flash.geom.Rectangle - Adobe® Flex® 4 Language Reference (Flex 4)

Package	flash.geom
Class	public class Rectangle
Inheritance	Rectangle Object
Subclasses	RoundedRectangle

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0 Flash Player 9, Flash Lite 4

A Rectangle object is an area defined by its position, as indicated by its top-left corner point (x, y) and by its width and its height.

The x, y, width, and height properties of the Rectangle class are independent of each other; changing the value of one property has no effect on the others. However, the right and bottom properties are integrally related to those four properties. For example, if you change the value of the right property, the value of the width property changes; if you change the bottom property, the value of the height property changes.

The following methods and properties use Rectangle objects:

The applyFilter(), colorTransform(), copyChannel(), copyPixels(), draw(), fillRect(), generateFilterRect(), getColorBoundsRect(), getPixels(), merge(), paletteMap(), pixelDisolve(), setPixels(), and threshold() methods, and the rect property of the BitmapData class
The getBounds() and getRect() methods, and the scrollRect and scale9Grid properties of the DisplayObject class
The getCharBoundaries() method of the TextField class
The pixelBounds property of the Transform class
The bounds parameter for the startDrag() method of the Sprite class
The printArea parameter of the addPage() method of the PrintJob class

You can use the new Rectangle() constructor to create a Rectangle object.

Note: The Rectangle class does not define a rectangular Shape display object. To draw a rectangular Shape object onscreen, use the drawRect() method of the Graphics class.

View the examples

Public Properties

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Show Inherited Public Properties

	Property		Defined By
		bottom : Number The sum of the y and height properties.	Rectangle
		bottomRight : Point The location of the Rectangle object's bottom-right corner, determined by the values of the right and bottom properties.	Rectangle
		constructor : Object A reference to the class object or constructor function for a given object instance.	Object
		height : Number The height of the rectangle, in pixels.	Rectangle
		left : Number The x coordinate of the top-left corner of the rectangle.	Rectangle
		prototype : Object [static] A reference to the prototype object of a class or function object.	Object
		right : Number The sum of the x and width properties.	Rectangle
		size : Point The size of the Rectangle object, expressed as a Point object with the values of the width and height properties.	Rectangle
		top : Number The y coordinate of the top-left corner of the rectangle.	Rectangle
		topLeft : Point The location of the Rectangle object's top-left corner, determined by the x and y coordinates of the point.	Rectangle
		width : Number The width of the rectangle, in pixels.	Rectangle
		x : Number The x coordinate of the top-left corner of the rectangle.	Rectangle
		y : Number The y coordinate of the top-left corner of the rectangle.	Rectangle

Public Methods

Hide Inherited Public Methods

Show Inherited Public Methods

	Method		Defined By
		Rectangle(x:Number = 0, y:Number = 0, width:Number = 0, height:Number = 0) Creates a new Rectangle object with the top-left corner specified by the x and y parameters and with the specified width and height parameters.	Rectangle
		clone():Rectangle Returns a new Rectangle object with the same values for the x, y, width, and height properties as the original Rectangle object.	Rectangle
		contains(x:Number, y:Number):Boolean Determines whether the specified point is contained within the rectangular region defined by this Rectangle object.	Rectangle
		containsPoint(point:Point):Boolean Determines whether the specified point is contained within the rectangular region defined by this Rectangle object.	Rectangle
		containsRect(rect:Rectangle):Boolean Determines whether the Rectangle object specified by the rect parameter is contained within this Rectangle object.	Rectangle
		equals(toCompare:Rectangle):Boolean Determines whether the object specified in the toCompare parameter is equal to this Rectangle object.	Rectangle
		hasOwnProperty(name:String):Boolean Indicates whether an object has a specified property defined.	Object
		inflate(dx:Number, dy:Number):void Increases the size of the Rectangle object by the specified amounts, in pixels.	Rectangle
		inflatePoint(point:Point):void Increases the size of the Rectangle object.	Rectangle
		intersection(toIntersect:Rectangle):Rectangle If the Rectangle object specified in the toIntersect parameter intersects with this Rectangle object, returns the area of intersection as a Rectangle object.	Rectangle
		intersects(toIntersect:Rectangle):Boolean Determines whether the object specified in the toIntersect parameter intersects with this Rectangle object.	Rectangle
		isEmpty():Boolean Determines whether or not this Rectangle object is empty.	Rectangle
		isPrototypeOf(theClass:Object):Boolean Indicates whether an instance of the Object class is in the prototype chain of the object specified as the parameter.	Object
		offset(dx:Number, dy:Number):void Adjusts the location of the Rectangle object, as determined by its top-left corner, by the specified amounts.	Rectangle
		offsetPoint(point:Point):void Adjusts the location of the Rectangle object using a Point object as a parameter.	Rectangle
		propertyIsEnumerable(name:String):Boolean Indicates whether the specified property exists and is enumerable.	Object
		setEmpty():void Sets all of the Rectangle object's properties to 0.	Rectangle
		setPropertyIsEnumerable(name:String, isEnum:Boolean = true):void Sets the availability of a dynamic property for loop operations.	Object
		toLocaleString():String Returns the string representation of this object, formatted according to locale-specific conventions.	Object
		toString():String Builds and returns a string that lists the horizontal and vertical positions and the width and height of the Rectangle object.	Rectangle
		union(toUnion:Rectangle):Rectangle Adds two rectangles together to create a new Rectangle object, by filling in the horizontal and vertical space between the two rectangles.	Rectangle
		valueOf():Object Returns the primitive value of the specified object.	Object

