From 627c4b5584523ad1a3f2a733af594209245a257f Mon Sep 17 00:00:00 2001
From: Davide Passoni <d.passed@libero.it>
Date: Fri, 31 Jan 2025 17:25:14 +0100
Subject: [PATCH] feat: started working at measuring tool

---
 frontend/react/src/constants/constants.ts     |  3 +-
 frontend/react/src/map/map.ts                 | 53 ++++++++++-
 .../react/src/map/markers/measuremarker.ts    | 90 +++++++++++++++++++
 .../src/map/markers/stylesheets/measure.css   | 26 ++++++
 4 files changed, 168 insertions(+), 4 deletions(-)
 create mode 100644 frontend/react/src/map/markers/measuremarker.ts
 create mode 100644 frontend/react/src/map/markers/stylesheets/measure.css

diff --git a/frontend/react/src/constants/constants.ts b/frontend/react/src/constants/constants.ts
index 8a818a7e..2b55b5e5 100644
--- a/frontend/react/src/constants/constants.ts
+++ b/frontend/react/src/constants/constants.ts
@@ -325,7 +325,8 @@ export enum OlympusState {
   GAME_MASTER = "Game master",
   IMPORT_EXPORT = "Import/export",
   WARNING = "Warning modal",
-  DATABASE_EDITOR = "Database editor"
+  DATABASE_EDITOR = "Database editor",
+  MEASURE = "Measure"
 }
 
 export const NO_SUBSTATE = "No substate";
diff --git a/frontend/react/src/map/map.ts b/frontend/react/src/map/map.ts
index c83a82f5..2537db1b 100644
--- a/frontend/react/src/map/map.ts
+++ b/frontend/react/src/map/map.ts
@@ -3,7 +3,7 @@ import { getApp } from "../olympusapp";
 import { BoxSelect } from "./boxselect";
 import { Airbase } from "../mission/airbase";
 import { Unit } from "../unit/unit";
-import { areaContains, deepCopyTable, deg2rad, getGroundElevation } from "../other/utils";
+import { areaContains, bearing, bearingAndDistanceToLatLng, deepCopyTable, deg2rad, getGroundElevation, mToFt, mToNm, nmToM, rad2deg } from "../other/utils";
 import { TemporaryUnitMarker } from "./markers/temporaryunitmarker";
 import { ClickableMiniMap } from "./clickableminimap";
 import {
@@ -36,6 +36,7 @@ import "./markers/stylesheets/airbase.css";
 import "./markers/stylesheets/bullseye.css";
 import "./markers/stylesheets/units.css";
 import "./markers/stylesheets/spot.css";
+import "./markers/stylesheets/measure.css";
 import "./stylesheets/map.css";
 
 import { initDraggablePath } from "./coalitionarea/draggablepath";
@@ -65,11 +66,12 @@ import {
 } from "../events";
 import { ContextActionSet } from "../unit/contextactionset";
 import { SmokeMarker } from "./markers/smokemarker";
+import { MeasureMarker } from "./markers/measuremarker";
 
 /* Register the handler for the box selection */
 L.Map.addInitHook("addHandler", "boxSelect", BoxSelect);
 
-initDraggablePath(L); 
+initDraggablePath(L);
 
 export class Map extends L.Map {
   /* Options */
@@ -154,6 +156,11 @@ export class Map extends L.Map {
   #targetPoint: TargetMarker | null = null;
   #IPToTargetLine: L.Polygon | null = null;
 
+  /* Measure tool */
+  #measureReference: L.LatLng | null = null;
+  #measureLines: L.Polyline[] = [];
+  #measureMarkers: MeasureMarker[] = [];
+
   /**
    *
    * @param ID - the ID of the HTML element which will contain the map
@@ -322,6 +329,16 @@ export class Map extends L.Map {
 
