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JAVA QUESTION: Please modify the following code. The following code currently pr

ID: 3907626 • Letter: J

Question

JAVA QUESTION: Please modify the following code.

The following code currently produces the following output (see picture). Can someone please edit this code so that the ax^2 slider is completely gone? Instead, can someone remove the ability to use and see the a-slider or ax^2 so instead this graph is no longer ax^2+bx+c but instead bx+c? I've worked on this for a while and tried to do it by removing several things from the code but it produces many errors so I really need help. If you can, can you also put comments as to what you did to make the graph instead bx+c?

Thank you!!!!!!!

CODES TO MODIFY:

import javax.swing.*;

public class EquationGraph
{
   //-----------------------------------------------------------------
   // Creates and presents the program frame.
   //-----------------------------------------------------------------
   public static void main(String[] args)
   {
JFrame frame = new JFrame("Equation Graph");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(new EquationGraphPanel());
frame.pack();
frame.setVisible(true);
   }
}

-------

import java.awt.*;
import javax.swing.JPanel;
import javax.swing.border.LineBorder;

public class EquationViewportPanel extends JPanel
{
   private final int X_MIN = -10, Y_MIN = -10, X_MAX = 10, Y_MAX = 10;
   private final int REAL_WORLD_WIDTH = X_MAX - X_MIN;
   private final int REAL_WORLD_HEIGHT = Y_MAX - Y_MIN;
   private final double TICK_LENGTH = 0.2;

   private Equation equation;

   //-----------------------------------------------------------------
   // Constructor: Sets up this panel.
   //-----------------------------------------------------------------
   public EquationViewportPanel()
   {
equation = new Equation();
setBorder(new LineBorder(Color.black, 4));
setPreferredSize(new Dimension(500, 500));
   }

   //-----------------------------------------------------------------
   // Sets the equation.
   //-----------------------------------------------------------------
   void setEquation(Equation newEquation)
   {
equation = newEquation;
   }

   //-----------------------------------------------------------------
   // Converts world X coordinate to screen X coordinate.
   //-----------------------------------------------------------------
   private int convertX(double x)
   {
double offset = x - X_MIN;
double result = offset * getSize().width / REAL_WORLD_WIDTH;
return (int) Math.round(result);
   }

   //-----------------------------------------------------------------
   // Converts world Y coordinate to screen Y coordinate.
   //-----------------------------------------------------------------
   private int convertY(double y)
   {
double offset = Y_MAX - y;
double result = offset * getSize().height / REAL_WORLD_HEIGHT;
return (int) Math.round(result);
   }

   //-----------------------------------------------------------------
   // Draws a line in world coordinates on the screen.
   //-----------------------------------------------------------------
   private void drawScreenLine(Graphics page, double xMin, double yMin,
double xMax, double yMax)
   {
page.drawLine(convertX(xMin), convertY(yMin), convertX(xMax), convertY(yMax));
   }

   //-----------------------------------------------------------------
   // Draws a point in world coordinates on the screen.
   //-----------------------------------------------------------------
   private void drawScreenPoint(Graphics page, double x, double y)
   {
page.drawLine(convertX(x), convertY(y), convertX(x), convertY(y));
   }

   //-----------------------------------------------------------------
   // Draws the graph axes and equation.
   //-----------------------------------------------------------------
   public void paintComponent(Graphics page)
   {
page.setColor(Color.white);
page.fillRect(0,0,getSize().width, getSize().height);

// draw the x and y axis
page.setColor(Color.pink);
drawScreenLine(page, X_MIN, 0, X_MAX, 0);
drawScreenLine(page, 0, Y_MIN, 0, Y_MAX);

// draw tick marks
for (int x=X_MIN; x<X_MAX; x++)
   drawScreenLine(page, x, -TICK_LENGTH, x, TICK_LENGTH);
for (int y=Y_MIN; y<Y_MAX; y++)
   drawScreenLine(page, -TICK_LENGTH, y, TICK_LENGTH, y);

// draw the graph of the equation
page.setColor(Color.black);
double x = X_MIN;
double y;
double stepSize = (double)(X_MAX - X_MIN) / getSize().width;
int screenX = getSize().width;
for (int i = 0; i <= screenX; i++)
{
   y = equation.computeValue(x);
   drawScreenPoint(page, x, y);
   x += stepSize;
}
   }
}
---------

