Build 1.0_r1(from source)

android.graphics
Class RectF

java.lang.Object
  extended by android.graphics.RectF

public class RectF
extends Object

RectF holds four float coordinates for a rectangle. The rectangle is represented by the coordinates of its 4 edges (left, top, right bottom). These fields can be accessed directly. Use width() and height() to retrieve the rectangle's width and height. Note: most methods do not check to see that the coordinates are sorted correctly (i.e. left <= right="" and="" top=""><= bottom).="">


Field Summary
 float bottom
           
 float left
           
 float right
           
 float top
           
 
Constructor Summary
RectF()
          Create a new empty RectF.
RectF(float left, float top, float right, float bottom)
          Create a new rectangle with the specified coordinates.
RectF(Rect r)
           
RectF(RectF r)
          Create a new rectangle, initialized with the values in the specified rectangle (which is left unmodified).
 
Method Summary
 float centerX()
           
 float centerY()
           
 boolean contains(float x, float y)
          Returns true if (x,y) is inside the rectangle.
 boolean contains(float left, float top, float right, float bottom)
          Returns true iff the 4 specified sides of a rectangle are inside or equal to this rectangle.
 boolean contains(RectF r)
          Returns true iff the specified rectangle r is inside or equal to this rectangle.
 float height()
           
 void inset(float dx, float dy)
          Inset the rectangle by (dx,dy).
 boolean intersect(float left, float top, float right, float bottom)
          If the rectangle specified by left,top,right,bottom intersects this rectangle, return true and set this rectangle to that intersection, otherwise return false and do not change this rectangle.
 boolean intersect(RectF r)
          If the specified rectangle intersects this rectangle, return true and set this rectangle to that intersection, otherwise return false and do not change this rectangle.
 boolean intersects(float left, float top, float right, float bottom)
          Returns true if this rectangle intersects the specified rectangle.
static boolean intersects(RectF a, RectF b)
          Returns true iff the two specified rectangles intersect.
 boolean isEmpty()
          Returns true if the rectangle is empty (left >= right or top >= bottom)
 void offset(float dx, float dy)
          Offset the rectangle by adding dx to its left and right coordinates, and adding dy to its top and bottom coordinates.
 void offsetTo(float newLeft, float newTop)
          Offset the rectangle to a specific (left, top) position, keeping its width and height the same.
 void round(Rect dst)
          Set the dst integer Rect by rounding this rectangle's coordinates to their nearest integer values.
 void roundOut(Rect dst)
          Set the dst integer Rect by rounding "out" this rectangle, choosing the floor of top and left, and the ceiling of right and bottom.
 void set(float left, float top, float right, float bottom)
          Set the rectangle's coordinates to the specified values.
 void set(Rect src)
          Copy the coordinates from src into this rectangle.
 void set(RectF src)
          Copy the coordinates from src into this rectangle.
 void setEmpty()
          Set the rectangle to (0,0,0,0)
 boolean setIntersect(RectF a, RectF b)
          If rectangles a and b intersect, return true and set this rectangle to that intersection, otherwise return false and do not change this rectangle.
 void sort()
          Swap top/bottom or left/right if there are flipped (i.e.
 String toString()
          Returns a string containing a concise, human-readable description of the receiver.
 void union(float x, float y)
          Update this Rect to enclose itself and the [x,y] coordinate.
 void union(float left, float top, float right, float bottom)
          Update this Rect to enclose itself and the specified rectangle.
 void union(RectF r)
          Update this Rect to enclose itself and the specified rectangle.
 float width()
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Field Detail

left

public float left

top

public float top

right

public float right

bottom

public float bottom
Constructor Detail

RectF

public RectF()
Create a new empty RectF. All coordinates are initialized to 0.


RectF

public RectF(float left,
             float top,
             float right,
             float bottom)
Create a new rectangle with the specified coordinates. Note: no range checking is performed, so the caller must ensure that left <= right="" and="" top=""><= bottom.="">

Parameters:
left - The X coordinate of the left side of the rectagle
top - The Y coordinate of the top of the rectangle
right - The X coordinate of the right side of the rectagle
bottom - The Y coordinate of the bottom of the rectangle

RectF

public RectF(RectF r)
Create a new rectangle, initialized with the values in the specified rectangle (which is left unmodified).

