graphicsoutput.java

这是个国外JAVA爱好者写的条形码生成器

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 * All rights reserved.
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 *
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package net.sourceforge.barbecue.output;

import java.awt.*;
import java.awt.font.TextLayout;

/**
 * Graphics based outputter to draw barcodes to Graphics objects for printing
 * and display.
 *
 * @author Ryan Martell
 * @author <a href="mailto:[e-mail]">Ian Bourke</a>
 */
public class GraphicsOutput extends AbstractOutput {

	private final Graphics2D g;
    private Color savedColour;
    
    /**
     * Creates a Graphics2D AbstractOutput
     * @param graphics The graphics to output to
     * @param font The font for text rendering
     * @param fgColor Foreground Color
     * @param bgColor Background Color
     */
    public GraphicsOutput(Graphics2D graphics, Font font, Color fgColor, Color bgColor) {
        super(font, true, 1.0, fgColor, bgColor);
        this.g = graphics;
    }
    
    /**
     * From AbstractOutput - Saves current colour.
     */
    public void beginDraw() {
        savedColour = g.getColor();
    }
    
    /**
     * From AbstractOutput - Restores colour.
     * @param width The output width (in pixels) of the barcode
     * @param height The output height (in pixels) of the barcode
     */
    public void endDraw(int width, int height) {
        g.setColor(savedColour);
    }
    
    /**
     * From AbstractOutput - Draws a bar at the given coordinates onto the output Graphics.
     * @param x the x coordinate
     * @param y the y coordinate
     * @param width the width
     * @param height the height
     * @param paintWithForegroundColor if true, use the foreground color, otherwise use the background color
     */
    public int drawBar(int x, int y, int width, int height, boolean paintWithForegroundColor) {
        if (painting) {
            if (paintWithForegroundColor) {
                g.setColor(this.foregroundColour);
            } else {
                g.setColor(this.backgroundColour);
            }
            
            g.fillRect((int) (scalar * x), (int) (scalar * y),
            (int) (scalar * width), (int) (scalar * height));
        }
        
        return width;
    }

	public int drawText(String text, LabelLayout labelLayout) throws OutputException {
		if(font == null) {
            return 0;
        } else {
			TextLayout layout = new TextLayout(text, font, g.getFontRenderContext());
			labelLayout.setTextLayout(layout);

			if (painting) {
                g.setColor(backgroundColour);
                g.fillRect(labelLayout.getBackgroundX(), labelLayout.getBackgroundY(), labelLayout.getBackgroundWidth(), labelLayout.getBackgroundHeight());
                g.setColor(foregroundColour);
                layout.draw(g, labelLayout.getTextX(), labelLayout.getTextY());
            }

            return labelLayout.getBackgroundHeight();
		}
	}

	/**
     * Paint the background the background colour, based on the height and the width.
     * @param x the x coordinate
     * @param y the y coordinate
     * @param width the width to be painted
     * @param height the height to be painted
     */
    public void paintBackground(int x, int y, int width, int height) {
        if(!painting) {
            return;
        }
        g.setColor(backgroundColour);
        g.fillRect(x, y, width, height);
    }
    
}