com.pnuema.java.barcode.Labels Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of barcode Show documentation
Barcode image generation library in Java
The newest version!
package com.pnuema.java.barcode;

import java.awt.*;
import java.awt.image.BufferedImage;

/**
 * Class to draw labels for differing barcode types
 */
@SuppressWarnings("DuplicatedCode")
class Labels {
    public enum LabelPositions {TOP, BOTTOM}

    /**
     * Draws Label for ITF-14 barcodes
     * @param Barcode Barcode to draw the label for
     * @param img Image representation of the barcode without the labels
     * @return Image representation of the barcode with labels applied
     */
    public static Image Label_ITF14(Barcode Barcode, BufferedImage img) {
        try
        {
            Font font = Barcode.getLabelFont();

            Graphics2D g = img.createGraphics();
            g.drawImage(img, 0, 0, null);

            RenderingHints rh = new RenderingHints(
                    RenderingHints.KEY_TEXT_ANTIALIASING,
                    RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
            g.setRenderingHints(rh);

            g.setColor(Barcode.getBackColor());
            //color a background color box at the bottom of the barcode to hold the string of data
            Rectangle rect = new Rectangle(0, img.getHeight() - (font.getSize() - 2), img.getWidth(), font.getSize());
            g.drawRect((int)rect.getX(), (int)rect.getY(), (int)rect.getWidth(), (int)rect.getHeight());

            //draw datastring under the barcode image
            g.setColor(Barcode.getForeColor());
            String text = Barcode.getAlternateLabel() == null ? Barcode.getRawData() : Barcode.getAlternateLabel();
            drawCenteredString(g, text, rect, font);

            float lineThickness = (float)img.getHeight() / 16;
            g.drawRect(0, img.getHeight() - font.getSize() - 2 - ((int)lineThickness / 2), img.getWidth(), img.getHeight() - font.getSize() - 2 + ((int)lineThickness/2));

            g.dispose();

            return img;
        }
        catch (Exception ex) {
            throw new RuntimeException("ELABEL_ITF14-1: " + ex.getMessage());
        }
    }

    /**
     * Draws Label for Generic barcodes
     * @param Barcode Barcode to draw the label for
     * @param img Image representation of the barcode to which the label will be applied
     */
    static void labelGeneric(Barcode Barcode, BufferedImage img) {
        try {
            Font font = Barcode.getLabelFont();

            Graphics2D g = img.createGraphics();
            g.drawImage(img, 0, 0, null);

            RenderingHints rh = new RenderingHints(
                    RenderingHints.KEY_TEXT_ANTIALIASING,
                    RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
            g.setRenderingHints(rh);

            int LabelY = 0;

            //noinspection SwitchStatementWithTooFewBranches
            switch (Barcode.getLabelPosition()) {
                case BOTTOM:
                    LabelY = img.getHeight() - (font.getSize());
                    break;
            }//switch

            //color a background color box at the bottom of the barcode to hold the string of data
            g.setColor(Barcode.getBackColor());
            g.fillRect(0, LabelY, img.getWidth(), font.getSize());

            //draw datastring under the barcode image
            g.setColor(Barcode.getForeColor());
            Rectangle rect = new Rectangle(0, LabelY, img.getWidth(), font.getSize());
            drawCenteredString(g, Barcode.getAlternateLabel() == null ? Barcode.getRawData() : Barcode.getAlternateLabel(), rect, font);

            g.dispose();
        } catch (Exception ex) {
            throw new RuntimeException("ELABEL_GENERIC-1: " + ex.getMessage());
        }
    }

    /**
     * Draws Label for EAN-13 barcodes
     * @param Barcode Barcode to draw the label for
     * @param img Image representation of the barcode to which the label will be applied
     */
    static void Label_EAN13(Barcode Barcode, BufferedImage img) {
        try {
            int iBarWidth = Barcode.getWidth() / Barcode.getEncodedValue().length();
            String defTxt = Barcode.getRawData();

            int fontSize = getFontsize(Barcode.getWidth() - Barcode.getWidth() % Barcode.getEncodedValue().length(), img.getHeight(), defTxt);
            Font labFont = new Font("Serif", Font.PLAIN, fontSize);
            Font smallFont = new Font(labFont.getFamily(), labFont.getStyle(), (int)(fontSize * 0.5f));

            int shiftAdjustment = getShiftAdjustment(Barcode);

            Graphics2D g = img.createGraphics();
            g.drawImage(img, 0, 0, null);

            RenderingHints rh = new RenderingHints(
                    RenderingHints.KEY_TEXT_ANTIALIASING,
                    RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
            g.setRenderingHints(rh);

            int LabelY;

            //Default alignment for EAN13
            LabelY = img.getHeight() - labFont.getSize();

            float w1 = iBarWidth * 4; //Width of first block
            float w2 = iBarWidth * 42; //Width of second block
            float w3 = iBarWidth * 42; //Width of third block

            float s1 = shiftAdjustment - iBarWidth;
            float s2 = s1 + (iBarWidth * 4); //Start position of block 2
            float s3 = s2 + w2 + (iBarWidth * 5); //Start position of block 3

            //Draw the background rectangles for each block
            g.setColor(Barcode.getBackColor());
            g.drawRect((int)s2, LabelY, (int) w2, labFont.getSize());
            g.drawRect((int)s3, LabelY, (int) w3, labFont.getSize());