Property Detail

bottom

property

bottom:Number

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0 Flash Player 9, Flash Lite 4

The sum of the y and height properties.

A rectangle image showing location and measurement properties.

Implementation
public function get bottom():Number
public function set bottom(value:Number):void

See also

y
height

bottomRight

property

bottomRight:Point

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0 Flash Player 9, Flash Lite 4

The location of the Rectangle object's bottom-right corner, determined by the values of the right and bottom properties.

A rectangle image showing location and measurement properties.

Implementation
public function get bottomRight():Point
public function set bottomRight(value:Point):void

See also

flash.geom.Point

height

property

public var height:Number

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0 Flash Player 9, Flash Lite 4

The height of the rectangle, in pixels. Changing the height value of a Rectangle object has no effect on the x, y, and width properties.

A rectangle image showing location and measurement properties.

See also

x
y
height

left

property

left:Number

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0 Flash Player 9, Flash Lite 4

The x coordinate of the top-left corner of the rectangle. Changing the left property of a Rectangle object has no effect on the y and height properties. However it does affect the width property, whereas changing the x value does not affect the width property.

The value of the left property is equal to the value of the x property.

A rectangle image showing location and measurement properties.

Implementation
public function get left():Number
public function set left(value:Number):void

See also

x
y
width
height

right

property

right:Number

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0 Flash Player 9, Flash Lite 4

The sum of the x and width properties.

A rectangle image showing location and measurement properties.

Implementation
public function get right():Number
public function set right(value:Number):void

See also

x
width

size

property

size:Point

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0 Flash Player 9, Flash Lite 4

The size of the Rectangle object, expressed as a Point object with the values of the width and height properties.

Implementation
public function get size():Point
public function set size(value:Point):void

See also

flash.geom.Point

top

property

top:Number

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0 Flash Player 9, Flash Lite 4

The y coordinate of the top-left corner of the rectangle. Changing the top property of a Rectangle object has no effect on the x and width properties. However it does affect the height property, whereas changing the y value does not affect the height property.

The value of the top property is equal to the value of the y property.

A rectangle image showing location and measurement properties.

Implementation
public function get top():Number
public function set top(value:Number):void

See also

x
y
width
height

topLeft

property

topLeft:Point

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0 Flash Player 9, Flash Lite 4

The location of the Rectangle object's top-left corner, determined by the x and y coordinates of the point.

A rectangle image showing location and measurement properties.

Implementation
public function get topLeft():Point
public function set topLeft(value:Point):void

See also

flash.geom.Point
x
y

width

property

public var width:Number

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0 Flash Player 9, Flash Lite 4

The width of the rectangle, in pixels. Changing the width value of a Rectangle object has no effect on the x, y, and height properties.

A rectangle image showing location and measurement properties.

See also

x
y
height

x

property

public var x:Number

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0 Flash Player 9, Flash Lite 4

The x coordinate of the top-left corner of the rectangle. Changing the value of the x property of a Rectangle object has no effect on the y, width, and height properties.

The value of the x property is equal to the value of the left property.

See also

left

y

property

public var y:Number

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0 Flash Player 9, Flash Lite 4

The y coordinate of the top-left corner of the rectangle. Changing the value of the y property of a Rectangle object has no effect on the x, width, and height properties.

The value of the y property is equal to the value of the top property.

