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Java™ Platform Standard Ed. 6 |
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java.lang.Objectjava.awt.geom.QuadCurve2D
public abstract class QuadCurve2D
The QuadCurve2D class defines a quadratic parametric curve
segment in (x,y) coordinate space.
This class is only the abstract superclass for all objects that store a 2D quadratic curve segment. The actual storage representation of the coordinates is left to the subclass.
| Nested Class Summary | |
|---|---|
static class |
QuadCurve2D.Double
A quadratic parametric curve segment specified with double coordinates. |
static class |
QuadCurve2D.Float
A quadratic parametric curve segment specified with float coordinates. |
| Constructor Summary | |
|---|---|
protected |
QuadCurve2D()
This is an abstract class that cannot be instantiated directly. |
| Method Summary | |
|---|---|
Object |
clone()
Creates a new object of the same class and with the same contents as this object. |
boolean |
contains(double x,
double y)
Tests if the specified coordinates are inside the boundary of the Shape. |
boolean |
contains(double x,
double y,
double w,
double h)
Tests if the interior of the Shape entirely contains
the specified rectangular area. |
boolean |
contains(Point2D p)
Tests if a specified Point2D is inside the boundary
of the Shape. |
boolean |
contains(Rectangle2D r)
Tests if the interior of the Shape entirely contains the
specified Rectangle2D. |
Rectangle |
getBounds()
Returns an integer Rectangle that completely encloses the
Shape. |
abstract Point2D |
getCtrlPt()
Returns the control point. |
abstract double |
getCtrlX()
Returns the X coordinate of the control point in double precision. |
abstract double |
getCtrlY()
Returns the Y coordinate of the control point in double precision. |
double |
getFlatness()
Returns the flatness, or maximum distance of a control point from the line connecting the end points, of this QuadCurve2D. |
static double |
getFlatness(double[] coords,
int offset)
Returns the flatness, or maximum distance of a control point from the line connecting the end points, of the quadratic curve specified by the control points stored in the indicated array at the indicated index. |
static double |
getFlatness(double x1,
double y1,
double ctrlx,
double ctrly,
double x2,
double y2)
Returns the flatness, or maximum distance of a control point from the line connecting the end points, of the quadratic curve specified by the indicated control points. |
double |
getFlatnessSq()
Returns the square of the flatness, or maximum distance of a control point from the line connecting the end points, of this QuadCurve2D. |
static double |
getFlatnessSq(double[] coords,
int offset)
Returns the square of the flatness, or maximum distance of a control point from the line connecting the end points, of the quadratic curve specified by the control points stored in the indicated array at the indicated index. |
static double |
getFlatnessSq(double x1,
double y1,
double ctrlx,
double ctrly,
double x2,
double y2)
Returns the square of the flatness, or maximum distance of a control point from the line connecting the end points, of the quadratic curve specified by the indicated control points. |
abstract Point2D |
getP1()
Returns the start point. |
abstract Point2D |
getP2()
Returns the end point. |
PathIterator |
getPathIterator(AffineTransform at)
Returns an iteration object that defines the boundary of the shape of this QuadCurve2D. |
PathIterator |
getPathIterator(AffineTransform at,
double flatness)
Returns an iteration object that defines the boundary of the flattened shape of this QuadCurve2D. |
abstract double |
getX1()
Returns the X coordinate of the start point in double in precision. |
abstract double |
getX2()
Returns the X coordinate of the end point in double precision. |
abstract double |
getY1()
Returns the Y coordinate of the start point in double precision. |
abstract double |
getY2()
Returns the Y coordinate of the end point in double precision. |
boolean |
intersects(double x,
double y,
double w,
double h)
Tests if the interior of the Shape intersects the
interior of a specified rectangular area. |
boolean |
intersects(Rectangle2D r)
Tests if the interior of the Shape intersects the
interior of a specified Rectangle2D. |
void |
setCurve(double[] coords,
int offset)
Sets the location of the end points and control points of this QuadCurve2D to the double coordinates at
the specified offset in the specified array. |
abstract void |
setCurve(double x1,
double y1,
double ctrlx,
double ctrly,
double x2,
double y2)
Sets the location of the end points and control point of this curve to the specified double coordinates. |
void |
setCurve(Point2D[] pts,
int offset)
Sets the location of the end points and control points of this QuadCurve2D to the coordinates of the
