debug.js

function cell_to_screen(cell) {
    return {
        x: (cell % 30 * 4 + 500 - offset_x) * 8,
        y: ((0|cell / 30) * 4 + 20 - offset_y) * 8,
    };
}

function DEBUG_distance_scores() {
    if (!DEBUG)
        return true;

    for (let [cell, score] of world.entries()) {
        if (isNaN(score) || score === 0 || score > 15)
            continue;

        let {x, y} = cell_to_screen(cell);
        if (x > 480 - 32)
            continue;

        let prev_fill_style = c.fillStyle;
        if (cell != critter) {
            c.fillStyle = `hsla(
                    ${score * 255 / 15}, 100%, 50%, ${0.2 - score / 75}`;
            c.fillRect(x, y, 24, 24);
        }
        c.fillStyle = `rgba(255, 255, 255, ${0.5 - score / 30}`;
        c.font = "16px monospace";
        c.fillText(score, x + 2, y + 16);
        c.fillStyle = prev_fill_style;
    }

    return true;
}

function DEBUG_flee_region() {
    if (!DEBUG)
        return true;

    for (let [cell, score] of world.entries()) {
        if (isNaN(score) || score === 0 || score > 15)
            continue;

        let {x, y} = cell_to_screen(cell);
        if (x > 480 - 32)
            continue;

        let prev_fill_style = c.fillStyle;
        if (score > world[critter]) {
            c.fillStyle = `hsla(
                    ${score * 255 / 15}, 100%, 50%, ${0.33 - score / 45}`;
            c.fillRect(x, y, 24, 24);
        }
        c.fillStyle = prev_fill_style;
    }

    return true;
}

function DEBUG_critter_deciding(cell, {final}) {
    if (!DEBUG)
        return true;

    let {x, y} = cell_to_screen(cell);
    if (x < 480) {
        let prev_fill_style = c.fillStyle;
        c.fillStyle = final ?
                `hsla(128, 100%, 50%, 0.5)`:
                `hsla(200, 100%, 50%, 0.5)`;
        c.fillRect(x, y, 24, 24);
        c.fillStyle = prev_fill_style;
    }

    return true;
}