android.graphics
public class
public class
android.graphics.PointF
| java.lang.Object | ||
| android.graphics.PointF | ||
PointF holds two float coordinates
Summary
Fields
| public | float | x | |||
| public | float | y |
Public Constructors
| PointF() | |||||
| PointF(float x, float y) | |||||
| Set the point's X and Y coordinates | |||||
| PointF(int x, int y) | |||||
| Set the point's X and Y coordinates by automatically promoting (x,y) to float values. | |||||
| PointF(Point p) | |||||
| Set the point's X and Y coordinates by automatically promoting p's coordinates to float values. | |||||
Public Methods
| final | void | add(PointF v) | |||
| Add v's coordinates to the point's | |||||
| static | float | crossProduct(PointF a, PointF b) | |||
| Returns the cross product of a and b, treating them as 2D vectors | |||||
| static | PointF | difference(PointF a, PointF b) | |||
| Returns a new point whose coordinates are the difference between a's and b's (a - b) | |||||
| static | float | distance(PointF a, PointF b) | |||
| Returns the euclidian distance between a and b | |||||
| static | float | dotProduct(PointF a, PointF b) | |||
| Returns the dot product of a and b, treating them as 2D vectors | |||||
| final | boolean | equals(float _x, float _y) | |||
| Returns true if the point's coordinates equal (x,y) | |||||
| static | float | length(float x, float y) | |||
| Returns the euclidian distance from (0,0) to (x,y) | |||||
| final | float | length() | |||
| Return the euclidian distance from (0,0) to the point | |||||
| final | void | negate() | |||
| Negate the point's coordinates | |||||
| final | boolean | normalize() | |||
| Set the point (vector) to be unit-length in the same direction as it currently is, and return its old length. | |||||
| final | void | rotateCCW() | |||
| Rotate the point counter-clockwise by 90 degrees, writing the answer back into the point. | |||||
| final | void | rotateCW() | |||
| Rotate the point clockwise by 90 degrees, writing the answer back into the point. | |||||
| final | void | scale(float scale) | |||
| Scale the point's coordinates by scale, writing the answer into dst. | |||||
| final | void | set(float x, float y) | |||
| Set the point's X and Y coordinates | |||||
| final | void | set(int x, int y) | |||
| Set the point's X and Y coordinates by automatically promoting (x,y) to float values. | |||||
| final | void | set(PointF p) | |||
| Set the point's X and Y coordinates to the coordinates of p | |||||
| final | boolean | setLength(float length) | |||
| Scale the point to have the specified length, and return that length. | |||||
| final | boolean | setLength(float x, float y, float length) | |||
| Set the point to have the specified length in the same direction as (x,y), and return the old length of (x,y). | |||||
| final | boolean | setUnit(float x, float y) | |||
| Set the point (vector) to be unit-length in the same direction as the x,y params, and return their old length. | |||||
| final | void | subtract(PointF v) | |||
| Subtract v's coordinates from the point's | |||||
| static | PointF | sum(PointF a, PointF b) | |||
| Returns a new point whose coordinates are the sum of a's and b's (a + b) | |||||
Methods inherited
from class
java.lang.Object
Details
Fields
public float x
public float y
Public Constructors
public PointF()
public PointF(float x, float y)
Set the point's X and Y coordinates
public PointF(int x, int y)
Set the point's X and Y coordinates by automatically promoting (x,y) to float values.
public PointF(Point p)
Set the point's X and Y coordinates by automatically promoting p's coordinates to float values.
Public Methods
public final void add(PointF v)
Add v's coordinates to the point's
public static float crossProduct(PointF a, PointF b)
Returns the cross product of a and b, treating them as 2D vectors
public static PointF difference(PointF a, PointF b)
Returns a new point whose coordinates are the difference between a's and b's (a - b)
public static float dotProduct(PointF a, PointF b)
Returns the dot product of a and b, treating them as 2D vectors
public final boolean equals(float _x, float _y)
Returns true if the point's coordinates equal (x,y)
public static float length(float x, float y)
Returns the euclidian distance from (0,0) to (x,y)
public final float length()
Return the euclidian distance from (0,0) to the point
public final void negate()
Negate the point's coordinates
public final boolean normalize()
Set the point (vector) to be unit-length in the same direction as it
currently is, and return its old length. If the old length is
degenerately small (nearly zero), do nothing and return 0.
public final void rotateCCW()
Rotate the point counter-clockwise by 90 degrees, writing the answer back into the point.
public final void rotateCW()
Rotate the point clockwise by 90 degrees, writing the answer back into the point.
public final void scale(float scale)
Scale the point's coordinates by scale, writing the answer into dst.
public final void set(float x, float y)
Set the point's X and Y coordinates
public final void set(int x, int y)
Set the point's X and Y coordinates by automatically promoting (x,y) to float values.
public final void set(PointF p)
Set the point's X and Y coordinates to the coordinates of p
public final boolean setLength(float length)
Scale the point to have the specified length, and return that
length. If the original length is
degenerately small (nearly zero), do nothing and return 0.
public final boolean setLength(float x, float y, float length)
Set the point to have the specified length in the same direction as (x,y),
and return the old length of (x,y). If that old length is
degenerately small (nearly zero), do nothing and return 0.
public final boolean setUnit(float x, float y)
Set the point (vector) to be unit-length in the same direction as the
x,y params, and return their old length. If the old length is
degenerately small (nearly zero), do nothing and return 0.
public final void subtract(PointF v)
Subtract v's coordinates from the point's