Class PaymentCanvas

java.lang.Object
  |
  +--java.awt.Component
        |
        +--java.awt.Canvas
              |
              +--PaymentCanvas

class PaymentCanvas

extends java.awt.Canvas

implements java.awt.event.MouseMotionListener

See Also:

Serialized Form

Inner classes inherited from class java.awt.Component

java.awt.Component.AWTTreeLock

Field Summary

(package private) double	apr variable to display the APR(Annual Percentage Rate) in the textfield
(package private) java.awt.Graphics	g The graphics context of the instantiating applet
(package private) int	height varianle determines the height of the drawing canvas
(package private) java.awt.Image	imageObject contstuctor to create an image variable to create an image on the applet panel
(package private) java.awt.TextField	interestPaid textfield for Interest paid during the period
(package private) java.awt.TextField	mon textfield for months
(package private) double	monthlyPayment variable to display the monthly payment
(package private) java.awt.TextField	monthPay textfield for Monthly payment
(package private) int	months variable to input the number of months the mortgage is taken
(package private) java.awt.Checkbox	paidInterest Checkbox to select the type of graph for interest paid
(package private) java.awt.Checkbox	paidPrincipal Checkbox to select the type of graph for Principal paid
(package private) int	principal variable to display the principal amount on the applet textfield
(package private) java.awt.TextField	principalPaid textfield for Principal paid
(package private) java.awt.Checkbox	principalUnpaid Checkbox to select the type of graph for unpaid principal
(package private) java.awt.TextField	unpaidPrincipal textfield for unpaid Principal amount
(package private) int	width variable determines the width of the drawing canvas
(package private) int	xborder variable representing the x coordinate of the graph canvas
(package private) double	xincr variable to increment the loop value to draw the graph according to value changes
(package private) int	yborder variable representing the y coordinate of the graph canvas
(package private) int	years variable to display the number of years on the applet textfield

Fields inherited from class java.awt.Canvas

base, graphicsConfig, nameCounter, serialVersionUID

Fields inherited from class java.awt.Component

actionListenerK, adjustmentListenerK, appContext, assert, background, BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, changeSupport, componentListener, componentListenerK, componentOrientation, componentSerializedDataVersion, containerListenerK, cursor, dropTarget, enabled, eventMask, focusListener, focusListenerK, font, foreground, hasFocus, height, incRate, inputMethodListener, inputMethodListenerK, isInc, isPacked, itemListenerK, keyListener, keyListenerK, LEFT_ALIGNMENT, locale, LOCK, minSize, mouseListener, mouseListenerK, mouseMotionListener, mouseMotionListenerK, name, nameExplicitlySet, newEventsOnly, ownedWindowK, parent, peer, peerFont, popups, prefSize, RIGHT_ALIGNMENT, serialVersionUID, textListenerK, TOP_ALIGNMENT, valid, visible, width, windowListenerK, x, y

Constructor Summary

(package private)

PaymentCanvas()

Method Summary

(package private) void	draw()
(package private) double	interestPaid(int i) function to calculate the value of the interest paid to the period
void	mouseDragged(java.awt.event.MouseEvent e) This method is defined for the sake of convinience Basically this function is called when the mouse is moved by pressing left mouse button
void	mouseMoved(java.awt.event.MouseEvent e) This method is called when the mouse is moved over the graph panel this class implements MouseMotionListener, an abstract class
(package private) double	paidPrincipal(int i) function to calculate the value of the paid principal to the period
void	paint(java.awt.Graphics g) Paint method to paint the points again when the values are changed by the user
(package private) void	setParameters(java.awt.TextField loanAmount, java.awt.TextField numberYears, java.awt.TextField annualRate) function to set the parameters to their corresponding calculated values.
(package private) void	setup(java.awt.TextField unpaidPrincipal, java.awt.TextField principalPaid, java.awt.TextField interestPaid, java.awt.TextField monthPay, java.awt.TextField mon, java.awt.Checkbox paidPrincipal, java.awt.Checkbox paidInterest, java.awt.Checkbox principalUnpaid) function to set the self-referenced values of the textfields and the checkboxes on the applet panel.
(package private) double	totalPaid(int i) function to calculate the value of the total amount paid during the period the loan is borrowed
(package private) int	transform(double y, double top) function to transform the obtained calculated values into the data points on the graph
(package private) double	unpaidPrincipal(int i) function to calculate the value of the unpaid principle of the loan amount

