resize BufferedImage Maintaining Ratio - Java 2D Graphics

Java examples for 2D Graphics:BufferedImage Resize

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Description

resize BufferedImage Maintaining Ratio

Demo Code


//package com.java2s;
import java.awt.Dimension;
import java.awt.Graphics2D;

import java.awt.image.BufferedImage;

public class Main {
    public static BufferedImage resizeMaintainingRatio(BufferedImage img,
            Dimension newSize) {//from  www .  j  a  va2  s.  c om
        double w = img.getWidth();
        double h = img.getHeight();

        if (newSize.getWidth() != 0 && newSize.getHeight() != 0) {
            double ratioH = h / w;
            double ratioW = w / h;

            double newH, newW;

            newH = newSize.getHeight();
            newW = newH * ratioW;

            if (newW > newSize.getWidth()) {
                newW = newSize.getWidth();
                newH = newW * ratioH;
            }

            return resize(img, new Dimension((int) newW, (int) newH));
        } else {
            return img;
        }
    }

    public static BufferedImage resize(BufferedImage img, Dimension newSize) {
        int type = img.getType();

        if (type == 0)
            type = BufferedImage.TYPE_INT_ARGB;

        BufferedImage resizedImage = new BufferedImage(
                (int) newSize.getWidth(), (int) newSize.getWidth(), type);
        Graphics2D g = resizedImage.createGraphics();
        g.drawImage(img, 0, 0, (int) newSize.getWidth(),
                (int) newSize.getWidth(), null);
        g.dispose();

        return resizedImage;
    }
}

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