Creates a new Stroke-Object for the given type and with. : Shape « 2D Graphics GUI « Java






  1. Java
  2. 2D Graphics GUI
  3. Shape

Creates a new Stroke-Object for the given type and with.

    
/**
 * 
 * JFreeReport : a free Java reporting library
 * 
 *
 * Project Info:  http://reporting.pentaho.org/
 *
 * (C) Copyright 2001-2007, by Object Refinery Ltd, Pentaho Corporation and Contributors.
 *
 * This library is free software; you can redistribute it and/or modify it under the terms
 * of the GNU Lesser General Public License as published by the Free Software Foundation;
 * either version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this
 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
 * in the United States and other countries.]
 *
 * ------------
 * StrokeUtility.java
 * ------------
 * (C) Copyright 2001-2007, by Object Refinery Ltd, Pentaho Corporation and Contributors.
 */
import java.awt.BasicStroke;
import java.awt.Stroke;
import java.util.Arrays;

/**
 * This class provides helper methods to work with Strokes and line-styles.
 * 
 * @author Thomas Morgner
 */
public class StrokeUtility {
  /** A constant defining a stroke-type. */
  public static final int STROKE_SOLID = 0;

  /** A constant defining a stroke-type. */
  public static final int STROKE_DASHED = 1;

  /** A constant defining a stroke-type. */
  public static final int STROKE_DOTTED = 2;

  /** A constant defining a stroke-type. */
  public static final int STROKE_DOT_DASH = 3;

  /** A constant defining a stroke-type. */
  public static final int STROKE_DOT_DOT_DASH = 4;

  /** A constant defining a stroke-type. */
  public static final int STROKE_NONE = 5;

  /**
   * Default Constructor. Private to prevent Object-creation.
   */
  private StrokeUtility() {
  }

  /**
   * Creates a new Stroke-Object for the given type and with.
   * 
   * @param type
   *          the stroke-type. (Must be one of the constants defined in this
   *          class.)
   * @param width
   *          the stroke's width.
   * @return the stroke, never null.
   */
  public static Stroke createStroke(final int type, final float width) {

    final boolean useWidthForStrokes = true;

    final float effectiveWidth;
    if (useWidthForStrokes) {
      effectiveWidth = width;
    } else {
      effectiveWidth = 1;
    }

    switch (type) {
    case STROKE_DASHED:
      return new BasicStroke(width, BasicStroke.CAP_SQUARE, BasicStroke.JOIN_MITER, 10.0f,
          new float[] { 6 * effectiveWidth, 6 * effectiveWidth }, 0.0f);
    case STROKE_DOTTED:
      return new BasicStroke(width, BasicStroke.CAP_SQUARE, BasicStroke.JOIN_MITER, 5.0f,
          new float[] { 0.0f, 2 * effectiveWidth }, 0.0f);
    case STROKE_DOT_DASH:
      return new BasicStroke(width, BasicStroke.CAP_SQUARE, BasicStroke.JOIN_MITER, 10.0f,
          new float[] { 0, 2 * effectiveWidth, 6 * effectiveWidth, 2 * effectiveWidth }, 0.0f);
    case STROKE_DOT_DOT_DASH:
      return new BasicStroke(width, BasicStroke.CAP_SQUARE, BasicStroke.JOIN_MITER, 10.0f,
          new float[] { 0, 2 * effectiveWidth, 0, 2 * effectiveWidth, 6 * effectiveWidth,
              2 * effectiveWidth }, 0.0f);
    default:
      return new BasicStroke(width);
    }
  }

  /**
   * Tries to extract the stroke-width from the given stroke object.
   * 
   * @param s
   *          the stroke.
   * @return the stroke's width.
   */
  public static float getStrokeWidth(final Stroke s) {
    if (s instanceof BasicStroke) {
      final BasicStroke bs = (BasicStroke) s;
      return bs.getLineWidth();
    }
    return 1;
  }

