Hi! I'm [Alexandre Villares](https://abav.lugaralgum.com), let's see if I can make one small program (*sketch*) a day. I'm working mostly with Python ([Processing Python Mode](https://villares.github.io/como-instalar-o-processing-modo-python/index-EN)) and sometimes [Processing Java Mode](https://processing.org) and [P5JS (JavaScript)](p5js.org) or other stuff. If you enjoy this, be a [patreon](https://patreon.com/arteprog) or make a donation [here](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=HCGAKACDMVNV2) Feel free to [contact me](http://contato.lugaralgum.com) regarding licenses to use my work, teaching opportunities, consulting or other projects.

# sketch-a-day ### one visual idea a day [on GitHub!] Hi! I'm Alexandre Villares, let's see if I can make one small program (sketch) a day. I'm working mostly with Python (Processing Python Mode) and sometimes Processing Java Mode and P5JS (JavaScript) or other stuff. If you enjoy this, be a patreon or make a donation here Feel free to contact me regarding licenses to use my work, teaching opportunities, consulting or other projects.

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A 3D take on 314

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Horizontaly connected 314

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Isolating elements from 313

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Hatches parallel to opposed sides.

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Tried to supress some vertices from the hatch grid.

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Cross hatch and, a simplified "cell" polygon drawing and selective non-random verticies (if pos % 3 == 0)

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Inclined hatches

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First hatch attempt on a random "cell" grid. Each cell has 4 "node" vertices

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Changed my internal point grid to "pixels"

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Demo of how the "inside poly" test works from from my lines intersecting poly function.

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Testing if a point is inside a poly to make a grid/retucule. Advancing from my lines intersecting poly function.

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Playing with my code for lines intersecting polygons.

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The polygons now are non-self-intersecting, and the hatches are kept inside :) White lines in the background are from discarded random polys that self-intersected.

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True arcs and lines

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Ellipse arcs

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First attempt at joining rectangular cells into bigger polygonal faces.

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This sorts a gliph sequence from lighter to darker

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268: code[Py.Processing] & code[Pygame]

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This was kind of a dead end. It's easy to rotate stuff with pushMatrix(), transtlate() and rotate(), but it doesn't work inside beginShape() as I found out the next day.

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Animation

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Now (hollow) boxes, and a cutting-plane controlled by the keyboard.

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Tubes! Solid boxes hollowed in one of three directions.

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Two layer version. Added rotateX(rot).

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One layer version, I'll use it to test some ideas another day.

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At each cycle, it starts on the next node.

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A big one, animated the maze generation process.

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A bigger one

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185: code [Processing Java]

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    def set_nbs(self):
        self.nbs, self.unvisited_nbs = [], []
        for node in Node.nodes:
            if node != self and dist(node.x, node.y, node.z,
                                     self.x, self.y, self.z) <= Node.spacing * 1.1:
                self.nbs.append(node)
                self.unvisited_nbs.append(node)

if node != self and dist(node.x, node.y, node.z,
                         self.x, self.y, self.z) <= Node.spacing * 1.5:

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171:Java code[Processing Java] & Python code [Py.Processing]

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Now same Z lines can form floors.

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No random movement in Z so no line connections between different (Z) levels. Comparing lines with different Zs to create translucent 'walls'.

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167: Java code [Processing Java] & Python code [Py.Processing]

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(#152 revisited in 3D :)

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Perlin Noise "walker" + ?

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Perlin Noise "walker" + eye

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Interactive genetic algorithm

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140 + 141 + 142 code [Py.Processing]

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s140: code [Py.Processing]

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Revisiting ideas of recursion from s071

Heavy animated GIF: s138.gif

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s137: code [Py.Processing]

PDF: diagram.pdf

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Maybe I fixed it, I guess, not sure…

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BROKEN!

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To be brutally honest, I had no idea that reversing the second random grid would bring me this result!

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Hexagons!

