arrange und align Funktionen

src/main/java/schule/ngb/zm/shapes/ShapeGroup.java

@@ -5,6 +5,7 @@ import schule.ngb.zm.Options;
 import java.awt.Graphics2D;
 import java.awt.geom.AffineTransform;
 import java.awt.geom.Path2D;
+import java.awt.geom.Point2D;
 import java.util.ArrayList;
 import java.util.LinkedList;
 import java.util.List;
@@ -28,9 +29,20 @@ import java.util.List;
  * benötigen, erst nach Hinzufügen der Gruppenelemente ausgeführt werden.
  * Nachdem sich die Zusammensetzung der Gruppe geändert hat, muss die Gruppe
  * ggf. neu ausgerichtet werden.
+ * <p>
+ * Für die Ausrichtung der Elemente in einer Gruppe können
+ * {@link #arrange(Options.Direction, double)},
+ * {@link #arrangeInGrid(int, Options.Direction, double, int)} und
+ * {@link #align(Options.Direction)} verwendet werden, die jeweils die Position
+ * der Formen in der Gruppe ändern und nicht die Position der Gruppe selbst (so
+ * wie z.B. {@link #alignTo(Shape, Options.Direction)}.
  */
 public class ShapeGroup extends Shape {
 
+	public static final int ARRANGE_ROWS = 0;
+
+	public static final int ARRANGE_COLS = 1;
+
 	private List<Shape> shapes;
 
 	private double groupWidth = -1.0;
@@ -132,6 +144,111 @@ public class ShapeGroup extends Shape {
 		return groupHeight;
 	}
 
+	public void arrange( Options.Direction dir, double buffer ) {
+		Shape last = null;
+		for( Shape s : shapes ) {
+			if( last != null ) {
+				s.nextTo(last, dir, buffer);
+			} else {
+				s.moveTo(0, 0);
+			}
+			last = s;
+		}
+		invalidateBounds();
+	}
+
+	public void arrangeInRows( int n, Options.Direction dir, double buffer ) {
+		arrangeInGrid(n, dir, buffer, ARRANGE_ROWS);
+	}
+
+	public void arrangeInColumns( int n, Options.Direction dir, double buffer ) {
+		arrangeInGrid(n, dir, buffer, ARRANGE_COLS);
+	}
+
+	public void arrangeInGrid( int n, Options.Direction dir, double buffer, int mode ) {
+		// Calculate grid size
+		int rows, cols;
+		if( mode == ARRANGE_ROWS ) {
+			rows = n;
+			cols = (int) ceil(shapes.size() / n);
+		} else {
+			cols = n;
+			rows = (int) ceil(shapes.size() / n);
+		}
+
+		// Calculate grid cell size
+		double maxHeight = shapes.stream().mapToDouble(
+			( s ) -> s.getHeight()
+		).reduce(0.0, Double::max);
+		double maxWidth = shapes.stream().mapToDouble(
+			( s ) -> s.getWidth()
+		).reduce(0.0, Double::max);
+		double halfHeight = maxHeight * .5;
+		double halfWidth = maxWidth * .5;
+
+		// Layout shapes
+		for( int i = 0; i < shapes.size(); i++ ) {
+			// Calculate center of grid cell
+			int row, col;
+			switch( dir ) {
+				case UP:
+				case NORTH:
+					row = rows - i % rows;
+					col = cols - (i / rows);
+					break;
+				case LEFT:
+				case WEST:
+					row = rows - (i / cols);
+					col = cols - i % cols;
+					break;
+				case RIGHT:
+				case EAST:
+					row = i / cols;
+					col = i % cols;
+					break;
+				case DOWN:
+				case SOUTH:
+				default:
+					row = i % rows;
+					col = i / rows;
+					break;
+			}
+
+			double centerX = halfWidth + col * (maxWidth + buffer);
+			double centerY = halfHeight + row * (maxHeight + buffer);
+
+			// Move shape to proper anchor location in cell
+			Shape s = shapes.get(i);
+			Point2D ap = Shape.getAnchorPoint(maxWidth, maxHeight, s.getAnchor());
+			s.moveTo(centerX + ap.getX(), centerY + ap.getY());
+		}
+
+		invalidateBounds();
+	}
+
+	public void align( Options.Direction dir ) {
+		Shape target = shapes.stream().reduce(null,
+			( t, s ) -> {
+				if( t == null ) return s;
+				Point2D apt = t.getAbsAnchorPoint(dir);
+				Point2D aps = s.getAbsAnchorPoint(dir);
+				if( apt.getX() * dir.x >= aps.getX() * dir.x && apt.getY() * dir.y >= aps.getY() * dir.y ) {
+					return t;
+				} else {
+					return s;
+				}
+			}
+		);
+
+		for( Shape s : shapes ) {
+			if( s != target ) {
+				s.alignTo(target, dir);
+			}
+		}
+
+		invalidateBounds();
+	}
+
 	private void invalidateBounds() {
 		groupWidth = -1.0;
 		groupHeight = -1.0;
@@ -148,6 +265,25 @@ public class ShapeGroup extends Shape {
 			maxy = Math.max(maxy, bounds.y + bounds.height);
 		}
 
+		//groupWidth = maxx - minx;
+		//groupHeight = maxy - miny;
+		groupWidth = maxx;
+		groupHeight = maxy;
+	}
+
+	public void pack() {
+		double minx = Double.MAX_VALUE, miny = Double.MAX_VALUE,
+			maxx = Double.MIN_VALUE, maxy = Double.MIN_VALUE;
+		for( Shape pShape : shapes ) {
+			Bounds bounds = pShape.getBounds();
+			minx = Math.min(minx, bounds.x);
+			maxx = Math.max(maxx, bounds.x + bounds.width);
+			miny = Math.min(miny, bounds.y);
+			maxy = Math.max(maxy, bounds.y + bounds.height);
+		}
+
+		x = minx;
+		y = miny;
 		groupWidth = maxx - minx;
 		groupHeight = maxy - miny;
 	}