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torlando-tech
cff41d4fa0
- LVGL PNG decoder (lodepng) + SD card filesystem driver for loading OSM tiles - MapScreen with 2x2 tile grid, GPS marker, peer location markers, pan/zoom - 5th nav button (GPS icon) on conversation list for map access - TelemetryCodec: Sideband/Columba-compatible LXMF telemetry encode/decode - TelemetryManager: per-peer sharing sessions with duration/expiry, SPIFFS persistence - ChatScreen location share button with duration picker (15min/1hr/4hr/indefinite) - UIManager integration: telemetry send/receive via LXMF fields, map marker updates Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
83 lines
2.5 KiB
C++
83 lines
2.5 KiB
C++
// Copyright (c) 2024 microReticulum contributors
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// SPDX-License-Identifier: MIT
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#ifndef UI_LXMF_TILEMATH_H
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#define UI_LXMF_TILEMATH_H
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#include <cmath>
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#include <stdint.h>
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namespace UI {
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namespace LXMF {
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/**
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* Web Mercator tile coordinate math.
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* Standard OSM/Slippy map tile numbering (z/x/y).
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*/
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namespace TileMath {
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struct TileCoord {
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int tile_x;
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int tile_y;
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int pixel_x; // 0-255, pixel offset within tile
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int pixel_y;
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};
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/**
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* Convert lat/lon to tile coordinates at a given zoom level.
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* Returns the tile x/y and the pixel offset within that tile.
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*/
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inline TileCoord latlon_to_tile(double lat, double lon, int z) {
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double n = (double)(1 << z);
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double x = (lon + 180.0) / 360.0 * n;
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double lat_rad = lat * M_PI / 180.0;
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double y = (1.0 - log(tan(lat_rad) + 1.0 / cos(lat_rad)) / M_PI) / 2.0 * n;
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TileCoord tc;
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tc.tile_x = (int)floor(x);
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tc.tile_y = (int)floor(y);
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tc.pixel_x = (int)((x - tc.tile_x) * 256.0);
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tc.pixel_y = (int)((y - tc.tile_y) * 256.0);
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return tc;
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}
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/**
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* Convert tile coordinates (top-left corner) back to lat/lon.
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*/
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inline void tile_to_latlon(int tile_x, int tile_y, int z, double& lat, double& lon) {
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double n = (double)(1 << z);
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lon = (double)tile_x / n * 360.0 - 180.0;
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double lat_rad = atan(sinh(M_PI * (1.0 - 2.0 * (double)tile_y / n)));
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lat = lat_rad * 180.0 / M_PI;
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}
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/**
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* Convert a global pixel coordinate to lat/lon at a given zoom level.
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* Global pixel = tile * 256 + pixel_offset
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*/
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inline void pixel_to_latlon(double global_px, double global_py, int z,
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double& lat, double& lon) {
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double n = (double)(1 << z);
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lon = global_px / (n * 256.0) * 360.0 - 180.0;
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double lat_rad = atan(sinh(M_PI * (1.0 - 2.0 * global_py / (n * 256.0))));
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lat = lat_rad * 180.0 / M_PI;
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}
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/**
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* Convert lat/lon to global pixel coordinates at a given zoom level.
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*/
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inline void latlon_to_pixel(double lat, double lon, int z,
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double& px, double& py) {
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double n = (double)(1 << z);
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px = (lon + 180.0) / 360.0 * n * 256.0;
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double lat_rad = lat * M_PI / 180.0;
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py = (1.0 - log(tan(lat_rad) + 1.0 / cos(lat_rad)) / M_PI) / 2.0 * n * 256.0;
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}
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} // namespace TileMath
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} // namespace LXMF
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} // namespace UI
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#endif // UI_LXMF_TILEMATH_H
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