kopia lustrzana https://github.com/villares/sketch-a-day
109 wiersze
3.1 KiB
Python
109 wiersze
3.1 KiB
Python
# Alexandre B A Villares - https://abav.lugaralgum.com/sketch-a-day
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# More combinatorics of triangles in grids based on sektch_190602a
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# Lerp to make intermediary triangles
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from itertools import product, combinations
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space, border = 16, 20
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def setup():
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global two_triangle_combos, W, H
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size(1240, 648)
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blendMode(MULTIPLY)
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strokeJoin(ROUND)
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# points on a 3x3 grid
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grid = product((-1, 0, 1), repeat=2)
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# all 3-point combinations on the grid
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points = combinations(grid, 3)
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# identify triangles (discard colinear point triples)
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triangles = []
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for p in points:
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area = (p[1][0] * (p[2][1] - p[0][1]) +
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p[2][0] * (p[0][1] - p[1][1]) +
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p[0][0] * (p[1][1] - p[2][1]))
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if area != 0:
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triangles.append(p)
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println("Number of possible triangles: {}"
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.format(len(triangles)))
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# calculate 2-triangle combinations
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two_triangle_combos = list(combinations(triangles, 2))
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println("Number of 2-triangle combinations: {}"
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.format(len(two_triangle_combos)))
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# calculate display grid
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W = (width - border * 2) // space
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H = (height - border * 2) // space
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println("Cols: {} Rows: {}"
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.format(W, H))
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noLoop()
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def draw():
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background(240)
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i = 0
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for y in range(H):
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for x in range(W):
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if i < len(two_triangle_combos):
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pushMatrix()
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translate(border + space / 2 + space * x,
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border + space / 2 + space * y)
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draw_combo(two_triangle_combos[i])
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popMatrix()
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i += 1
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def draw_combo(combo):
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noFill()
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siz = space * .5 # .35
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triangles = (combo[0],
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lerp_poly(combo[0], combo[1], 0.33),
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lerp_poly(combo[0], combo[1], 0.66),
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combo[1])
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for i, t in enumerate(triangles):
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# colors for each of the triangles
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colors = (color(200, 100, 0),
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color(133, 100, 66),
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color(66, 100, 33),
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color(0, 100, 200))
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stroke(colors[i])
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draw_poly(scale_poly(t, siz))
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def draw_poly(p_list, closed=True):
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beginShape()
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for p in p_list:
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if len(p) == 2 or p[2] == 0:
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vertex(p[0], p[1])
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else:
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vertex(*p)
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if closed:
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endShape(CLOSE)
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else:
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endShape()
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def lerp_poly(p0, p1, t):
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pt = []
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for sp0, sp1 in zip(p0, p1):
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pt.append((lerp(sp0[0], sp1[0], t),
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lerp(sp0[1], sp1[1], t)))
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return pt
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def scale_poly(p_list, s):
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return [(p[0] * s, p[1] * s) for p in p_list]
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def keyPressed():
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if key == "s":
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saveFrame(SKETCH_NAME + OUTPUT)
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def settings():
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""" print markdown to add at the sketch-a-day page"""
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from os import path
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global SKETCH_NAME, OUTPUT
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SKETCH_NAME = path.basename(sketchPath())
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OUTPUT = ".png"
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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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