            //draw datastring under the barcode image
            g.setColor(Barcode.getForeColor());
            g.drawString(defTxt.substring(0, 1), s1, (float)img.getHeight() - (float)(smallFont.getSize() * 0.9));
            g.drawString(defTxt.substring(1, 6), s2, (float)LabelY);
            g.drawString(defTxt.substring(7), s3 - iBarWidth, (float)LabelY);

            g.dispose();
        } catch (Exception ex) {
            throw new IllegalArgumentException("ELABEL_EAN13-1: " + ex.getMessage());
        }
    }

    /**
     * Draws Label for UPC-A barcodes
     * @param Barcode Barcode to draw the label for
     * @param img Image representation of the barcode to which the label will be applied
     */
    public static void Label_UPCA(Barcode Barcode, BufferedImage img) {
        try {
            int iBarWidth = Barcode.getWidth() / Barcode.getEncodedValue().length();
            int halfBarWidth = (int)(iBarWidth * 0.5);
            String defTxt = Barcode.getRawData();

            int fontSize = getFontsize((int)((Barcode.getWidth() - Barcode.getWidth() % Barcode.getEncodedValue().length()) * 0.9f), img.getHeight(), defTxt);
            Font labFont = new Font("Serif", Font.PLAIN, fontSize);
            Font smallFont = new Font(labFont.getFamily(), labFont.getStyle(), (int)(fontSize * 0.5f));

            int shiftAdjustment = getShiftAdjustment(Barcode);

            Graphics2D g = img.createGraphics();
            g.drawImage(img, 0, 0, null);

            RenderingHints rh = new RenderingHints(
                    RenderingHints.KEY_TEXT_ANTIALIASING,
                    RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
            g.setRenderingHints(rh);

            int LabelY;

            //Default alignment for UPCA
            LabelY = img.getHeight() - labFont.getSize();

            float w1 = iBarWidth * 4; //Width of first block
            float w2 = iBarWidth * 34; //Width of second block
            float w3 = iBarWidth * 34; //Width of third block

            float s1 = shiftAdjustment - iBarWidth;
            float s2 = s1 + (iBarWidth * 12); //Start position of block 2
            float s3 = s2 + w2 + (iBarWidth * 5); //Start position of block 3
            float s4 = s3 + w3 + (iBarWidth * 8) - halfBarWidth;

            //Draw the background rectangles for each block
            g.setColor(Barcode.getBackColor());
            g.drawRect((int)s2, LabelY, (int) w2, labFont.getSize());
            g.drawRect((int)s3, LabelY, (int) w3, labFont.getSize());

            //draw data string under the barcode image
            g.setColor(Barcode.getForeColor());
            g.drawString(defTxt.substring(0, 1), s1, (float)img.getHeight() - smallFont.getSize());
            g.drawString(defTxt.substring(1, 5), s2 - iBarWidth, (float)LabelY);
            g.drawString(defTxt.substring(6, 11), s3 - iBarWidth, (float)LabelY);
            g.drawString(defTxt.substring(11), s4, img.getHeight() - smallFont.getSize());

            g.dispose();
        } catch (Exception ex) {
            throw new RuntimeException("ELABEL_UPCA-1: " + ex.getMessage());
        }
    }

    public static int getFontsize(int wid, int hgt, String lbl) {
        //Returns the optimal font size for the specified dimensions
        int fontSize = 10;

        if (!lbl.isEmpty()) {
            BufferedImage fakeImage = new BufferedImage(1, 1, BufferedImage.TYPE_INT_ARGB); //As we cannot use CreateGraphics() in a class library, so the fake image is used to load the Graphics.

            Graphics g = fakeImage.createGraphics();

            for (int i = 1; i <= 100; i++) {
                // See how much space the text would
                // need, specifying a maximum width.

                int text_size = g.getFontMetrics().stringWidth(lbl);
                if ((text_size > wid) || (text_size > hgt)) {
                    fontSize = i - 1;
                    break;
                }
            }

            g.dispose();
        }

        return fontSize;
    }

    /**
     * Draw a String centered in the middle of a Rectangle.
     *
     * @param g The Graphics instance.
     * @param text The String to draw.
     * @param rect The Rectangle to center the text in.
     */
    public static void drawCenteredString(Graphics g, String text, Rectangle rect, Font font) {
        // Get the FontMetrics
        FontMetrics metrics = g.getFontMetrics(font);
        // Determine the X coordinate for the text
        int x = rect.x + (rect.width - metrics.stringWidth(text)) / 2;
        // Determine the Y coordinate for the text (note we add the ascent, as in java 2d 0 is top of the screen)
        int y = rect.y + ((rect.height - metrics.getHeight()) / 2) + metrics.getAscent();
        // Set the font
        g.setFont(font);
        // Draw the String
        g.drawString(text, x, y);
    }

    private static int getShiftAdjustment(Barcode barcode) {
        switch (barcode.getAlignmentPosition()) {
            case LEFT:
                return 0;
            case RIGHT:
                return (barcode.getWidth() % barcode.getEncodedValue().length());
            case CENTER:
            default:
                return (barcode.getWidth() % barcode.getEncodedValue().length()) / 2;
        }
    }
}