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Class objects.EuObject

java.lang.Object
   |
   +----objects.EuObject

public abstract class EuObject

extends Object

implements constants, Cloneable

sameAs

The

status

The status of the object, determining how it appears in the

warner

EuObject()

atParameter(double)

Returns the cartesian coordinates at the parameter in the internal representation of the object.

atParameter(EuReal)

Returns the cartesian coordinates at the parameter in the internal representation of the object

blankoutInvisible(Graphics, mouseInfo)

If the object is marked

castIdentical(EuObject)

Determines whether or not another object is derived from the same full object of th epresent one, i.e.

cloneObject()

closureContains(EuVector)

Determines whether or not a given point is contained in the closure of the present object (up to a small error,

draw(Graphics, mouseInfo)

Draw the object to a Graphics canvas.

drawFlash(Graphics, mouseInfo, boolean)

If the object is or was flashing, draw it to a Graphics canvas, using the color indicated by

drawVisible(Graphics, mouseInfo)

If the object is marked

equals(EuObject)

Compares EuObjects in a mathematical sense: returns true if they are equal up to a reasonable error (

interiorContains(EuVector)

Determines whether or not a given point is contained in the interior the present object (up to a small error,

isFull()

mouseVicinity(mouseVector, mouseInfo)

Determines whether or not the mouse is close (in a sense determined in

myFullShadow()

Returns the

overlaps(EuObject)

Determines whether or not another object overlaps nontrivially with the present one, i.e.

setColors(int, int)

A method for setting the color of the object as it appears on screen.

setShadow(int)

Sets the

setStatus(int)

A method for setting the status of the object

setWarner(EuWarner)

Pass a

startFlash()

Indicate that the objects should be flashed.

subType()

Overridden to return one of the constants A_RADIUS, A_POINT, A_LINE, A_HALF, AN_INTERVAL, A_CIRCLE, AN_ARC from the

type()

Overridden to return one of the constants RADIUS, POINT, LINE, CIRCLE from the

 public int status

The status of the object, determining how it appears in the @see EuLab window, and its accessibility by mouse.

 public int sameAs

The @see EuLab number of another object, identical to the present one, in the same @see EuLab, or -1 if there is no such object. The first instance points to the second. All other point back to the first.

 protected static EuWarner warner

 public EuObject()

 public void startFlash()

Indicate that the objects should be flashed. Only takes effect on screen after a drawFlash() command.

 public void setWarner(EuWarner warner)

Pass a @see EuWarner to all objects. As the warner is stored in a static variable, one warner is being shared by all objects.

Parameters:

warner - The @see EuWarner

 public void setColors(int normal,
                       int flash)

A method for setting the color of the object as it appears on screen.

Parameters:

normal - the standard color of this object

flash - the color used to flash this object

 public void setStatus(int status)

A method for setting the status of the object

Parameters:

status - the required status

 public boolean equals(EuObject other)

Compares EuObjects in a mathematical sense: returns true if they are equal up to a reasonable error (@see EuReal). Overrides Object method. Warning: This is not truly an equivalence relation! It will be reflexive and symmetric, but could fail to be transitive for roundoff error reasons.

Parameters:

other - the other EuObject

 public abstract EuWorkVector atParameter(double t)

Returns the cartesian coordinates at the parameter in the internal representation of the object.

Parameters:

t - the parameter

Returns:

a workVector containing the coordinates

 public EuWorkVector atParameter(EuReal t)

Returns the cartesian coordinates at the parameter in the internal representation of the object

Parameters:

t - the parameter

Returns:

a workVector containing the coordinates

 public void drawVisible(Graphics g,
                         mouseInfo info)

If the object is marked @see VISIBLE, or if it is flashing, draw it to a Graphics canvas, using the color indicated by @see color or @see flashcolor.

Parameters:

g - the Graphics handle on the window

info - information used in scaling and positioning the object

 public void drawFlash(Graphics g,
                       mouseInfo info,
                       boolean endFlash)

If the object is or was flashing, draw it to a Graphics canvas, using the color indicated by @see color or @see flashcolor.

Parameters:

g - the Graphics handle on the window

info - information used in scaling and positioning the object

endFlash - if true, stop flashing and draw in normal color.

 public void blankoutInvisible(Graphics g,
                               mouseInfo info)

If the object is marked @see HIDDEN or @see HIDDENTARGET, and it is not flashing, draw it to a Graphics canvas in the @see INVISIBLE color, effectively blanking it out from the canvas.

Parameters:

g - the Graphics handle on the window

info - information used in scaling and positioning the object

 public abstract void draw(Graphics g,
                           mouseInfo info)

Draw the object to a Graphics canvas. The color must be set in advance.

Parameters:

g - the Graphics handle on the window

info - information used in scaling and positioning the object

 public abstract boolean mouseVicinity(mouseVector mouseAt,
                                       mouseInfo info)

Determines whether or not the mouse is close (in a sense determined in @see mouseVector) to the object's representation on screen.

Parameters:

mouseAt - The coordinates of the mouse position

info - information used in locating the object on screen

Returns:

true if the mouse is close

 public abstract boolean castIdentical(EuObject other)

Determines whether or not another object is derived from the same full object of th epresent one, i.e. whether they are equal (up to a small error, @see EuReal) in themselves, or possibly just after being cast to full circles or full lines

Parameters:

other - the object being compared to the present one

Returns:

true if they are equal

 public abstract boolean interiorContains(EuVector point)

Determines whether or not a given point is contained in the interior the present object (up to a small error, @see EuReal).

Parameters:

point - the point being compared to the present object

Returns:

true if the point is contained

 public abstract boolean closureContains(EuVector point)

Determines whether or not a given point is contained in the closure of the present object (up to a small error, @see EuReal).

Parameters:

point - the point being compared to the present object

Returns:

true if the point is contained

 public abstract boolean overlaps(EuObject other)

Determines whether or not another object overlaps nontrivially with the present one, i.e. whether they have an intersection (up to a small error, @see EuReal) with infinitely many points.

Parameters:

other - the object being compared to the present one

Returns:

true if they have an overlap

 public int type()

Overridden to return one of the constants RADIUS, POINT, LINE, CIRCLE from the @see constants interface

 public int subType()

Overridden to return one of the constants A_RADIUS, A_POINT, A_LINE, A_HALF, AN_INTERVAL, A_CIRCLE, AN_ARC from the @see constants interface

 public abstract int myFullShadow()

Returns the @see EuLab number of the full object behind the present one, or -1 if no such object exists. The full objects always return -1.

Returns:

-1 or a EuLab index.

 public abstract void setShadow(int i)

Sets the @see EuLab number of the full object behind the present one,

Returns:

i the EuLab index.

 public EuObject cloneObject()

 public boolean isFull()

Returns:

true if the item is of subtype A_RADIUS, A_POINT, A_LINE, A_CIRCLE

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