/*
 *
 * This file is part of the iText (R) project.
    Copyright (c) 1998-2020 iText Group NV
 * Authors: Bruno Lowagie, Paulo Soares, et al.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License version 3
 * as published by the Free Software Foundation with the addition of the
 * following permission added to Section 15 as permitted in Section 7(a):
 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
 * ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
 * OF THIRD PARTY RIGHTS
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Affero General Public License for more details.
 * You should have received a copy of the GNU Affero General Public License
 * along with this program; if not, see http://www.gnu.org/licenses or write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA, 02110-1301 USA, or download the license from the following URL:
 * http://itextpdf.com/terms-of-use/
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License.
 *
 * In accordance with Section 7(b) of the GNU Affero General Public License,
 * a covered work must retain the producer line in every PDF that is created
 * or manipulated using iText.
 *
 * You can be released from the requirements of the license by purchasing
 * a commercial license. Buying such a license is mandatory as soon as you
 * develop commercial activities involving the iText software without
 * disclosing the source code of your own applications.
 * These activities include: offering paid services to customers as an ASP,
 * serving PDFs on the fly in a web application, shipping iText with a closed
 * source product.
 *
 * For more information, please contact iText Software Corp. at this
 * address: sales@itextpdf.com
 */
package com.itextpdf.text.pdf.draw;

import com.itextpdf.text.BaseColor;
import com.itextpdf.text.Element;
import com.itextpdf.text.Font;
import com.itextpdf.text.pdf.PdfChunk;
import com.itextpdf.text.pdf.PdfContentByte;

/**
 * Element that draws a solid line from left to right.
 * Can be added directly to a document or column.
 * Can also be used to create a separator chunk.
 * @author	Paulo Soares
 * @since	2.1.2
 */
public class LineSeparator extends VerticalPositionMark {
	
    /** The thickness of the line. */
    protected float lineWidth = 1;
    /** The width of the line as a percentage of the available page width. */
    protected float percentage = 100;
    /** The color of the line. */
    protected BaseColor lineColor;
    /** The alignment of the line. */
    protected int alignment = Element.ALIGN_BOTTOM;
    
    /**
     * Creates a new instance of the LineSeparator class.
     * @param lineWidth		the thickness of the line
     * @param percentage	the width of the line as a percentage of the available page width
     * @param lineColor			the color of the line
     * @param align			the alignment
     * @param offset		the offset of the line relative to the current baseline (negative = under the baseline)
     */
    public LineSeparator(float lineWidth, float percentage, BaseColor lineColor, int align, float offset) {
        this.lineWidth = lineWidth;
        this.percentage = percentage;
        this.lineColor = lineColor;
        this.alignment = align;
        this.offset = offset;
    }

    /**
     * Creates a new instance of the LineSeparator class.
     * @param font			the font
     */
    public LineSeparator(Font font) {
        this.lineWidth = PdfChunk.UNDERLINE_THICKNESS * font.getSize();
        this.offset = PdfChunk.UNDERLINE_OFFSET * font.getSize();
        this.percentage = 100;
        this.lineColor = font.getColor();
    }

    /**
     * Creates a new instance of the LineSeparator class with
     * default values: lineWidth 1 user unit, width 100%, centered with offset 0.
     */
    public LineSeparator() {
    }

    /**
     * @see com.itextpdf.text.pdf.draw.DrawInterface#draw(com.itextpdf.text.pdf.PdfContentByte, float, float, float, float, float)
     */
    public void draw(PdfContentByte canvas, float llx, float lly, float urx, float ury, float y) {
        canvas.saveState();
        drawLine(canvas, llx, urx, y);
        canvas.restoreState();
    }

    /**
     * Draws a horizontal line.
     * @param canvas	the canvas to draw on
     * @param leftX		the left x coordinate
     * @param rightX	the right x coordindate
     * @param y			the y coordinate
     */
    public void drawLine(PdfContentByte canvas, float leftX, float rightX, float y) {
    	float w;
        if (getPercentage() < 0)
            w = -getPercentage();
        else
            w = (rightX - leftX) * getPercentage() / 100.0f;
        float s;
        switch (getAlignment()) {
            case Element.ALIGN_LEFT:
                s = 0;
                break;
            case Element.ALIGN_RIGHT:
                s = rightX - leftX - w;
                break;
            default:
                s = (rightX - leftX - w) / 2;
                break;
        }
        canvas.setLineWidth(getLineWidth());
        if (getLineColor() != null)
            canvas.setColorStroke(getLineColor());
        canvas.moveTo(s + leftX, y + offset);
        canvas.lineTo(s + w + leftX, y + offset);
        canvas.stroke();
    }
    
    /**
     * Getter for the line width.
     * @return	the thickness of the line that will be drawn.
     */
    public float getLineWidth() {
        return lineWidth;
    }

    /**
     * Setter for the line width.
     * @param lineWidth	the thickness of the line that will be drawn.
     */
    public void setLineWidth(float lineWidth) {
        this.lineWidth = lineWidth;
    }

    /**
     * Setter for the width as a percentage of the available width.
     * @return	a width percentage
     */
    public float getPercentage() {
        return percentage;
    }

    /**
     * Setter for the width as a percentage of the available width.
     * @param percentage	a width percentage
     */
    public void setPercentage(float percentage) {
        this.percentage = percentage;
    }

    /**
     * Getter for the color of the line that will be drawn.
     * @return	a color
     */
    public BaseColor getLineColor() {
        return lineColor;
    }

    /**
     * Setter for the color of the line that will be drawn.
     * @param color	a color
     */
    public void setLineColor(BaseColor color) {
        this.lineColor = color;
    }

    /**
     * Getter for the alignment of the line.
     * @return	an alignment value
     */
    public int getAlignment() {
        return alignment;
    }

    /**
     * Setter for the alignment of the line.
     * @param align	an alignment value
     */
    public void setAlignment(int align) {
        this.alignment = align;
    }
}
