Node / meshtastic / Meshtastic-Android / files / feature / map / src / commonMain / kotlin / org / meshtastic / feature / map / kml / GroundOverlayCorners.kt

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T8b949e/*

* Copyright (c) 2026 Meshtastic LLC

*

* This program is free software: you can redistribute it and/or modify

* it under the terms of the GNU General Public License as published by

* the Free Software Foundation, either version 3 of the License, or

* (at your option) any later version.

*

* This program is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

* GNU General Public License for more details.

*

* You should have received a copy of the GNU General Public License

* along with this program. If not, see <https://www.gnu.org/licenses/>.

*/

Tff7b72package T7ee787org.meshtastic.feature.map.kml

Tff7b72import T7ee787kotlin.math.PI

Tff7b72import T7ee787kotlin.math.cos

Tff7b72import T7ee787kotlin.math.sin

Tff7b72private Tff7b72const Tff7b72val Te6edf3DEGREES_PER_HALF_TURN Tff7b72= T79c0ff1T79c0ff8T79c0ff0.0

T8b949e/** One corner of a draped image, longitude first as GeoJSON orders them. */

Tff7b72data Tff7b72class T56d364OverlayCornerTb4b4b4(Tff7b72val Te6edf3longitudeTb4b4b4: Tffa657DoubleTb4b4b4, Tff7b72val Te6edf3latitudeTb4b4b4: Tffa657DoubleTb4b4b4)

T8b949e/** The four corners of a ground overlay's image: top-left, top-right, bottom-right, bottom-left. */

Tff7b72data Tff7b72class T56d364OverlayCornersTb4b4b4(

Tff7b72val Te6edf3topLeftTb4b4b4: Te6edf3OverlayCornerTb4b4b4,

Tff7b72val Te6edf3topRightTb4b4b4: Te6edf3OverlayCornerTb4b4b4,

Tff7b72val Te6edf3bottomRightTb4b4b4: Te6edf3OverlayCornerTb4b4b4,

Tff7b72val Te6edf3bottomLeftTb4b4b4: Te6edf3OverlayCornerTb4b4b4,

Tb4b4b4)

T8b949e/**

* Where the overlay's image corners land, with the box's `<rotation>` applied.

*

* KML's rotation is degrees counter-clockwise about the box centre. The rotation happens in a locally-scaled frame —

* longitude offsets shrunk by cos(latitude) — so a rotated box keeps its shape on the ground instead of shearing with

* latitude. Exact enough for the tile-sized overlays this feature exists for; a continent-sized rotated overlay would

* drift, and nothing exports one.

*/

Tff7b72fun Te6edf3KmlGroundOverlayTb4b4b4.Td2a8ffcornersTb4b4b4(Tb4b4b4)Tb4b4b4: Te6edf3OverlayCorners Tb4b4b4{

Tff7b72val Te6edf3centerLon Tff7b72= Tb4b4b4(Te6edf3east Tff7b72+ Te6edf3westTb4b4b4) Tff7b72/ T79c0ff2

Tff7b72val Te6edf3centerLat Tff7b72= Tb4b4b4(Te6edf3north Tff7b72+ Te6edf3southTb4b4b4) Tff7b72/ T79c0ff2

Tff7b72if Tb4b4b4(Te6edf3rotationDegrees Tff7b72=Tff7b72= T79c0ff0.0Tb4b4b4) Tb4b4b4{

Tff7b72return Te6edf3OverlayCornersTb4b4b4(

Te6edf3topLeft Tff7b72= Te6edf3OverlayCornerTb4b4b4(Te6edf3westTb4b4b4, Te6edf3northTb4b4b4)Tb4b4b4,

Te6edf3topRight Tff7b72= Te6edf3OverlayCornerTb4b4b4(Te6edf3eastTb4b4b4, Te6edf3northTb4b4b4)Tb4b4b4,

Te6edf3bottomRight Tff7b72= Te6edf3OverlayCornerTb4b4b4(Te6edf3eastTb4b4b4, Te6edf3southTb4b4b4)Tb4b4b4,

Te6edf3bottomLeft Tff7b72= Te6edf3OverlayCornerTb4b4b4(Te6edf3westTb4b4b4, Te6edf3southTb4b4b4)Tb4b4b4,

Tb4b4b4)

Tb4b4b4}

Tff7b72val Te6edf3theta Tff7b72= Te6edf3rotationDegrees Tff7b72* Te6edf3PI Tff7b72/ Te6edf3DEGREES_PER_HALF_TURN

Tff7b72val Te6edf3cosTheta Tff7b72= Te6edf3cosTb4b4b4(Te6edf3thetaTb4b4b4)

Tff7b72val Te6edf3sinTheta Tff7b72= Te6edf3sinTb4b4b4(Te6edf3thetaTb4b4b4)

Tff7b72val Te6edf3latScale Tff7b72= Te6edf3cosTb4b4b4(Te6edf3centerLat Tff7b72* Te6edf3PI Tff7b72/ Te6edf3DEGREES_PER_HALF_TURNTb4b4b4)

Tff7b72fun Td2a8ffrotateTb4b4b4(Te6edf3lonTb4b4b4: Tffa657DoubleTb4b4b4, Te6edf3latTb4b4b4: Tffa657DoubleTb4b4b4)Tb4b4b4: Te6edf3OverlayCorner Tb4b4b4{

Tff7b72val Te6edf3x Tff7b72= Tb4b4b4(Te6edf3lon Tff7b72- Te6edf3centerLonTb4b4b4) Tff7b72* Te6edf3latScale

Tff7b72val Te6edf3y Tff7b72= Te6edf3lat Tff7b72- Te6edf3centerLat

Tff7b72val Te6edf3rotatedX Tff7b72= Te6edf3x Tff7b72* Te6edf3cosTheta Tff7b72- Te6edf3y Tff7b72* Te6edf3sinTheta

Tff7b72val Te6edf3rotatedY Tff7b72= Te6edf3x Tff7b72* Te6edf3sinTheta Tff7b72+ Te6edf3y Tff7b72* Te6edf3cosTheta

Tff7b72return Te6edf3OverlayCornerTb4b4b4(Te6edf3centerLon Tff7b72+ Te6edf3rotatedX Tff7b72/ Te6edf3latScaleTb4b4b4, Te6edf3centerLat Tff7b72+ Te6edf3rotatedYTb4b4b4)

Tb4b4b4}

Tff7b72return Te6edf3OverlayCornersTb4b4b4(

Te6edf3topLeft Tff7b72= Te6edf3rotateTb4b4b4(Te6edf3westTb4b4b4, Te6edf3northTb4b4b4)Tb4b4b4,

Te6edf3topRight Tff7b72= Te6edf3rotateTb4b4b4(Te6edf3eastTb4b4b4, Te6edf3northTb4b4b4)Tb4b4b4,

Te6edf3bottomRight Tff7b72= Te6edf3rotateTb4b4b4(Te6edf3eastTb4b4b4, Te6edf3southTb4b4b4)Tb4b4b4,

Te6edf3bottomLeft Tff7b72= Te6edf3rotateTb4b4b4(Te6edf3westTb4b4b4, Te6edf3southTb4b4b4)Tb4b4b4,

Tb4b4b4)

Tb4b4b4}