fillPolygonの使い方を教えてください

Question

前提・実現したいこと

三角形をカーソルを使ってかけるようにしたいのですが、やり方が分かりません･･･
この場合、新しくzといった変数を作るのが方法かなと考えましたが･･･

発生している問題・エラーメッセージ

三角形の作り方が分かりません･･･

該当のソースコード

こちらが、メインのクラスのコードです
package kadai;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.control.ColorPicker;
import javafx.scene.control.Menu;
import javafx.scene.control.MenuBar;
import javafx.scene.control.MenuItem;
import javafx.scene.control.RadioMenuItem;
import javafx.scene.control.ToggleGroup;
import javafx.scene.control.ToolBar;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.BorderPane;
import javafx.scene.paint.Color;
import javafx.stage.FileChooser;
import javafx.stage.Stage;

public class twelve extends Application{
		private Canvas cv;
        private ToolBar tb;
        private ColorPicker cp;
        private ToggleGroup tg;
        private RadioMenuItem[] rmi = new RadioMenuItem[4];
        private MenuItem[] mi = new MenuItem[2];
        private Menu [] mn = new Menu[3];
        private MenuBar mb;
        private ArrayList<Shape> shapeList;
        private int currentShape;
        private Color currentColor;
        private double x1,x2,y1,y2;
		public static void main(String[]args) {
				launch(args);
			}
		public void start(Stage stage)throws Exception{
			cv = new Canvas(600,340);
			mb = new MenuBar();
			cp = new ColorPicker();
			tb = new ToolBar();

			mn[0] = new Menu("ファイル");
			mn[1] = new Menu("設定");
			mn[2] = new Menu("図形");

			mi[0] = new MenuItem("開く");
			mi[1] = new MenuItem("保存");

			rmi[0] = new RadioMenuItem("四角形");
			rmi[1] = new RadioMenuItem("楕円");
			rmi[2] = new RadioMenuItem("直線");
			rmi[3] = new RadioMenuItem("三角形");

			mn[0].getItems().add(mi[0]);
			mn[0].getItems().add(mi[1]);

			mn[1].getItems().add(mn[2]);

			mn[2].getItems().add(rmi[0]);
			mn[2].getItems().add(rmi[1]);
			mn[2].getItems().add(rmi[2]);
			mn[2].getItems().add(rmi[3]);

			mb.getMenus().add(mn[0]);
			mb.getMenus().add(mn[1]);

			tb.getItems().add(cp);

			tg = new ToggleGroup();
			rmi[0].setToggleGroup(tg);
			rmi[1].setToggleGroup(tg);
			rmi[2].setToggleGroup(tg);
			rmi[3].setToggleGroup(tg);

			BorderPane bp = new BorderPane();

			bp.setTop(mb);
			bp.setCenter(cv);
			bp.setBottom(tb);

			for(int i = 0;i<mi.length;i++) {
				mi[i].setOnAction(new SampleEventHandler());
			}
			for(int i = 0;i<rmi.length;i++) {
				rmi[i].setOnAction(new SampleEventHandler());
			}
			cp.setOnAction(new SampleEventHandler());

			cv.addEventHandler(MouseEvent.MOUSE_PRESSED,(new SampleEventHandler()));
			cv.addEventHandler(MouseEvent.MOUSE_RELEASED,(new SampleEventHandler()));

			shapeList =new ArrayList<Shape>();
			currentShape = Shape.TRI;
			currentColor = Color.RED;
			cp.setValue(currentColor);
			rmi[0].setSelected(true);
			x1 = -1;y1 = -1;x2 = 1;y2 = -1;

			Scene sc = new Scene(bp,600,400);