​```python def hexagon(x, y, r): ​ with pushMatrix(): ​ translate(x, y) ​ beginShape() ​ for i in range(6): ​ vx = cos(i * TWO_PI /6) * r ​ vy = sin(i * TWO_PI /6) * r ​ vertex(vx, vy) ​ endShape(CLOSE)

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![s111](s111/s111.gif)

111: [code](https://github.com/villares/sketch-a-day/tree/master/s111)  [[Py.Processing](https://villares.github.io/como-instalar-o-processing-modo-python/index-EN)]

Now I 'fixed' the rotation with propper pushMatrix() and translate()

​```python
        with pushMatrix():
            translate(x0,y0)
            rotate(fs0)
            stroke(st0)
            equilateral(0, 0, fs0)
        with pushMatrix():
            translate(x1,y1)
            rotate(fs1)
            stroke(st1)
            equilateral(0, 0, fs1)
        with pushMatrix():
            translate(x2,y2)
            rotate(fs2)
            stroke(st2)
            equilateral(0, 0, fs2)

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110: code [Py.Processing]

Just added some rotations to mess things up. It's "wrong", but I like it!

        rotate(fs0)
        stroke(st0)
        equilateral(x0, y0, fs0)
        stroke(st1)
        rotate(fs1)
        equilateral(x1, y1, fs1)
        stroke(st2)
        rotate(fs2)
        equilateral(x2, y2, fs2)

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109: code [Py.Processing]

colorMode(HSB)
...
C = color(map(final_size,-63 , 63, 0, 255), 255, 255)
                          

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108: code [Py.Processing]

colorMode(HSB)
...
C = color(map(abs(final_size), 0, 63, 0, 255), 255, 255)

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107: code [Py.Processing]

Inverting odd rows

  v = spac_size * 1.5
    h = spac_size * sqrt(3)
    for ix in range(-1, grid_elem + 1):
        for iy in range(-1, grid_elem + 1):
            if iy % 2:
                x = ix * h + h / 4
                es = elem_size
            else:
                x = ix * h - h / 4
                es = -elem_size
            y = iy * v
            for i in range(3):
                final_size = es * (i + 0.5)
                C = map(final_size, 0, 63, 0, 255)
                oX = rand_posi * random(-1, 1)
                oY = rand_posi * random(-1, 1)
                ELEMENTS.append((C, x + oX, y + oY, final_size))

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106: code [Py.Processing]

Lazy triangles

def equilateral(x, y, r):
    with pushMatrix():
        translate(x, y)
        triangle(-0.866 * r, -0.5 * r,
                  0.866 * r, -0.5 * r,
                  0.000 * r,  1.0 * r) 
                  # I know... 0 * r and 1 * r...

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105: code [Py.Processing]

Layers now have different "base" sizes (0.5, 1.5 and 2.5 times base size). Removed lines for now.

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104: code [Py.Processing]

Back to stroke variation

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103: code [Py.Processing]

Layers but only black strokes

    spac_size = width / (grid_elem + 1)
    v = spac_size * 1.5
    h = spac_size * sqrt(3)
    for ix in range(-1, grid_elem + 1):
        for iy in range(-1, grid_elem + 1):
            if iy % 2:
                x = ix * h + h / 4
            else:
                x = ix * h - h / 4
            y = iy * v
            for i in range(3):
                final_size = elem_size + rand_size * random(-1, 1)
                ELEMENTS.append((x, y, final_size))
    # three layers of elements            
    for i in range(3):
        offsetX = rand_posi * random(-1, 1)
        offsetY = rand_posi * random(-1, 1)
        for elem in ELEMENTS[i::3]:
            x, y, es = elem
            ellipse(x + offsetX, y + offsetY, es, es)

    for _ in range(grid_elem):
        x1, y1, es1 = rnd_choice(ELEMENTS)
        x2, y2, es2 = rnd_choice(ELEMENTS)
        line(x1, y1, x2, y2)

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102: code [Py.Processing]

    spac_size = width / (grid_elem + 1)
    v = spac_size * 1.5
    h = spac_size * sqrt(3)
    for ix in range(-1, grid_elem + 1):
        for iy in range(-1, grid_elem + 1):
            if iy % 2:
                x = ix * h + h / 4
            else:
                x = ix * h - h / 4
            y = iy * v
            final_size = elem_size + rand_size * random(-1, 1)
            offsetX = rand_posi * random(-1, 1)
            offsetY = rand_posi * random(-1, 1)
            C = map(final_size, 0, 63, 0, 255)
            ELEMENTS.append((C,
                             x + offsetX,
                             y + offsetY,
                             final_size
                             ))
    for elem in ELEMENTS:
        stroke1, x1, y1, es1 = elem
        ellipse(x1, y1, es1, es1)

    for _ in range(grid_elem):
        stroke1, x1, y1, es1 = rnd_choice(ELEMENTS)
        stroke2, x2, y2, es2 = rnd_choice(ELEMENTS)
        stroke(stroke2)
        line(x1, y1, x2, y2)