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.LineBorder;

public class EquationGraphPanel extends JPanel
{
   private JSlider aSlider;
   private JSlider bSlider;
   private JSlider cSlider;
   private EquationViewportPanel display;
   private JLabel equationLabel;

   private final String EQUATION_SUBSTRING = "Graph of equation y = ";

   private final int MIN_VALUE = -5;
   private final int MAX_VALUE = 5;
   private final int INIT_VALUE = 0;
   private final int TICK_SPACING = 5;
   private final int MINOR_TICK_SPACING = 1;

   //-----------------------------------------------------------------
   // Sets up the panel.
   //-----------------------------------------------------------------
   public EquationGraphPanel()
   {
setLayout(new BorderLayout());

add(getSliderPanel(), BorderLayout.WEST);


display = new EquationViewportPanel();
add(display, BorderLayout.CENTER);

equationLabel = new JLabel(EQUATION_SUBSTRING + 0);
equationLabel.setHorizontalAlignment(SwingConstants.CENTER);
equationLabel.setFont(new Font("Dialog", Font.BOLD, 16));
add(equationLabel, BorderLayout.NORTH);
   }

   //-----------------------------------------------------------------
   // Creates the sliders and slider panel.
   //-------------------------------------------------------------
   private JPanel getSliderPanel()
   {
SliderMouseListener changed = new SliderMouseListener();

aSlider = new JSlider(JSlider.HORIZONTAL, MIN_VALUE, MAX_VALUE, INIT_VALUE);
aSlider.setPaintTicks(true);
aSlider.setPaintLabels(true);
aSlider.setMajorTickSpacing(TICK_SPACING);
aSlider.setMinorTickSpacing(MINOR_TICK_SPACING);
aSlider.setSnapToTicks(true);
aSlider.addMouseListener(changed);

bSlider = new JSlider(JSlider.HORIZONTAL, MIN_VALUE, MAX_VALUE, INIT_VALUE);
bSlider.setPaintTicks(true);
bSlider.setPaintLabels(true);
bSlider.setMajorTickSpacing(TICK_SPACING);
bSlider.setMinorTickSpacing(MINOR_TICK_SPACING);
bSlider.setSnapToTicks(true);
bSlider.addMouseListener(changed);

cSlider = new JSlider(JSlider.HORIZONTAL, MIN_VALUE, MAX_VALUE, INIT_VALUE);
cSlider.setPaintTicks(true);
cSlider.setPaintLabels(true);
cSlider.setMajorTickSpacing(TICK_SPACING);
cSlider.setMinorTickSpacing(MINOR_TICK_SPACING);
cSlider.setSnapToTicks(true);
cSlider.addMouseListener(changed);

JPanel aPanel = new JPanel();
aPanel.setLayout(new BoxLayout(aPanel, BoxLayout.Y_AXIS));
aPanel.setBorder(new LineBorder(Color.black));
aPanel.add(new JLabel("value of 'a'"));
aPanel.add(aSlider);

JPanel bPanel = new JPanel();
bPanel.setLayout(new BoxLayout(bPanel, BoxLayout.Y_AXIS));
bPanel.setBorder(new LineBorder(Color.black));
bPanel.add(new JLabel("value of 'b'"));
bPanel.add(bSlider);

JPanel cPanel = new JPanel();
cPanel.setLayout(new BoxLayout(cPanel, BoxLayout.Y_AXIS));
cPanel.setBorder(new LineBorder(Color.black));
cPanel.add(new JLabel("value of 'c'"));
cPanel.add(cSlider);

JPanel sliderPanel = new JPanel();
sliderPanel.setLayout(new BoxLayout(sliderPanel, BoxLayout.Y_AXIS));
JLabel title = new JLabel("axu00B2 + bx + c");
title.setFont(new Font("Dialog", Font.BOLD, 16));
title.setHorizontalAlignment(SwingConstants.CENTER);
sliderPanel.add(title);
sliderPanel.add(new JLabel("Select values for each coefficient:"));
sliderPanel.add(Box.createVerticalGlue());
sliderPanel.add(aPanel);
sliderPanel.add(Box.createVerticalGlue());
sliderPanel.add(bPanel);
sliderPanel.add(Box.createVerticalGlue());
sliderPanel.add(cPanel);

return sliderPanel;
   }

   //-----------------------------------------------------------------
   // Update and equation label.
   //-------------------------------------------------------------
   private void updateEquationLabel (Equation equation)
   {
equationLabel.setText (EQUATION_SUBSTRING + equation.toString());
   }

   //********************************************************************
   // Represents the mouse listener class for the sliders.
   //********************************************************************
   private class SliderMouseListener extends MouseAdapter
   {
//-----------------------------------------------------------------
// Redraws the graph.
//-----------------------------------------------------------------
public void mouseReleased(MouseEvent event)
{
   Equation equation = new Equation(aSlider.getValue(),
   bSlider.getValue(), cSlider.getValue());
   display.setEquation(equation);
   updateEquationLabel(equation);
   repaint();
}
   }
}

