Add convenience methods to increase and decrease widths of rectangle in chain

Author: Snipx

kernel/src/main/java/com/itextpdf/kernel/geom/Rectangle.java

@@ -58,9 +58,9 @@ This file is part of the iText (R) project.
  */
 public class Rectangle implements Cloneable, Serializable {
 
-    private static final long serialVersionUID = 8025677415569233446L;
+    static float EPS = 1e-4f;
 
-    private static float EPS = 1e-4f;
+    private static final long serialVersionUID = 8025677415569233446L;
 
     protected float x;
     protected float y;
@@ -415,6 +415,28 @@ public Rectangle decreaseHeight(float extra) {
         return this;
     }
 
+    /**
+     * Increases the width of rectangle by the given value. May be used in chain.
+     *
+     * @param extra the value of the extra wudth to be added.
+     * @return this {@link Rectangle} instance.
+     */
+    public Rectangle increaseWidth(float extra) {
+        this.width += extra;
+        return this;
+    }
+
+    /**
+     * Decreases the width of rectangle by the given value. May be used in chain.
+     *
+     * @param extra the value of the extra width to be subtracted.
+     * @return this {@link Rectangle} instance.
+     */
+    public Rectangle decreaseWidth(float extra) {
+        this.width -= extra;
+        return this;
+    }
+
     /**
      * Gets the X coordinate of the left edge of the rectangle. Same as: {@code getX()}.
      *

kernel/src/test/java/com/itextpdf/kernel/geom/RectangleTest.java

@@ -49,14 +49,14 @@ This file is part of the iText (R) project.
 import com.itextpdf.kernel.pdf.PdfWriter;
 import com.itextpdf.test.ExtendedITextTest;
 import com.itextpdf.test.annotations.type.UnitTest;
-import org.junit.Assert;
-import org.junit.Test;
-import org.junit.experimental.categories.Category;
 
 import java.io.ByteArrayOutputStream;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
+import org.junit.Assert;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
 
 @Category(UnitTest.class)
 public class RectangleTest extends ExtendedITextTest {
@@ -644,4 +644,18 @@ public void cloneTest() {
         Assert.assertEquals(PageSize.class, copyAsPageSize.getClass());
         Assert.assertEquals(PageSize.class, copyAsRectangle.getClass());
     }
+
+    @Test
+    public void decreaseWidthTest() {
+        Rectangle rectangle = new Rectangle(100, 200);
+        rectangle.decreaseWidth(10);
+        Assert.assertEquals(90, rectangle.getWidth(), Rectangle.EPS);
+    }
+    
+    @Test
+    public void increaseWidthTest() {
+        Rectangle rectangle = new Rectangle(100, 200);
+        rectangle.increaseWidth(10);
+        Assert.assertEquals(110, rectangle.getWidth(), Rectangle.EPS);
+    }
 }