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101: code [Py.Processing]

    for _ in range(grid_elem * 2):        
        stroke1, x1, y1, es1 = rnd_choice(ELEMENTS)
        stroke(stroke1)
        ellipse(x1, y1, es1, es1)
        stroke2, x2, y2, es2 = rnd_choice(ELEMENTS)
        stroke(stroke2)
        # line
        ellipse(x2, y2, es2, es2)
        line(x1, y1, x2, y2)

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100: code [Py.Processing]

    spac_size = int(width / (grid_elem + 1))
    for _ in range(2):
        for x in range(spac_size / 2, width, spac_size): 
            for y in range(spac_size / 2, width, spac_size):
                final_size = elem_size + rand_size * random(-1, 1)
                offsetX = rand_posi * random(-1, 1)
                offsetY = rand_posi * random(-1, 1)
                C = map(final_size, 0, 63, 0, 255)
                ELEMENTS.append((C,
                                x + offsetX,
                                y + offsetY,
                                final_size
                                ))
    for stroke_c, x, y, el_size in ELEMENTS:
        stroke(stroke_c)
        ellipse(x, y, el_size, el_size)
    for _ in range(grid_elem):
        stroke_c, x1, y1, _ = rnd_choice(ELEMENTS)
        ________, x2, y2, _ = rnd_choice(ELEMENTS)
        stroke(stroke_c)
        line(x1, y1, x2, y2)

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099: code [Py.Processing]

    spac_size = int(width / (grid_elem + 1))
    for x in range(spac_size / 2, width, spac_size):  
        for y in range(spac_size / 2, width, spac_size): 
            final_size = elem_size + rand_size * random(-1, 1)
            offsetX = rand_posi * random(-1, 1)
            offsetY = rand_posi * random(-1, 1)
            GREY = map(final_size, 0, 63, 0, 255)
            stroke(GREY)
            ellipse(x + offsetX,  # desenha um círculo
                 y + offsetY,
                 final_size,
                 final_size)

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098: code [Py.Processing]

    spac_size = int(width / (grid_elem + 1))
    for x in range(spac_size / 2, width, spac_size):  
        for y in range(spac_size / 2, width, spac_size): 
            square_size = elem_size + rand_size * random(-1, 1)
            offsetX = rand_posi * random(-1, 1)
            offsetY = rand_posi * random(-1, 1)
            HUE = map(offsetX + offsetY, -128, 127, 0, 255)
            SAT = map(square_size, 0, 63, 0, 255)
            fill(HUE, SAT, 255, 200)
            rect(x + offsetX,  # desenha um quadrado
                 y + offsetY,
                 square_size,
                 square_size)

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097: code [Py.Processing]

    spac_size = int(width / (grid_elem + 1))
    for x in range(spac_size / 2, width, spac_size):
        for y in range(spac_size / 2, width, spac_size):
            # sorteia um tamanho (se o rand_size > 0)
            square_size = elem_size + rand_size * random(-1, 1)
            rect(x + rand_posi * random(-1, 1),  # desenha um quadrado
                 y + rand_posi * random(-1, 1),  
                 square_size,
                 square_size)

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096: code [Py.Processing]

More 'Inputs' helper changes (WASD & arrows for sliders). New GIF export helper actually works now! More lone nodes and edge creation changes...

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095: code [Py.Processing]

Complete rewrite of the 'Inputs' helper

# Ask user for Arduino port, uses slider if none is selected, use on `setup()`
global input
input = Input(Arduino)

# on `draw()`read analog pins 1, 2, 3, 4 or sliders
pot1 = input.analog(1)
pot2 = input.analog(2)
pot3 = input.analog(3)
pot4 = input.analog(4)

tilt = input.digital(13) # also triggered by [space bar]

# When on sliders, this draws them and checks mouse dragging / keystrokes
input.update()

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094: code [Py.Processing]

Connection 'rate' can be less than 1, prevents less than 2 nodes

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093: code [Py.Processing]

