org.opencv.core
Class Rect

java.lang.Object
  org.opencv.core.Rect

public class Rect
extends java.lang.Object

Template class for 2D rectangles, described by the following parameters:

• Coordinates of the top-left corner. This is a default interpretation of Rect_.x and Rect_.y in OpenCV. Though, in your algorithms you may count x and y from the bottom-left corner.
• Rectangle width and height.

OpenCV typically assumes that the top and left boundary of the rectangle are inclusive, while the right and bottom boundaries are not. For example, the method Rect_.contains returns true if

x <= pt.x < x+width,<BR>y <= pt.y < y+height

Virtually every loop over an imageROI in OpenCV (where ROI is specified by Rect_) is implemented as:

// C++ code:

for(int y = roi.y; y < roi.y + rect.height; y++)

for(int x = roi.x; x < roi.x + rect.width; x++)

//...

In addition to the class members, the following operations on rectangles are implemented:

• rect = rect +- point (shifting a rectangle by a certain offset)
• rect = rect +- size (expanding or shrinking a rectangle by a certain amount)
• rect += point, rect -= point, rect += size, rect -= size (augmenting operations)
• rect = rect1 & rect2 (rectangle intersection)
• rect = rect1 | rect2 (minimum area rectangle containing rect2 and rect3)
• rect &= rect1, rect |= rect1 (and the corresponding augmenting operations)
• rect == rect1, rect != rect1 (rectangle comparison)

This is an example how the partial ordering on rectangles can be established (rect1subseteq rect2):

// C++ code:

template inline bool

operator <= (const Rect_<_Tp>& r1, const Rect_<_Tp>& r2)

return (r1 & r2) == r1;

For your convenience, the Rect_<> alias is available:

typedef Rect_ Rect;

See Also:

org.opencv.core.Rect_

Field Summary

int	height
int	width
int	x
int	y

Constructor Summary

Rect()

Rect(double[] vals)

Rect(int x, int y, int width, int height)

Rect(Point p1, Point p2)

Rect(Point p, Size s)

Method Summary

double	area()
Point	br()
Rect	clone()
boolean	contains(Point p)
boolean	equals(java.lang.Object obj)
int	hashCode()
void	set(double[] vals)
Size	size()
Point	tl()
java.lang.String	toString()

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

height

public int height

width

public int width

x

public int x

y

public int y

Constructor Detail

Rect

public Rect()

Rect

public Rect(double[] vals)

Rect

public Rect(int x,
            int y,
            int width,
            int height)

Rect

public Rect(Point p1,
            Point p2)

Rect

public Rect(Point p,
            Size s)

Method Detail

area

public double area()

br

public Point br()

clone

public Rect clone()

Overrides:

clone in class java.lang.Object

contains

public boolean contains(Point p)

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

set

public void set(double[] vals)

size

public Size size()

tl

public Point tl()

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object