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Class graphing.GraphWindow

java.lang.Object
   |
   +----java.awt.Component
           |
           +----java.awt.Canvas
                   |
                   +----graphing.GraphWindow

public class GraphWindow
extends Canvas
implements Runnable

A GraphWindow is a Canvas for drawing the graphs of mathematical functions. A set of axes is described by the ranges xMin, xMax and yMin, yMax (with tickmarks spaced at intervals of xScale and yScale respectively on the x and y axes). Functions are added to the window with the addFunction() method and removed by deleteFunction

functionList: List of all the functions on the graph.
gridColor: Color of the optional grid
maxFunctions: The number of functions allowed in this window.
showGrid: Show a background grid if set
UNLIMITED: Constant value to allow any number of functions.
xAxisLabel: Label the axes with numbers if set
xMax: Right-hand endpoint of the graph
xMin: Left-hand endpoint of the graph
xScale: Spacing of the tickmarks on the x-axis
yAxisLabel: Label the axes with numbers if set
yMax: Top endpoint of the graph
yMin: Bottom endpoint of the graph
yScale: Spacing of the tickmarks on the y-axis

GraphWindow(): Make a GraphWindow with the default graphing range of -5...5 and -5...5
GraphWindow(double, double, double, double): Constructs a GraphWindow with the specified ranges of x and y axes.
GraphWindow(double, double, double, double, double, double): Constructs a GraphWindow with the specifies ranges of x and y axes.

addFunction(Function): Add a new Function to the list of functions being drawn, and draw it in the appropriate default color.
addFunction(Function, Color): Add a new Function to the list of functions being drawn, and draw it in the given Color.
deleteAll(): Empty the list of functions being drawn.
deleteFunction(Function): Remove the function from the list of functions being drawn.
deleteLastFunction(): Delate the last function to have been added from the list of functions being drawn.
drawGraph(): This method should be called whenever the graph needs to be redrawn from scratch (rather than simply refreshed).
drawGraph(double, double, double, double): Change the axes, set the scale to zero (ie no tickmarks), and redraw from scratch.
drawGraph(double, double, double, double, double, double): Change the axes and scales and redraw the graph from scratch.
paint(Graphics)
run(): The thread that actually draws the graph
x(double): Convert x-values to pixels.
x(int): Convert pixels to an x-value.
xMax(): Returns the value of xMax
xMin(): Returns the value of xMin
xScale(): Returns the value of xScale
y(double): Convert y-values to pixels.
y(int): Convert pixels to y-values.
yMax(): Returns the value of yMax
yMin(): Returns the value of yMin
yScale(): Returns the value of yScale

xMin

  protected double xMin

Left-hand endpoint of the graph

xMax

  protected double xMax

Right-hand endpoint of the graph

xScale

  protected double xScale

Spacing of the tickmarks on the x-axis

yMin

  protected double yMin

Bottom endpoint of the graph

yMax

  protected double yMax

Top endpoint of the graph

yScale

  protected double yScale

Spacing of the tickmarks on the y-axis

gridColor

  protected Color gridColor

Color of the optional grid

xAxisLabel

  protected boolean xAxisLabel

Label the axes with numbers if set

yAxisLabel

  protected boolean yAxisLabel

Label the axes with numbers if set

showGrid

  protected boolean showGrid

Show a background grid if set

functionList

  protected Vector functionList

List of all the functions on the graph.

UNLIMITED

  public final static int UNLIMITED

Constant value to allow any number of functions.

maxFunctions

  public int maxFunctions

The number of functions allowed in this window.

GraphWindow

  public GraphWindow(double xMin,
                     double xMax,
                     double yMin,
                     double yMax)

Constructs a GraphWindow with the specified ranges of x and y axes. The axes show no tickmarks.

GraphWindow

  public GraphWindow(double xMin,
                     double xMax,
                     double xScale,
                     double yMin,
                     double yMax,
                     double yScale)

Constructs a GraphWindow with the specifies ranges of x and y axes. The axes show tickmarks marked out at intervals of xScale and yScale.

GraphWindow

  public GraphWindow()

Make a GraphWindow with the default graphing range of -5...5 and -5...5

drawGraph

  public void drawGraph()

This method should be called whenever the graph needs to be redrawn from scratch (rather than simply refreshed).

drawGraph

  public void drawGraph(double xMin,
                        double xMax,
                        double xScale,
                        double yMin,
                        double yMax,
                        double yScale)

Change the axes and scales and redraw the graph from scratch.

drawGraph

  public void drawGraph(double xMin,
                        double xMax,
                        double yMin,
                        double yMax)

Change the axes, set the scale to zero (ie no tickmarks), and redraw from scratch.

addFunction

  public void addFunction(Function f,
                          Color c)

Add a new Function to the list of functions being drawn, and draw it in the given Color.

addFunction

  public void addFunction(Function f)

Add a new Function to the list of functions being drawn, and draw it in the appropriate default color.

deleteFunction

  public void deleteFunction(Function f)

Remove the function from the list of functions being drawn.

deleteLastFunction

  public void deleteLastFunction()

Delate the last function to have been added from the list of functions being drawn.

deleteAll

  public void deleteAll()

Empty the list of functions being drawn.

xMin

  public double xMin()

Returns the value of xMin

xMax

  public double xMax()

Returns the value of xMax

xScale

  public double xScale()

Returns the value of xScale

yMin

  public double yMin()

Returns the value of yMin

yMax

  public double yMax()

Returns the value of yMax

yScale

  public double yScale()

Returns the value of yScale

  public int x(double xValue)

Convert x-values to pixels. Convert a double (presumed in the range xMin to xMax) to the corresponding x coordinate in the current graphics context.

  public double x(int xCoord)

Convert pixels to an x-value. Convert an integer x coordinate (in the current graphics context) to the corresponding double in the range xMin to xMax.

  public int y(double yValue)

Convert y-values to pixels. Convert a double (presumed in the range yMin to yMax) to the corresponding y coordinate in the current graphics context.

  public double y(int yCoord)

Convert pixels to y-values. Convert an integer y coordinate (in the current graphics context) to the corresponding double in the range yMin to yMax.

paint

  public void paint(Graphics g)

Overrides:: paint in class Canvas

run

  public void run()

The thread that actually draws the graph

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