			stage.setScene(sc);
			stage.setTitle("サンプル");
			stage.show();
		}
		class SampleEventHandler implements EventHandler<ActionEvent>{
			public void handle(ActionEvent e) {
if(e.getSource() == mi[0]) {
	try {
		FileChooser fc = new FileChooser();
		fc.getExtensionFilters().add(
			new FileChooser.ExtensionFilter("グラフィックファイル", "*,g"));
			File flo = fc.showOpenDialog(new Stage());
			if(flo != null) {
				ObjectInputStream oi = new ObjectInputStream(new FileInputStream(flo));
				Shape tmp = null;
				shapeList.clear();
				while((tmp = (Shape)oi.readObject())!= null){
shapeList.add(tmp);
				}
				oi.close();
			}
		}
		catch(Exception ex) {
			ex.printStackTrace();
		}
		GraphicsContext gc = cv.getGraphicsContext2D();
		gc.clearRect(0, 0, 600, 340);
		for(int i = 0;i<shapeList.size();i++) {
			Shape sh = (Shape)shapeList.get(i);
			sh.draw(gc);
		}
	}else if(e.getSource() == mi[1]) {
		try {
			FileChooser fc = new FileChooser();
			fc.getExtensionFilters().add(
				new FileChooser.ExtensionFilter("グラフィックファイル", "*,g"));
				File fls = fc.showOpenDialog(new Stage());
				if(fls != null) {
					ObjectOutputStream oo = new ObjectOutputStream(new FileOutputStream(fls));
					for(int i = 0;i<shapeList.size();i++) {
						oo.writeObject(shapeList.get(i));
					}
					oo.writeObject(null);
					oo.close();
		}
	}
		catch(Exception ex) {
			ex.printStackTrace();
		}
}
	else if(e.getSource() == rmi[0]) {
		currentShape = Shape.RECT;
	}
	else if(e.getSource() == rmi[1]) {
		currentShape = Shape.OVAL;
	}
	else if(e.getSource() == rmi[2]) {
		currentShape = Shape.LINE;
	}
	else if(e.getSource() == rmi[3]) {
		currentShape = Shape.TRI;
	}
	else if(e.getSource() == cp) {
		currentColor = cp.getValue();
	}
			}
		}
		class SampleMouseEventHandler implements EventHandler<MouseEvent>{
			public void handle(MouseEvent e) {
if(e.getEventType() == MouseEvent.MOUSE_PRESSED) {
	x2 = e.getX();
	y2 = e.getY();
	if(x1 < 0 || y1 < 0 ||(x1  == x2 && y1 == y2))
	return;
	Shape sh = null;
	if(currentShape == Shape.RECT){
		sh = new Rect();
	}
	else if(currentShape == Shape.OVAL) {
		sh = new Rect();
			}
else if(currentShape == Shape.LINE) {
	    sh = new Trian();
		}
else if(currentShape == Shape.TRI) {
    sh = new Trian();
	}
			double r = currentColor.getRed();
			double g= currentColor.getGreen();
			double b = currentColor.getBlue();
			sh.setColor(r,g,b);

			if(currentShape != Shape.LINE){
				if(x1 > x2) {
					x2 = x1;
					x1 = e.getX();
				}
				if(y1 > y2) {
					y2 = y1;
					y1 = e.getX();
				}
			}
			sh.setStartPoint(x1,y1);
			sh.setEndPoint(x2,y2);

			shapeList.add(sh);

			GraphicsContext gc = cv.getGraphicsContext2D();
			sh.draw(gc);
		}
	}
	}

}
こちらが、メインのクラスで必要となるShapeクラスのコードです
package kadai;

import java.io.Serializable;

import javafx.scene.canvas.GraphicsContext;
import javafx.scene.paint.Color;

abstract class Shape implements Serializable{
 static final int RECT = 0;
 static final int OVAL = 1;
 static final int LINE = 2;
 static final int TRI = 3;

 double x1,y1,x2,y2;
 double r,g,b;

 abstract public void draw(GraphicsContext gc);

 public void setColor(double r,double g,double b) {
	 this.r = r;
	 this.g = g;
	 this.b = b;
 }
 public void setStartPoint(double x,double y) {
	 x1 = x;
	 y1 = y;
 }
 public void setEndPoint(double x,double y) {
	 x2 = x;
	 y2 = y;
 }
}
class Rect extends Shape implements Serializable{
	public void draw(GraphicsContext gc) {
		gc.setFill(Color.color(r,g,b));
		gc.fillRect(x1, y1, x2-x1, y2-y1);
	}
}
class Oval extends Shape implements Serializable{
	public void draw(GraphicsContext gc) {
		gc.setFill(Color.color(r,g,b));
		gc.fillOval(x1, y1, x2-x1, y2-y1);
	}
}
class Line extends Shape implements Serializable{
	public void draw(GraphicsContext gc) {
		gc.setStroke(Color.color(r,g,b));
		gc.strokeLine(x1, y1, x2, y2);
	}
}
class Trian extends Shape implements Serializable{
	public void draw(GraphicsContext gc) {
		gc.setFill(Color.color(r,g,b));
		gc.fillPolygon();
	}
}

試したこと

多角形の作り方を調べました。

補足情報（FW/ツールのバージョンなど）

jdk14

Answer 1

三角形の作り方が分かりません･･･

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.AnchorPane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Polygon;
import javafx.stage.Stage;

public class HogePolygon extends Application {

  public static void main(String[] args) {
    launch(args);
  }

  @Override
  public void start(Stage stage) throws Exception {
    final Polygon polygon = new Polygon();
    polygon.getPoints().addAll(new Double[]{
        0.0, 0.0,
        20.0, 10.0,
        10.0, 20.0});
    polygon.setFill(Color.RED);

    final AnchorPane pane = new AnchorPane(polygon);

    Scene scene = new Scene(pane);
    stage.setScene(scene);
    stage.setHeight(100);
    stage.setWidth(100);
    stage.show();
  }
}

Comments

[nakagen]

ご回答ありがとうございます！
shiketaさんの
polygon.getPoints().addAll(new Double[]{
0.0, 0.0,
20.0, 10.0,
10.0, 20.0});
のコードで、解決までのヒントにさせて頂きました！