ConcaveHull.java

package fjr.hull.test;

import java.awt.Point;
import java.util.ArrayList;

import signalprocesser.voronoi.VPoint;
import signalprocesser.voronoi.VoronoiAlgorithm;
import signalprocesser.voronoi.representation.triangulation.TriangulationRepresentation;
import signalprocesser.voronoi.representation.triangulation.VHalfEdge;


import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.control.Button;
import javafx.scene.input.MouseEvent;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

public class ConcaveHull extends Application{
	
	int width_ = 400;
	int height_ = 400;
	Canvas canvas;
	GraphicsContext gc;
	
	@Override
	public void start(Stage stage) throws Exception {

		Group root = new Group();
		canvas = new Canvas(width_ - 30, height_ - 30);
		gc = canvas.getGraphicsContext2D();
		canvas.setTranslateX(15);
		canvas.setTranslateY(15);

		listPoint = new ArrayList<VPoint>();
		root.getChildren().add(canvas);

		tr = new TriangulationRepresentation();
		tr.setCalcCutOff(new TriangulationRepresentation.CalcCutOff() {
			@Override
			public int calculateCutOff(TriangulationRepresentation representation) {
				return 120; //  kayaknya ini nilai ideal... 
			}
		});
		
		stage.setScene(new Scene(root, width_, height_));
		stage.show();
		stage.setTitle("concave-hull: klik di atas  canvas");

		canvas.addEventHandler(MouseEvent.MOUSE_PRESSED,
				new EventHandler<MouseEvent>() {
					public void handle(MouseEvent t) {
						int x = (int) t.getX();
						int y = (int) t.getY();
						listPoint.add(tr.createPoint(x,y));
						draw(gc, null, null, null, null);
						concaveHull();

					}
				});
		
		Button btn = new Button(){{
			setText("CLEAR"); 
			setTranslateX(10);
			setTranslateY(10);
			setOnAction(new EventHandler<ActionEvent>() {

				public void handle(ActionEvent arg0) {
					listPoint.clear();
					draw(gc, null, null, null, null);
					concaveHull();
				}
			});
		}}; 
		
		root.getChildren().add(btn); 
	}
	
	

	ArrayList<VPoint> listPoint;

	public void createRandomDot() {
		
		int width = ((int) canvas.getWidth()) - 35;
		int height = ((int) canvas.getHeight()) - 35;
		for (int i = 0; i < 1; i++) {
			int c = ((int) (Math.random() * (width)));
			int d = ((int) (Math.random() * (height)));
			if (c + 35 < width)
				c += 35;
			if (d + 35 < height)
				d += 35;
			listPoint.add(tr.createPoint(c,d));
		}
	}
	
	TriangulationRepresentation tr; 
	
	public void concaveHull(){
		if( gc == null )
			return; 
		gc.setStroke(Color.BLACK);
		VoronoiAlgorithm.generateVoronoi(tr , listPoint);
		VHalfEdge outeredge = tr.getOuterEdge();
        if ( outeredge==null || outeredge.next==null ) {
            return;
        }
        VHalfEdge curredge = outeredge;
        do {
            gc.strokeLine( curredge.getX() , curredge.getY() , curredge.next.getX() , curredge.next.getY() );
        } while ( (curredge=curredge.next).next!=null && curredge!=outeredge );
	}
	

	public void draw(GraphicsContext gc, ArrayList<Point> list, Color color,
			ArrayList<Point> secondList, Color c) {
		gc.setFill(Color.WHITE);
		gc.fillRect(0, 0, canvas.getWidth(), canvas.getHeight());
		gc.setFill(Color.RED);
		for (int i = 0; i < listPoint.size(); i++) {
			gc.fillOval(listPoint.get(i).x - 2.5, listPoint.get(i).y - 2.5, 5,
					5);
		}
	}
	
	public static void main(String[] args){
		launch(args);
		
	}

}