JavaFX Sketch Pad

	package jayfx;
	import java.lang.reflect.Field;
	import java.lang.reflect.Modifier;
	import javafx.application.Application;
	import javafx.event.ActionEvent;
	import javafx.event.EventHandler;
	import javafx.geometry.Pos;
	import javafx.scene.Cursor;
	import javafx.scene.Group;
	import javafx.scene.Scene;
	import javafx.scene.control.Button;
	import javafx.scene.control.Label;
	import javafx.scene.control.Slider;
	import javafx.scene.control.Tooltip;
	import javafx.scene.input.MouseEvent;
	import javafx.scene.layout.FlowPane;
	import javafx.scene.layout.HBox;
	import javafx.scene.layout.StackPane;
	import javafx.scene.layout.VBox;
	import javafx.scene.paint.Color;
	import javafx.scene.shape.Line;
	import javafx.scene.shape.LineTo;
	import javafx.scene.shape.MoveTo;
	import javafx.scene.shape.Path;
	import javafx.scene.shape.Rectangle;
	import javafx.stage.Stage;
	public class Draw2 extends Application {
	private Path path;
	private Group lineGroup;
	private static final Double DEFAULTSTROKE = 3.0;
	private static final Double MAXSTROKE = 30.0;
	private static final Double MINSTROKE = 1.0;
	/**
	* @param args the command line arguments
	*/
	public static void main(String[] args) {
	Application.launch(args);
	}
	@Override
	public void start(Stage primaryStage) {
	primaryStage.setTitle("Drawing Tool");
	final Group root = new Group();
	Scene scene = new Scene(root, 600, 400);
	// A group to hold all the drawn path elements
	lineGroup = new Group();
	// Build the slider, label, and button and their VBox layout container
	Button btnClear = new Button();
	btnClear.setText("Clear");
	btnClear.setOnAction(new EventHandler<ActionEvent>() {
	public void handle(ActionEvent event) {
	lineGroup.getChildren().removeAll(lineGroup.getChildren());
	}
	});
	Slider strokeSlider = new Slider(MINSTROKE, MAXSTROKE, DEFAULTSTROKE);
	Label labelStroke = new Label("Stroke Width");
	VBox utilBox = new VBox(10);
	utilBox.setAlignment(Pos.TOP_CENTER);
	utilBox.getChildren().addAll(btnClear, labelStroke, strokeSlider);
	// Build the sample line and its layout container
	final Line sampleLine = new Line(0, 0, 140, 0);
	sampleLine.strokeWidthProperty().bind(strokeSlider.valueProperty());
	sampleLine.setStroke(Color.BLUE);
	StackPane stackpane = new StackPane();
	stackpane.setPrefHeight(MAXSTROKE);
	stackpane.setPrefWidth(sampleLine.getEndX() + MAXSTROKE);
	stackpane.setAlignment(Pos.CENTER);
	stackpane.getChildren().add(sampleLine);
	// Build the color label and its layout container
	final Label colorLabel = new Label("color: blue");
	StackPane stackpane2 = new StackPane();
	stackpane2.setPrefHeight(MAXSTROKE);
	stackpane2.setPrefWidth(sampleLine.getEndX() + MAXSTROKE);
	stackpane2.setAlignment(Pos.CENTER_LEFT);
	stackpane2.getChildren().add(colorLabel);
	// Build the HBox layout container for the two stackpane's
	HBox lineBox = new HBox(20);
	lineBox.setAlignment(Pos.CENTER);
	lineBox.getChildren().addAll(stackpane, stackpane2);
	// Build the color picker and use a flowpane
	FlowPane flow = new FlowPane();
	flow.setVgap(2);
	flow.setHgap(2);
	flow.setPrefWrapLength(400);
	// Get the declared fields for the Color class
	Field[] colorFields = Color.class.getDeclaredFields();
	for (Field fieldname : colorFields) {
	int mods = fieldname.getModifiers();
	// Only look at the field if it's public, static, and NOT 'TRANSPARENT'
	if (Modifier.isPublic(mods) && Modifier.isStatic(mods)
	&& !(fieldname.getName().equals("TRANSPARENT"))) {
	try {
	Color c = Color.web(fieldname.getName());
	// Make a rectangle with that field name's color
	final Rectangle r = new Rectangle(15, 15, c);
	// Configure the rectangle
	r.setCursor(Cursor.HAND);
	Tooltip t = new Tooltip(fieldname.getName().toLowerCase());
	Tooltip.install(r, t);
	r.setUserData(t.getText());
	r.setOnMouseClicked(new EventHandler<MouseEvent>() {
	@Override
	public void handle(MouseEvent me) {
	sampleLine.setStroke(r.getFill());
	colorLabel.setText("color: " + ((String) r.getUserData()));
	}
	});
	flow.getChildren().add(r);
	} catch (IllegalArgumentException e) {
	// just ignore it if for some reason we can't make
	// a color
	}
	}
	}
	// Build the layout container for the VBox utility box and the flowpane
	HBox toolBox = new HBox(10);
	toolBox.setAlignment(Pos.TOP_CENTER);
	toolBox.getChildren().addAll(utilBox, flow);
	// Build the canvas
	final Rectangle canvas = new Rectangle(scene.getWidth() - 20, scene.getHeight() - 230);
	canvas.setCursor(Cursor.CROSSHAIR);
	canvas.setFill(Color.LIGHTGRAY);
	canvas.setOnMousePressed(new EventHandler<MouseEvent>() {
	@Override
	public void handle(MouseEvent me) {
	path = new Path();
	path.setMouseTransparent(true);
	path.setStrokeWidth(sampleLine.getStrokeWidth());
	path.setStroke(sampleLine.getStroke());
	lineGroup.getChildren().add(path);
	path.getElements().add(new MoveTo(me.getSceneX(), me.getSceneY()));
	}
	});
	canvas.setOnMouseReleased(new EventHandler<MouseEvent>() {
	@Override
	public void handle(MouseEvent me) {
	path = null;
	}
	});
	canvas.setOnMouseDragged(new EventHandler<MouseEvent>() {
	@Override
	public void handle(MouseEvent me) {
	// keep lines within rectangle
	if (canvas.getBoundsInLocal().contains(me.getX(), me.getY())) {
	path.getElements().add(new LineTo(me.getSceneX(), me.getSceneY()));
	}
	}
	});
	// Build the VBox container for the lineBox, canvas, and toolBox
	VBox vb = new VBox(20);
	vb.setLayoutX(10);
	vb.setLayoutY(20);
	vb.getChildren().addAll(lineBox, canvas, toolBox);
	root.getChildren().addAll(vb, lineGroup);
	primaryStage.setScene(scene);
	primaryStage.show();
	}
	}

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