  /**
   * Tries to deduct the stroke-type from the given stroke object. This will
   * result in funny return values if the stroke was not created by the
   * {@link #createStroke(int, float)} method.
   * 
   * @param s
   *          the stroke.
   * @return the stroke's width.
   */
  public static int getStrokeType(final Stroke s) {
    if (s instanceof BasicStroke == false) {
      return STROKE_SOLID;
    }
    final BasicStroke bs = (BasicStroke) s;
    if (bs.getLineWidth() <= 0) {
      return STROKE_NONE;
    }

    final float[] dashes = bs.getDashArray();
    if (dashes == null) {
      return STROKE_SOLID;
    }
    if (dashes.length < 2) {
      return STROKE_SOLID;
    }
    if (dashes.length == 3 || dashes.length == 5) {
      return STROKE_SOLID;
    }

    if (dashes.length == 2) {
      // maybe dashed or dotted ...
      // if (dashes[0] < 2 && dashes[1] < 2) {
      // return STROKE_DOTTED;
      // }
      final float factor = dashes[0] / dashes[1];
      if (factor > 0.9 && factor < 1.1) {
        return STROKE_DASHED;
      } else if (factor < 0.1) {
        return STROKE_DOTTED;
      }

      // else ... not recognized ...
      return STROKE_SOLID;
    } else if (dashes.length == 4) {
      // maybe a dot-dashed stroke ...
      final float[] copyDashes = (float[]) dashes.clone();
      Arrays.sort(copyDashes);

      // the first value should be near zero ..
      if (Math.abs(copyDashes[0] / bs.getLineWidth()) > 0.5) {
        // not recognized ..
        return STROKE_SOLID;
      }

      // test that the first two values have the same size
      final float factor1 = (2 * bs.getLineWidth()) / copyDashes[1];
      final float factor2 = (2 * bs.getLineWidth()) / copyDashes[2];
      final float factorBig = (2 * bs.getLineWidth()) / copyDashes[3];

      if ((factor1 < 0.9 || factor1 > 1.1) || (factor2 < 0.9 || factor2 > 1.1)) {
        // not recognized ...
        return STROKE_SOLID;
      }

      if (factorBig < 0.4 || factorBig > 2.5) {
        return STROKE_DOT_DASH;
      }
      if (factorBig < 0.9 || factorBig > 1.1) {
        return STROKE_DOTTED;
      }
      return STROKE_DASHED;
    } else if (dashes.length == 6) {
      // maybe a dot-dashed stroke ...
      final float[] copyDashes = (float[]) dashes.clone();
      Arrays.sort(copyDashes);
      // test that the first three values have the same size

      // the first two values should be near zero ..
      if (Math.abs(copyDashes[0] / bs.getLineWidth()) > 0.5) {
        // not recognized ..
        return STROKE_SOLID;
      }
      if (Math.abs(copyDashes[1] / bs.getLineWidth()) > 0.5) {
        // not recognized ..
        return STROKE_SOLID;
      }

      final float factor2 = (2 * bs.getLineWidth()) / copyDashes[2];
      final float factor3 = (2 * bs.getLineWidth()) / copyDashes[3];
      final float factor4 = (2 * bs.getLineWidth()) / copyDashes[4];
      final float factorBig = (2 * bs.getLineWidth()) / copyDashes[5];

      if ((factor2 < 0.9 || factor2 > 1.1) || (factor3 < 0.9 || factor3 > 1.1)
          || (factor4 < 0.9 || factor4 > 1.1)) {
        return STROKE_SOLID;
      }

      if (factorBig < 0.4 || factorBig > 2.5) {
        return STROKE_DOT_DOT_DASH;
      }
      if ((factorBig < 0.9 || factorBig > 1.1)) {
        return STROKE_DOTTED;
      }
      return STROKE_DASHED;
    }
    // not recognized ...
    return STROKE_SOLID;
  }
}








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