     getApp()
       .getShortcutManager()
+      .addShortcut("measure", {
+        label: "Toggle measurement tool",
+        keyUpCallback: () => {
+          getApp().getState() === OlympusState.MEASURE ? getApp().setState(OlympusState.IDLE) : getApp().setState(OlympusState.MEASURE);
+        },
+        code: "KeyM",
+        shiftKey: false,
+        altKey: false,
+        ctrlKey: false,
+      })
       .addShortcut("toggleUnitLabels", {
         label: "Hide/show labels",
         keyUpCallback: () => this.setOption("showUnitLabels", !this.getOptions().showUnitLabels),
@@ -837,7 +854,7 @@ export class Map extends L.Map {
     this.getContainer().classList.remove(`explosion-cursor`);
     ["white", "blue", "red", "green", "orange"].forEach((color) => this.getContainer().classList.remove(`smoke-${color}-cursor`));
     this.getContainer().classList.remove(`plus-cursor`);
-
+    
     /* Operations to perform when entering a state */
     if (state === OlympusState.IDLE) {
       getApp().getUnitsManager()?.deselectAllUnits();
@@ -904,6 +921,15 @@ export class Map extends L.Map {
     if (e.originalEvent?.button === 0) {
       this.#isLeftMouseDown = true;
       this.#leftMouseDownEpoch = Date.now();
+
+      /* If we are in the measure state there can only be a short click so immediately perform the action */
+      if (getApp().getState() === OlympusState.MEASURE) {
+        if (this.#measureLines.length > 0 && this.#measureReference)
+          this.#measureLines[this.#measureLines.length - 1].setLatLngs([this.#measureReference, e.latlng]);
+        this.#measureReference = e.latlng;
+        this.#measureLines.push(new L.Polyline([this.#measureReference, e.latlng], { color: "magenta" }).addTo(this));
+        this.#measureMarkers.push(new MeasureMarker(e.latlng, "", 0).addTo(this));
+      }
     } else if (e.originalEvent?.button === 2) {
       this.#isRightMouseDown = true;
       this.#rightMouseDownEpoch = Date.now();
@@ -1033,6 +1059,8 @@ export class Map extends L.Map {
             if (this.#contextAction !== null) this.executeContextAction(null, e.latlng, e.originalEvent);
             else if (getApp().getSubState() === NO_SUBSTATE) getApp().setState(OlympusState.IDLE);
             else getApp().setState(OlympusState.UNIT_CONTROL);
+          } else if (getApp().getState() === OlympusState.MEASURE) {
+            /* Do nothing, we already clicked on the mouse down callback */
           } else {
             if (getApp().getSubState() === NO_SUBSTATE) getApp().setState(OlympusState.IDLE);
             else getApp().setState(OlympusState.UNIT_CONTROL);
@@ -1099,6 +1127,20 @@ export class Map extends L.Map {
       if (getApp().getState() === OlympusState.SPAWN) {
         if (this.#currentSpawnMarker) this.#currentSpawnMarker.setLatLng(e.latlng);
         if (this.#currentEffectMarker) this.#currentEffectMarker.setLatLng(e.latlng);
+      } else if (getApp().getState() === OlympusState.MEASURE) {
+        if (this.#measureLines.length > 0) this.#measureLines[this.#measureLines.length - 1].setLatLngs([this.#measureReference, e.latlng]);
+        if (this.#measureMarkers.length > 0 && this.#measureReference) {
+          const distance = this.#measureReference.distanceTo(e.latlng);
+          let distanceString = ""
+          if (distance > nmToM(1)) distanceString = `${mToNm(distance).toFixed(2)} NM`;
+          else distanceString = `${mToFt(distance).toFixed(2)} ft`;
+          const bearingTo = deg2rad(bearing(this.#measureReference.lat, this.#measureReference.lng, e.latlng.lat, e.latlng.lng, false));
+          const halfPoint = bearingAndDistanceToLatLng(this.#measureReference.lat, this.#measureReference.lng, bearingTo, distance/2);
+          const bearingString = `${(Math.floor(rad2deg(bearingTo) + 360) % 360)}°`;
+          this.#measureMarkers[this.#measureMarkers.length - 1].setLatLng(halfPoint);
+          this.#measureMarkers[this.#measureMarkers.length - 1].setRotationAngle(bearingTo + Math.PI / 2);
+          this.#measureMarkers[this.#measureMarkers.length - 1].setTextValue(`${distanceString} - ${bearingString}`);
+        }
       }
     } else {
       this.#destionationWasRotated = true;
@@ -1166,6 +1208,11 @@ export class Map extends L.Map {
     });
   }
 
