salva-la-costanera/src/utils.ts

import { Juego } from "./main";

export type Pos = {
    x: number, y: number,
};
export type Box = Pos & {
    width: number, height: number,
}

export function posInBox(box: Box, pos: Pos) {
    return pos.x > box.x && pos.x < box.x + box.width
        && pos.y > box.y && pos.y < box.y + box.height
}
export function boxCollision(box1: Box, box2: Box) {
    // http://stackoverflow.com/questions/2440377/ddg#7301852
    return !(
        ((box1.y + box1.height) < (box2.y)) ||
        (box1.y > (box2.y + box2.height)) ||
        ((box1.x + box1.width) < box2.x) ||
        (box1.x > (box2.x + box2.width))
    )
}

export function drawText(juego: Juego<any>, text: string, pos: Pos, {
    bold = false,
    size = 2,
    align = "left",
    baseline = "top",
}: {
    align?: CanvasTextAlign,
    baseline?: CanvasTextBaseline,
    bold?: boolean,
    // in rem
    size?: number,
}): Box {
    juego.ctx.font = `${bold ? 'bold ' : ''}${size}rem sans-serif`
    juego.ctx.textAlign = align
    juego.ctx.textBaseline = baseline
    juego.ctx.fillText(text, pos.x, pos.y)

    const measure = juego.ctx.measureText(text)
    return { ...pos, width: measure.width, height: measure.actualBoundingBoxDescent }
}

export function randomFromArray<T>(array: T[]): T {
    return array[Math.floor(Math.random() * array.length)]
}