Material utilisation

closes #98, #33, 31

Author: Dexus

main/background.js

@@ -1745,8 +1745,10 @@ function placeParts(sheets, parts, config, nestindex) {
 
 	console.log('WATCH', allplacements);
 
+	const utilisation = totalsheetarea > 0 ? (area / totalsheetarea) * 100 : 0;
+	console.log(`Utilisation of the sheet(s): ${utilisation.toFixed(2)}%`);
 
-    return { placements: allplacements, fitness: fitness, area: sheetarea,totalarea: totalsheetarea, mergedLength: totalMerged };
+    return { placements: allplacements, fitness: fitness, area: sheetarea,totalarea: totalsheetarea, mergedLength: totalMerged, utilisation: utilisation};
 }
 
 // New helper function to analyze sheet holes

main/index.html

@@ -63,6 +63,7 @@
 			<div id="nestinfo" class='{{ nests.length > 0 ? "active" : "" }}'>
 				<div class="group"><h1>{{ getSelected().length > 0 ? getSelected()[0].placements.length : '-' }}</h1><span class="label">{{ getSelected().length > 0 ? (getSelected()[0].placements.length > 1 ? 'sheets used' : 'sheet used') : '' }}</span></div>
 				<div class="group"><h1>{{ getPartsPlaced() }}</h1><span class="label">parts placed</span></div>
+				<div class="group"><h1>{{ getUtilisation() }}%</h1><span class="label">sheet utilisation</span></div>
 				<div class="group"><h1>{{ getTimeSaved() }}</h1><span class="label">laser time saved</span></div>
 				<div class="group"><h1>best nests so far</h1></div>
 				<div id="nestlist">

main/page.js

@@ -1660,6 +1660,11 @@ ready(async function () {
 
                 return num + '/' + total;
             },
+            getUtilisation: function () {
+                const selected = this.get('getSelected')(); // reuse getSelected()
+                if (selected.length === 0) return '-';
+                return selected[0].utilisation.toFixed(2); // Formata para 2 decimais
+            },
             getTimeSaved: function () {
                 var ne = this.get('nests');
                 var selected = ne.filter(function (n) {