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package javafx.scene.shape;

import com.sun.javafx.collections.TrackableObservableList;
import com.sun.javafx.geom.BaseBounds;
import com.sun.javafx.geom.Path2D;
import com.sun.javafx.geom.transform.BaseTransform;
import com.sun.javafx.scene.DirtyBits;
import com.sun.javafx.scene.NodeHelper;
import com.sun.javafx.scene.shape.PolygonHelper;
import com.sun.javafx.scene.shape.ShapeHelper;
import com.sun.javafx.sg.prism.NGNode;
import com.sun.javafx.sg.prism.NGPolygon;
import com.sun.javafx.sg.prism.NGShape;
import javafx.collections.ListChangeListener.Change;
import javafx.collections.ObservableList;
import javafx.scene.Node;
import javafx.scene.paint.Paint;

Creates a polygon, defined by an array of x,y coordinates. The Polygon class is similar to the Polyline class, except that the Polyline class is not automatically closed.
import javafx.scene.shape.*;
Polygon polygon = new Polygon();
polygon.getPoints().addAll(new Double[]{
0.0, 0.0,
20.0, 10.0,
10.0, 20.0 });
Since:JavaFX 2.0
/** * Creates a polygon, defined by an array of x,y coordinates. The Polygon * class is similar to the Polyline class, except that the Polyline class * is not automatically closed. * <PRE> import javafx.scene.shape.*; Polygon polygon = new Polygon(); polygon.getPoints().addAll(new Double[]{ 0.0, 0.0, 20.0, 10.0, 10.0, 20.0 }); </PRE> * @since JavaFX 2.0 */
public class Polygon extends Shape { static { PolygonHelper.setPolygonAccessor(new PolygonHelper.PolygonAccessor() { @Override public NGNode doCreatePeer(Node node) { return ((Polygon) node).doCreatePeer(); } @Override public void doUpdatePeer(Node node) { ((Polygon) node).doUpdatePeer(); } @Override public BaseBounds doComputeGeomBounds(Node node, BaseBounds bounds, BaseTransform tx) { return ((Polygon) node).doComputeGeomBounds(bounds, tx); } @Override public com.sun.javafx.geom.Shape doConfigShape(Shape shape) { return ((Polygon) shape).doConfigShape(); } }); } private final Path2D shape = new Path2D(); { // To initialize the class helper at the begining each constructor of this class PolygonHelper.initHelper(this); }
Creates an empty instance of Polygon.
/** * Creates an empty instance of Polygon. */
public Polygon() { }
Creates a new instance of Polygon.
Params:
  • points – the coordinates of the polygon vertices
/** * Creates a new instance of Polygon. * @param points the coordinates of the polygon vertices */
public Polygon(double... points) { if (points != null) { for (double p : points) { this.getPoints().add(p); } } }
Defines the coordinates of the polygon vertices.
@defaultValueempty
/** * Defines the coordinates of the polygon vertices. * * @defaultValue empty */
private final ObservableList<Double> points = new TrackableObservableList<Double>() { @Override protected void onChanged(Change<Double> c) { NodeHelper.markDirty(Polygon.this, DirtyBits.NODE_GEOMETRY); NodeHelper.geomChanged(Polygon.this); } };
Gets the coordinates of the Polygon vertices.
Returns:An observable list of vertices of this Polygon
/** * Gets the coordinates of the {@code Polygon} vertices. * @return An observable list of vertices of this {@code Polygon} */
public final ObservableList<Double> getPoints() { return points; } /* * Note: This method MUST only be called via its accessor method. */ private NGNode doCreatePeer() { return new NGPolygon(); } /* * Note: This method MUST only be called via its accessor method. */ private BaseBounds doComputeGeomBounds(BaseBounds bounds, BaseTransform tx) { if (getMode() == NGShape.Mode.EMPTY || getPoints().size() <= 1) { return bounds.makeEmpty(); } if (getPoints().size() == 2) { if (getMode() == NGShape.Mode.FILL || getStrokeType() == StrokeType.INSIDE) { return bounds.makeEmpty(); } double upad = getStrokeWidth(); if (getStrokeType() == StrokeType.CENTERED) { upad /= 2.0f; } return computeBounds(bounds, tx, upad, 0.5f, getPoints().get(0), getPoints().get(1), 0.0f, 0.0f); } else { return computeShapeBounds(bounds, tx, ShapeHelper.configShape(this)); } } /* * Note: This method MUST only be called via its accessor method. */ private Path2D doConfigShape() { double p1 = getPoints().get(0); double p2 = getPoints().get(1); shape.reset(); shape.moveTo((float)p1, (float)p2); final int numValidPoints = getPoints().size() & ~1; for (int i = 2; i < numValidPoints; i += 2) { p1 = getPoints().get(i); p2 = getPoints().get(i+1); shape.lineTo((float)p1, (float)p2); } shape.closePath(); return shape; } /* * Note: This method MUST only be called via its accessor method. */ private void doUpdatePeer() { if (NodeHelper.isDirty(this, DirtyBits.NODE_GEOMETRY)) { final int numValidPoints = getPoints().size() & ~1; float points_array[] = new float[numValidPoints]; for (int i = 0; i < numValidPoints; i++) { points_array[i] = (float)getPoints().get(i).doubleValue(); } final NGPolygon peer = NodeHelper.getPeer(this); peer.updatePolygon(points_array); } }
Returns a string representation of this Polygon object.
Returns:a string representation of this Polygon object.
/** * Returns a string representation of this {@code Polygon} object. * @return a string representation of this {@code Polygon} object. */
@Override public String toString() { final StringBuilder sb = new StringBuilder("Polygon["); String id = getId(); if (id != null) { sb.append("id=").append(id).append(", "); } sb.append("points=").append(getPoints()); sb.append(", fill=").append(getFill()); Paint stroke = getStroke(); if (stroke != null) { sb.append(", stroke=").append(stroke); sb.append(", strokeWidth=").append(getStrokeWidth()); } return sb.append("]").toString(); } }