Nodes without connection are now removed

    COM_ARESTAS = set()  # para guardar pontos com aresta
    for aresta in Aresta.ARESTAS:
        if (aresta.p1 not in Ponto.SET) or (aresta.p2 not in Ponto.SET)\
                or (aresta.p1 is aresta.p2):  # arestas degeneradas
            Aresta.ARESTAS.remove(aresta)   # remove a aresta
        else:                # senão, tudo OK!
            aresta.desenha()  # desenha a linha
            aresta.puxa_empurra(TAM_ARESTA)  # altera a velocidade dos pontos
            # Adiciona ao conjunto de pontos com aresta
            COM_ARESTAS.update([aresta.p1, aresta.p2])
    Ponto.SET = COM_ARESTAS  # isto remove pontos sem nenhuma aresta
 

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092: code [Py.Processing]

Dynamic change of connection rate

if NUM_PONTOS * NUM_CONNECT > len(Aresta.ARESTAS):
        rnd_choice(list(Ponto.SET)).cria_arestas()
    elif NUM_PONTOS * NUM_CONNECT < len(Aresta.ARESTAS):
        Aresta.ARESTAS.remove(rnd_choice(Aresta.ARESTAS))

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091: code [Py.Processing]

Major rethink of my Arduino/Firmata code. I can now choose on start between sliders and potentiometers.

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090: code [Py.Processing]

Opaque strokes, no fill, randomized colours by column.

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089: code [Py.Processing]

X stroke now is translucent and grid elements have random colour inside grids.

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088: code [Py.Processing]

Filled rects, ellipses and losangles (without sktroke) and Xs

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087: code [Py.Processing]

No fill again, less colours. Variable/random number of elements per grid.

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086: code [Py.Processing]

Translucent fill & some stroke weight

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085: code [Py.Processing]

Some colour, and some crazy meddling with the Slider class...

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084: code [Py.Processing]

Make the grid's position/origin align based on the spacing size (super- grid)

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083: code [Py.Processing]

Xs and rotated rectangles

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082: code [Py.Processing]

Squares and ellipses

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081: code [Py.Processing]

Let's try some grids

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080: code [Py.Processing]

More arrows (black and white alternate by generation)

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079: code [Py.Processing]

Arrows (right black, left white)

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078: code [Py.Processing]

Color

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077: code [Py.Processing]

Random branch reduction is now less simmetric, and random seed changes on depth change.

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076: code [Py.Processing]

Stroke weight and some transparency

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075: code [Py.Processing]

... and slightly different parameters and recursion level control instead of lenght

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074: code [Py.Processing]

Adaptomg Shiffmans recusive Tree, with sliders or Pots...

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073: code [Py.Processing]

The code remains ugly :(

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072: code [Py.Processing]

Let's mix some arrows?

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071: code [Py.Processing]

Thicker and with a saturation slider (no more scale offset)

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070: code [Py.Processing]

Thicker and with a saturation slider (no more scale offset)

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069: code [Py.Processing]

Added rotation.

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068: code [Py.Processing]

... and with sliders (by Peter Farell)

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067: code [Py.Processing]

Something else.

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066: code [Py.Processing]

Arrow grid networks can be sized and placed...

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065: code [Py.Processing]

Arrow grid networks are now objects...

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064: code [Py.Processing]

Revisiting yet an older graph, adding arrows...

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063: code [Py.Processing]

Revisiting an older graph adding arrows...

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062: code [Py.Processing]

+ and - keys control the distange/range of targes in 0.5 * SPACING increments

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061: code [Py.Processing]

Sometimes we have multiple arrows now out of each node...But I reduced the range (distance) they can point to.

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060: code [Py.Processing]

Complete Object Oriented refactor...

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059: code [Py.Processing]

Back to a list of points, now every point of the grid has a node. Limited points_to random each.

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058: code [Py.Processing]

Now with some deepcopy of changeable imutable namedtuples (containing mutable lists), and some lerp()

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057: code [Py.Processing]

Revisited 54 and now I'm re-selecting random points_to nodes...

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056: code [Py.Processing]

Arrow grid moving in HSB colour space

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055: code [Py.Processing]

Grid revisited

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054: code [Py.Processing]

New arrows! With a "Tail" parameter...

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053: code [Py.Processing]

Big invisible refactor (no more point-grid to select from, now a list of possible X and Y positons to choose). On the visible side, fewer elements, and non-pointing elements redrawn in red on top.

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052: code [Py.Processing]

White lines first, black arrows on top.

