Add methods to rectangle to get its corners as locations

osx/classes/location.cpp

@@ -129,6 +129,22 @@ location rectangle::centre() {
 	return location((left + right) / 2, (top + bottom) / 2);
 }
 
+location rectangle::topLeft() {
+	return location(left, top);
+}
+
+location rectangle::topRight() {
+	return location(right, top);
+}
+
+location rectangle::bottomLeft() {
+	return location(left, bottom);
+}
+
+location rectangle::bottomRight() {
+	return location(right, bottom);
+}
+
 void rectangle::offset(int h, int v) {
 	left += h; right += h;
 	top += v; bottom += v;

osx/classes/location.h

@@ -57,6 +57,10 @@ struct rectangle {
 	rectangle_size_delegate width();
 	rectangle_size_delegate height();
 	location centre();
+	location topLeft();
+	location topRight();
+	location bottomLeft();
+	location bottomRight();
 	bool contains(location p);
 	bool contains(int x, int y);
 	void offset(int h, int v);