Question

Write a program that displays a convex regular polygon with m or n sides, where m is the last digit of your student number plus 3, n is the second last digit plus 3. Use two buttons named “before” and “after” to change the number of sides of the polygon. Click on “before” button will show a convex regular polygon with m sides and click on “after” will show a convex regular polygon with n sides. For example, a student with student ID number 100123456 should show 9-side polygon. Click on “after” button will show 8-sidepolygon and click on “before” button will show 9- side polygon. Please provide java code

Answer 1

Below are the screenshots of code & output:

Х Java - primeWindow.cpp/src/RegularPolygon.java - Eclipse File Edit Source Refactor Navigate Search Project Run Window Help Quick Access Java Debug FindTheSums.... binary Tree.java Bar_graph.java scenery.java Dscenery.java PushCounter... getlnput.java >> 6 Pig Latin.java Input D *RegularPol. Х D CheckingAcc... Driver.java FindTheSums... import javafx.application. Application; import javafx.event.ActionEvent; import javafx.event. EventHandler; import javafx.geometry.HPos; import javafx.geometry. Orientation; import javafx.geometry. Pos; import javafx.geometry.VPos; import javafx.scene. Scene; import javafx.scene.control.Button; import javafx.scene.layout. FlowPane; import javafx.scene. paint.Color; import javafx.scene. shape. Polygon; import javafx. stage. Stage; Before public class RegularPolygon extends Application { int N,M;/**the number input**/ static String rollNo; @Override public void start (final Stage primaryStage) { final double centerx=200;/** center of polygon**/ final double centery=200; /**center of polygon**/ final double radius=150;/**circumradius of polygon**/ N = rollno.charAt(rollno.length()-2)-'0'+3;/**getting value of N from 2nd last digit of roll no. **/ M = rollNo.charAt(rollNo.length()-1)-'0'+3; /**getting value of M from last digit of roll no.**/ final Polygon initial = new Polygon();/**Polygon**/ initial.setFill (Color.BLUE); for (int i =0; i<m ; i++)/**initially creating a polygon with M sides**/ initial.getPoints() .addAll(centerX+radius*Math.cos(2*i*Math.PI/M), centerY+radius*Math.sin(2*i*Math.PI/M)); Button before = new Button ("Before"); Button after = new Button ("After"); After before.setOnAction (new EventHandler<ActionEvent>() { /**if before is pressed**/ @Override public void handle (ActionEvent event) { initial.setFill (Color.BLUE); initial.getPoints().clear(); for (int i =0;i<M; i++)/**updating to polygon with M sides**/ initial.getPoints() .addAll(centerX+radius*Math.cos(2*i*Math.PI/M), centerY+radius*Math.sin(2*i*Math.PI/M)); } }); after.setOnAction (new EventHandler<ActionEvent>() { /**if after is pressed**/ @Override public void handle (ActionEvent event) { initial.setFill (Color. ORANGE); initial.getPoints().clear(); Writable Smart Insert 9:36

