{
"id": "235",
"prompt": "A mirror-brush drawing toy: while the pointer is held, record its position into a 16-entry ring buffer packed as x*65536 + y in state slots 8..23 (head counter in another slot). Every frame redraw all buffered stamps 8-fold - the four axis mirrors plus the four swapped-coordinate reflections - with size fading by ring age and a rainbow palette. Release to freeze your mandala.",
"solution_rl": "fn frame(t: i32) {\n let w: i32 = host::display::width();\n let h: i32 = host::display::height();\n let cx: i32 = w / 2;\n let cy: i32 = h / 2;\n let down: i32 = host::display::pointer_down();\n let mut hd: i32 = host::display::state_get(2);\n if down == 1 {\n let px: i32 = host::display::pointer_x();\n let py: i32 = host::display::pointer_y();\n host::display::state_set(8 + (hd & 15), px * 65536 + py);\n hd = hd + 1;\n host::display::state_set(2, hd);\n }\n let pal = [0xff6ad5, 0x6adfff, 0xfff06a, 0x8aff6a];\n host::display::clear(0x08060c);\n let mut k: i32 = 0;\n while k < 16 {\n let v: i32 = host::display::state_get(8 + k);\n if v != 0 {\n let x: i32 = v / 65536;\n let y: i32 = v % 65536;\n let dx: i32 = x - cx;\n let dy: i32 = y - cy;\n let age: i32 = (hd - 1 - k) & 15;\n let s: i32 = 10 - age / 2;\n let c: i32 = pal[k & 3];\n host::display::fill_rect(cx + dx - s / 2, cy + dy - s / 2, s, s, c);\n host::display::fill_rect(cx - dx - s / 2, cy + dy - s / 2, s, s, c);\n host::display::fill_rect(cx + dx - s / 2, cy - dy - s / 2, s, s, c);\n host::display::fill_rect(cx - dx - s / 2, cy - dy - s / 2, s, s, c);\n host::display::fill_rect(cx + dy - s / 2, cy + dx - s / 2, s, s, c);\n host::display::fill_rect(cx - dy - s / 2, cy + dx - s / 2, s, s, c);\n host::display::fill_rect(cx + dy - s / 2, cy - dx - s / 2, s, s, c);\n host::display::fill_rect(cx - dy - s / 2, cy - dx - s / 2, s, s, c);\n }\n k = k + 1;\n }\n host::display::draw_line(cx, 0, cx, h - 1, 0x181424);\n host::display::draw_line(0, cy, w - 1, cy, 0x181424);\n host::display::present();\n}\n",
"tags": [
"generative",
"symmetry",
"pointer",
"state"
]
}