Methods inherited from class java.awt.Canvas

, addNotify, constructComponentName, postsOldMouseEvents

Methods inherited from class java.awt.Component

action, add, addComponentListener, addFocusListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addPropertyChangeListener, addPropertyChangeListener, areInputMethodsEnabled, bounds, checkImage, checkImage, coalesceEvents, contains, contains, createImage, createImage, deliverEvent, disable, disableEvents, dispatchEvent, dispatchEventImpl, doLayout, enable, enable, enableEvents, enableInputMethods, eventEnabled, firePropertyChange, getAlignmentX, getAlignmentY, getBackground, getBounds, getBounds, getColorModel, getComponentAt, getComponentAt, getComponentOrientation, getCursor, getDropTarget, getFont_NoClientCode, getFont, getFontMetrics, getForeground, getGraphics, getHeight, getInputContext, getInputMethodRequests, getIntrinsicCursor, getLocale, getLocation, getLocation, getLocationOnScreen, getMaximumSize, getMinimumSize, getName, getNativeContainer, getParent_NoClientCode, getParent, getPeer, getPreferredSize, getSize, getSize, getToolkit, getToolkitImpl, getTreeLock, getWidth, getWindowForObject, getX, getY, gotFocus, handleEvent, hasFocus, hide, imageUpdate, initIDs, inside, invalidate, isDisplayable, isDoubleBuffered, isEnabled, isEnabledImpl, isFocusTraversable, isLightweight, isOpaque, isShowing, isValid, isVisible, keyDown, keyUp, layout, lightweightPrint, list, list, list, list, list, locate, location, lostFocus, minimumSize, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, paramString, postEvent, preferredSize, prepareImage, prepareImage, print, printAll, printHeavyweightComponents, processComponentEvent, processEvent, processFocusEvent, processInputMethodEvent, processKeyEvent, processMouseEvent, processMouseMotionEvent, readObject, remove, removeComponentListener, removeFocusListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeNotify, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, repaint, requestFocus, reshape, resize, resize, setBackground, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setEnabled, setFont, setForeground, setLocale, setLocation, setLocation, setName, setSize, setSize, setVisible, show, show, size, toString, transferFocus, update, validate, writeObject

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, registerNatives, wait, wait, wait

Field Detail

imageObject

java.awt.Image imageObject

contstuctor to create an image variable to create an image on the applet panel

g

java.awt.Graphics g

The graphics context of the instantiating applet

principal

int principal

variable to display the principal amount on the applet textfield

years

int years

variable to display the number of years on the applet textfield

xborder

int xborder

variable representing the x coordinate of the graph canvas

yborder

int yborder

variable representing the y coordinate of the graph canvas

width

int width

variable determines the width of the drawing canvas

height

int height

varianle determines the height of the drawing canvas

months

int months

variable to input the number of months the mortgage is taken

xincr

double xincr

variable to increment the loop value to draw the graph according to value changes

monthlyPayment

double monthlyPayment

variable to display the monthly payment

apr

double apr

variable to display the APR(Annual Percentage Rate) in the textfield

unpaidPrincipal

java.awt.TextField unpaidPrincipal

textfield for unpaid Principal amount

principalPaid

java.awt.TextField principalPaid

textfield for Principal paid

interestPaid

java.awt.TextField interestPaid

textfield for Interest paid during the period

monthPay

java.awt.TextField monthPay

textfield for Monthly payment

mon

java.awt.TextField mon

textfield for months

paidPrincipal

java.awt.Checkbox paidPrincipal

Checkbox to select the type of graph for Principal paid

paidInterest

java.awt.Checkbox paidInterest

Checkbox to select the type of graph for interest paid

principalUnpaid

java.awt.Checkbox principalUnpaid

Checkbox to select the type of graph for unpaid principal

Constructor Detail

PaymentCanvas

PaymentCanvas()

Method Detail

setup

void setup(java.awt.TextField unpaidPrincipal,
           java.awt.TextField principalPaid,
           java.awt.TextField interestPaid,
           java.awt.TextField monthPay,
           java.awt.TextField mon,
           java.awt.Checkbox paidPrincipal,
           java.awt.Checkbox paidInterest,
           java.awt.Checkbox principalUnpaid)

function to set the self-referenced values of the textfields and the checkboxes on the applet panel.

Parameters:

unpaidPrincipal - variable to display the unpaid principal amount

principalPaid - variable to display the paid principal amount

interestPaid - variable to display the interest paid to the date

monthPay - non-editable textfield variable to display the monthly payment

mon - non-editable textfield variable to display the number of months

paidPrincipal - checkbox variable to see the graph of principal paid during the period

paidInterest - checkbox variable to see the graph of interest paid during the period

principalUnpaid - checkbox variable to see the graph of unpaid principal during the period

setParameters

void setParameters(java.awt.TextField loanAmount,
                   java.awt.TextField numberYears,
                   java.awt.TextField annualRate)

function to set the parameters to their corresponding calculated values. This function first checks the input and convert it into specified format then catches the throwed exception and do the following action.

Parameters:

loanAmount - textfield to input the loan amount borrowed

numberYears - textfield to input the number of years for which the loan is borrowed

annualRate - textfield to input the annual percentage rate of the loan borrowed

unpaidPrincipal

double unpaidPrincipal(int i)

function to calculate the value of the unpaid principle of the loan amount

paidPrincipal

double paidPrincipal(int i)

function to calculate the value of the paid principal to the period

interestPaid

double interestPaid(int i)

function to calculate the value of the interest paid to the period

totalPaid

double totalPaid(int i)

function to calculate the value of the total amount paid during the period the loan is borrowed

transform

int transform(double y,
              double top)

function to transform the obtained calculated values into the data points on the graph

draw

void draw()

paint

public void paint(java.awt.Graphics g)

Paint method to paint the points again when the values are changed by the user

Overrides:

paint in class java.awt.Canvas

Parameters:

g - Graphics context of an applet

mouseDragged

public void mouseDragged(java.awt.event.MouseEvent e)

This method is defined for the sake of convinience Basically this function is called when the mouse is moved by pressing left mouse button

Specified by:

mouseDragged in interface java.awt.event.MouseMotionListener

Parameters:

e - MouseEvent object supplied by the system

mouseMoved

public void mouseMoved(java.awt.event.MouseEvent e)

This method is called when the mouse is moved over the graph panel this class implements MouseMotionListener, an abstract class

Specified by:

mouseMoved in interface java.awt.event.MouseMotionListener

Parameters:

e - MouseEvent object supplied by the system