com.jgoodies.forms.util
Class AbstractUnitConverter

java.lang.Object
  com.jgoodies.forms.util.AbstractUnitConverter

All Implemented Interfaces:

UnitConverter

Direct Known Subclasses:

DefaultUnitConverter

public abstract class AbstractUnitConverter
extends java.lang.Object
implements UnitConverter

An abstract implementation of the UnitConverter interface that minimizes the effort required to convert font-dependent sizes to pixels.

Version:

$Revision: 54721 $

Author:

Karsten Lentzsch

See Also:

DefaultUnitConverter, Size, Sizes

Field Summary

private static int	defaultScreenResolution
private static int	DTP_RESOLUTION

Constructor Summary

AbstractUnitConverter()

Method Summary

int	centimeterAsPixel(double cm, java.awt.Component component) Converts Centimeters and returns pixels using the resolution of the given component's graphics object.
protected int	centimeterAsPixel(double cm, int dpi) Converts Centimeters and returns pixels using the specified resolution.
protected double	computeAverageCharWidth(java.awt.FontMetrics metrics, java.lang.String testString) Computes and returns the average character width of the specified test string using the given FontMetrics.
int	dialogUnitXAsPixel(int dluX, java.awt.Component c) Converts horizontal dialog units and returns pixels.
protected int	dialogUnitXAsPixel(int dluX, double dialogBaseUnitsX) Converts horizontal dialog units and returns pixels.
int	dialogUnitYAsPixel(int dluY, java.awt.Component c) Converts vertical dialog units and returns pixels.
protected int	dialogUnitYAsPixel(int dluY, double dialogBaseUnitsY) Converts vertical dialog units and returns pixels.
protected int	getDefaultScreenResolution() Computes and returns the default resolution.
protected abstract double	getDialogBaseUnitsX(java.awt.Component component) Gets and returns the horizontal dialog base units.
protected abstract double	getDialogBaseUnitsY(java.awt.Component component) Gets and returns the vertical dialog base units.
protected int	getScreenResolution(java.awt.Component c) Returns the components screen resolution or the default screen resolution if the component is null or has no toolkit assigned yet.
int	inchAsPixel(double in, java.awt.Component component) Converts Inches and returns pixels using the specified resolution.
protected int	inchAsPixel(double in, int dpi) Converts Inches and returns pixels using the specified resolution.
int	millimeterAsPixel(double mm, java.awt.Component component) Converts Millimeters and returns pixels using the resolution of the given component's graphics object.
protected int	millimeterAsPixel(double mm, int dpi) Converts Millimeters and returns pixels using the specified resolution.
int	pointAsPixel(int pt, java.awt.Component component) Converts DTP Points and returns pixels using the resolution of the given component's graphics object.
protected int	pointAsPixel(int pt, int dpi) Converts DTP Points and returns pixels using the specified resolution.

Methods inherited from class java.lang.Object

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

Field Detail

DTP_RESOLUTION

private static final int DTP_RESOLUTION

See Also:

Constant Field Values

defaultScreenResolution

private static int defaultScreenResolution

Constructor Detail

AbstractUnitConverter

public AbstractUnitConverter()

Method Detail

inchAsPixel

public int inchAsPixel(double in,
                       java.awt.Component component)

Converts Inches and returns pixels using the specified resolution.

Specified by:

inchAsPixel in interface UnitConverter

Parameters:

in - the Inches

component - the component that provides the graphics object

Returns:

the given Inches as pixels

millimeterAsPixel

public int millimeterAsPixel(double mm,
                             java.awt.Component component)

Converts Millimeters and returns pixels using the resolution of the given component's graphics object.

Specified by:

millimeterAsPixel in interface UnitConverter

Parameters:

mm - Millimeters

component - the component that provides the graphics object

Returns:

the given Millimeters as pixels

centimeterAsPixel

public int centimeterAsPixel(double cm,
                             java.awt.Component component)

Converts Centimeters and returns pixels using the resolution of the given component's graphics object.

Specified by:

centimeterAsPixel in interface UnitConverter

Parameters:

cm - Centimeters

component - the component that provides the graphics object

Returns:

the given Centimeters as pixels

pointAsPixel

public int pointAsPixel(int pt,
                        java.awt.Component component)

Converts DTP Points and returns pixels using the resolution of the given component's graphics object.

