Rectangle moving operators

Author: Zverik

src/core/geometry/qgsrectangle.cpp

@@ -222,6 +222,42 @@ void QgsRectangle::combineExtentWith( double x, double y )
   }
 }
 
+QgsRectangle QgsRectangle::operator-( const QgsVector v ) const
+{
+  double xmin = mXmin - v.x();
+  double xmax = mXmax - v.x();
+  double ymin = mYmin - v.y();
+  double ymax = mYmax - v.y();
+  return QgsRectangle( xmin, ymin, xmax, ymax );
+}
+
+QgsRectangle QgsRectangle::operator+( const QgsVector v ) const
+{
+  double xmin = mXmin + v.x();
+  double xmax = mXmax + v.x();
+  double ymin = mYmin + v.y();
+  double ymax = mYmax + v.y();
+  return QgsRectangle( xmin, ymin, xmax, ymax );
+}
+
+QgsRectangle &QgsRectangle::operator-=( const QgsVector v )
+{
+  mXmin -= v.x();
+  mXmax -= v.x();
+  mYmin -= v.y();
+  mYmax -= v.y();
+  return *this;
+}
+
+QgsRectangle &QgsRectangle::operator+=( const QgsVector v )
+{
+  mXmin += v.x();
+  mXmax += v.x();
+  mYmin += v.y();
+  mYmax += v.y();
+  return *this;
+}
+
 bool QgsRectangle::isEmpty() const
 {
   return mXmax <= mXmin || mYmax <= mYmin;

src/core/geometry/qgsrectangle.h

@@ -201,6 +201,30 @@ class CORE_EXPORT QgsRectangle
      */
     void combineExtentWith( double x, double y );
 
+    /**
+     * Returns a rectangle offset from this one in the direction of the reversed vector.
+     * \since QGIS 3.0
+     */
+    QgsRectangle operator-( const QgsVector v ) const;
+
+    /**
+     * Returns a rectangle offset from this one in the direction of the vector.
+     * \since QGIS 3.0
+     */
+    QgsRectangle operator+( const QgsVector v ) const;
+
+    /**
+     * Moves this rectangle in the direction of the reversed vector.
+     * \since QGIS 3.0
+     */
+    QgsRectangle &operator-=( const QgsVector v );
+
+    /**
+     * Moves this rectangle in the direction of the vector.
+     * \since QGIS 3.0
+     */
+    QgsRectangle &operator+=( const QgsVector v );
+
     /**
      * Returns true if the rectangle is empty.
      * An empty rectangle may still be non-null if it contains valid information (e.g. bounding box of a point).

tests/src/core/testqgsrectangle.cpp

@@ -26,6 +26,7 @@ class TestQgsRectangle: public QObject
   private slots:
     void manipulate();
     void regression6194();
+    void operators();
 };
 
 void TestQgsRectangle::manipulate()
@@ -85,9 +86,30 @@ void TestQgsRectangle::regression6194()
   QVERIFY( rect1 == rect2 );
 }
 
-QGSTEST_MAIN( TestQgsRectangle )
-#include "testqgsrectangle.moc"
+void TestQgsRectangle::operators()
+{
+  QgsRectangle rect1 = QgsRectangle( 10.0, 20.0, 110.0, 220.0 );
+  QgsVector v = QgsVector( 1.0, 2.0 );
+  QgsRectangle rect2 = rect1 + v;
+  QVERIFY( rect1 != rect2 );
+  QCOMPARE( rect2.height(), rect1.height() );
+  QCOMPARE( rect2.width(), rect1.width() );
+  QCOMPARE( rect2.xMinimum(), 11.0 );
+  QCOMPARE( rect2.yMinimum(), 22.0 );
 
+  rect2 -= rect2.center() - rect1.center();
+  QVERIFY( rect1 == rect2 );
 
+  rect2 += v * 2.5;
+  QCOMPARE( rect2.xMinimum(), 12.5 );
+  QCOMPARE( rect2.yMinimum(), 25.0 );
 
+  rect2 = rect1 - v;
+  QCOMPARE( rect2.xMinimum(), 9.0 );
+  QCOMPARE( rect2.yMinimum(), 18.0 );
+  QCOMPARE( rect2.height(), rect1.height() );
+  QCOMPARE( rect2.width(), rect1.width() );
+}
 
+QGSTEST_MAIN( TestQgsRectangle )
+#include "testqgsrectangle.moc"