1 files changed, 35 insertions, 0 deletions
diff --git a/system/ZoneMinder/fix_zone_area_calc.patch b/system/ZoneMinder/fix_zone_area_calc.patch
new file mode 100644
index 0000000000..d55488071d
--- /dev/null
+++ b/system/ZoneMinder/fix_zone_area_calc.patch
@@ -0,0 +1,35 @@
+--- web/skins/classic/views/js/zone.js 2019-01-23 00:24:26.094085919 -0500
++++ web/skins/classic/views/js/zone.js.new 2019-01-23 00:25:13.871710907 -0500
+@@ -347,6 +347,7 @@
+   zone['Points'][index].x = x;
+   var Point = $('zonePoly').points.getItem(index);
+   Point.x = x;
++  updateArea();
+ }
+
+ function updateY( index ) {
+@@ -359,6 +360,7 @@
+   zone['Points'][index].y = y;
+   var Point = $('zonePoly').points.getItem(index);
+   Point.y = y;
++  updateArea();
+ }
+
+ function saveChanges( element ) {
+@@ -697,11 +699,12 @@
+   var n_coords = coords.length;
+   var float_area = 0.0;
+
+-  for ( i = 0, j = n_coords-1; i < n_coords; j = i++ ) {
+-    var trap_area = ( ( coords[i].x - coords[j].x ) * ( coords[i].y + coords[j].y ) ) / 2;
+-    float_area += trap_area;
+-    //printf( "%.2f (%.2f)\n", float_area, trap_area );
++  for ( i = 0; i < n_coords-1; i++ ) {
++      var trap_area = (coords[i].x*coords[i+1].y - coords[i+1].x*coords[i].y) / 2;
++      float_area += trap_area;
+   }
++  float_area += (coords[n_coords-1].x*coords[0].y - coords[0].x*coords[n_coords-1].y) / 2;
++
+   return Math.round( Math.abs( float_area ) );
+ }
+