Point2D objects at the specified offset in
the specified array. |
void |
setCurve(Point2D p1,
Point2D cp,
Point2D p2)
Sets the location of the end points and control point of this QuadCurve2D to the specified Point2D
coordinates. |
void |
setCurve(QuadCurve2D c)
Sets the location of the end points and control point of this QuadCurve2D to the same as those in the specified
QuadCurve2D. |
static int |
solveQuadratic(double[] eqn)
Solves the quadratic whose coefficients are in the eqn
array and places the non-complex roots back into the same array,
returning the number of roots. |
static int |
solveQuadratic(double[] eqn,
double[] res)
Solves the quadratic whose coefficients are in the eqn
array and places the non-complex roots into the res
array, returning the number of roots. |
static void |
subdivide(double[] src,
int srcoff,
double[] left,
int leftoff,
double[] right,
int rightoff)
Subdivides the quadratic curve specified by the coordinates stored in the src array at indices
srcoff through srcoff + 5
and stores the resulting two subdivided curves into the two
result arrays at the corresponding indices. |
void |
subdivide(QuadCurve2D left,
QuadCurve2D right)
Subdivides this QuadCurve2D and stores the resulting
two subdivided curves into the left and
right curve parameters. |
static void |
subdivide(QuadCurve2D src,
QuadCurve2D left,
QuadCurve2D right)
Subdivides the quadratic curve specified by the src
parameter and stores the resulting two subdivided curves into the
left and right curve parameters. |
| Methods inherited from class java.lang.Object |
|---|
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Methods inherited from interface java.awt.Shape |
|---|
getBounds2D |
| Constructor Detail |
|---|
protected QuadCurve2D()
QuadCurve2D.Float,
QuadCurve2D.Double| Method Detail |
|---|
public abstract double getX1()
double in precision.
public abstract double getY1()
double precision.
public abstract Point2D getP1()
Point2D that is the start point of this
QuadCurve2D.public abstract double getCtrlX()
double precision.
public abstract double getCtrlY()
double precision.
public abstract Point2D getCtrlPt()
Point2D that is the control point of this
Point2D.public abstract double getX2()
double precision.
public abstract double getY2()
double precision.
public abstract Point2D getP2()
Point object that is the end point
of this Point2D.
public abstract void setCurve(double x1,
double y1,
double ctrlx,
double ctrly,
double x2,
double y2)
double coordinates.
x1 - the X coordinate of the start pointy1 - the Y coordinate of the start pointctrlx - the X coordinate of the control pointctrly - the Y coordinate of the control pointx2 - the X coordinate of the end pointy2 - the Y coordinate of the end point
public void setCurve(double[] coords,
int offset)
QuadCurve2D to the double coordinates at
the specified offset in the specified array.
coords - the array containing coordinate valuesoffset - the index into the array from which to start
getting the coordinate values and assigning them to this
QuadCurve2D
public void setCurve(Point2D p1,
Point2D cp,
Point2D p2)
QuadCurve2D to the specified Point2D
coordinates.
p1 - the start pointcp - the control pointp2 - the end point
public void setCurve(Point2D[] pts,
int offset)
QuadCurve2D to the coordinates of the
Point2D objects at the specified offset in
the specified array.
pts - an array containing Point2D that define
coordinate valuesoffset - the index into pts from which to start
getting the coordinate values and assigning them to this
QuadCurve2Dpublic void setCurve(QuadCurve2D c)
QuadCurve2D to the same as those in the specified
QuadCurve2D.
c - the specified QuadCurve2D
public static double getFlatnessSq(double x1,
double y1,
double ctrlx,
double ctrly,
double x2,
double y2)
x1 - the X coordinate of the start pointy1 - the Y coordinate of the start pointctrlx - the X coordinate of the control pointctrly - the Y coordinate of the control pointx2 - the X coordinate of the end pointy2 - the Y coordinate of the end point
public static double getFlatness(double x1,
double y1,
double ctrlx,
double ctrly,
double x2,
double y2)
x1 - the X coordinate of the start pointy1 - the Y coordinate of the start pointctrlx - the X coordinate of the control pointctrly - the Y coordinate of the control pointx2 - the X coordinate of the end pointy2 - the Y coordinate of the end point
public static double getFlatnessSq(double[] coords,
int offset)
coords - an array containing coordinate valuesoffset - the index into coords from which to
to start getting the values from the array
public static double getFlatness(double[] coords,
int offset)
coords - an array containing coordinate valuesoffset - the index into coords from which to
start getting the coordinate values
public double getFlatnessSq()
QuadCurve2D.
