cancel the effects of the zoom on a particular Stroke. - Java 2D Graphics

Java examples for 2D Graphics:Stroke

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Description

cancel the effects of the zoom on a particular Stroke.

Demo Code

/*******************************************************************************
 * Copyright (C) 2005 - 2014 TIBCO Software Inc. All rights reserved.
 * http://www.jaspersoft.com.// www .j a  va 2s  .com
 * 
 * Unless you have purchased  a commercial license agreement from Jaspersoft,
 * the following license terms  apply:
 * 
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 ******************************************************************************/
//package com.java2s;
import java.awt.BasicStroke;
import java.awt.Stroke;

public class Main {
    /**
     * This function provides a way to cancel the effects of the zoom on a particular Stroke. All the stroke values (as
     * line width, dashes, etc...) are divided by the zoom factor. This allow to have essentially a fixed Stroke
     * independent by the zoom. The returned Stroke is a copy. Remember to restore the right stroke in the graphics when
     * done.
     * 
     * It works only with instances of BasicStroke
     * 
     * zoom is the zoom factor.
     * 
     * @param stroke
     *          the stroke
     * @param zoom
     *          the zoom
     * @return the inverted zoomed stroke
     */
    public static Stroke getInvertedZoomedStroke(Stroke stroke, double zoom) {
        if (stroke == null || !(stroke instanceof BasicStroke))
            return stroke;

        BasicStroke bs = (BasicStroke) stroke;
        float[] dashArray = bs.getDashArray();

        float[] newDashArray = null;
        if (dashArray != null) {
            newDashArray = new float[dashArray.length];
            for (int i = 0; i < newDashArray.length; ++i) {
                newDashArray[i] = (float) (dashArray[i] / zoom);
            }
        }

        BasicStroke newStroke = new BasicStroke(
                (float) (bs.getLineWidth() / zoom), bs.getEndCap(),
                bs.getLineJoin(), bs.getMiterLimit(),
                //(float)(bs.getMiterLimit() / zoom),
                newDashArray, (float) (bs.getDashPhase() / zoom));
        return newStroke;
    }
}

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