kopia lustrzana https://github.com/villares/sketch-a-day
158 wiersze
4.1 KiB
Plaintext
158 wiersze
4.1 KiB
Plaintext
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"""
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Alexandre B A Villares - https://abav.lugaralgum.com/sketch-a-day
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- Unfolding piramids
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"""
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# add_library('GifAnimation')
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# from gif_exporter import gif_export
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CORTE = color(255, 0, 0)
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DOBRA = color(0, 0, 255)
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raio_externo, raio_interno = 100, 50
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lados = 5
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def setup():
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size(400, 600, P3D)
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hint(ENABLE_DEPTH_TEST)
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hint(ENABLE_DEPTH_SORT)
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def draw():
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background(240)
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translate(width / 2, height / 4 + 50)
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pushMatrix()
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rotateX(radians(45))
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rotateZ(radians(frameCount / 3.))
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fill(255, 200)
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stroke(0)
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strokeWeight(2)
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pontos = piramide_3D(lados, raio_externo, raio_interno)
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popMatrix()
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translate(0, height / 2 - 50)
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piramide_desdobrada(pontos)
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def piramide_3D(np, re, ri):
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# calculando os pontos
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pontos = []
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n = np * 2
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for i in range(n):
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ang = radians(i * 360. / n)
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if i % 2 == 0:
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r = ri
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else:
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r = re
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x = sin(ang) * r
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y = cos(ang) * r
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pontos.append((x, y))
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# arestas da base
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pontos_base = pontos[::2]
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pontos_base2 = pontos_base[1:] + [pontos_base[0]]
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arestas_base = zip(pontos_base, pontos_base2)
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# calculo da altura
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(p0x, p0y), (p1x, p1y) = pontos[0], pontos[1]
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lado = dist(p0x, p0y, p1x, p1y)
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h_squared = lado * lado - ri * ri
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if h_squared > 0: # se a altura viavel
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h = sqrt(h_squared)
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for aresta in arestas_base:
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p1, p2 = aresta
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beginShape()
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vertex(*p1)
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vertex(*p2)
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vertex(0, 0, h)
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endShape(CLOSE)
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# sempre desenha a base
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beginShape()
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for ponto in pontos_base:
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vertex(*ponto)
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endShape(CLOSE)
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# devolve os pontos para usar no 2D!
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return pontos
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def piramide_desdobrada(pontos):
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noFill()
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# dobras da base
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stroke(DOBRA)
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beginShape()
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for ponto in pontos[::2]:
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vertex(*ponto)
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endShape(CLOSE)
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# arestas laterais
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lista_b = pontos[1:] + [pontos[0]]
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arestas = zip(pontos, lista_b)
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for i, aresta in enumerate(arestas):
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p1, p2 = aresta
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stroke(CORTE)
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if i % 2 == 0:
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# abas de cola
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glue_tab(p2, p1, 10, )
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# dobra
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stroke(DOBRA)
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line(p2[0], p2[1], p1[0], p1[1])
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else:
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# outra aresta cortada
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line(p1[0], p1[1], p2[0], p2[1])
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def glue_tab(p1, p2, tab_w, cut_ang=QUARTER_PI / 3):
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"""
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draws a trapezoidal or triangular glue tab along edge defined by p1 and p2,
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with width tab_w and cut angle a
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"""
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al = atan2(p1[0] - p2[0], p1[1] - p2[1])
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a1 = al + cut_ang + PI
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a2 = al - cut_ang
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# calculate cut_len to get the right tab width
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cut_len = tab_w / sin(cut_ang)
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f1 = (p1[0] + cut_len * sin(a1),
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p1[1] + cut_len * cos(a1))
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f2 = (p2[0] + cut_len * sin(a2),
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p2[1] + cut_len * cos(a2))
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edge_len = dist(p1[0], p1[1], p2[0], p2[1])
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if edge_len > 2 * cut_len * cos(cut_ang): # 'normal' trapezoidal tab
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beginShape()
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vertex(*p1) # vertex(p1[0], p1[1])
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vertex(*f1)
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vertex(*f2)
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vertex(*p2)
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endShape()
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else: # short triangular tab
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fm = ((f1[0] + f2[0]) / 2, (f1[1] + f2[1]) / 2)
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beginShape()
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vertex(*p1)
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vertex(*fm) # middle way of f1 and f2
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vertex(*p2)
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endShape()
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def keyPressed():
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global raio_interno, raio_externo, lados
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if keyCode == UP:
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raio_externo += 5
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if keyCode == DOWN:
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raio_externo -= 5
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if keyCode == LEFT:
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raio_interno += 5
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if keyCode == RIGHT:
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raio_interno -= 5
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if key == "+":
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lados += 1
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if key == "-" and lados > 3:
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lados -= 1
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# if key == "g":
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# gif_export(GifMaker, filename=SKETCH_NAME)
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def settings():
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from os import path
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global SKETCH_NAME
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SKETCH_NAME = path.basename(sketchPath())
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OUTPUT = ".gif"
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println(
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"""
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[{0}](https://github.com/villares/sketch-a-day/tree/master/{2}/{0}) [[Py.Processing](https://villares.github.io/como-instalar-o-processing-modo-python/index-EN)]
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""".format(SKETCH_NAME, OUTPUT, year())
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)
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