day 54

s054/s054.pyde

@@ -0,0 +1,111 @@
+"""
+sketch 54 180223 - Alexandre B A Villares
+https://abav.lugaralgum.com/sketch-a-day
+"""
+from collections import namedtuple
+import random as rnd
+
+SPACING, MARGIN = 120, 120
+X_LIST, Y_LIST = [], []  # listas de posições para elementos
+NUM_NODES = 12  # número de elementos do desenho / number of nodes
+Node = namedtuple(
+    'Node', ['x', 'y', 't_size', 's_weight', 'is_arrow', 'points_to'])
+DESENHO = []  # lista dos elementos, 'nodes', do desenho
+
+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()
+    println("'s' to save, and 'n' for a new drawing")
+
+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_arrow? (se é seta ou 'linha')
+        []  # points_to... (lista com ref. a outro elem.))
+    )
+
+def novo_desenho():
+    """
+    esvazia a lista elementos (setas e linhas) do desenho anterior
+    clears the list of nodes and creates a a new drawing appending DESENHO,
+    a list of nodes/drawing elements: arrows, connecting lines and lonely nodes
+    """
+    DESENHO[:] = []
+    for _ in range(NUM_NODES):
+        DESENHO.append(new_node())
+    for node in DESENHO:  # para cada elemento do desenho
+        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)
+  
+    # the previous process might generate non-point nodes / podem haver nós
+    # que não apontam
+    lonely_nodes = [n for n in DESENHO if not n.points_to]
+    # check if there at least one non-pointing node
+    if not lonely_nodes:
+        # I want at least one (non-pointing nodes will be red)
+        DESENHO.append(new_node())
+
+def seta(x1, y1, x2, y2, shorter=0, head=None,
+    tail_func=None, tail_size=None):
+    """
+    O código para fazer as setas, dois pares (x, y),
+    um parâmetro de encurtamento: shorter
+    e para o tamanho da cabeça da seta: head
+    """
+    L = dist(x1, y1, x2, y2)
+    if not head:
+        head = max(L / 10, 10)
+    with pushMatrix():
+        translate(x1, y1)
+        angle = atan2(x1 - x2, y2 - y1)
+        rotate(angle)
+        offset = shorter / 2
+        strokeCap(ROUND)
+        line(0, L - offset, -head / 3, L - offset - head)
+        line(0, L - offset, head / 3, L - offset - head)
+        strokeCap(SQUARE)
+        line(0, offset, 0, L - offset)
+        if tail_func and tail_size:
+            tail_func(0, 0, tail_size, tail_size)
+ 
+def draw():
+    background(200)
+    # draws white 'lines', non-arrows, first.
+    for node in (n for n in DESENHO if not n.is_arrow):
+        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_arrow:
+            rect(node.x, node.y, node.t_size, node.t_size)
+        else:    
+            ellipse(node.x, node.y, node.t_size, node.t_size)
+    # then draws black arrows
+    for node in (n for n in DESENHO if n.is_arrow):
+        for other in node.points_to:  # se estiver apontando para alguém
+            strokeWeight(node.s_weight)
+            stroke(0)
+            seta(node.x, node.y, other.x, other.y,
+                 node.t_size, node.s_weight * 5,
+                 rect, node.t_size)
+
+def keyPressed():
+    if key == 's':
+        saveFrame("####.png")
+    if key == 'n':
+        novo_desenho()

s054/sketch.properties

@@ -0,0 +1,2 @@
+mode=Python
+mode.id=jycessing.mode.PythonMode