Class Point

java.lang.Object
  |
  +--Point

public class Point

extends Object

Point data structure

Field Summary

double	cost a double representing the cost of the this point
Point	ptr Pointer to anothor point

Constructor Summary

Point(double x, double y)
Constructs a new Point with the specified doubles as the x and y coordinates.

Method Summary

static double	distance(Point a, Point b) Computes the distance between two points
void	drawCircle(Graphics page, Color c, Rectangle rect, double size) Draws a circle at this Point.
static void	drawDottedLine(Graphics page, Color c, Rectangle rect, Point start, Point end, int n, int total) Draws a dotted line between the two specified points.
static void	drawPath(Point p, Point q, Graphics2D page, Color c, Rectangle rect) Draws a line between two points
static void	drawVertex(Point p, Graphics page, Color c, int size, Rectangle rect) Draws a point
static Point	midPoint(Point a, Point b) Gets the midpoint between two points.
static double	ScaleDistance(Point a, Point b, int width, int height) Scales the distance between two points according to the specified width and height.
static void	SetMaxes(double mx, double my) Sets the maximum y and x coordinates for all the points.
String	toString() Creates a string representation of a Point along with it's cost

Methods inherited from class java.lang.Object

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

Field Detail

cost

public double cost

a double representing the cost of the this point

ptr

public Point ptr

Pointer to anothor point

Constructor Detail

Point

public Point(double x,
             double y)

Constructs a new Point with the specified doubles as the x and y coordinates. The cost field is initialized to the max value for a double. The ptr field is null.

Parameters:

x - the x-coordinate of the Point

y - the y-coordinate of the Point

Method Detail

toString

public String toString()

Creates a string representation of a Point along with it's cost

Overrides:

toString in class Object

Returns:

a String, for example: "(0.567, 0.432) 0.999".

SetMaxes

public static void SetMaxes(double mx,
                            double my)

Sets the maximum y and x coordinates for all the points. Used to make sure Points used fit in a component when calling scaling and drawing methods. The default values are 1.0.

Parameters:

mx - maximum x-coordinate

my - maximum y_coordinate

See Also:

ScaleDistance(Point, Point, int, int)

drawPath

public static void drawPath(Point p,
                            Point q,
                            Graphics2D page,
                            Color c,
                            Rectangle rect)

Draws a line between two points

Parameters:

p - first point

q - second point

page - used to paint on the component

c - color of the path

rect - a Rectangle that specifies the area that the component spans

See Also:

drawVertex(Point, java.awt.Graphics, java.awt.Color, int, java.awt.Rectangle)

drawDottedLine

public static void drawDottedLine(Graphics page,
                                  Color c,
                                  Rectangle rect,
                                  Point start,
                                  Point end,
                                  int n,
                                  int total)

Draws a dotted line between the two specified points.

Parameters:

page - used to paint on the component

c - color of the circle

rect - a Rectangle that specifies the area that the component spans

start - point that the dotted line starts at

end - point that the dotted line starts at

n - how many of the dotted lines to draw out of the total

total - total number of dotted lines between the two points

See Also:

drawCircle(java.awt.Graphics, java.awt.Color, java.awt.Rectangle, double)

drawVertex

public static void drawVertex(Point p,
                              Graphics page,
                              Color c,
                              int size,
                              Rectangle rect)

Draws a point

Parameters:

p - point to be drawn

page - used to paint on the component

c - color of the point

size - the size of the point

rect - a Rectangle that specifies the area that the component spans

See Also:

drawPath(Point, Point, java.awt.Graphics2D, java.awt.Color, java.awt.Rectangle)

ScaleDistance

public static double ScaleDistance(Point a,
                                   Point b,
                                   int width,
                                   int height)

Scales the distance between two points according to the specified width and height.

Parameters:

a - first point

b - second point

width - the width to be scaled by

height - the height to be scaled by

Returns:

a double for the scaled distance

See Also:

distance(Point, Point), Visualization.drawCircle(java.awt.Graphics, java.awt.Color, java.awt.Rectangle, Point, double)

drawCircle

public void drawCircle(Graphics page,
                       Color c,
                       Rectangle rect,
                       double size)

Draws a circle at this Point.

Parameters:

page - used to paint on the component

c - color of the circle

rect - a Rectangle that specifies the area that the component spans

size - the diameter of the circle

See Also:

drawDottedLine(java.awt.Graphics, java.awt.Color, java.awt.Rectangle, Point, Point, int, int)

distance

public static double distance(Point a,
                              Point b)

Computes the distance between two points

Parameters:

a - first point

b - second point

Returns:

a double for the distance

See Also:

ScaleDistance(Point, Point, int, int)

midPoint

public static Point midPoint(Point a,
                             Point b)

Gets the midpoint between two points.

Parameters:

a - first point

b - second point

Returns:

a point as the midpoint