See also

x
width
height
top

Constructor Detail

Rectangle

()

Constructor

public function Rectangle(x:Number = 0, y:Number = 0, width:Number = 0, height:Number = 0)

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0 Flash Player 9, Flash Lite 4

Creates a new Rectangle object with the top-left corner specified by the x and y parameters and with the specified width and height parameters. If you call this function without parameters, a rectangle with x, y, width, and height properties set to 0 is created.

Parameters

	`x:Number` (default = `0`) — The x coordinate of the top-left corner of the rectangle.

	`y:Number` (default = `0`) — The y coordinate of the top-left corner of the rectangle.

	`width:Number` (default = `0`) — The width of the rectangle, in pixels.

	`height:Number` (default = `0`) — The height of the rectangle, in pixels.

See also

x
y
width
height

Method Detail

clone

()

method

public function clone():Rectangle

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0 Flash Player 9, Flash Lite 4

Returns a new Rectangle object with the same values for the x, y, width, and height properties as the original Rectangle object.

Returns

Rectangle — A new Rectangle object with the same values for the x, y, width, and height properties as the original Rectangle object.

See also

x
y
width
height

contains

()

method

public function contains(x:Number, y:Number):Boolean

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0 Flash Player 9, Flash Lite 4

Determines whether the specified point is contained within the rectangular region defined by this Rectangle object.

Parameters

	`x:Number` — The x coordinate (horizontal position) of the point.

	`y:Number` — The y coordinate (vertical position) of the point.

Returns

Boolean — A value of true if the Rectangle object contains the specified point; otherwise false.

See also

flash.geom.Point

containsPoint

()

method

public function containsPoint(point:Point):Boolean

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0 Flash Player 9, Flash Lite 4

Determines whether the specified point is contained within the rectangular region defined by this Rectangle object. This method is similar to the Rectangle.contains() method, except that it takes a Point object as a parameter.

Parameters

point:Point — The point, as represented by its x and y coordinates.

Returns

Boolean — A value of true if the Rectangle object contains the specified point; otherwise false.

See also

contains()
flash.geom.Point

containsRect

()

method

public function containsRect(rect:Rectangle):Boolean

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0 Flash Player 9, Flash Lite 4

Determines whether the Rectangle object specified by the rect parameter is contained within this Rectangle object. A Rectangle object is said to contain another if the second Rectangle object falls entirely within the boundaries of the first.

Parameters

rect:Rectangle — The Rectangle object being checked.

Returns

Boolean — A value of true if the Rectangle object that you specify is contained by this Rectangle object; otherwise false.

equals

()

method

public function equals(toCompare:Rectangle):Boolean

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0 Flash Player 9, Flash Lite 4

Determines whether the object specified in the toCompare parameter is equal to this Rectangle object. This method compares the x, y, width, and height properties of an object against the same properties of this Rectangle object.

Parameters

toCompare:Rectangle — The rectangle to compare to this Rectangle object.

Returns

Boolean — A value of true if the object has exactly the same values for the x, y, width, and height properties as this Rectangle object; otherwise false.

See also

x
y
width
height

inflate

()

method

public function inflate(dx:Number, dy:Number):void

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0 Flash Player 9, Flash Player 9, Flash Lite 4

Increases the size of the Rectangle object by the specified amounts, in pixels. The center point of the Rectangle object stays the same, and its size increases to the left and right by the dx value, and to the top and the bottom by the dy value.

Parameters

	`dx:Number` — The value to be added to the left and the right of the Rectangle object. The following equation is used to calculate the new width and position of the rectangle: x -= dx; width += 2 * dx;

	`dy:Number` — The value to be added to the top and the bottom of the Rectangle. The following equation is used to calculate the new height and position of the rectangle: y -= dy; height += 2 * dy;

See also

x
y

inflatePoint

()

method

public function inflatePoint(point:Point):void

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0 Flash Player 9, Flash Lite 4

Increases the size of the Rectangle object. This method is similar to the Rectangle.inflate() method except it takes a Point object as a parameter.

The following two code examples give the same result:

     var rect1:Rectangle = new Rectangle(0,0,2,5);
     rect1.inflate(2,2)

     var rect1:Rectangle = new Rectangle(0,0,2,5);
     var pt1:Point = new Point(2,2);
     rect1.inflatePoint(pt1)

Parameters

point:Point — The x property of this Point object is used to increase the horizontal dimension of the Rectangle object. The y property is used to increase the vertical dimension of the Rectangle object.

