Add BoxF::ExpandTo

ui/gfx/box_f.cc

Index: ui/gfx/box_f.cc
diff --git a/ui/gfx/box_f.cc b/ui/gfx/box_f.cc
index efb579671457c9d78d3dbac1630207559ebd3d2a..6b6f2fd8fb906cd9d2f6233c82691094c64430e1 100644
--- a/ui/gfx/box_f.cc
+++ b/ui/gfx/box_f.cc
@@ -45,6 +45,29 @@ void BoxF::Union(const BoxF& box) {
   depth_ = max_z - min_z;
 }
 
+void BoxF::ExpandTo(const Point3F& point) {
+  Point3F max(
+      origin_.x() + width_, origin_.y() + height_, origin_.z() + depth_);
+
+  if (point.x() < origin_.x())
+    origin_.set_x(point.x());
+  if (point.y() < origin_.y())
+    origin_.set_y(point.y());
+  if (point.z() < origin_.z())
+    origin_.set_z(point.z());
+
+  if (point.x() > max.x())
+    max.set_x(point.x());
+  if (point.y() > max.y())
+    max.set_y(point.y());
+  if (point.z() > max.z())
+    max.set_z(point.z());
+
+  width_ = max.x() - origin_.x();
+  height_ = max.y() - origin_.y();
+  depth_ = max.z() - origin_.z();

[ajuma, 2013/10/01 13:21:02]

How about putting the logic that ExpandTo and Union have in common into a
separate helper function? I think we could share everything from Union except
the emptiness check.

+}
+
 BoxF UnionBoxes(const BoxF& a, const BoxF& b) {
   BoxF result = a;
   result.Union(b);