Package de.erichseifert.vectorgraphics2d.util

Class 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.

    • Constructor Summary

      Constructors 
      Constructor Description
      GraphicsUtils()
      Default constructor that prevents creation of class.

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method 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.
      private static boolean isLogicalFontFamily​(java.lang.String family)  
      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

    • Field Detail

      • FONT_RENDER_CONTEXT

        private static final java.awt.font.FontRenderContext FONT_RENDER_CONTEXT

      • FONT_TEST_STRING

        private static final java.lang.String FONT_TEST_STRING
        See Also:
        Constant Field Values

    • Constructor Detail

      • GraphicsUtils

        GraphicsUtils()
        Default constructor that prevents creation of class.

    • 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)

      • isLogicalFontFamily

        private static boolean isLogicalFontFamily​(java.lang.String family)

      • 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)