See also

flash.geom.Point

intersection

()

method

public function intersection(toIntersect:Rectangle):Rectangle

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0 Flash Player 9, Flash Lite 4

If the Rectangle object specified in the toIntersect parameter intersects with this Rectangle object, returns the area of intersection as a Rectangle object. If the rectangles do not intersect, this method returns an empty Rectangle object with its properties set to 0.

The resulting intersection rectangle.

Parameters

toIntersect:Rectangle — The Rectangle object to compare against to see if it intersects with this Rectangle object.

Returns

Rectangle — A Rectangle object that equals the area of intersection. If the rectangles do not intersect, this method returns an empty Rectangle object; that is, a rectangle with its x, y, width, and height properties set to 0.

intersects

()

method

public function intersects(toIntersect:Rectangle):Boolean

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0 Flash Player 9, Flash Lite 4

Determines whether the object specified in the toIntersect parameter intersects with this Rectangle object. This method checks the x, y, width, and height properties of the specified Rectangle object to see if it intersects with this Rectangle object.

Parameters

toIntersect:Rectangle — The Rectangle object to compare against this Rectangle object.

Returns

Boolean — A value of true if the specified object intersects with this Rectangle object; otherwise false.

See also

x
y
width
height

isEmpty

()

method

public function isEmpty():Boolean

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0 Flash Player 9, Flash Lite 4

Determines whether or not this Rectangle object is empty.

Returns

Boolean — A value of true if the Rectangle object's width or height is less than or equal to 0; otherwise false.

offset

()

method

public function offset(dx:Number, dy:Number):void

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0 Flash Player 9, Flash Lite 4

Adjusts the location of the Rectangle object, as determined by its top-left corner, by the specified amounts.

Parameters

	`dx:Number` — Moves the x value of the Rectangle object by this amount.

	`dy:Number` — Moves the y value of the Rectangle object by this amount.

offsetPoint

()

method

public function offsetPoint(point:Point):void

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0 Flash Player 9, Flash Lite 4

Adjusts the location of the Rectangle object using a Point object as a parameter. This method is similar to the Rectangle.offset() method, except that it takes a Point object as a parameter.

Parameters

point:Point — A Point object to use to offset this Rectangle object.

See also

flash.geom.Point

setEmpty

()

method

public function setEmpty():void

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0 Flash Player 9, Flash Lite 4

Sets all of the Rectangle object's properties to 0. A Rectangle object is empty if its width or height is less than or equal to 0.

This method sets the values of the x, y, width, and height properties to 0.

See also

x
y
width
height

toString

()

method

public function toString():String

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0 Flash Player 9, Flash Lite 4

Builds and returns a string that lists the horizontal and vertical positions and the width and height of the Rectangle object.

Returns

String — A string listing the value of each of the following properties of the Rectangle object: x, y, width, and height.

See also

x
y
width
height

union

()

method

public function union(toUnion:Rectangle):Rectangle

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0 Flash Player 9, Flash Lite 4

Adds two rectangles together to create a new Rectangle object, by filling in the horizontal and vertical space between the two rectangles.

The resulting union rectangle.

Note: The union() method ignores rectangles with 0 as the height or width value, such as: var rect2:Rectangle = new Rectangle(300,300,50,0);

Parameters

toUnion:Rectangle — A Rectangle object to add to this Rectangle object.

Returns

Rectangle — A new Rectangle object that is the union of the two rectangles.

Examples How to use this example

RectangleExample.as

The following example uses the RectangleExample class to create three new Rectangle objects at various x,y coordinates and with various heights and widths and then uses the trace() method to confirm that the Rectangle instances were successfully created. Then a Boolean variable isContained is assigned to the result of the call to the containsRect() method, which determines that the second rectangle does not fully enclose the third rectangle.

package {
    import flash.display.Sprite;
    import flash.geom.Rectangle;

    public class RectangleExample extends Sprite {

        public function RectangleExample() {
            var firstRect:Rectangle = new Rectangle();
            trace(firstRect);  // (x=0, y=0, w=0, h=0)
            var secondRect:Rectangle = new Rectangle(1, 3, 11, 13);
            trace(secondRect); // (x=1, y=3, w=11, h=13)
            var thirdRect:Rectangle = new Rectangle(5, 8, 17, 19);
            trace(thirdRect);  // (x=5, y=8, w=17, h=19)
            var isContained:Boolean = secondRect.containsRect(thirdRect);
            trace(isContained); // false
        }
    }
}