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The Apache Commons Codec package contains simple encoder and decoders for various formats such as Base64 and Hexadecimal. In addition to these widely used encoders and decoders, the codec package also maintains a collection of phonetic encoding utilities.

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/* ====================================================================
   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
   the License.  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
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package org.apache.poi.xdgf.usermodel.section.geometry;

import org.apache.poi.ooxml.POIXMLException;
import org.apache.poi.xdgf.usermodel.XDGFCell;
import org.apache.poi.xdgf.usermodel.XDGFShape;

import com.microsoft.schemas.office.visio.x2012.main.CellType;
import com.microsoft.schemas.office.visio.x2012.main.RowType;

/**
 * Contains the x- and y-coordinates of the endpoint of a quadratic Bezier curve
 * relative to the shape's width and height and the x- and y-coordinates of the
 * control point of the curve relative shape's width and height.
 */
public class RelQuadBezTo implements GeometryRow {

    RelQuadBezTo _master;

    // The x-coordinate of the ending vertex of a quadratic Bezier curve
    // relative to the width of the shape.
    Double x;

    // The y-coordinate of the ending vertex of a quadratic Bezier curve
    // relative to the height of the shape.
    Double y;

    // The x-coordinate of the curve's control point relative to the shape's
    // width; a point on the arc. The control point is best located about
    // halfway between the beginning and ending vertices of the arc.
    Double a;

    // The y-coordinate of a curve's control point relative to the shape's
    // height.
    Double b;

    Boolean deleted;

    // TODO: support formulas

    public RelQuadBezTo(RowType row) {

        if (row.isSetDel())
            deleted = row.getDel();

        for (CellType cell : row.getCellArray()) {
            String cellName = cell.getN();

            if (cellName.equals("X")) {
                x = XDGFCell.parseDoubleValue(cell);
            } else if (cellName.equals("Y")) {
                y = XDGFCell.parseDoubleValue(cell);
            } else if (cellName.equals("A")) {
                a = XDGFCell.parseDoubleValue(cell);
            } else if (cellName.equals("B")) {
                b = XDGFCell.parseDoubleValue(cell);
            } else {
                throw new POIXMLException("Invalid cell '" + cellName
                        + "' in RelQuadBezTo row");
            }
        }
    }

    public boolean getDel() {
        if (deleted != null)
            return deleted;

        return _master != null && _master.getDel();
    }

    public Double getX() {
        return x == null ? _master.x : x;
    }

    public Double getY() {
        return y == null ? _master.y : y;
    }

    public Double getA() {
        return a == null ? _master.a : a;
    }

    public Double getB() {
        return b == null ? _master.b : b;
    }

    @Override
    public void setupMaster(GeometryRow row) {
        _master = (RelQuadBezTo) row;
    }

    @Override
    public void addToPath(java.awt.geom.Path2D.Double path, XDGFShape parent) {

        if (getDel())
            return;

        double w = parent.getWidth();
        double h = parent.getHeight();

        path.quadTo(getA() * w, getB() * h, getX() * w, getY() * h);
    }
}