190202

2019/sketch_190202a/arcs.py

@@ -0,0 +1,103 @@
+# -*- 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)

2019/sketch_190202a/sketch_190202a.pyde

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+# Alexandre B A Villares - https://abav.lugaralgum.com/sketch-a-day
+SKETCH_NAME, OUTPUT = "sketch_190202a", ".gif" 
+
+"""
+A retake of sketch 57 180226 + work from 190201 :)
+"""
+
+from arcs import var_bar
+from collections import namedtuple
+import random as rnd
+
+SPACING, MARGIN = 120, 120
+X_LIST, Y_LIST = [], []  # listas de posições para elementos
+DESENHO = []  # lista dos elementos, 'nodes', do desenho
+NUM_NODES = 8  # número de elementos do desenho / number of nodes
+Node = namedtuple(
+    'Node', ['x', 'y', 't_size', 's_weight', 'is_special', 'points_to'])
+
+def setup():
+    size(600, 600)
+    rectMode(CENTER)
+    noFill()
+    X_LIST[:] = [x for x in range(MARGIN, 1 + width - MARGIN, SPACING)]
+    Y_LIST[:] = [y for y in range(MARGIN, 1 + height - MARGIN, SPACING)]
+    novo_desenho(DESENHO)
+    #println("'s' to save, and 'n' for a new drawing")
+
+def keyPressed():
+    if key == 's':
+        saveFrame("####.png")
+    if key == 'r':
+        make_nodes_point(DESENHO)
+    if key == 'n':
+        novo_desenho(DESENHO)
+
+def novo_desenho(desenho):
+    """
+    esvazia a lista elementos (barras arredondadas e linhas) do desenho anterior
+    clears the list of nodes and creates a a new drawing appending DESENHO,
+    a list of nodes/drawing elements: special bars, connecting lines and lonely nodes
+    """
+    desenho[:] = []
+    for _ in range(NUM_NODES):
+        desenho.append(new_node())
+    make_nodes_point(desenho)
+
+def new_node():
+    return Node(                   # elemento/"nó" uma namedtuple com:
+        rnd.choice(X_LIST),        # x
+        rnd.choice(Y_LIST),        # y
+        rnd.choice([10, 20, 30]),  # t_size (tail/circle size)
+        rnd.choice([2, 4, 6]),     # s_weight (espessura da linha)
+        rnd.choice([True, False]),  # is_special? (se é barra ou 'linha')
+        []  # points_to... (lista com ref. a outro elem.))
+    )
+
+def make_nodes_point(desenho):
+    for node in desenho:  # para cada elemento do desenho
+        node.points_to[:] = []
+        random_node = rnd.choice(desenho)  # sorteia outro elemento
+        if (node.x, node.y) != (random_node.x, random_node.y):
+            # 'aponta' para este elemento, acrescenta na sub_lista
+            node.points_to.append(random_node)
+
+def draw():
+    background(200)
+    # draws white 'lines', non-specials, first.
+    for node in (n for n in DESENHO if not n.is_special):
+        for other in node.points_to:  # se estiver apontando para alguém
+            strokeWeight(node.s_weight)
+            stroke(255)
+            line(node.x, node.y, other.x, other.y)
+            # desenha o círculo (repare que só em nós que 'apontam')
+            ellipse(node.x, node.y, node.t_size, node.t_size)
+    # then draws 'lonely nodes' in red (nodes that do not point anywhere)
+    for node in (n for n in DESENHO if not n.points_to):
+        strokeWeight(node.s_weight)
+        stroke(255, 0, 0)  # red stroke for lonely nodes
+        if node.is_special:
+            rect(node.x, node.y, node.t_size, node.t_size, node.s_weight * 3)
+        else:
+            ellipse(node.x, node.y, node.t_size, node.t_size)
+    # then draws black specials
+    for node in (n for n in DESENHO if n.is_special):
+        for other in node.points_to:  # se estiver apontando para alguém
+            strokeWeight(node.s_weight)
+            stroke(0)
+            var_bar(node.x, node.y, other.x, other.y,
+                    node.t_size, node.s_weight * 5)
+
+# print text to add to the project's README.md
+def settings():
+    println(
+        """
+![{0}](2019/{0}/{0}{1})
+
+[{0}](https://github.com/villares/sketch-a-day/tree/master/2019/{0}) [[Py.Processing](https://villares.github.io/como-instalar-o-processing-modo-python/index-EN)]
+""".format(SKETCH_NAME, OUTPUT)
+    )