BN089-BS开发框架MVC4版/source20131023/Zephyr.Net/Zephyr.Utils/Document/Excel/NPOI/HSSF/UserModel/EscherGraphics.cs

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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
   limitations Under the License.
==================================================================== */

namespace Zephyr.Utils.NPOI.HSSF.UserModel
{
    using System;
    using Zephyr.Utils.NPOI.HSSF.Util;
    using Zephyr.Utils.NPOI.Util;
    using System.Text;

    using System.Drawing;
    using Zephyr.Utils.NPOI.SS.UserModel;

    /**
     * Translates Graphics calls into escher calls.  The translation Is lossy so
     * many features are not supported and some just aren't implemented yet.  If
     * in doubt test the specific calls you wish to make. Graphics calls are
     * always performed into an EscherGroup so one will need to be Created.
     * 
     * <b>Important:</b>
     * <blockquote>
     * One important concept worth considering Is that of font size.  One of the
     * difficulties in Converting Graphics calls into escher Drawing calls Is that
     * Excel does not have the concept of absolute pixel positions.  It measures
     * it's cell widths in 'Chars' and the cell heights in points.
     * Unfortunately it's not defined exactly what a type of Char it's
     * measuring.  Presumably this Is due to the fact that the Excel will be
     * using different fonts on different platforms or even within the same
     * platform.
     * 
     * Because of this constraint we've had to calculate the
     * verticalPointsPerPixel.  This the amount the font should be scaled by when
     * you Issue commands such as DrawString().  A good way to calculate this
     * Is to use the follow formula:
     * 
     * <pre>
     *      multipler = GroupHeightInPoints / heightOfGroup
     * </pre>
     * 
     * The height of the Group Is calculated fairly simply by calculating the
     * difference between the y coordinates of the bounding box of the shape.  The
     * height of the Group can be calculated by using a convenience called
     * <c>HSSFClientAnchor.GetAnchorHeightInPoints()</c>.
     * </blockquote>
     *
     * @author Glen Stampoultzis (glens at apache.org)