org.havi.ui
Class HScreenRectangle

java.lang.Object
  org.havi.ui.HScreenRectangle

public class HScreenRectangle
extends Object

HScreenRectangle denotes a screen area expressed as a relative value of the screen dimensions. Note that since these are relative dimensions they are effectively independent of any particular screen's physical dimensions, or aspect ratio.

Note that the x and y offset coordinates of the top, left corner of the area are not constrained - they may be negative, or have values greater than one - and hence, may denote an offset location that is not "on-screen". The width and height of the area should be positive (including zero), but are otherwise unconstrained - and hence may denote areas greater in size than the entire screen.

Hence,

• (0.0, 0.0, 1.0, 1.0) denotes the whole of the screen.
• (0.0, 0.0, 0.5, 0.5) denotes the top, left hand quarter of the screen.
• (0.5, 0.0, 0.5, 0.5) denotes the top, right hand quarter of the screen.
• (0.25, 0.25, 0.5, 0.5) denotes a centered quarter-screen area of the screen.
• (0.0, 0.5, 0.5, 0.5) denotes the bottom, left hand quarter of the screen.
• (0.5, 0.5, 0.5, 0.5) denotes the bottom, right hand quarter of the screen.

Note that in practice, particularly in the case of television, the precise location may vary slightly due to effects of overscan, etc.

Note that systems using HScreenRectangles directly should consider the effects of rounding errors, etc.

The parameters to the constructors are as follows, in cases where parameters are not used, then the constructor should use the default values.

Default parameter values exposed in the constructors

Parameter	Description	Default value	Set method	Get method
x	The horizontal position of the top left corner	no default constructor exists	setLocation	---
y	The vertical position of the top left corner	no default constructor exists	setLocation	---
width	The width of the rectangle	no default constructor exists	setSize	---
height	The height of the rectangle	no default constructor exists	setSize	---

Default parameter values not exposed in the constructors

Description	Default value	Set method	Get method
None.

See Also:

HScreenPoint

Field Summary

float	height
float	width
float	x
float	y

Constructor Summary

HScreenRectangle(float x, float y, float width, float height)
Creates an HScreenRectangle object.

Method Summary

void	setLocation(float x, float y) Set the location of the top left corner of the HScreenRectangle.
void	setSize(float width, float height) Set the size of the HScreenRectangle.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

x

public float x

y

public float y

width

public float width

height

public float height

Constructor Detail

HScreenRectangle

public HScreenRectangle(float x,
                        float y,
                        float width,
                        float height)

Creates an HScreenRectangle object. See the class description for details of constructor parameters and default values.

Method Detail

setLocation

public void setLocation(float x,
                        float y)

Set the location of the top left corner of the HScreenRectangle.

Parameters:

x - the horizontal position of the top left corner

y - the vertical position of the top left corner

setSize

public void setSize(float width,
                    float height)

Set the size of the HScreenRectangle.

Parameters:

width - the width of the HScreenRectangle

height - the height of the HScreenRectangle