Extract scaling from AffineTransform Let assume that the AffineTransform is a composite of scales, translates, and rotates. - Java java.lang

Java examples for java.lang:Math Geometry

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Description

Extract scaling from AffineTransform Let assume that the AffineTransform is a composite of scales, translates, and rotates.

Demo Code


//package com.java2s;

import java.awt.geom.AffineTransform;

public class Main {
    /**//  w w w .  ja v a2s  .c  o m
     * Extract scaling from AffineTransform<br>
     * Let assume that the AffineTransform is a composite of scales, translates, and rotates. <br>
     * No independent shear has to be applied and scaling must be uniform along the two axes.
     * 
     * @param transform
     *            current AffineTransform
     */
    public static double extractScalingFactor(AffineTransform transform) {
        double scalingFactor = 1.0;

        if (transform != null) {
            double sx = transform.getScaleX();
            double shx = transform.getShearX();
            if (sx != 0 || shx != 0) {
                scalingFactor = Math.sqrt(sx * sx + shx * shx);
            }
        }

        return scalingFactor;
    }
}

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