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@@ -1,12 +1,14 @@
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#!/usr/bin/env python3
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"""
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draw_12_rects_and_send.py
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draw_12_rects_thick_outline.py
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* 800 × 600 framebuffer, 32‑bit ARGB (A,R,G,B each 1 byte)
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* 12 rectangles, aspect ratio width : height = 1 : 12 (tall, upright)
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* rectangles are placed side‑by‑side, centred in the image
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* the complete framebuffer is sent over a TCP connection to
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a server listening on localhost:12345
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800 × 600 ARGB framebuffer.
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12 tall rectangles (aspect 1 : 12) placed side‑by‑side with a gap.
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Only the rectangle outline is drawn, the border thickness can be changed
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with the constant LINE_THICKNESS (default = 3 pixels).
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The complete framebuffer is streamed to a TCP server listening on
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localhost:12345 (payload is prefixed with a 4‑byte big‑endian length).
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"""
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import socket
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@@ -22,54 +24,79 @@ BPP = 4 # bytes per pixel (A,R,G,B)
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# ----------------------------------------------------------------------
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# Geometry of the 12 rectangles
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# ----------------------------------------------------------------------
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# Height of a rectangle must fill the whole image (600 px)
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# width = height / 12 → 600 / 12 = 50 px
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RECT_HEIGHT = FB_HEIGHT // 2
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RECT_WIDTH = RECT_HEIGHT // 12 # 50
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SPACING = 20
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RECT_HEIGHT = 400 # fill the whole image vertically
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RECT_WIDTH = RECT_HEIGHT // 12 # 600 / 12 = 50 px (maintains 1:12)
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TOTAL_RECT_W = (11 * SPACING) + (RECT_WIDTH * 12) # 600
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X0_START = (FB_WIDTH - TOTAL_RECT_W) // 2 # centre the strip
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SPACING = 10 # pixels between two neighbours
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TOTAL_RECT_W = 12 * RECT_WIDTH + 11 * SPACING
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X0_START = (FB_WIDTH - TOTAL_RECT_W) // 2 # centre the whole strip
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# ----------------------------------------------------------------------
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# Outline thickness (change this to whatever you need)
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# ----------------------------------------------------------------------
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LINE_THICKNESS = 4 # >=1 ; thicker than 1 pixel
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# ----------------------------------------------------------------------
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# Helper – write a pixel into the bytearray (no bounds check for speed)
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# ----------------------------------------------------------------------
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def set_pixel(buf: bytearray, x: int, y: int, color: tuple):
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"""Write an ARGB pixel at (x,y).
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`color` is a 4‑tuple (A,R,G,B) with each component 0‑255.
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"""
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def set_pixel(buf: bytearray, x: int, y: int, color: tuple) -> None:
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"""Write an ARGB pixel at (x, y). `color` = (A,R,G,B)."""
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offset = (y * FB_WIDTH + x) * BPP
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buf[offset:offset+4] = bytes(color) # A,R,G,B order
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buf[offset:offset + 4] = bytes(color) # A,R,G,B order
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# ----------------------------------------------------------------------
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# Fill a rectangular region (used for thick edges)
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# ----------------------------------------------------------------------
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def fill_rect(buf: bytearray, x0: int, y0: int, w: int, h: int, color: tuple) -> None:
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"""Write a solid w × h block of `color` starting at (x0, y0)."""
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# Clip to the frame buffer – safety net for very thick lines at the border
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x0 = max(0, x0)
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y0 = max(0, y0)
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w = min(w, FB_WIDTH - x0)
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h = min(h, FB_HEIGHT - y0)
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row_bytes = w * BPP
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pixel_bytes = bytes(color)
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for y in range(y0, y0 + h):
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off = (y * FB_WIDTH + x0) * BPP
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buf[off:off + row_bytes] = pixel_bytes * w
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# ----------------------------------------------------------------------
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# Build the framebuffer
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# ----------------------------------------------------------------------
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def build_framebuffer() -> bytearray:
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"""Create an ARGB buffer, fill it black and draw the 12 rectangles."""
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"""Create an ARGB buffer, fill it black and draw the thick‑outline rectangles."""
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# 1️⃣ background = opaque black (A,R,G,B)
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fb = bytearray(FB_WIDTH * FB_HEIGHT * BPP)
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# ------------------------------------------------------------------
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# 1) background = solid black, fully opaque
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# ------------------------------------------------------------------
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bg_color = (255, 0, 0, 0) # A,R,G,B
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# Fill the whole buffer in one go (faster than per‑pixel loop)
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bg_color = (255, 0, 0, 0) # opaque black
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fb[:] = bg_color * (FB_WIDTH * FB_HEIGHT)
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# ------------------------------------------------------------------
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# 2) draw the 12 rectangles
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# ------------------------------------------------------------------
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# 2️⃣ draw each rectangle outline
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for idx in range(12):
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rect_color = (255, 255, 255, 255) # opaque
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# ── colour palette (feel free to change) ───────────────────────
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rect_color = (255, 255, 255, 255) # opaque
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x_start = X0_START + idx * (RECT_WIDTH + SPACING)
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x_end = x_start + RECT_WIDTH # exclusive
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# left‑most X coordinate of the *inner* rectangle (the border belongs to it)
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x0 = X0_START + idx * (RECT_WIDTH + SPACING)
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y0 = 100
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w = RECT_WIDTH
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h = RECT_HEIGHT
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for y in range(FB_HEIGHT):
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# slice‑assignment is faster than per‑pixel calls
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row_offset = (y * FB_WIDTH + x_start) * BPP
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fb[row_offset:row_offset + RECT_WIDTH * BPP] = rect_color * RECT_WIDTH
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# ── thick edges ──────────────────────────────────────────────────
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# top edge
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fill_rect(fb, x0, y0, w, LINE_THICKNESS, rect_color)
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# bottom edge
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fill_rect(fb, x0, y0 + h - LINE_THICKNESS, w, LINE_THICKNESS, rect_color)
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# left edge
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fill_rect(fb, x0, y0, LINE_THICKNESS, h, rect_color)
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# right edge
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fill_rect(fb, x0 + w - LINE_THICKNESS, y0, LINE_THICKNESS, h, rect_color)
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return fb
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@@ -77,22 +104,24 @@ def build_framebuffer() -> bytearray:
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# ----------------------------------------------------------------------
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# Send the buffer to the TCP server
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# ----------------------------------------------------------------------
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def send_framebuffer(buf: bytearray, host: str = "127.0.0.1", port: int = 12345):
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def send_framebuffer(buf: bytearray,
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host: str = "127.0.0.1",
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port: int = 12345) -> None:
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"""Open a TCP socket, connect, and stream the whole framebuffer."""
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try:
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with socket.create_connection((host, port), timeout=5) as sock:
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# Optional: prefix the payload with its length (big‑endian uint32)
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# optional length prefix (many protocols expect it)
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length_prefix = len(buf).to_bytes(4, byteorder="big")
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sock.sendall(length_prefix + buf)
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print(f"Sent {len(buf)} bytes to {host}:{port}")
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print(f"✔ Sent {len(buf)} bytes to {host}:{port}")
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except Exception as exc:
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print(f"Could not send framebuffer: {exc}", file=sys.stderr)
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print(f"❌ Could not send framebuffer: {exc}", file=sys.stderr)
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# ----------------------------------------------------------------------
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# Main entry point
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# ----------------------------------------------------------------------
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def main():
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def main() -> None:
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fb = build_framebuffer()
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send_framebuffer(fb)
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