-------

public class Equation
{
   private int a, b, c;
   public final String SQUARED = "u00B2";

   //------------------------------------------------------------------
   // Sets up the default coeficients of this equation:
   // a*x^2 + b*x + c
   //------------------------------------------------------------------
   public Equation()
   {
a = b = c = 0;
   }

   //------------------------------------------------------------------
   // Sets up the coeficients of this equation as specified.
   //------------------------------------------------------------------
   public Equation (int aValue, int bValue, int cValue)
   {
a = aValue;
b = bValue;
c = cValue;
   }

   //------------------------------------------------------------------
   // Computes the current value of this equation.
   //------------------------------------------------------------------
   public double computeValue(double x)
   {
return a*x*x + b*x + c;
   }

   //------------------------------------------------------------------
   // Returns a string representation of this equation.
   //------------------------------------------------------------------
   public String toString()
   {
StringBuffer equation = new StringBuffer();

if (a==0 && b==0 && c==0)
   equation.append("0");
else
{
   if (a != 0)
   {
if (a==-1)
   equation.append("-");
else
   if (a!=1)
equation.append(a);
equation.append( "x" + SQUARED);
   }
   if (b != 0)
   {
if (b < 0)
{
   if (a==0)
equation.append("-");
   else
equation.append(" - ");
   b = -b;
}
else
   equation.append(" + ");
if (b!=1 && b!= -1)
   equation.append(b);
equation.append("x");
   }
   if (c != 0)
   {
if (c < 0)
{
   if (a!=0 || b!=0)
equation.append(" - ");
   else
equation.append("-");
   c = c;
}
else
   equation.append(" + ");
equation.append(c);
   }
}

// erase leading +
if (equation.length() > 2)
{
   char ch = equation.charAt(1);
   if (ch=='+')
   {
   equation.deleteCharAt(0);
   equation.deleteCharAt(0);
   }
}
return equation.toString();
   }
}

Graph of equation y = 0 ax2 + bx c Select values for each coefficient value of 'a' -5 value of 'b' -5 value of 'c' -5

Explanation / Answer

here is your modified code : ----------->>>>>>>>>>>

public class Equation
{
private int b, c;//removed a
public final String SQUARED = "u00B2";
/*
   //------------------------------------------------------------------
   // Sets up the default coeficients of this equation:
   // a*x^2 + b*x + c
   //------------------------------------------------------------------
   */public Equation(){
  b = c = 0;//removed a
}
/*
   //------------------------------------------------------------------
   // Sets up the coeficients of this equation as specified.
   //------------------------------------------------------------------
   */public Equation (int bValue, int cValue){
  //removed a = aValue
  b = bValue;
  c = cValue;
}
/*
   //------------------------------------------------------------------
   // Computes the current value of this equation.
   //------------------------------------------------------------------
   */public double computeValue(double x){
  return /*a*x*x + remove this comment*/b*x + c;
}
/*
   //------------------------------------------------------------------
   // Returns a string representation of this equation.
   //------------------------------------------------------------------
   */public String toString(){
  StringBuffer equation = new StringBuffer();
  if(/*a==0 && remove this*/b==0 && c==0)
   equation.append("0");
  else{
   /*if (a != 0)
   {
if (a==-1)
   equation.append("-");
else
   if (a!=1)
equation.append(a);
equation.append( "x" + SQUARED);
   } remove this */
   if (b != 0){
    if (b < 0){
     /*remove this
     if(a==0)
      equation.append("-");
     else
      equation.append(" - ");

     b = -b;
     */
     equation.append("-");//add this
    }
    else
     equation.append(" + ");
    if (b!=1 && b!= -1)
     equation.append(b);
    equation.append("x");
   }
   if (c != 0){
    if (c < 0){
     if(/*a!=0 || remove*/b!=0)
      equation.append(" - ");
     else
      equation.append("-");
     c = c;
    }
    else
     equation.append(" + ");
    equation.append(c);
   }
  }
  // erase leading +
  if (equation.length() > 2){
   char ch = equation.charAt(1);
   if (ch=='+'){
    equation.deleteCharAt(0);
    equation.deleteCharAt(0);
   }
  }
  // erase leading -
  if (equation.length() > 2){
   char ch = equation.charAt(1);
   if (ch=='-'){
    equation.deleteCharAt(0);
    equation.deleteCharAt(0);
   }
  }
  return equation.toString();
}
}

