, Inferno.

function randomSquareCoordinate(position, offset) {
    return position + offset * (Math.random() - 0.5);
}
export class SquareShape {
    randomPosition(position, size, fill) {
        if (fill) {
            return {
                x: randomSquareCoordinate(position.x, size.width),
                y: randomSquareCoordinate(position.y, size.height),
            };
        }
        else {
            const halfW = size.width / 2, halfH = size.height / 2, side = Math.floor(Math.random() * 4), v = (Math.random() - 0.5) * 2;
            switch (side) {
                case 0:
                    // top-left
                    return {
                        x: position.x + v * halfW,
                        y: position.y - halfH,
                    };
                case 1:
                    // top-right
                    return {
                        x: position.x - halfW,
                        y: position.y + v * halfH,
                    };
                case 2:
                    // bottom-right
                    return {
                        x: position.x + v * halfW,
                        y: position.y + halfH,
                    };
                case 3:
                default:
                    // bottom-left
                    return {
                        x: position.x + halfW,
                        y: position.y + v * halfH,
                    };
            }
        }
    }
}