add growBy and constructors from NRRect(L)

(bzr r2699)

1 files changed, 20 insertions, 0 deletions

diff --git a/src/libnr/nr-rect.cpp b/src/libnr/nr-rect.cpp
index f3eb498af..d34c548ad 100644
--- a/src/libnr/nr-rect.cpp
+++ b/src/libnr/nr-rect.cpp
@@ -247,6 +247,16 @@ Rect::Rect(const Point &p0, const Point &p1)
   _max(std::max(p0[X], p1[X]), std::max(p0[Y], p1[Y]))
 {}
 
+Rect::Rect(NRRect *r)
+    : _min(r->x0, r->y0),
+      _max(r->x1, r->y1)
+{}
+
+Rect::Rect(NRRectL *r)
+    : _min(r->x0, r->y0),
+      _max(r->x1, r->y1)
+{}
+
 /** returns the four corners of the rectangle in the correct winding order */
 Point Rect::corner(unsigned i) const {
 	switch (i % 4) {
@@ -285,6 +295,16 @@ void Rect::expandTo(Point p) {
 	}
 }
 
+void Rect::growBy(double size) {
+  for ( unsigned d = 0 ; d < 2 ; d++ ) {
+    _min[d] -= size;
+    _max[d] += size;
+    if ( _min[d] > _max[d] ) {
+      _min[d] = _max[d] = ( _min[d] + _max[d] ) / 2;
+    }
+  }
+} 
+
 /** Returns the set of points shared by both rectangles. */
 Maybe<Rect> intersection(Maybe<Rect> const & a, Maybe<Rect> const & b) {
     if ( !a || !b ) {