This modifies the supplied affine transform so that the rectangle given by real Bounds will fit inside of the rectangle given by window Bounds. - Java 2D Graphics

Java examples for 2D Graphics:Transform

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Description

This modifies the supplied affine transform so that the rectangle given by real Bounds will fit inside of the rectangle given by window Bounds.

Demo Code


//package com.java2s;

import java.awt.geom.AffineTransform;
import java.awt.geom.RectangularShape;

public class Main {
    /**//from   ww  w .  j  a  v a2 s  .  co  m
     * This modifies the supplied affine transform so that the
     * rectangle given by realBounds will fit inside of the rectangle
     * given by windowBounds.  The center of the realBounds rectangle
     * will coincide with that of the windowBounds rectangle.
     *
     * NOTE: THIS ONLY CORRECTLY HANDLES THE CASE WHEN THE USER SPACE
     * RECTANGLE IS CENTERED ON THE ORIGIN.
     *
     * @param transform the transform which will be modified
     * @param realBounds the user space rectangle
     * @param windowBounds the window to map the user rectangle to */
    public static void getFittingTransform(AffineTransform transform,
            RectangularShape realBounds, RectangularShape windowBounds) {

        if (realBounds == null || windowBounds == null) {
            transform.setToIdentity();
        } else {

            // Get the dimensions of the windows.
            double realWidth = realBounds.getWidth();
            double realHeight = realBounds.getHeight();
            double windowWidth = windowBounds.getWidth();
            double windowHeight = windowBounds.getHeight();

            if (realWidth > 0 && realHeight > 0) {

                // Get the necessary scaling factor.
                double scaleWidth = windowWidth / realWidth;
                double scaleHeight = windowHeight / realHeight;
                double scale = Math.min(scaleWidth, scaleHeight);

                transform.setTransform(scale, 0., 0., -scale,
                        windowWidth / 2., windowHeight / 2.);
            } else {
                transform.setToIdentity();
            }
        }
    }
}

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