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051: code [Py.Processing]

Points now on a grid.

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050: code [Py.Processing]

Arrows now...

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049: code [Py.Processing] Yet more graphs

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048: code [Py.Processing] Yet more graphs

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047: code [Py.Processing] Yet more graphs

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046: code [Py.Processing] Yet more graphs

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045: code [Py.Processing] Yet more graphs

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044: code [Py.Processing] More graphs

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043: code [Py.Processing] More graphs

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042: code [Py.Processing] Yet another interactive recursive thingy, the image on the right is shown with a key pressed

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041: code [Py.Processing] Yet another interactive recursive thingy, the image on the right is shown with a key pressed

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040: sketch_180209a [Py.Processing] More recursion

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039: sketch_180208e [Py.Processing] Manoloide inspired recursion

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038: sketch_180208d [Py.Processing] Saskia Freeke inspired grid

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037: sketch_180206b [Py.Processing] "Carnahacking is near!"

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036: sketch_180205b [Py.Processing] Added some mouse disturbance

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035: sketch_180204b [Py.Processing] Preparing for "Carnahacking"

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034: sketch_180203c [Py.Processing] Like 33 but again with "w squared" circles

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033: sketch_180202c [Py.Processing] Like 32 but again with lines

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032: sketch_180201c [Py.Processing] Like 29 but with moving points after the gesture is done

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031: sketch_180130c [Py.Processing] Like 29 but with moving points after the gesture is done

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030: sketch_180130c [Py.Processing] Like 29 but with 3D and PeasyCam orbit...

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029: sketch_180129c [Py.Processing] Like 27 but with circles

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028: sketch_180128c [Py.Processing] Like 27 but on grayscale

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027: sketch_180127c [Py.Processing]YouTube

Saving a list of points to animate colour... Mouse speed changes recorded colour & strokeWeight()

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026: sketch_180126c [Py.Processing] Mouse speed changing colour & strokeWeight()

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025c: sketch_180125b [Py.Processing] Mouse speed changing strokeWeight()

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024b: sketch_180124b [Py.Processing] Maybe tomorrow I'll try adding some sliders & movement to this graph ? [nah...]

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023b: sketch_180123b [Py.Processing] Farrel's Sliders adding random displacement

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022: missed :(

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021b: sketch_180121b [Py.Processing] Playing with Peter "Hacking Math Class" Farrel's Sliders!

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020b: sketch_180120b [Py.Processing] I was stuck on my DBN conversion sketch 20a, so this HSB shape play is 20b...

020a: sketch_180120a [Py.Processing] Refactored the code generation, removed most of the repeated vertices... C D E G O R not nice yet…

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019: sketch_180119a [Py.Processing] DBN Letters: Now working on a new approach, generating vertex/Shape code, not there yet...

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018: sketch_180118a [Py.Processing] DBN Color font? Nah…

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017: sketch_180117a [Py.Processing] John Maeda's dbnletters.dbn code from Design by Numbers on Processing Python Mode

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016: 16a [Py.Processing] Converting some Typography code from Design by Numbers, almost there!

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015: sketch_180115a [Py.Processing] Converting some Typography code from Design by Numbers, first trials

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014: sketch_180114a [Py.Processing] Another 3D Graph

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013: s180113 [Py.Processing] 3D Graph

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012: s180112 [Py.Processing] Another Graph Take

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011: s180111 [Py.Processing] A Graph Take

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010: s180110 [Py.Processing] More Manoloide inspired balls PNG (derived from a sketch by Manuel Gamboa Naon)

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009: s180109 [Py.Processing] Balls for Manoloide GIF (derived from a sketch by Manuel Gamboa Naon)

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008: s180108 [Py.Processing] Grid of Platonic Solids in Python Mode GIF

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007: s180107 [Processing Java] Another grid of Platonic Solids in Java Mode GIF

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006: s180106 [Processing Java] Grid of Platonic Solids in Java Mode GIF

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005: s180105 [p5js] Line Tetrahedrons in p5*js - interactive

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004: s180104 [Processing Java] Tetrahedrons in Java Mode- GIF

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003: s180103 [Py.Processing] Tetrahedrons Python Mode- GIF

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002: s180102 [Py.Processing] Many Stars 3D - YouTube

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001: s180101[Py.Processing] Many Stars - YouTube (inspired by my own p5js Xmas & New Year card code)