# -*- coding: utf-8 -*-

ROTATION = {0: 0,
            BOTTOM: 0,
            DOWN: 0,
            1: HALF_PI,
            LEFT: HALF_PI,
            2: PI,
            TOP: PI,
            UP: PI,
            3: PI + HALF_PI,
            RIGHT: PI + HALF_PI,
            BOTTOM + RIGHT: 0,
            DOWN + RIGHT: 0,
            DOWN + LEFT: HALF_PI,
            BOTTOM + LEFT: HALF_PI,
            TOP + LEFT: PI,
            UP + LEFT: PI,
            TOP + RIGHT: PI + HALF_PI,
            UP + RIGHT: PI + HALF_PI,
            }

def quarter_circle(x, y, radius, quadrant):
    circle_arc(x, y, radius, ROTATION[quadrant], HALF_PI)

def half_circle(x, y, radius, quadrant):
    circle_arc(x, y, radius, ROTATION[quadrant], PI)

def circle_arc(x, y, radius, start_ang, sweep_ang):
    arc(x, y, radius * 2, radius * 2, start_ang, start_ang + sweep_ang)

def poly_arc(x, y, radius, start_ang, sweep_ang, num_points=2):
    angle = sweep_ang / int(num_points)
    a = start_ang
    with beginShape():
        while a <= start_ang + sweep_ang:
            sx = x + cos(a) * radius
            sy = y + sin(a) * radius
            vertex(sx, sy)
            a += angle

def arc_poly(x, y, d, _, start_ang, end_ang, num_points=5):
    sweep_ang = end_ang - start_ang
    angle = sweep_ang / int(num_points)
    a = start_ang
    with beginShape():
        while a <= end_ang:
            sx = x + cos(a) * d / 2
            sy = y + sin(a) * d / 2
            vertex(sx, sy)
            a += angle

def bar(x1, y1, x2, y2, thickness=None, shorter=0, ends=(1, 1)):
    """
    O código para fazer as barras, dois pares (x, y),
    um parâmetro de encurtamento: shorter
    """
    L = dist(x1, y1, x2, y2)
    if not thickness:
        thickness = 10
    with pushMatrix():
        translate(x1, y1)
        angle = atan2(x1 - x2, y2 - y1)
        rotate(angle)
        offset = shorter / 2
        line(thickness / 2, offset, thickness / 2, L - offset)
        line(-thickness / 2, offset, -thickness / 2, L - offset)
        if ends[0]:
            half_circle(0, offset, thickness / 2, UP)
        if ends[1]:
            half_circle(0, L - offset, thickness / 2, DOWN)

def var_bar(p1x, p1y, p2x, p2y, r1, r2=None):
    if r2 is None:
        r2 = r1
    d = dist(p1x, p1y, p2x, p2y)
    if d > 0:
        with pushMatrix():
            translate(p1x, p1y)
            angle = atan2(p1x - p2x, p2y - p1y)
            rotate(angle + HALF_PI)
            ri = r1 - r2
            beta = asin(ri / d) + HALF_PI
            x1 = cos(beta) * r1
            y1 = sin(beta) * r1
            x2 = cos(beta) * r2
            y2 = sin(beta) * r2
            with pushStyle():
                noStroke()
                beginShape()
                vertex(-x1, -y1)
                vertex(d - x2, -y2)
                vertex(d, 0)
                vertex(d - x2, +y2)
                vertex(-x1, +y1)
                vertex(0, 0)
                endShape(CLOSE)
            line(-x1, -y1, d - x2, -y2)
            line(-x1, +y1, d - x2, +y2)
            arc(0, 0, r1 * 2, r1 * 2,
                -beta - PI, beta - PI)
            arc(d, 0, r2 * 2, r2 * 2,
                beta - PI, PI - beta)
    else:
        ellipse(p1x, p1y, r1 * 2, r1 * 2)
        ellipse(p2y, p2x, r2 * 2, r2 * 2)