replaced 'int rotation' by 'Orientation'

src/main/java/de/ph87/electro/circuit/Circuit.java

@@ -36,7 +36,7 @@ public class Circuit {
 
   private void addAndRotate(final Part part, final int rotate) {
     for (int i = 0; i < rotate % 4; i++) {
-      part.rotate();
+      part.clockwise();
     }
     add(part);
   }

src/main/java/de/ph87/electro/circuit/CircuitPanel.java

@@ -43,7 +43,7 @@ public class CircuitPanel extends JPanel {
             break;
           case BUTTON3:
             partOptional.ifPresent(part -> {
-              part.rotate();
+              part.clockwise();
               repaint();
             });
             break;

src/main/java/de/ph87/electro/circuit/dto/PartDto.java

@@ -1,6 +1,7 @@
 package de.ph87.electro.circuit.dto;
 
 import com.fasterxml.jackson.annotation.JsonTypeInfo;
+import de.ph87.electro.circuit.part.Orientation;
 import de.ph87.electro.circuit.part.Part;
 import de.ph87.electro.circuit.part.impl.*;
 import lombok.Getter;
@@ -23,7 +24,7 @@ public class PartDto {
 
   private int y;
 
-  private int rotation;
+  private Orientation orientation;
 
   private List<JunctionDto> junctions;
 
@@ -32,7 +33,7 @@ public class PartDto {
     this.name = part.getName();
     this.x = part.getX();
     this.y = part.getY();
-    this.rotation = part.getRotation();
+    this.orientation = part.getOrientation();
     this.junctions = part.getJunctions().stream().map(JunctionDto::new).toList();
   }
 

src/main/java/de/ph87/electro/circuit/part/Orientation.java

@@ -0,0 +1,37 @@
+package de.ph87.electro.circuit.part;
+
+import java.awt.geom.Point2D;
+import java.util.function.Function;
+
+import static java.lang.Math.PI;
+
+@SuppressWarnings("SuspiciousNameCombination")
+public enum Orientation {
+  R0(0, p -> new Point2D.Double(p.x, p.y)),
+  R1(1, p -> new Point2D.Double(1 - p.y, p.x)),
+  R2(2, p -> new Point2D.Double(1 - p.x, 1 - p.y)),
+  R3(3, p -> new Point2D.Double(p.y, 1 - p.x)),
+  ;
+
+  private final Function<Point2D.Double, Point2D.Double> map;
+
+  private final int deg90;
+
+  Orientation(final int deg90, final Function<Point2D.Double, Point2D.Double> map) {
+    this.deg90 = deg90;
+    this.map = map;
+  }
+
+  public Point2D.Double map(final Point2D.Double p) {
+    return map.apply(p);
+  }
+
+  public Orientation clockwise() {
+    return values()[(ordinal() + 1) % values().length];
+  }
+
+  public double getTheta() {
+    return PI / 2 * deg90;
+  }
+
+}

src/main/java/de/ph87/electro/circuit/part/Part.java

@@ -32,7 +32,7 @@ public abstract class Part {
 
   protected int y;
 
-  protected int rotation = 0;
+  protected Orientation orientation = Orientation.R0;
 
   protected final List<Junction> junctions = new ArrayList<>();
 
@@ -48,7 +48,7 @@ public abstract class Part {
     this.name = dto.getName();
     this.x = dto.getX();
     this.y = dto.getY();
-    this.rotation = dto.getRotation();
+    this.orientation = dto.getOrientation();
   }
 
   public void link(final List<Junction> junctions) {
@@ -65,8 +65,8 @@ public abstract class Part {
     junctions.forEach(junction -> junction.paint(g));
   }
 
-  public void rotate() {
-    rotation = (rotation + 1) % 4;
+  public void clockwise() {
+    orientation = orientation.clockwise();
     junctions.forEach(Junction::rotate);
   }
 

src/main/java/de/ph87/electro/circuit/part/impl/PartBattery.java

@@ -12,7 +12,6 @@ import java.awt.*;
 import java.awt.image.BufferedImage;
 
 import static de.ph87.electro.CONFIG.*;
-import static java.lang.Math.PI;
 
 @Getter
 @ToString(callSuper = true)
@@ -56,8 +55,8 @@ public class PartBattery extends Part {
   }
 
   @Override
-  public void rotate() {
-    super.rotate();
+  public void clockwise() {
+    super.clockwise();
   }
 
   public void startPropagation() {
@@ -80,7 +79,7 @@ public class PartBattery extends Part {
     final BufferedImage img = new BufferedImage(RASTER, RASTER, BufferedImage.TYPE_INT_ARGB);
     final Graphics2D x = (Graphics2D) img.getGraphics();
     x.translate(RASTER / 2, RASTER / 2);
-    x.rotate(PI / 2 * rotation);
+    x.rotate(orientation.getTheta());
     x.translate(-RASTER / 2, -RASTER / 2);
     line(x, JUNCTION_LEFT, HALF, HALF - GAP / 2 - MINUS_W / 2, HALF, Color.BLACK, SYMBOL_STROKE);
     line(x, HALF + GAP / 2 + PLUS_W / 2, HALF, JUNCTION_RIGHT, HALF, Color.BLACK, SYMBOL_STROKE);

src/test/java/de/ph87/electro/circuit/CircuitServiceTest.java

@@ -44,7 +44,7 @@ class CircuitServiceTest {
       assertEquals(originalPart.getName(), reloadedPart.getName());
       assertEquals(originalPart.getX(), reloadedPart.getX());
       assertEquals(originalPart.getY(), reloadedPart.getY());
-      assertEquals(originalPart.getRotation(), reloadedPart.getRotation());
+      assertEquals(originalPart.getOrientation(), reloadedPart.getOrientation());
       assertEquals(originalPart.getJunctions().size(), reloadedPart.getJunctions().size());
       for (final Junction originalJunction : originalPart.getJunctions()) {
         System.out.printf("  - Junction: %s\n", originalJunction.getUuid());