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Class objects.EuLine

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

public class EuLine

extends EuPoint

generator

A generating vector of the line.

EuLine(double, double, double, double)

The constructor does initialization.

atParameter(double)

Return in a

castIdentical(EuObject)

See if passed object can be cast to the present one.

closestParameter(double, double)

Find the parameter value which yields the closest point to a given one.

closestParameter(EuVector)

closureContains(EuVector)

See if passed point lies on the line.

draw(Graphics, mouseInfo)

Draw the line, using the

drawTheLine(Graphics, mouseVector, mouseVector)

interiorContains(EuVector)

See if passed point lies on the line.

matchingPair(EuVector, EuVector, EuVector, EuVector)

MouseVicinity(mouseVector, mouseInfo)

See if mouse position is close to this line.

myFullShadow()

overlaps(EuObject)

Acts identically to

setShadow(int)

Sets the

subType()

type()

 public EuVector generator

A generating vector of the line. Is normalized to be a unit vector.

 public EuLine(double x,
               double y,
               double deltax,
               double deltay) throws LeaRuntimeException

The constructor does initialization. A zero generator vector gives a LeaRuntimeException

Parameters:

x - the first coordinate of anchor

y - the second coordinate of anchor

deltax - the first coordinate of generator

deltay - the second coordinate of generator

 public EuWorkVector atParameter(double t)

Return in a @see EuWorkVector the coordinates of a point on the line at a given generator.

Parameters:

t - the parameter

Returns:

the coordinates

Overrides:

atParameter in class EuPoint

 protected double closestParameter(double x,
                                   double y)

Find the parameter value which yields the closest point to a given one.

Parameters:

x - The first coordinate of the given point

y - The second coordinate of the given point

Returns:

The parameter

 protected double closestParameter(EuVector v)

 protected void drawTheLine(Graphics g,
                            mouseVector pointA,
                            mouseVector pointB)

 public void draw(Graphics g,
                  mouseInfo info)

Draw the line, using the @see mouseInfo for scaling and positioning.

Parameters:

g - the Graphics handle on the window

info - information used in positioning the object

Overrides:

draw in class EuPoint

 public boolean castIdentical(EuObject other)

See if passed object can be cast to the present one.

Parameters:

other - the object being compared to the present one

Returns:

true if passed object is a @see EuLine, @see EuHalf or @see EuInterval which is a subset of this one

Overrides:

castIdentical in class EuPoint

 public boolean MouseVicinity(mouseVector mouseAt,
                              mouseInfo info)

See if mouse position is close to this line.

Parameters:

mouseAt - The coordinates of the mouse position

info - information used in locating the object on screen

Returns:

true if the mouse is close to the line.

 public boolean overlaps(EuObject other)

Acts identically to @see castIdentical()

Parameters:

other - the object being compared to the present one

Returns:

true if passed object is a @see EuLine, @see EuHalf or @see EuInterval which is a subset of this one

Overrides:

overlaps in class EuPoint

 public boolean interiorContains(EuVector point)

See if passed point lies on the line.

Parameters:

point - the point being compared to the present line

Returns:

true if passed point lies on the line.

Overrides:

interiorContains in class EuPoint

 public boolean closureContains(EuVector point)

See if passed point lies on the line.

Parameters:

point - the point being compared to the present line

Returns:

true if passed point lies on the line.

Overrides:

closureContains in class EuPoint

 public int type()

Returns:

@see LINE

Overrides:

type in class EuPoint

 public int subType()

Returns:

@see A_LINE

Overrides:

subType in class EuPoint

 public int myFullShadow()

Returns:

-1 as this object is full.

Overrides:

myFullShadow in class EuPoint

 protected boolean matchingPair(EuVector a,
                                EuVector b,
                                EuVector c,
                                EuVector d)

Overrides:

matchingPair in class EuPoint

 public void setShadow(int i)

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

Returns:

i the EuLab index (ignored)

Overrides:

setShadow in class EuPoint

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