football

int
    // ball
    x,
    y,
    speed,

    // gates
    w, // half width
    h, // half height
    weight,
    angle;

void setup() {
    size(1280, 740);
    rectMode (CENTER);

    x = width / 2;
    y = height;
    speed = - (height / 50);

    w = width / 6; // half width
    h = width / 10; // half height
    weight = width / 60;
    angle = w / 4;
}

void ball () {
    y += speed;
    if (
        (y < 0) || (
            x > mouseX - w &&
            x < mouseX + w &&
            y < mouseY &&
            y > mouseY - h
        )
    ) {
        y = height;
        x = int (random(width));
    }

    noStroke();
    fill (255);
    circle (x, y, height / 10);
}

void gates () {
    strokeWeight(weight);
    stroke (0);
    noFill ();

    rect ( // back
        mouseX + angle, mouseY - angle,
        w * 2, h * 2,
        width / 500 // suapvalinimas
    );

    // front
    line ( // upper
        mouseX - w, mouseY - h,
        mouseX + w, mouseY - h
    );
    line ( // left
        mouseX - w, mouseY - h,
        mouseX - w, mouseY + h
    );
    line ( // right
        mouseX + w, mouseY - h,
        mouseX + w, mouseY + h
    );

    // angle
    line ( // left top
        mouseX - w,
        mouseY - h,
        mouseX - w + angle,
        mouseY - h - angle
    );
    line ( // left bottom
        mouseX - w,
        mouseY + h,
        mouseX - w + angle,
        mouseY + h - angle
    );
    line ( // right top
        mouseX + w,
        mouseY - h,
        mouseX + w + angle,
        mouseY - h - angle
    );
    line ( // right bottom
        mouseX + w,
        mouseY + h,
        mouseX + w + angle,
        mouseY + h - angle
    );
}

void draw () {
    background (125, 255, 125);
    gates ();
    //net ();
    ball();
}