Migrating rotation utility from core to api

Author: RobFaustLZ

build.gradle

@@ -5,7 +5,7 @@ plugins {
 }
 
 group = 'com.labelzoom.api'
-version = '1.0.9'
+version = '1.0.10'
 
 repositories {
     mavenCentral()

src/main/java/com/labelzoom/api/util/RotationUtility.java

@@ -0,0 +1,148 @@
+package com.labelzoom.api.util;
+
+/* Copyright (C) 2021, LabelZoom, a subsidiary of RJF Technology Solutions, Inc.
+ * All rights reserved.  Proprietary and confidential.
+ *
+ * This file is subject to the license terms found at
+ * https://www.labelzoom.net/end-user-license-agreement/
+ *
+ * The methods and techniques described herein are considered
+ * confidential and/or trade secrets.
+ * No part of this file may be copied, modified, propagated,
+ * or distributed except as authorized by the license.
+ */
+
+import com.labelzoom.api.model.components.AComponent;
+import com.labelzoom.api.model.components.AFontComponent;
+import com.labelzoom.api.model.components.CLabel;
+import com.labelzoom.api.model.components.barcodes.linear.ALinearBarcode;
+
+import java.awt.geom.AffineTransform;
+import java.awt.image.AffineTransformOp;
+import java.awt.image.BufferedImage;
+
+public class RotationUtility
+{
+    public static int normalizeRotation(float degrees) { return normalizeRotation(Math.round(degrees)); }
+
+    public static int normalizeRotation(int degrees)
+    {
+        degrees = degrees % 360;
+        if (degrees < 0) degrees += 360;
+        return degrees;
+    }
+
+    public static void rotate(final CLabel label, final int degrees)
+    {
+        switch (degrees)
+        {
+            case -90:
+                rotateCounterClockwise(label);
+                return;
+            case 0:
+                return;
+            case 90:
+                rotateClockwise(label);
+                break;
+            case 180:
+                rotateClockwise(rotateClockwise(label));
+                break;
+            case 270:
+                rotateClockwise(rotateClockwise(rotateClockwise(label)));
+                break;
+        }
+    }
+
+    private static CLabel rotateClockwise(final CLabel label)
+    {
+        for (AComponent component : label.getElements())
+        {
+            final int newX = label.getWidth() - component.getTop();
+            final int newY = component.getLeft();
+            component.setLeft(newX);
+            component.setTop(newY);
+        }
+
+        // TODO: Do we really want to do this?
+        final int newWidth = label.getHeight();
+        final int newHeight = label.getWidth();
+        label.setWidth(newWidth);
+        label.setHeight(newHeight);
+
+        if (label.getOrientation() == CLabel.PageOrientation.Portrait)
+        {
+            label.setOrientation(CLabel.PageOrientation.Landscape);
+        }
+        else if (label.getOrientation() == CLabel.PageOrientation.Landscape)
+        {
+            label.setOrientation(CLabel.PageOrientation.ReversePortrait);
+        }
+        else if (label.getOrientation() == CLabel.PageOrientation.ReversePortrait)
+        {
+            label.setOrientation(CLabel.PageOrientation.ReverseLandscape);
+        }
+        else
+        {
+            label.setOrientation(CLabel.PageOrientation.Portrait);
+        }
+        return label;
+    }
+
+    /**
+     * TODO: Counter clockwise rotation
+     * @param label the label to rotate
+     * @return the rotated label
+     */
+    private static CLabel rotateCounterClockwise(final CLabel label)
+    {
+        for (AComponent component : label.getElements())
+        {
+            int yOffset = 0;
+            if (component instanceof ALinearBarcode)
+            {
+                ALinearBarcode linearBarcode = (ALinearBarcode)component;
+                yOffset = -linearBarcode.getHeight();
+            }
+            else if (component instanceof AFontComponent)
+            {
+                AFontComponent fontComponent = (AFontComponent)component;
+                yOffset = -Math.round(fontComponent.getFontSize());
+            }
+            final int newX = component.getTop();
+            final int newY = label.getWidth() - component.getLeft() + yOffset;
+            component.setLeft(newX);
+            component.setTop(newY);
+        }
+
+        // TODO: Do we really want to do this?
+        //final int newWidth = label.getHeight();
+        //final int newHeight = label.getWidth();
+        //label.setWidth(newWidth);
+        //label.setHeight(newHeight);
+
+        return label;
+    }
+
+    /**
+     *
+     * @param image the image to rotate
+     * @param degrees number of degrees to rotate
+     * @return the rotated image
+     */
+    public static BufferedImage rotateImage(final BufferedImage image, int degrees)
+    {
+        final double rads = Math.toRadians(degrees);
+        final double sin = Math.abs(Math.sin(rads));
+        final double cos = Math.abs(Math.cos(rads));
+        final int w = (int) Math.floor(image.getWidth() * cos + image.getHeight() * sin);
+        final int h = (int) Math.floor(image.getHeight() * cos + image.getWidth() * sin);
+        final BufferedImage rotatedImage = new BufferedImage(w, h, image.getType());
+        final AffineTransform at = new AffineTransform();
+        at.translate(w * 0.5d, h * 0.5d);
+        at.rotate(rads,0, 0);
+        at.translate(-image.getWidth() * 0.5d, -image.getHeight() * 0.5d);
+        final AffineTransformOp rotateOp = new AffineTransformOp(at, AffineTransformOp.TYPE_BILINEAR);
+        rotateOp.filter(image, rotatedImage);
+        return rotatedImage;
+    }
+}