My assiment was to(please answer number 2 and 3):

1. Study the attached solution to PP. 10.9 (below is code for PP 10.9) on p. 535 of your text.

2. Create an application that draws the graph of the equation y=mx. This is the graph of a straight line where m is the slope of the line. Allow m to be set to values between -5 and +5 using a horizontal slider.

3. Next create two sliders, one that is horizontal and will move a horizontal line up and down and one that is vertical and will move a vertical line left and right, The resulting output should look lke this:

PP 10.9 code:

//******************************************************************** // Equation.java Authors: Lewis/Loftus // // Solution to Programming Project 10.9 //********************************************************************

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

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

//******************************************************************** // EquationGraph.java Author: Lewis/Loftus // // Solution to Programming Project 10.9 //********************************************************************

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); } }

//********************************************************************

// EquationGraphPanel.java Authors: Lewis/Loftus

//

// Solution to Programming Project 10.9

//********************************************************************

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("ax\u00B2 + 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();

}

}

}

//******************************************************************** // EquationViewportPanel.java Authors: Lewis/Loftus // // Solution to Programming Project 10.9 //********************************************************************

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

// 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