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Render devices in preview image

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yellowcooln 2026-01-13 15:52:28 +00:00
parent 896ee149da
commit bc58dff73f
1 changed files with 40 additions and 2 deletions
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42
backend/app.py
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@ -6,7 +6,7 @@ import time
import subprocess
from datetime import datetime, timezone
from dataclasses import asdict
from typing import Any, Dict, Optional, Set, List
from typing import Any, Dict, Optional, Set, List, Tuple
import httpx
import paho.mqtt.client as mqtt
@ -1366,6 +1366,45 @@ async def preview_image(
print(f"[preview] Fetched {tiles_fetched} tiles, {tiles_failed} failed")
# Draw current devices (all in-bounds, no cap)
def latlon_to_global_px(lat_deg: float, lon_deg: float, zoom_level: int) -> Tuple[float, float]:
lat_rad = math.radians(lat_deg)
n = 2.0 ** zoom_level
x_px = (lon_deg + 180.0) / 360.0 * n * tile_size
y_px = (1.0 - math.asinh(math.tan(lat_rad)) / math.pi) / 2.0 * n * tile_size
return (x_px, y_px)
draw = ImageDraw.Draw(final_image)
center_px_x, center_px_y = latlon_to_global_px(lat, lon, zoom_val)
node_radius = 5
node_color = (86, 198, 255) if theme_str == "dark" else (25, 83, 170)
node_outline = (15, 15, 15) if theme_str == "dark" else (255, 255, 255)
for state in list(devices.values()):
try:
dev_lat = float(state.lat)
dev_lon = float(state.lon)
except Exception:
continue
if _coords_are_zero(dev_lat, dev_lon) or not _within_map_radius(dev_lat, dev_lon):
continue
dev_px_x, dev_px_y = latlon_to_global_px(dev_lat, dev_lon, zoom_val)
img_x = width / 2 + (dev_px_x - center_px_x)
img_y = height / 2 + (dev_px_y - center_px_y)
if (
img_x < -node_radius
or img_x > width + node_radius
or img_y < -node_radius
or img_y > height + node_radius
):
continue
draw.ellipse(
[(img_x - node_radius, img_y - node_radius),
(img_x + node_radius, img_y + node_radius)],
fill=node_color,
outline=node_outline,
width=2
)
# Draw marker
marker_color_map = {
'red': (220, 53, 69),
@ -1383,7 +1422,6 @@ async def preview_image(
marker_x = width // 2
marker_y = height // 2
draw = ImageDraw.Draw(final_image)
# Draw a circle marker
marker_radius = 12
draw.ellipse(