Parameters:
r - The rectangle whose coordinates are copied into the new rectangle.

RectF

public RectF(Rect r)
Method Detail

toString

public String toString()
Description copied from class: Object
Returns a string containing a concise, human-readable description of the receiver.

Overrides:
toString in class Object
Returns:
String a printable representation for the receiver.

isEmpty

public final boolean isEmpty()
Returns true if the rectangle is empty (left >= right or top >= bottom)


width

public final float width()
Returns:
the rectangle's width. This does not check for a valid rectangle (i.e. left <= right)="" so="" the="" result="" may="" be="">

height

public final float height()
Returns:
the rectangle's height. This does not check for a valid rectangle (i.e. top <= bottom)="" so="" the="" result="" may="" be="">

centerX

public final float centerX()
Returns:
the horizontal center of the rectangle. This does not check for a valid rectangle (i.e. left <=>

centerY

public final float centerY()
Returns:
the vertical center of the rectangle. This does not check for a valid rectangle (i.e. top <=>

setEmpty

public void setEmpty()
Set the rectangle to (0,0,0,0)


set

public void set(float left,
                float top,
                float right,
                float bottom)
Set the rectangle's coordinates to the specified values. Note: no range checking is performed, so it is up to the caller to ensure that left <= right="" and="" top=""><= bottom.="">

Parameters:
left - The X coordinate of the left side of the rectagle
top - The Y coordinate of the top of the rectangle
right - The X coordinate of the right side of the rectagle
bottom - The Y coordinate of the bottom of the rectangle

set

public void set(RectF src)
Copy the coordinates from src into this rectangle.

Parameters:
src - The rectangle whose coordinates are copied into this rectangle.

set

public void set(Rect src)
Copy the coordinates from src into this rectangle.

Parameters:
src - The rectangle whose coordinates are copied into this rectangle.

offset

public void offset(float dx,
                   float dy)
Offset the rectangle by adding dx to its left and right coordinates, and adding dy to its top and bottom coordinates.

Parameters:
dx - The amount to add to the rectangle's left and right coordinates
dy - The amount to add to the rectangle's top and bottom coordinates

offsetTo

public void offsetTo(float newLeft,
                     float newTop)
Offset the rectangle to a specific (left, top) position, keeping its width and height the same.

Parameters:
newLeft - The new "left" coordinate for the rectangle
newTop - The new "top" coordinate for the rectangle

inset

public void inset(float dx,
                  float dy)
Inset the rectangle by (dx,dy). If dx is positive, then the sides are moved inwards, making the rectangle narrower. If dx is negative, then the sides are moved outwards, making the rectangle wider. The same holds true for dy and the top and bottom.

Parameters:
dx - The amount to add(subtract) from the rectangle's left(right)
dy - The amount to add(subtract) from the rectangle's top(bottom)

contains

public boolean contains(float x,
                        float y)
Returns true if (x,y) is inside the rectangle. The left and top are considered to be inside, while the right and bottom are not. This means that for a x,y to be contained: left <= x="">< right="" and="" top=""><= y="">< bottom.="" an="" empty="" rectangle="" never="" contains="" any="" point.="">

Parameters:
x - The X coordinate of the point being tested for containment
y - The Y coordinate of the point being tested for containment
Returns:
true iff (x,y) are contained by the rectangle, where containment means left <= x="">< right="" and="" top=""><= y=""><>

contains

public boolean contains(float left,
                        float top,
                        float right,
                        float bottom)
Returns true iff the 4 specified sides of a rectangle are inside or equal to this rectangle. i.e. is this rectangle a superset of the specified rectangle. An empty rectangle never contains another rectangle.

Parameters:
left - The left side of the rectangle being tested for containment
top - The top of the rectangle being tested for containment
right - The right side of the rectangle being tested for containment
bottom - The bottom of the rectangle being tested for containment
Returns:
true iff the the 4 specified sides of a rectangle are inside or equal to this rectangle

contains

public boolean contains(RectF r)
Returns true iff the specified rectangle r is inside or equal to this rectangle. An empty rectangle never contains another rectangle.

