/*

  * Copyright 2007 - 2007 JEuclid, http://jeuclid.sf.net

  * 

  * Licensed 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.

  */

 /* $Id: GraphicsSupport.java,v 86b5e673f9b8 2008/06/24 08:01:00 maxberger $ */

 package net.sourceforge.jeuclid.elements.support;

 import net.sourceforge.jeuclid.Constants;

 import net.sourceforge.jeuclid.LayoutContext;

 import net.sourceforge.jeuclid.context.Parameter;

 /**

  * This class contains helper functions for graphical calculations.

  * 

  * @version $Revision: 86b5e673f9b8 $

  */

 public final class GraphicsSupport {

     /** Minimum line width. */

     public static final float MIN_LINEWIDTH = 1.0f;

     private GraphicsSupport() {

         // Empty on purpose.

     }

     /**

      * Gets the size of the actual font used (including scriptsizemultiplier).

      * 

      * @param context

      *            Layout context to use.

      * @return size of the current font.

      */

     public static float getFontsizeInPoint(final LayoutContext context) {

         final float scriptMultiplier = (float) Math.pow((Float) context

                 .getParameter(Parameter.SCRIPTSIZEMULTIPLIER),

                 (Integer) context.getParameter(Parameter.SCRIPTLEVEL));

         final float mathsize = (Float) context

                 .getParameter(Parameter.MATHSIZE);

         final float scriptminsize = (Float) context

                 .getParameter(Parameter.SCRIPTMINSIZE);

         final float scriptsize = mathsize * scriptMultiplier;

         return Math.max(Math.min(scriptminsize, mathsize), scriptsize);

     }

     /**

      * Retrieve the width of a line that would be 1pt if unscaled.

      * 

      * @param context

      *            Layout context to use.

      * @return line width as float, at least {@link #MIN_LINEWIDTH}

      */

     public static float lineWidth(final LayoutContext context) {

         float lineSize = GraphicsSupport.getFontsizeInPoint(context)

                 / Constants.DEFAULT_FONTSIZE;

         if (lineSize < GraphicsSupport.MIN_LINEWIDTH) {

             lineSize = GraphicsSupport.MIN_LINEWIDTH;

         }

         return lineSize;

     }

 }