------------------------------------------------------

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.LineBorder;

public class EquationGraphPanel extends JPanel
{
//private JSlider aSlider;remove this
private JSlider bSlider;
private JSlider cSlider;
private EquationViewportPanel display;
private JLabel equationLabel;

private final String EQUATION_SUBSTRING = "Graph of equation y = ";

private final int MIN_VALUE = -5;
private final int MAX_VALUE = 5;
private final int INIT_VALUE = 0;
private final int TICK_SPACING = 5;
private final int MINOR_TICK_SPACING = 1;
/*
   //-----------------------------------------------------------------
   // Sets up the panel.
   //-----------------------------------------------------------------
   */public EquationGraphPanel(){
  setLayout(new BorderLayout());
  add(getSliderPanel(), BorderLayout.WEST);

  display = new EquationViewportPanel();
  add(display, BorderLayout.CENTER);

  equationLabel = new JLabel(EQUATION_SUBSTRING + 0);
  equationLabel.setHorizontalAlignment(SwingConstants.CENTER);
  equationLabel.setFont(new Font("Dialog", Font.BOLD, 16));
  add(equationLabel, BorderLayout.NORTH);
}
/*
   //-----------------------------------------------------------------
   // Creates the sliders and slider panel.
   //-------------------------------------------------------------
   */private JPanel getSliderPanel(){
  SliderMouseListener changed = new SliderMouseListener();
/*remove this
aSlider = new JSlider(JSlider.HORIZONTAL, MIN_VALUE, MAX_VALUE, INIT_VALUE);
aSlider.setPaintTicks(true);
aSlider.setPaintLabels(true);
aSlider.setMajorTickSpacing(TICK_SPACING);
aSlider.setMinorTickSpacing(MINOR_TICK_SPACING);
aSlider.setSnapToTicks(true);
aSlider.addMouseListener(changed);
*/
  bSlider = new JSlider(JSlider.HORIZONTAL, MIN_VALUE, MAX_VALUE, INIT_VALUE);
  bSlider.setPaintTicks(true);
  bSlider.setPaintLabels(true);
  bSlider.setMajorTickSpacing(TICK_SPACING);
  bSlider.setMinorTickSpacing(MINOR_TICK_SPACING);
  bSlider.setSnapToTicks(true);
  bSlider.addMouseListener(changed);

  cSlider = new JSlider(JSlider.HORIZONTAL, MIN_VALUE, MAX_VALUE, INIT_VALUE);
  cSlider.setPaintTicks(true);
  cSlider.setPaintLabels(true);
  cSlider.setMajorTickSpacing(TICK_SPACING);
  cSlider.setMinorTickSpacing(MINOR_TICK_SPACING);
  cSlider.setSnapToTicks(true);
  cSlider.addMouseListener(changed);

  /*remove this
  JPanel aPanel = new JPanel();
  aPanel.setLayout(new BoxLayout(aPanel, BoxLayout.Y_AXIS));
  aPanel.setBorder(new LineBorder(Color.black));
  aPanel.add(new JLabel("value of 'a'"));
  aPanel.add(aSlider);
*/
  JPanel bPanel = new JPanel();
  bPanel.setLayout(new BoxLayout(bPanel, BoxLayout.Y_AXIS));
  bPanel.setBorder(new LineBorder(Color.black));
  bPanel.add(new JLabel("value of 'b'"));
  bPanel.add(bSlider);

  JPanel cPanel = new JPanel();
  cPanel.setLayout(new BoxLayout(cPanel, BoxLayout.Y_AXIS));
  cPanel.setBorder(new LineBorder(Color.black));
  cPanel.add(new JLabel("value of 'c'"));
  cPanel.add(cSlider);

  JPanel sliderPanel = new JPanel();
  sliderPanel.setLayout(new BoxLayout(sliderPanel, BoxLayout.Y_AXIS));
  JLabel title = new JLabel(/*"axu00B2 + remove this*/"bx + c");
  title.setFont(new Font("Dialog", Font.BOLD, 16));
  title.setHorizontalAlignment(SwingConstants.CENTER);
  sliderPanel.add(title);
  sliderPanel.add(new JLabel("Select values for each coefficient:"));
  /*sliderPanel.add(Box.createVerticalGlue());
  sliderPanel.add(aPanel);Remove this */
  sliderPanel.add(Box.createVerticalGlue());
  sliderPanel.add(bPanel);
  sliderPanel.add(Box.createVerticalGlue());
  sliderPanel.add(cPanel);
  return sliderPanel;
}
/*
   //-----------------------------------------------------------------
   // Update and equation label.
   //-------------------------------------------------------------
   */private void updateEquationLabel (Equation equation){
  equationLabel.setText (EQUATION_SUBSTRING + equation.toString());
}
/*
   //********************************************************************
   // Represents the mouse listener class for the sliders.
   //********************************************************************
   */private class SliderMouseListener extends MouseAdapter{
//-----------------------------------------------------------------
// Redraws the graph.
//-----------------------------------------------------------------
  public void mouseReleased(MouseEvent event)
  {
   Equation equation = new Equation(/*aSlider.getValue(),remove this*/bSlider.getValue(), cSlider.getValue());
   display.setEquation(equation);
   updateEquationLabel(equation);
   repaint();
  }
}
}

