PowerStatus: show when the battery is charging.

src/apps/powerstatus/PowerStatusView.cpp

@@ -11,6 +11,7 @@
 
 #include "PowerStatusView.h"
 
+#include <algorithm>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -222,6 +223,26 @@ PowerStatusView::_DrawBattery(BRect rect)
 		}
 	}
 
+	if (fOnline) {
+		// When charging, draw a lightning symbol over the battery.
+		SetHighColor(255, 255, 0, 180);
+		SetDrawingMode(B_OP_ALPHA);
+		SetScale(std::min(Bounds().Width(), Bounds().Height()) / 16);
+
+		static const BPoint points[] = {
+			BPoint(2,13),
+			BPoint(9,5),
+			BPoint(9,7),
+			BPoint(16,2),
+			BPoint(8,11),
+			BPoint(8,9)
+		};
+		FillPolygon(points,6);
+
+		SetScale(1);
+		SetDrawingMode(B_OP_OVER);
+	}
+
 	SetHighColor(0, 0, 0);
 }