corrected wrong constructors in src/util/Rectangle

src/util/Rectangle.cpp

@@ -8,23 +8,15 @@ Rectangle::Rectangle()
 }
 
 Rectangle::Rectangle(double x, double y, double width, double height)
+ : x(x), y(y), width(width), height(height)
 {
 	XOJ_INIT_TYPE(Rectangle);
-
-	this->x = x;
-	this->y = y;
-	this->width = width;
-	this->height = height;
 }
 
-Rectangle::Rectangle(Range& rect)
+Rectangle::Rectangle(const Range& rect)
+ : x(rect.getX()), y(rect.getY()), width(rect.getWidth()), height(rect.getHeight())
 {
 	XOJ_INIT_TYPE(Rectangle);
-
-	this->x = rect.getX();
-	this->y = rect.getY();
-	this->width = rect.getWidth();
-	this->height = rect.getHeight();
 }
 
 Rectangle::~Rectangle()

src/util/Rectangle.h

@@ -19,7 +19,7 @@ class Rectangle
 {
 public:
 	Rectangle();
-	Rectangle(Range& rect);
+	explicit Rectangle(const Range& rect);
 	Rectangle(double x, double y, double width, double height);
 	virtual ~Rectangle();