de.erichseifert.vectorgraphics2d.util

Class GraphicsUtils

java.lang.Object

de.erichseifert.vectorgraphics2d.util.GraphicsUtils

public abstract class GraphicsUtils
extends java.lang.Object

Abstract class that contains utility functions for working with graphics. For example, this includes font handling.

Method Summary

Modifier and Type	Method and Description
static java.awt.Shape	clone(java.awt.Shape shape)
static boolean	equals(java.awt.Shape shapeA, java.awt.Shape shapeB)
static java.awt.image.BufferedImage	getAlphaImage(java.awt.image.BufferedImage image)
static java.awt.Font	getPhysicalFont(java.awt.Font logicalFont)
static java.awt.Font	getPhysicalFont(java.awt.Font logicalFont, java.lang.String testText) Try to guess physical font from the properties of a logical font, like "Dialog", "Serif", "Monospaced" etc.
static boolean	hasAlpha(java.awt.Image image) This method returns true if the specified image has the possibility to store transparent pixels.
static java.awt.image.BufferedImage	toBufferedImage(java.awt.Image image) This method returns a buffered image with the contents of an image.
static java.awt.image.BufferedImage	toBufferedImage(java.awt.image.RenderedImage image) Converts a rendered image instance to a BufferedImage.
static boolean	usesAlpha(java.awt.Image image) This method returns true if the specified image has at least one pixel that is not fully opaque.

Methods inherited from class java.lang.Object

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

Method Detail

hasAlpha

public static boolean hasAlpha(java.awt.Image image)

This method returns true if the specified image has the possibility to store transparent pixels. Inspired by http://www.exampledepot.com/egs/java.awt.image/HasAlpha.html

Parameters:

image - Image that should be checked for alpha channel.

Returns:

true if the specified image can have transparent pixels, false otherwise

usesAlpha

public static boolean usesAlpha(java.awt.Image image)

This method returns true if the specified image has at least one pixel that is not fully opaque.

Parameters:

image - Image that should be checked for non-opaque pixels.

Returns:

true if the specified image has transparent pixels, false otherwise

toBufferedImage

public static java.awt.image.BufferedImage toBufferedImage(java.awt.image.RenderedImage image)

Converts a rendered image instance to a BufferedImage.

Parameters:

image - Rendered image that should be converted.

Returns:

a buffered image containing the image pixels, or the original instance if the image already was of type BufferedImage.

toBufferedImage

public static java.awt.image.BufferedImage toBufferedImage(java.awt.Image image)

This method returns a buffered image with the contents of an image. Taken from http://www.exampledepot.com/egs/java.awt.image/Image2Buf.html

Parameters:

image - Image to be converted

Returns:

a buffered image with the contents of the specified image

clone

public static java.awt.Shape clone(java.awt.Shape shape)

getPhysicalFont

public static java.awt.Font getPhysicalFont(java.awt.Font logicalFont,
                                            java.lang.String testText)

Try to guess physical font from the properties of a logical font, like "Dialog", "Serif", "Monospaced" etc.

Parameters:

logicalFont - Logical font object.

testText - Text used to determine font properties.

Returns:

An object of the first matching physical font. The original font object is returned if it was a physical font or no font matched.

getPhysicalFont

public static java.awt.Font getPhysicalFont(java.awt.Font logicalFont)

getAlphaImage

public static java.awt.image.BufferedImage getAlphaImage(java.awt.image.BufferedImage image)

equals

public static boolean equals(java.awt.Shape shapeA,
                             java.awt.Shape shapeB)