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Assignment7 | Computer Science homework help

Requirements to get full credits in Documentation

1.A description of each method is also needed.

2.Some additional comments inside of methods to explain code that are hard to follow should be written.

You can look at the Java programs in the text book to see how comments are added to programs.

Minimal Submitted Files

You are required, but not limited, to turn in the following source files:

Assignment7.java (No need to be changed) 

DrawingPane.java —   to be completed.

You may add more classes or more methods than the specified ones. (You might need them.)

Skills to be Applied:


Classes may be needed:  

Button, ComboBox, Color, Graphics, Line, ActionHandler, MouseHandler. You may use other classes.

Here is Assignment7.java:


import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.layout.StackPane;

public class Assignment7 extends Application
  public void start(Stage primaryStage)
     //create a DrawPane object. See DrawPane.java for details.
     DrawingPane gui = new DrawingPane();
     //put gui on top of the rootPane
     StackPane rootPane = new StackPane();
     // Create a scene and place rootPane in the stage
     Scene scene = new Scene(rootPane, 600, 400);
     primaryStage.setTitle("Line Drawing");
     primaryStage.setScene(scene); // Place the scene in the stage
     primaryStage.show(); // Display the stage
  public static void main(String[] args)

Here is DrawingPane.java (This is a semi-finished product, you need to add):

//import any classes necessary here
import javafx.scene.control.Button;
import javafx.scene.control.ComboBox;
import javafx.scene.layout.Pane;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.scene.shape.Line;
import javafx.scene.paint.Color;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.geometry.Orientation;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.input.MouseEvent;

import java.util.ArrayList;

public class DrawingPane extends BorderPane
  private Button undoButton, eraseButton;
  private ComboBox<String> colorCombo, widthCombo;
  private ArrayList<Line> lineList;
  private Pane canvas;
  //declare any other necessary instance variables here

  public DrawingPane()
     //Step #1: initialize instance variable and set up layout
     undoButton = new Button("Undo");
     eraseButton = new Button("Erase");

     //Create the color comboBox and width comboBox,
     //initialize lineList, it is a data structure we used
     //to track the lines we created
     //topPane should contain two combo boxes and two buttons
     HBox topPane = new HBox();
     topPane.setPadding(new Insets(10, 10, 10, 10));
     topPane.setStyle("-fx-border-color: black");
      //canvas is a Pane where we will draw lines
     canvas = new Pane();
     canvas.setStyle("-fx-background-color: white;");

     //add the canvas at the center of the pane and top panel
     //should have two combo boxes and two buttons

     //Step #3: Register the source nodes with its handler objects
     canvas.setOnMousePressed(new MouseHandler());

   //Step #2(A) - MouseHandler
   private class MouseHandler implements EventHandler<MouseEvent>
       public void handle(MouseEvent event)
           //handle MouseEvent here
           //Note: you can use if(event.getEventType()== MouseEvent.MOUSE_PRESSED)
           //to check whether the mouse key is pressed, dragged or released
           //write your own codes here
       }//end handle()
   }//end MouseHandler

   //Step #2(B)- A handler class used to handle events from Undo & Erase buttons
   private class ButtonHandler implements EventHandler<ActionEvent>
       public void handle(ActionEvent event)
           //write your codes here
   }//end ButtonHandler

  //Step #2(C)- A handler class used to handle colors
  private class ColorHandler implements EventHandler<ActionEvent>
      public void handle(ActionEvent event)
          //write your own codes here
  }//end ColorHandler
   //Step #2(D)- A handler class used to handle widths of lines
   private class WidthHandler implements EventHandler<ActionEvent>
       public void handle(ActionEvent event)
           //write your own codes here
   }//end WidthHandler
}//end class DrawingPane

The remail details is in the picture file.

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