colorpattern.java

Java生成PDF Java生成PDF Java生成PDF

// $Id: ColorPattern.java,v 1.5 2003/11/04 17:16:01 mike Exp $

package org.faceless.pdf;

import java.awt.*;

/**
 * <p>
 * A ColorPattern is a subclass of <code>Paint</code> that can be used with
 * this library to fill shapes with a pattern. Currently the patterns must be
 * chosen from a list of predefined patterns, and are limited to two colors
 * (although this may change in future versions of the library). Prior to
 * version 1.2 of the library, this class was a subclass of <code>java.awt.Color</code>.
 * Here's an example.
 * </p>
 * <pre>
 *   PDFStyle style = new PDFStyle();
 *   ColorPattern c = ColorPattern.star(Color.red, Color.blue, 20);
 *   style.setFillColor(c);
 *   page.setStyle(style);
 *   page.drawRectangle(100,100, 200,200);
 * </pre>
 * This will draw a rectangle filled with red stars on a blue background.
 * @since 1.1
 */
public class ColorPattern extends PeeredObject implements Paint, Cloneable
{
    final org.faceless.pdf2.PDFPattern pattern; 

    Object getPeer()
    {
        return pattern;
    }

    ColorPattern(org.faceless.pdf2.PDFPattern pattern)
    {
        this.pattern=pattern;
    }

    /**
     * Create a new ColorPattern consisting of parallel stripes.
     * @param background the background color of the pattern
     * @param foreground the foreground color of the pattern
     * @param on the width of each stripe, in points
     * @param off the width of the space between each stripe, in points
     * @param angle the angle of the stripe in degrees clockwise, with 0 at 12 o'clock
     */
    public static ColorPattern stripe(Color background, Color foreground, float on, float off, float angle)
    {
	return new ColorPattern(new org.faceless.pdf2.PDFPattern("Stripe"+((int)angle), 0, 0, on, off, foreground, background));
    }

    /**
     * Create a new ColorPattern resembling a brick wall (specifically, a brick
     * wall with a running pattern bond).
     * @param background the background color of the pattern
     * @param foreground the foreground color of the pattern
     * @param width the width of each brick, in points
     * @param height the height of each brick, in points
     */
    public static ColorPattern brick(Color background, Color foreground, float width, float height)
    {
	return new ColorPattern(new org.faceless.pdf2.PDFPattern("Brick", 0, 0, width, height*2, foreground, background));
    }

    /**
     * Create a new ColorPattern with a simple check pattern.
     * @param background the background color of the pattern
     * @param foreground the foreground color of the pattern
     * @param size the width and height of each check, in points
     */
    public static ColorPattern check(Color background, Color foreground, float size)
    {
	return new ColorPattern(new org.faceless.pdf2.PDFPattern("Check", 0, 0, size*2, size*2, foreground, background));
    }

    /**
     * Create a new ColorPattern with a simple grid pattern.
     * @param background the background color of the pattern
     * @param foreground the foreground color of the pattern
     * @param on the thickness of each line on the grid, in points
     * @param off the distance between each line on the grid, in points
     */
    public static ColorPattern grid(Color background, Color foreground, float on, float off)
    {
	return new ColorPattern(new org.faceless.pdf2.PDFPattern("Grid", 0, 0, on+off, on+off, background, foreground));
    }

    /**
     * Create a new ColorPattern with a spot pattern, similar to that used in
     * halftoning patterns in newspapers.
     * @param background the background color of the pattern
     * @param foreground the foreground color of the pattern
     * @param size the radius of each spot
     */
    public static ColorPattern spot(Color background, Color foreground, float size)
    {
	return new ColorPattern(new org.faceless.pdf2.PDFPattern("Spot", 0, 0, size*2, size*2, foreground, background));
    }

    /**
     * Create a new ColorPattern with a polka dot pattern of random spots.
     * @param background the background color of the pattern
     * @param foreground the foreground color of the pattern
     * @param size The size of the pattern in points. Each spot is between 10% and
     * 20% of this size.
     */
    public static ColorPattern polka(Color background, Color foreground, float size)
    {
	return new ColorPattern(new org.faceless.pdf2.PDFPattern("Polka", 0, 0, size*2, size*2, foreground, background));
    }

    /**
     * Create a new ColorPattern with a five-pointed star pattern, like that on
     * the US flag.
     * @param background the background color of the pattern
     * @param foreground the foreground color of the pattern
     * @param size the size of each star, in points
     */
    public static ColorPattern star(Color background, Color foreground, float size)
    {
	return new ColorPattern(new org.faceless.pdf2.PDFPattern("Star", 0, 0, size*2, size*2, foreground, background));
    }

    /**
     * Return a copy of this ColorPattern with the brightness adjusted.
     * Prior to version 1.2 this method adjusted the color inline and
     * returned <code>void</code>.
     *
     * @param delta the amount to add the the brightness. The value
     * should be between -1 and 1
     * @param min the minimum allowable level of brightness. May
     * be between 0 and 1
     * @param max the maximum allowable level of brightness. May
     * be between 0 and 1
     */
    public ColorPattern adjustBrightness(float delta, float min, float max)
    {
	return (ColorPattern)PeeredObject.getPeer(pattern.brightnessClone(delta,min,max));
    }

    public Object clone()
    {
//	return (ColorPattern)PeeredObject.getPeer(pattern.clone());	//TODO
	throw new Error("Not implemented");
    }

    public int getTransparency()
    {
	return pattern.getTransparency();
    }

    /**
     * As this method is intended for AWT use only, it is not implemented
     * and will throw an <code>UnsupportedOperationException</code> if called
     */
    public PaintContext createContext(java.awt.image.ColorModel cm, Rectangle deviceBounds, java.awt.geom.Rectangle2D userBounds, java.awt.geom.AffineTransform xform, RenderingHints hints)
    {
        throw new UnsupportedOperationException("createContext not appropriate for ColorPattern");
    }


    /**
     *  Return the background color of the pattern
     */
    public Color getBackgroundColor()
    {
        return null;
    }

    /**
     *  Return the foreground color of the pattern
     */
    public Color getForegroundColor()
    {
        return null;
    }
}