---------------------------------------------

import java.awt.*;
import javax.swing.JPanel;
import javax.swing.border.LineBorder;

public class EquationViewportPanel extends JPanel{
private final int X_MIN = -10, Y_MIN = -10, X_MAX = 10, Y_MAX = 10;
private final int REAL_WORLD_WIDTH = X_MAX - X_MIN;
private final int REAL_WORLD_HEIGHT = Y_MAX - Y_MIN;
private final double TICK_LENGTH = 0.2;

private Equation equation;
/*
   //-----------------------------------------------------------------
   // Constructor: Sets up this panel.
   //-----------------------------------------------------------------
   */public EquationViewportPanel(){
  equation = new Equation();
  setBorder(new LineBorder(Color.black, 4));
  setPreferredSize(new Dimension(500, 500));
}
/*
   //-----------------------------------------------------------------
   // Sets the equation.
   //-----------------------------------------------------------------
   */void setEquation(Equation newEquation){
  equation = newEquation;
}
/*
   //-----------------------------------------------------------------
   // Converts world X coordinate to screen X coordinate.
   //-----------------------------------------------------------------
   */private int convertX(double x){
  double offset = x - X_MIN;
  double result = offset * getSize().width / REAL_WORLD_WIDTH;
  return (int) Math.round(result);
}
/*
   //-----------------------------------------------------------------
   // Converts world Y coordinate to screen Y coordinate.
   //-----------------------------------------------------------------
   */private int convertY(double y){
  double offset = Y_MAX - y;
  double result = offset * getSize().height / REAL_WORLD_HEIGHT;
  return (int) Math.round(result);
}
/*
   //-----------------------------------------------------------------
   // Draws a line in world coordinates on the screen.
   //-----------------------------------------------------------------
   */private void drawScreenLine(Graphics page, double xMin, double yMin,double xMax, double yMax){
  page.drawLine(convertX(xMin), convertY(yMin), convertX(xMax), convertY(yMax));
}
/*
   //-----------------------------------------------------------------
   // Draws a point in world coordinates on the screen.
   //-----------------------------------------------------------------
   */private void drawScreenPoint(Graphics page, double x, double y){
  page.drawLine(convertX(x), convertY(y), convertX(x), convertY(y));
}
/*
   //-----------------------------------------------------------------
   // Draws the graph axes and equation.
   //-----------------------------------------------------------------
   */public void paintComponent(Graphics page){
  page.setColor(Color.white);
  page.fillRect(0,0,getSize().width, getSize().height);

  // draw the x and y axis
  page.setColor(Color.pink);
  drawScreenLine(page, X_MIN, 0, X_MAX, 0);
  drawScreenLine(page, 0, Y_MIN, 0, Y_MAX);

  // draw tick marks
  for (int x=X_MIN; x<X_MAX; x++)
   drawScreenLine(page, x, -TICK_LENGTH, x, TICK_LENGTH);
  for (int y=Y_MIN; y<Y_MAX; y++)
   drawScreenLine(page, -TICK_LENGTH, y, TICK_LENGTH, y);

  // draw the graph of the equation
  page.setColor(Color.black);
  double x = X_MIN;
  double y;
  double stepSize = (double)(X_MAX - X_MIN) / getSize().width;
  int screenX = getSize().width;
  for (int i = 0; i <= screenX; i++){
   y = equation.computeValue(x);
   drawScreenPoint(page, x, y);
   x += stepSize;
  }
}
}

----------------------------------------

import javax.swing.*;

public class EquationGraph
{/*
   //-----------------------------------------------------------------
   // Creates and presents the program frame.
   //-----------------------------------------------------------------
   */public static void main(String[] args){
  JFrame frame = new JFrame("Equation Graph");
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  frame.getContentPane().add(new EquationGraphPanel());
  frame.pack();
  frame.setVisible(true);
}
}

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