Х Java - primeWindow.cpp/src/RegularPolygon.java - Eclipse File Edit Source Refactor Navigate Search Project Run Window Help Quick Access Java Debug PushCounter... getlnput.java *RegularPol. >> 6 @ D CheckingAcc... Driver.java FindTheSums... D FindTheSums... binary Tree.java Bar_graph.java scenery.java scenery.java Pig Latin.java final Polygon initial = new Polygon();/**Polygon**/ Input initial. setFill (Color.BLUE) ; for (int i =0; i<; i++)/**initially creating a polygon with M sides**/ initial.getPoints() .addAll(centerX+radius*Math.cos(2*i*Math.PI/M), centerY+radius*Math.sin(2*i*Math.PI/M) Button before = new Button ("Before"); Button after = new Button ("After"); before.setOnAction (new EventHandler<ActionEvent>() {/**if before is pressed**/ @Override public void handle (ActionEvent event) { initial. setFill (Color.BLUE); initial.getPoints().clear(); for (int i =0; i<m; i++)/**updating to polygon with M sides**/ initial.getPoints() .addAll(centerX+radius*Math.cos(2*i*Math.PI/M), centerY+radius*Math.sin(2*i*Ma } }); after.setOnAction (new EventHandler<ActionEvent>() { /**if after is pressed**/ @Override public void handle (ActionEvent event) { initial.setFill (Color. ORANGE); initial.getPoints().clear(); for (int i =0;i<n; i++)/**updating to polygon with N sides**/ initial.getPoints() .addAll(centerX+radius*Math.cos(2*i*Math.PI/N), centerY+radius*Math.sin(2*i*Ma Before After }); /**input window layout properties**/ FlowPane root = new FlowPane(); root.setOrientation (Orientation. VERTICAL); root.setAlignment (Pos. CENTER); root.setColumnHalignment (HPOS. CENTER); root.setRowvalignment (VPOS.CENTER); root.setVgap (10); root.getChildren() .addAll(initial, before, after); Scene scene = new Scene (root, 500, 500); primaryStage.setTitle ("Input"); primaryStage.setScene (scene); primaryStage.show(); } public static void main(String[] args) { rollNo = "100123456";/**put your roll no. here**/ launch(args); } Writable Smart Insert 9:36

Below is the java code for same. The roll number needs to be written in main & the program wuld update the values of N & M accordingly.

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.HPos;
import javafx.geometry.Orientation;
import javafx.geometry.Pos;
import javafx.geometry.VPos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.FlowPane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Polygon;
import javafx.stage.Stage;

public class RegularPolygon extends Application {
int N,M;/**the number input**/
static String rollNo;
@Override
public void start(final Stage primaryStage) {
   final double centerX=200;/**center of polygon**/
       final double centerY=200;/**center of polygon**/
       final double radius=150;/**circumradius of polygon**/
   N = rollNo.charAt(rollNo.length()-2)-'0'+3;/**getting value of N from 2nd last digit of roll no.**/
   M = rollNo.charAt(rollNo.length()-1)-'0'+3;/**getting value of M from last digit of roll no.**/
final Polygon initial = new Polygon();/**Polygon**/
initial.setFill(Color.BLUE);
for(int i =0 ; i < M ; i++)/**initially creating a polygon with M sides**/
   initial.getPoints().addAll(centerX+radius*Math.cos(2*i*Math.PI/M),centerY+radius*Math.sin(2*i*Math.PI/M));
Button before = new Button("Before");
Button after = new Button("After");
  
before.setOnAction(new EventHandler<ActionEvent>() {/**if before is pressed**/
@Override
public void handle(ActionEvent event) {
initial.setFill(Color.BLUE);
   initial.getPoints().clear();
for(int i =0 ; i < M ; i++)/**updating to polygon with M sides**/
   initial.getPoints().addAll(centerX+radius*Math.cos(2*i*Math.PI/M),centerY+radius*Math.sin(2*i*Math.PI/M));
}
});   
after.setOnAction(new EventHandler<ActionEvent>() {/**if after is pressed**/
@Override
public void handle(ActionEvent event) {
initial.setFill(Color.ORANGE);
   initial.getPoints().clear();
for(int i =0 ; i < N ; i++)/**updating to polygon with N sides**/
   initial.getPoints().addAll(centerX+radius*Math.cos(2*i*Math.PI/N),centerY+radius*Math.sin(2*i*Math.PI/N));
}
});
/**input window layout properties**/
FlowPane root = new FlowPane();
root.setOrientation(Orientation.VERTICAL);
root.setAlignment(Pos.CENTER);
root.setColumnHalignment(HPos.CENTER);
root.setRowValignment(VPos.CENTER);
root.setVgap(10);
root.getChildren().addAll(initial,before,after);
Scene scene = new Scene(root, 500, 500);
primaryStage.setTitle("Regular Polygon");
primaryStage.setScene(scene);
primaryStage.show();
}

public static void main(String[] args) {
   rollNo = "100123456";/**put your roll no. here**/
launch(args);
}

}