Merged in feature/MAPG-6-calculate-and-show-score-after-the-guess (pull request #5)

Feature/MAPG-6 calculate and show score after the guess

public/static/css/mapguesser.css

@@ -75,7 +75,7 @@ button:disabled {
     transition-delay: 0s;
 }
 
-#guess #guessMap {
+#guess > #guessMap {
     height: 115px;
     width: 100%;
     transition-property: height;
@@ -84,7 +84,7 @@ button:disabled {
     border-radius: 3px;
 }
 
-#guess:hover #guessMap {
+#guess:hover > #guessMap {
     height: 315px;
     transition-delay: 0s;
 }
@@ -122,12 +122,33 @@ button:disabled {
 #resultInfo {
     height: 30%;
     width: 100%;
-    padding: 20px;
+    padding: 10px 20px;
     text-align: center;
     box-sizing: border-box;
 }
 
+#resultInfo > div {
+    height: 25%;
+    width: 100%;
+    display: flex;
+    justify-content: center;
+    align-items: center;
+}
+
 #resultInfo p {
-    margin-bottom: 20px;
     font-size: 24px;
 }
+
+#scoreBarBase {
+    height: 20px;
+    width: 60%;
+    margin: 0 auto;
+    background-color: #eeeeee;
+    border-radius: 3px;
+}
+
+#scoreBar {
+    height: 100%;
+    transition-property: width;
+    transition-duration: 1.0s;
+}

public/static/js/mapguesser.js

@@ -5,21 +5,22 @@ Math.deg2rad = function (deg) {
 var Util = {
     EARTH_RADIUS_IN_METER: 6371000,
 
+    MAX_SCORE: 1000,
+
     calculateDistance: function (position1, position2) {
         var lat1 = Math.deg2rad(position1.lat);
         var lng1 = Math.deg2rad(position1.lng);
         var lat2 = Math.deg2rad(position2.lat);
         var lng2 = Math.deg2rad(position2.lng);
 
-        var latDelta = lat2 - lat1;
-        var lonDelta = lng2 - lng1;
+        var angleCos = Math.cos(lat1) * Math.cos(lat2) * Math.cos(lng2 - lng1) +
+            Math.sin(lat1) * Math.sin(lat2);
 
-        var angle = 2 * Math.asin(
-            Math.sqrt(
-                Math.pow(Math.sin(latDelta / 2), 2) +
-                Math.cos(lat1) * Math.cos(lat2) * Math.pow(Math.sin(lonDelta / 2), 2)
-            )
-        );
+        if (angleCos > 1.0) {
+            angleCos = 1.0;
+        }
+
+        var angle = Math.acos(angleCos);
 
         return angle * Util.EARTH_RADIUS_IN_METER;
     },
@@ -34,6 +35,27 @@ var Util = {
         } else {
             return Number.parseFloat(distance / 1000).toFixed(0) + ' km';
         }
+    },
+
+    calculateScore: function (distance) {
+        var goodness = 1.0 - distance / Math.sqrt(mapArea);
+
+        return Math.pow(this.MAX_SCORE, goodness);
+    },
+
+    calculateScoreBarProperties: function (score) {
+        var percent = Math.round((score / this.MAX_SCORE) * 100);
+
+        var color;
+        if (percent >= 90) {
+            color = '#11ca00';
+        } else if (percent >= 10) {
+            color = '#ea9000';
+        } else {
+            color = '#ca1100';
+        }
+
+        return { width: percent + '%', backgroundColor: color };
     }
 };
 
@@ -190,9 +212,20 @@ document.getElementById('guessButton').onclick = function () {
     });
 
     document.getElementById('distance').innerHTML = Util.printDistanceForHuman(distance);
+
+    var score = Util.calculateScore(distance);
+    var scoreBarProperties = Util.calculateScoreBarProperties(score);
+
+    document.getElementById('score').innerHTML = Number.parseFloat(score).toFixed(0);
+
+    var scoreBar = document.getElementById('scoreBar');
+    scoreBar.style.backgroundColor = scoreBarProperties.backgroundColor;
+    scoreBar.style.width = scoreBarProperties.width;
 }
 
 document.getElementById('continueButton').onclick = function () {
+    document.getElementById('scoreBar').style.width = '0';
+
     resultMarkers.real.setMap(null);
     resultMarkers.real = null;
     resultMarkers.guess.setMap(null);

src/Util/Geo/Bounds.php

@@ -2,6 +2,8 @@
 
 class Bounds
 {
+    const ONE_DEGREE_OF_LATITUDE_IN_METER = 111132.954;
+
     private float $southLat;
     private float $westLng;
 
@@ -19,7 +21,7 @@ class Bounds
         return $instance;
     }
 
-    public static function createDirectly(float $southLat, $westLng, $northLat, $eastLng): Bounds
+    public static function createDirectly(float $southLat, float $westLng, float $northLat, float $eastLng): Bounds
     {
         $instance = new static();
 
@@ -61,6 +63,18 @@ class Bounds
         }
     }
 
+    public function calculateApproximateArea(): float
+    {
+        $dLat = $this->northLat - $this->southLat;
+        $dLng = $this->eastLng - $this->westLng;
+
+        $m = $dLat * static::ONE_DEGREE_OF_LATITUDE_IN_METER;
+        $a = $dLng * static::ONE_DEGREE_OF_LATITUDE_IN_METER * cos(deg2rad($this->northLat));
+        $c = $dLng * static::ONE_DEGREE_OF_LATITUDE_IN_METER * cos(deg2rad($this->southLat));
+
+        return $m * ($a + $c) / 2;
+    }
+
     public function toJson(): string
     {
         if (!$this->initialized) {

src/Util/Geo/Position.php

@@ -2,6 +2,8 @@
 
 class Position
 {
+    const EARTH_RADIUS_IN_METER = 6371000;
+
     private float $lat;
     private float $lng;
 
@@ -21,6 +23,24 @@ class Position
         return $this->lng;
     }
 
+    public function calculateDistanceTo(Position $otherPosition): float
+    {
+        $lat1 = deg2rad($this->lat);
+        $lng1 = deg2rad($this->lng);
+        $lat2 = deg2rad($otherPosition->lat);
+        $lng2 = deg2rad($otherPosition->lng);
+
+        $angleCos = cos($lat1) * cos($lat2) * cos($lng2 - $lng1) + sin($lat1) * sin($lat2);
+
+        if ($angleCos > 1.0) {
+            $angleCos = 1.0;
+        }
+
+        $angle = acos($angleCos);
+
+        return $angle * static::EARTH_RADIUS_IN_METER;
+    }
+
     public function toArray(): array
     {
         return [

views/game.php

@@ -17,11 +17,22 @@
     <div id="result">
         <div id="resultMap"></div>
         <div id="resultInfo">
+            <div>
                 <p>You were <span id="distance" class="bold"></span> close.</p>
+            </div>
+            <div>
+                <p>You earned <span id="score" class="bold"></span> points.</p>
+            </div>
+            <div>
+                <div id="scoreBarBase"><div id="scoreBar"></div></div>
+            </div>
+            <div>
                 <button id="continueButton">Continue</button>
             </div>
         </div>
+    </div>
     <script>
+        var mapArea = <?= $bounds->calculateApproximateArea() ?>;
         var guessMapBounds = <?= $bounds->toJson() ?>;
     </script>
     <script src="static/js/mapguesser.js" async defer></script>