I am still having trouble with getting my Sierpinski Triangle to work. The trian
ID: 666677 • Letter: I
Question
I am still having trouble with getting my Sierpinski Triangle to work. The triangle still shows in the left upper corner and my+ and - buttons do not work. Any help is appreciated.
package sierpinskitriangle;
import javafx.application.Application;
import javafx.geometry.Point2D;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Polygon;
import javafx.stage.Stage;
import javafx.scene.control.Button;
public class SierpinskiTriangle extends Application {
@Override // Override the start method in the Application class
public void start(Stage primaryStage) {
SierpinskiTrianglePane trianglePane = new SierpinskiTrianglePane();
Button plus = new Button ("+");
Button minus = new Button ("-");
plus.setAlignment(Pos.BOTTOM_RIGHT);
minus.setAlignment (Pos.BOTTOM_LEFT);
HBox hBox = new HBox(10);
hBox.getChildren().addAll(plus,minus);
hBox.setAlignment(Pos.CENTER);
BorderPane borderPane = new BorderPane();
borderPane.setCenter(trianglePane);
borderPane.setBottom(hBox);
TextField tfOrder = new TextField();
tfOrder.setOnAction(
e -> trianglePane.setOrder(Integer.parseInt(tfOrder.getText())));
tfOrder.setPrefColumnCount(4);
tfOrder.setAlignment(Pos.BOTTOM_RIGHT);
// Create a scene and place it in the stage
Scene scene = new Scene(borderPane, 200, 210);
primaryStage.setTitle("SierpinskiTriangle"); // Set the stage title
primaryStage.setScene(scene); // Place the scene in the stage
primaryStage.show(); // Display the stage
scene.widthProperty().addListener(ov -> trianglePane.paint());
scene.heightProperty().addListener(ov -> trianglePane.paint());
}
/** Pane for displaying triangles */
static class SierpinskiTrianglePane extends Pane {
private int order = 0;
/** Set a new order */
public void setOrder(int order) {
this.order = order;
paint();
}
SierpinskiTrianglePane() {
}
protected void paint() {
// Select three points in proportion to the panel size
Point2D p1 = new Point2D(getWidth() / 2, 10);
Point2D p2 = new Point2D(10, getHeight() - 10);
Point2D p3 = new Point2D(getWidth() - 10, getHeight() - 10);
this.getChildren().clear(); // Clear the pane before redisplay
displayTriangles(order, p1, p2, p3);
}
private void displayTriangles(int order, Point2D p1,
Point2D p2, Point2D p3) {
if (order == 0) {
// Draw a triangle to connect three points
Polygon triangle = new Polygon();
triangle.getPoints().addAll(p1.getX(), p1.getY(), p2.getX(),
p2.getY(), p3.getX(), p3.getY());
triangle.setStroke(Color.BLACK);
triangle.setFill(Color.WHITE);
this.getChildren().add(triangle);
}
else
if (order > 0)
{
// Get the midpoint on each edge in the triangle
Point2D p12 = p1.midpoint(p2);
Point2D p23 = p2.midpoint(p3);
Point2D p31 = p3.midpoint(p1);
// Recursively display three triangles
displayTriangles(order - 1, p1, p12, p31);
displayTriangles(order - 1, p12, p2, p23);
displayTriangles(order - 1, p31, p23, p3);
}
}
}
I am still having trouble with getting my Sierpinski Triangle to work. The triangle still shows in the left upper corner and my+ and - buttons do not work. Any help is appreciated.
package sierpinskitriangle;
import javafx.application.Application;
import javafx.geometry.Point2D;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Polygon;
import javafx.stage.Stage;
import javafx.scene.control.Button;
public class SierpinskiTriangle extends Application {
@Override // Override the start method in the Application class
public void start(Stage primaryStage) {
SierpinskiTrianglePane trianglePane = new SierpinskiTrianglePane();
Button plus = new Button ("+");
Button minus = new Button ("-");
plus.setAlignment(Pos.BOTTOM_RIGHT);
minus.setAlignment (Pos.BOTTOM_LEFT);
HBox hBox = new HBox(10);
hBox.getChildren().addAll(plus,minus);
hBox.setAlignment(Pos.CENTER);
BorderPane borderPane = new BorderPane();
borderPane.setCenter(trianglePane);
borderPane.setBottom(hBox);
TextField tfOrder = new TextField();
tfOrder.setOnAction(
e -> trianglePane.setOrder(Integer.parseInt(tfOrder.getText())));
tfOrder.setPrefColumnCount(4);
tfOrder.setAlignment(Pos.BOTTOM_RIGHT);
// Create a scene and place it in the stage
Scene scene = new Scene(borderPane, 200, 210);
primaryStage.setTitle("SierpinskiTriangle"); // Set the stage title
primaryStage.setScene(scene); // Place the scene in the stage
primaryStage.show(); // Display the stage
scene.widthProperty().addListener(ov -> trianglePane.paint());
scene.heightProperty().addListener(ov -> trianglePane.paint());
}
/** Pane for displaying triangles */
static class SierpinskiTrianglePane extends Pane {
private int order = 0;
/** Set a new order */
public void setOrder(int order) {
this.order = order;
paint();
}
SierpinskiTrianglePane() {
}
protected void paint() {
// Select three points in proportion to the panel size
Point2D p1 = new Point2D(getWidth() / 2, 10);
Point2D p2 = new Point2D(10, getHeight() - 10);
Point2D p3 = new Point2D(getWidth() - 10, getHeight() - 10);
this.getChildren().clear(); // Clear the pane before redisplay
displayTriangles(order, p1, p2, p3);
}
private void displayTriangles(int order, Point2D p1,
Point2D p2, Point2D p3) {
if (order == 0) {
// Draw a triangle to connect three points
Polygon triangle = new Polygon();
triangle.getPoints().addAll(p1.getX(), p1.getY(), p2.getX(),
p2.getY(), p3.getX(), p3.getY());
triangle.setStroke(Color.BLACK);
triangle.setFill(Color.WHITE);
this.getChildren().add(triangle);
}
else
if (order > 0)
{
// Get the midpoint on each edge in the triangle
Point2D p12 = p1.midpoint(p2);
Point2D p23 = p2.midpoint(p3);
Point2D p31 = p3.midpoint(p1);
// Recursively display three triangles
displayTriangles(order - 1, p1, p12, p31);
displayTriangles(order - 1, p12, p2, p23);
displayTriangles(order - 1, p31, p23, p3);
}
}
}
Explanation / Answer
Answer:
There is no actionlistner on button click.
For + button
For - Button
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