QuadCurve2D.public double getFlatness()
QuadCurve2D.
QuadCurve2D.
public void subdivide(QuadCurve2D left,
QuadCurve2D right)
QuadCurve2D and stores the resulting
two subdivided curves into the left and
right curve parameters.
Either or both of the left and right
objects can be the same as this QuadCurve2D or
null.
left - the QuadCurve2D object for storing the
left or first half of the subdivided curveright - the QuadCurve2D object for storing the
right or second half of the subdivided curve
public static void subdivide(QuadCurve2D src,
QuadCurve2D left,
QuadCurve2D right)
src
parameter and stores the resulting two subdivided curves into the
left and right curve parameters.
Either or both of the left and right
objects can be the same as the src object or
null.
src - the quadratic curve to be subdividedleft - the QuadCurve2D object for storing the
left or first half of the subdivided curveright - the QuadCurve2D object for storing the
right or second half of the subdivided curve
public static void subdivide(double[] src,
int srcoff,
double[] left,
int leftoff,
double[] right,
int rightoff)
src array at indices
srcoff through srcoff + 5
and stores the resulting two subdivided curves into the two
result arrays at the corresponding indices.
Either or both of the left and right
arrays can be null or a reference to the same array
and offset as the src array.
Note that the last point in the first subdivided curve is the
same as the first point in the second subdivided curve. Thus,
it is possible to pass the same array for left and
right and to use offsets such that
rightoff equals leftoff + 4 in order
to avoid allocating extra storage for this common point.
src - the array holding the coordinates for the source curvesrcoff - the offset into the array of the beginning of the
the 6 source coordinatesleft - the array for storing the coordinates for the first
half of the subdivided curveleftoff - the offset into the array of the beginning of the
the 6 left coordinatesright - the array for storing the coordinates for the second
half of the subdivided curverightoff - the offset into the array of the beginning of the
the 6 right coordinatespublic static int solveQuadratic(double[] eqn)
eqn
array and places the non-complex roots back into the same array,
returning the number of roots. The quadratic solved is represented
by the equation:
eqn = {C, B, A};
ax^2 + bx + c = 0
A return value of -1 is used to distinguish a constant
equation, which might be always 0 or never 0, from an equation that
has no zeroes.
eqn - the array that contains the quadratic coefficients
-1 if the equation is
a constant
public static int solveQuadratic(double[] eqn,
double[] res)
eqn
array and places the non-complex roots into the res
array, returning the number of roots.
The quadratic solved is represented by the equation:
eqn = {C, B, A};
ax^2 + bx + c = 0
A return value of -1 is used to distinguish a constant
equation, which might be always 0 or never 0, from an equation that
has no zeroes.
eqn - the specified array of coefficients to use to solve
the quadratic equationres - the array that contains the non-complex roots
resulting from the solution of the quadratic equation
-1 if the equation is
a constant.
public boolean contains(double x,
double y)
Shape.
contains in interface Shapex - the specified X coordinate to be testedy - the specified Y coordinate to be tested
true if the specified coordinates are inside
the Shape boundary; false
otherwise.public boolean contains(Point2D p)
Point2D is inside the boundary
of the Shape.
contains in interface Shapep - the specified Point2D to be tested
true if the specified Point2D is
inside the boundary of the Shape;
false otherwise.
public boolean intersects(double x,
double y,
double w,
double h)
Shape intersects the
interior of a specified rectangular area.
The rectangular area is considered to intersect the Shape
if any point is contained in both the interior of the
Shape and the specified rectangular area.
The Shape.intersects() method allows a Shape
implementation to conservatively return true when:
Shape intersect, but
Shapes this method might
return true even though the rectangular area does not
intersect the Shape.
The Area class performs
more accurate computations of geometric intersection than most
Shape objects and therefore can be used if a more precise
answer is required.
intersects in interface Shapex - the X coordinate of the upper-left corner
of the specified rectangular areay - the Y coordinate of the upper-left corner
of the specified rectangular areaw - the width of the specified rectangular areah - the height of the specified rectangular area
true if the interior of the Shape and
the interior of the rectangular area intersect, or are
both highly likely to intersect and intersection calculations
would be too expensive to perform; false otherwise.Areapublic boolean intersects(Rectangle2D r)
Shape intersects the
interior of a specified Rectangle2D.