Parameters:
r - The rectangle being tested for containment.
Returns:
true iff the specified rectangle r is inside or equal to this rectangle

intersect

public boolean intersect(float left,
                         float top,
                         float right,
                         float bottom)
If the rectangle specified by left,top,right,bottom intersects this rectangle, return true and set this rectangle to that intersection, otherwise return false and do not change this rectangle. No check is performed to see if either rectangle is empty. Note: To just test for intersection, use intersects()

Parameters:
left - The left side of the rectangle being intersected with this rectangle
top - The top of the rectangle being intersected with this rectangle
right - The right side of the rectangle being intersected with this rectangle.
bottom - The bottom of the rectangle being intersected with this rectangle.
Returns:
true if the specified rectangle and this rectangle intersect (and this rectangle is then set to that intersection) else return false and do not change this rectangle.

intersect

public boolean intersect(RectF r)
If the specified rectangle intersects this rectangle, return true and set this rectangle to that intersection, otherwise return false and do not change this rectangle. No check is performed to see if either rectangle is empty. To just test for intersection, use intersects()

Parameters:
r - The rectangle being intersected with this rectangle.
Returns:
true if the specified rectangle and this rectangle intersect (and this rectangle is then set to that intersection) else return false and do not change this rectangle.

setIntersect

public boolean setIntersect(RectF a,
                            RectF b)
If rectangles a and b intersect, return true and set this rectangle to that intersection, otherwise return false and do not change this rectangle. No check is performed to see if either rectangle is empty. To just test for intersection, use intersects()

Parameters:
a - The first rectangle being intersected with
b - The second rectangle being intersected with
Returns:
true iff the two specified rectangles intersect. If they do, set this rectangle to that intersection. If they do not, return false and do not change this rectangle.

intersects

public boolean intersects(float left,
                          float top,
                          float right,
                          float bottom)
Returns true if this rectangle intersects the specified rectangle. In no event is this rectangle modified. No check is performed to see if either rectangle is empty. To record the intersection, use intersect() or setIntersect().

Parameters:
left - The left side of the rectangle being tested for intersection
top - The top of the rectangle being tested for intersection
right - The right side of the rectangle being tested for intersection
bottom - The bottom of the rectangle being tested for intersection
Returns:
true iff the specified rectangle intersects this rectangle. In no event is this rectangle modified.

intersects

public static boolean intersects(RectF a,
                                 RectF b)
Returns true iff the two specified rectangles intersect. In no event are either of the rectangles modified. To record the intersection, use intersect() or setIntersect().

Parameters:
a - The first rectangle being tested for intersection
b - The second rectangle being tested for intersection
Returns:
true iff the two specified rectangles intersect. In no event are either of the rectangles modified.

round

public void round(Rect dst)
Set the dst integer Rect by rounding this rectangle's coordinates to their nearest integer values.


roundOut

public void roundOut(Rect dst)
Set the dst integer Rect by rounding "out" this rectangle, choosing the floor of top and left, and the ceiling of right and bottom.


union

public void union(float left,
                  float top,
                  float right,
                  float bottom)
Update this Rect to enclose itself and the specified rectangle. If the specified rectangle is empty, nothing is done. If this rectangle is empty it is set to the specified rectangle.

Parameters:
left - The left edge being unioned with this rectangle
top - The top edge being unioned with this rectangle
right - The right edge being unioned with this rectangle
bottom - The bottom edge being unioned with this rectangle

union

public void union(RectF r)
Update this Rect to enclose itself and the specified rectangle. If the specified rectangle is empty, nothing is done. If this rectangle is empty it is set to the specified rectangle.

Parameters:
r - The rectangle being unioned with this rectangle

union

public void union(float x,
                  float y)
Update this Rect to enclose itself and the [x,y] coordinate. There is no check to see that this rectangle is non-empty.

Parameters:
x - The x coordinate of the point to add to the rectangle
y - The y coordinate of the point to add to the rectangle

sort

public void sort()
Swap top/bottom or left/right if there are flipped (i.e. left > right and/or top > bottom). This can be called if the edges are computed separately, and may have crossed over each other. If the edges are already correct (i.e. left <= right="" and="" top=""><= bottom)="" then="" nothing="" is="" done.="">


Build 1.0_r1(from source)

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