Specified by:

pointAsPixel in interface UnitConverter

Parameters:

pt - DTP Points

component - the component that provides the graphics object

Returns:

the given Points as pixels

dialogUnitXAsPixel

public int dialogUnitXAsPixel(int dluX,
                              java.awt.Component c)

Converts horizontal dialog units and returns pixels. Honors the resolution, dialog font size, platform, and l&f.

Specified by:

dialogUnitXAsPixel in interface UnitConverter

Parameters:

dluX - the horizontal dialog units

c - a Component that provides the font and graphics

Returns:

the given horizontal dialog units as pixels

dialogUnitYAsPixel

public int dialogUnitYAsPixel(int dluY,
                              java.awt.Component c)

Converts vertical dialog units and returns pixels. Honors the resolution, dialog font size, platform, and l&f.

Specified by:

dialogUnitYAsPixel in interface UnitConverter

Parameters:

dluY - the vertical dialog units

c - a Component that provides the font and graphics

Returns:

the given vertical dialog units as pixels

getDialogBaseUnitsX

protected abstract double getDialogBaseUnitsX(java.awt.Component component)

Gets and returns the horizontal dialog base units. Implementations are encouraged to cache previously computed dialog base units.

Parameters:

component - a Component that provides the font and graphics

Returns:

the horizontal dialog base units

getDialogBaseUnitsY

protected abstract double getDialogBaseUnitsY(java.awt.Component component)

Gets and returns the vertical dialog base units. Implementations are encouraged to cache previously computed dialog base units.

Parameters:

component - a Component that provides the font and graphics

Returns:

the vertical dialog base units

inchAsPixel

protected final int inchAsPixel(double in,
                                int dpi)

Converts Inches and returns pixels using the specified resolution.

Parameters:

in - the Inches

dpi - the resolution

Returns:

the given Inches as pixels

millimeterAsPixel

protected final int millimeterAsPixel(double mm,
                                      int dpi)

Converts Millimeters and returns pixels using the specified resolution.

Parameters:

mm - Millimeters

dpi - the resolution

Returns:

the given Millimeters as pixels

centimeterAsPixel

protected final int centimeterAsPixel(double cm,
                                      int dpi)

Converts Centimeters and returns pixels using the specified resolution.

Parameters:

cm - Centimeters

dpi - the resolution

Returns:

the given Centimeters as pixels

pointAsPixel

protected final int pointAsPixel(int pt,
                                 int dpi)

Converts DTP Points and returns pixels using the specified resolution.

Parameters:

pt - DTP Points

dpi - the resolution in dpi

Returns:

the given Points as pixels

dialogUnitXAsPixel

protected int dialogUnitXAsPixel(int dluX,
                                 double dialogBaseUnitsX)

Converts horizontal dialog units and returns pixels.

Parameters:

dluX - the horizontal dialog units

dialogBaseUnitsX - the horizontal dialog base units

Returns:

the given dialog base units as pixels

dialogUnitYAsPixel

protected int dialogUnitYAsPixel(int dluY,
                                 double dialogBaseUnitsY)

Converts vertical dialog units and returns pixels.

Parameters:

dluY - the vertical dialog units

dialogBaseUnitsY - the vertical dialog base units

Returns:

the given dialog base units as pixels

computeAverageCharWidth

protected double computeAverageCharWidth(java.awt.FontMetrics metrics,
                                         java.lang.String testString)

Computes and returns the average character width of the specified test string using the given FontMetrics. The test string shall represent an "average" text.

Parameters:

metrics - used to compute the test string's width

testString - the string that shall represent an "average" text

Returns:

the test string's average character width.

getScreenResolution

protected int getScreenResolution(java.awt.Component c)

Returns the components screen resolution or the default screen resolution if the component is null or has no toolkit assigned yet.

Parameters:

c - the component to ask for a toolkit

Returns:

the component's screen resolution

getDefaultScreenResolution

protected int getDefaultScreenResolution()

Computes and returns the default resolution.

Returns:

the default screen resolution