cs1.android

Class Shape

java.lang.Object

cs1.android.Shape

Direct Known Subclasses:

Circle, Image, Line, Point, Rectangle, Square, Text, Triangle

public abstract class Shape
extends java.lang.Object

Representation of a generic shape drawn on the canvas.

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	DEFAULT_COLOR The default color of a shape.

Constructor Summary

Constructors

Constructor and Description
Shape() Creates a shape of default color and no label

Method Summary

Methods

Modifier and Type	Method and Description
abstract boolean	contains(Point point) Determines if this shape contains the given point.
static double	distance_squared(Shape s1, Shape s2) Computes the squared distance between the given shapes.
static double	distance(Shape s1, Shape s2) Computes the distance between the given shapes.
void	draw() Draws this shape on the canvas.
abstract void	draw(android.graphics.Canvas canvas) Draws this shape on the given canvas.
void	erase() Removes this shape from the canvas.
abstract Point	getCenter() Returns the center of this shape.
int	getColor() Returns the color of this shape.
java.lang.String	getLabel() Returns the label associated with this shape.
abstract void	move(double dx, double dy) Moves this shape by the given displacement.
void	setColor(int c) Changes the color of this shape.
void	setColor(java.lang.String name) Changes the color of this shape.
void	setLabel(java.lang.String label) Changes the label of this shape.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

DEFAULT_COLOR

public static final java.lang.String DEFAULT_COLOR

The default color of a shape.

See Also:

Constant Field Values

Constructor Detail

Shape

public Shape()

Creates a shape of default color and no label

Method Detail

contains

public abstract boolean contains(Point point)

Determines if this shape contains the given point.

Parameters:

point - the point to check for containment

Returns:

true if this shape contains the given point

distance_squared

public static double distance_squared(Shape s1,
                      Shape s2)

Computes the squared distance between the given shapes.

Parameters:

s1 - the first shape

s2 - the second shape

Returns:

the squared distance between the given shapes

distance

public static double distance(Shape s1,
              Shape s2)

Computes the distance between the given shapes.

Parameters:

s1 - the first shape

s2 - the second shape

Returns:

the distance between the given shapes

draw

public void draw()

Draws this shape on the canvas.

draw

public abstract void draw(android.graphics.Canvas canvas)

Draws this shape on the given canvas. Should not be used directly.

Parameters:

canvas - the canvas in which to draw this shape

erase

public void erase()

Removes this shape from the canvas.

getCenter

public abstract Point getCenter()

Returns the center of this shape.

Returns:

the center of this shape

getColor

public int getColor()

Returns the color of this shape.

Returns:

the color of this shape

getLabel

public java.lang.String getLabel()

Returns the label associated with this shape.

Returns:

the label of this shape

move

public abstract void move(double dx,
        double dy)

Moves this shape by the given displacement.

Parameters:

dx - the displacement in x

dy - the displacement in y

setColor

public void setColor(int c)

Changes the color of this shape.

Parameters:

c - the value of the new color

setColor

public void setColor(java.lang.String name)

Changes the color of this shape.

Parameters:

name - the name of the new color

setLabel

public void setLabel(java.lang.String label)

Changes the label of this shape.

Parameters:

label - the new label