Compute the bounds of a shape when stroked with the given stroke. - Java 2D Graphics

Java examples for 2D Graphics:Shape

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Description

Compute the bounds of a shape when stroked with the given stroke.

Demo Code

/*//from w  w w.j  a  v a 2 s . c  o m
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//package com.java2s;
import java.awt.BasicStroke;
import java.awt.Shape;
import java.awt.Stroke;

import java.awt.geom.Rectangle2D;

public class Main {
    /** Compute the bounds of a shape when stroked with the given stroke.
     */
    public static Rectangle2D computeStrokedBounds(Shape shape,
            Stroke stroke) {
        if (stroke instanceof BasicStroke) {
            // For some reason (antialiasing?) the bounds returned by
            // BasicStroke is off by one.  This code works around it.
            // if all we want is the bounds, then we don't need to actually
            // stroke the shape.  We've had reports that this is no longer
            // necessary with JDK1.3.
            Rectangle2D rect = shape.getBounds2D();
            int width = (int) ((BasicStroke) stroke).getLineWidth() + 2;
            return new Rectangle2D.Double(rect.getX() - width, rect.getY()
                    - width, rect.getWidth() + width + width,
                    rect.getHeight() + width + width);
        } else {
            // For some reason (antialiasing?) the bounds returned by
            // BasicStroke is off by one.  This code works around it.
            // We've had reports that this is no longer
            // necessary with JDK1.3.
            Rectangle2D rect = stroke.createStrokedShape(shape)
                    .getBounds2D();
            return new Rectangle2D.Double(rect.getX() - 1, rect.getY() - 1,
                    rect.getWidth() + 2, rect.getHeight() + 2);
        }
    }
}

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