# Retículas

## `hackmd.io/@sesc-av-paulista/estudos-em-python-10-abril`

- Referênca: https://abav.lugaralgum.com/material-aulas/Processing-Python-py5/reticulas.html

Carrega imagem

def setup():
    global img
    size(600, 400)
    img = load_image('piscina.png')
    print(img.width, img.height)
    if img.width > img.height:
        encolher = width / img.width  # 600 / 800
        largura_encolhida = img.width * encolher
        altura_encolhida = img.height * encolher
        margem_v = (height - altura_encolhida) / 2
        margem_h = 0
    else:
        encolher = height / img.height
        largura_encolhida = img.width * encolher
        altura_encolhida = img.height * encolher
        margem_v = 0
        margem_h = (width - largura_encolhida) / 2
    image(img, margem_h, margem_v, largura_encolhida, altura_encolhida)

Amostras de pixels da imagem

def setup():
    global img
    size(600, 400)
    img = load_image('piscina.png')
    
def draw():
    prop = width / height
    offset_x = mouse_x
    offset_y = mouse_y
    largura_amostra = 400
    altura_amostra = largura_amostra  / prop
    
    for _ in range(1000):
        xt = random(width) # 
        yt = random(height)  # 
        xi = int(remap(xt, 0, width, 0, largura_amostra))
        yi = int(remap(yt, 0, height, 0, altura_amostra))
        cor = img.get_pixels(offset_x + xi,
                             offset_y + yi) # int, int
        fill(cor)
        no_stroke()
        circle(xt, yt, 5)
    

Retícula 1


colunas = 100

def setup():
    global img
    size(600, 400)
    img = load_image('piscina.png')
    
def draw():
    background(0)
    prop = width / height
    offset_x = 0
    offset_y = 0
    largura_amostra = 800
    altura_amostra = largura_amostra  / prop

    tam = width / colunas
    filas = int(height / tam)
    for coluna in range(colunas):
        for fila in range(filas):
            xt = coluna * tam + tam / 2
            yt = fila * tam + tam/ 2
            xi = int(remap(xt, 0, width, 0, largura_amostra))
            yi = int(remap(yt, 0, height, 0, altura_amostra))
            cor = img.get_pixels(offset_x + xi,
                                 offset_y + yi) # int, int
            fill(cor)
            no_stroke()
            circle(xt, yt, tam)
    
  
def key_pressed():
    global colunas
    if key == 'a':
        colunas += 1
    elif key == 'z' and colunas > 1:
        colunas -= 1

PB

colunas = 100

def setup():
    global img
    size(600, 400)
    img = load_image('piscina.png')
    
def draw():
    background(255)
    prop = width / height
    offset_x = 0
    offset_y = 0
    largura_amostra = 800
    altura_amostra = largura_amostra  / prop

    tam = width / colunas
    filas = int(height / tam)
    for coluna in range(colunas):
        for fila in range(filas):
            xt = coluna * tam + tam / 2
            yt = fila * tam + tam/ 2
            xi = int(remap(xt, 0, width, 0, largura_amostra))
            yi = int(remap(yt, 0, height, 0, altura_amostra))
            cor = img.get_pixels(offset_x + xi,
                                 offset_y + yi) # int, int
            fill(0)
            no_stroke()
            b = 255 - brightness(cor)
            d = b / 240 * tam
            circle(xt, yt, d)
   
def key_pressed():
    global colunas
    if key == 'a':
        colunas += 1
    elif key == 'z' and colunas > 1:
        colunas -= 1

Pixelizado


colunas = 50

def setup():
    global img
    size(600, 400)
    img = load_image('piscina.png')
    rect_mode(CENTER)
    
def draw():
    background(0)
    prop = width / height
    offset_x = 0
    offset_y = 0
    largura_amostra = 600
    altura_amostra = largura_amostra  / prop

    tam = width / colunas
    filas = int(height / tam)
    for coluna in range(colunas):
        for fila in range(filas):
            xt = coluna * tam + tam / 2
            yt = fila * tam + tam/ 2
            xi = int(remap(xt, 0, width, 0, largura_amostra))
            yi = int(remap(yt, 0, height, 0, altura_amostra))
            cor = img.get_pixels(offset_x + xi,
                                 offset_y + yi) # int, int
            color_mode(HSB) # matiz, sat, bri
            b = brightness(cor)
            matiz = hue(cor)
            #fill(matiz, 255, 255)
            fill(cor)
            no_stroke()
            d = b / 255 * tam
            square(xt, yt, tam)
   
def key_pressed():
    global colunas
    if key == 'a':
        colunas += 1
    elif key == 'z' and colunas > 1:
        colunas -= 1

Cor saturada



colunas = 150

def setup():
    global img
    size(600, 400)
    img = load_image('piscina.png')
    rect_mode(CENTER)
    
def draw():
    background(0)
    prop = width / height
    offset_x = 0
    offset_y = 0
    largura_amostra = 600
    altura_amostra = largura_amostra  / prop

    tam = width / colunas
    filas = int(height / tam)
    for coluna in range(colunas):
        for fila in range(filas):
            xt = coluna * tam + tam / 2
            yt = fila * tam + tam/ 2
            xi = int(remap(xt, 0, width, 0, largura_amostra))
            yi = int(remap(yt, 0, height, 0, altura_amostra))
            cor = img.get_pixels(offset_x + xi,
                                 offset_y + yi) # int, int
            color_mode(HSB) # matiz, sat, bri
            b = brightness(cor)
            matiz = hue(cor)
            fill(matiz, 255, 255)
            #fill(cor)
            no_stroke()
            d = b / 255 * tam
            square(xt, yt, d)
   
def key_pressed():
    global colunas
    if key == 'a':
        colunas += 1
    elif key == 'z' and colunas > 1:
        colunas -= 1