{
"id": "216",
"prompt": "Barber-shop op-art: diagonal red and cream stripes from the band test ((x + y + t*2) / thickness) & 1 over 8px cells, where the stripe thickness itself breathes between 16 and 46 px on a triangle wave of t. The scroll and the breathing together give a warping illusion.",
"solution_rl": "fn frame(t: i32) {\n let w: i32 = host::display::width();\n let h: i32 = host::display::height();\n let cell: i32 = 8;\n let p: i32 = t % 120;\n let tri: i32 = if p > 60 { 120 - p } else { p };\n let th: i32 = 16 + tri / 2;\n let mut y: i32 = 0;\n while y < h {\n let mut x: i32 = 0;\n while x < w {\n let band: i32 = ((x + y + t * 2) / th) & 1;\n let c: i32 = if band == 0 { 0xc0261f } else { 0xf2ede4 };\n host::display::fill_rect(x, y, cell, cell, c);\n x = x + cell;\n }\n y = y + cell;\n }\n host::display::present();\n}\n",
"tags": [
"generative",
"animation",
"math",
"grid"
]
}