+  #clearMeasures() {
+    this.#measureLines.forEach((line) => line.removeFrom(this));
+    this.#measureMarkers.forEach((marker) => marker.removeFrom(this));
+  }
+
   /* */
   #panToUnit(unit: Unit) {
     var unitPosition = new L.LatLng(unit.getPosition().lat, unit.getPosition().lng);
diff --git a/frontend/react/src/map/markers/measuremarker.ts b/frontend/react/src/map/markers/measuremarker.ts
new file mode 100644
index 00000000..1cf34e90
--- /dev/null
+++ b/frontend/react/src/map/markers/measuremarker.ts
@@ -0,0 +1,90 @@
+import { Marker, LatLng, DivIcon, Map } from "leaflet";
+
+export class MeasureMarker extends Marker {
+  #textValue: string;
+  #isEditable: boolean = false;
+  #rotationAngle: number; // Rotation angle in radians
+  #previousValue: string;
+
+  onValueUpdated: (value: number) => void = () => {};
+  onDeleteButtonClicked: () => void = () => {};
+
+  /**
+   * Constructor for SpotEditMarker
+   * @param {LatLng} latlng - The geographical position of the marker.
+   * @param {string} textValue - The initial text value to display.
+   * @param {number} rotationAngle - The initial rotation angle in radians.
+   */
+  constructor(latlng: LatLng, textValue: string, rotationAngle: number = 0) {
+    super(latlng, {
+      icon: new DivIcon({
+        className: "leaflet-measure-marker",
+        html: `<div class="container">
+        <div class="text">${textValue}</div>
+        </div>`,
+      }),
+    });
+
+    this.#textValue = textValue;
+    this.#rotationAngle = rotationAngle;
+  }
+
+  /**
+   * Sets the text value of the marker.
+   * @param {string} textValue - The new text value.
+   */
+  setTextValue(textValue: string) {
+    this.#textValue = textValue;
+    const element = this.getElement();
+    if (element) {
+      const text = element.querySelector(".text");
+      if (text) text.textContent = textValue;
+    }
+  }
+
+  /**
+   * Gets the text value of the marker.
+   * @returns {string} - The current text value.
+   */
+  getTextValue() {
+    return this.#textValue;
+  }
+
+  /**
+   * Sets the rotation angle of the marker in radians.
+   * @param {number} angle - The new rotation angle in radians.
+   */
+  setRotationAngle(angle: number) {
+    this.#rotationAngle = angle;
+    if (!this.#isEditable) {
+      this.#updateRotation();
+    }
+  }
+
+  /**
+   * Gets the rotation angle of the marker in radians.
+   * @returns {number} - The current rotation angle in radians.
+   */
+  getRotationAngle() {
+    return this.#rotationAngle;
+  }
+
+  /**
+   * Updates the rotation angle to ensure the text is always readable.
+   */
+  #updateRotation() {
+    const element = this.getElement();
+    if (element) {
+      const container = element.querySelector(".container") as HTMLDivElement;
+      if (container) {
+        let angle = this.#rotationAngle % (2 * Math.PI);
+        if (angle < 0) angle += 2 * Math.PI;
+        if (angle > Math.PI / 2 && angle < (3 * Math.PI) / 2) {
+          angle = (angle + Math.PI) % (2 * Math.PI); // Flip the text to be upright
+        }
+        const angleInDegrees = angle * (180 / Math.PI);
+        container.style.transform = `rotate(${angleInDegrees}deg)`;
+      }
+    }
+  }
+}
diff --git a/frontend/react/src/map/markers/stylesheets/measure.css b/frontend/react/src/map/markers/stylesheets/measure.css
new file mode 100644
index 00000000..412aa50e
--- /dev/null
+++ b/frontend/react/src/map/markers/stylesheets/measure.css
@@ -0,0 +1,26 @@
+/* Container for the measure marker */
+.leaflet-measure-marker {
+  text-align: center;
+  display: flex !important;
+  justify-content: center;
+  align-items: center;
+}
+
+/* Container for the measure marker content */
+.leaflet-measure-marker .container {
+  min-width: 150px;
+  transform-origin: center;
+  background-color: var(--background-steel);
+  color: white;
+  border-radius: 999px;
+  font-size: 13px;
+  align-content: center;
+  border: 2px solid transparent;
+}
+
+/* Text inside the measure marker */
+.leaflet-measure-marker .text {
+  margin-left: 12px;
+  margin-top: auto;
+  margin-bottom: auto;
+}