The Shape.intersects() method allows a Shape
implementation to conservatively return true when:
Rectangle2D and the
Shape intersect, but
Shapes this method might
return true even though the Rectangle2D does not
intersect the Shape.
The Area class performs
more accurate computations of geometric intersection than most
Shape objects and therefore can be used if a more precise
answer is required.
intersects in interface Shaper - the specified Rectangle2D
true if the interior of the Shape and
the interior of the specified Rectangle2D
intersect, or are both highly likely to intersect and intersection
calculations would be too expensive to perform; false
otherwise.Shape.intersects(double, double, double, double)
public boolean contains(double x,
double y,
double w,
double h)
Shape entirely contains
the specified rectangular area. All coordinates that lie inside
the rectangular area must lie within the Shape for the
entire rectanglar area to be considered contained within the
Shape.
The Shape.contains() method allows a Shape
implementation to conservatively return false when:
intersect method returns true and
Shape entirely contains the rectangular area are
prohibitively expensive.
Shapes this method might
return false even though the Shape contains
the rectangular area.
The Area class performs
more accurate geometric computations than most
Shape objects and therefore can be used if a more precise
answer is required.
contains in interface Shapex - the X coordinate of the upper-left corner
of the specified rectangular areay - the Y coordinate of the upper-left corner
of the specified rectangular areaw - the width of the specified rectangular areah - the height of the specified rectangular area
true if the interior of the Shape
entirely contains the specified rectangular area;
false otherwise or, if the Shape
contains the rectangular area and the
intersects method returns true
and the containment calculations would be too expensive to
perform.Area,
Shape.intersects(double, double, double, double)public boolean contains(Rectangle2D r)
Shape entirely contains the
specified Rectangle2D.
The Shape.contains() method allows a Shape
implementation to conservatively return false when:
intersect method returns true and
Shape entirely contains the Rectangle2D
are prohibitively expensive.
Shapes this method might
return false even though the Shape contains
the Rectangle2D.
The Area class performs
more accurate geometric computations than most
Shape objects and therefore can be used if a more precise
answer is required.
contains in interface Shaper - The specified Rectangle2D
true if the interior of the Shape
entirely contains the Rectangle2D;
false otherwise or, if the Shape
contains the Rectangle2D and the
intersects method returns true
and the containment calculations would be too expensive to
perform.Shape.contains(double, double, double, double)public Rectangle getBounds()
Rectangle that completely encloses the
Shape. Note that there is no guarantee that the
returned Rectangle is the smallest bounding box that
encloses the Shape, only that the Shape
lies entirely within the indicated Rectangle. The
returned Rectangle might also fail to completely
enclose the Shape if the Shape overflows
the limited range of the integer data type. The
getBounds2D method generally returns a
tighter bounding box due to its greater flexibility in
representation.
getBounds in interface ShapeRectangle that completely encloses
the Shape.Shape.getBounds2D()public PathIterator getPathIterator(AffineTransform at)
QuadCurve2D.
The iterator for this class is not multi-threaded safe,
which means that this QuadCurve2D class does not
guarantee that modifications to the geometry of this
QuadCurve2D object do not affect any iterations of
that geometry that are already in process.
getPathIterator in interface Shapeat - an optional AffineTransform to apply to the
shape boundary
PathIterator object that defines the boundary
of the shape.
public PathIterator getPathIterator(AffineTransform at,
double flatness)
QuadCurve2D.
The iterator for this class is not multi-threaded safe,
which means that this QuadCurve2D class does not
guarantee that modifications to the geometry of this
QuadCurve2D object do not affect any iterations of
that geometry that are already in process.
getPathIterator in interface Shapeat - an optional AffineTransform to apply
to the boundary of the shapeflatness - the maximum distance that the control points for a
subdivided curve can be with respect to a line connecting
the end points of this curve before this curve is
replaced by a straight line connecting the end points.
PathIterator object that defines the
flattened boundary of the shape.public Object clone()
clone in class ObjectOutOfMemoryError - if there is not enough memory.Cloneable
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Java™ Platform Standard Ed. 6 |
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| PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
| SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD | |||||||||
Copyright 2006 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.