Java Draw Image drawCenterCrop(Graphics2D g, BufferedImage source, Rectangle dstRect)

Description

Draws the given BufferedImage to the canvas, centered and cropped to fill the bounds defined by the destination rectangle, and with preserved aspect ratio.

License

Apache License

Parameter

Parameter	Description
g	The destination canvas.
source	The source image.
dstRect	The destination rectangle in the destination canvas into which to draw the image.

Declaration

public static void drawCenterCrop(Graphics2D g, BufferedImage source,
        Rectangle dstRect) 

Method Source Code

//package com.java2s;
/*/*from w  w w  . j av  a  2 s.  co m*/
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;

import java.awt.Rectangle;
import java.awt.image.BufferedImage;

public class Main {
    /**
     * Draws the given {@link BufferedImage} to the canvas, centered and cropped to fill the
     * bounds defined by the destination rectangle, and with preserved aspect ratio.
     *
     * @param g       The destination canvas.
     * @param source  The source image.
     * @param dstRect The destination rectangle in the destination canvas into which to draw the
     *                image.
     */
    public static void drawCenterCrop(Graphics2D g, BufferedImage source,
            Rectangle dstRect) {
        final int srcWidth = source.getWidth();
        final int srcHeight = source.getHeight();
        if (srcWidth * 1.0 / srcHeight > dstRect.width * 1.0
                / dstRect.height) {
            final int scaledWidth = dstRect.height * srcWidth / srcHeight;
            final int scaledHeight = dstRect.height;
            Image scaledImage = scaledImage(source, scaledWidth,
                    scaledHeight);
            g.drawImage(scaledImage, dstRect.x, dstRect.y, dstRect.x
                    + dstRect.width, dstRect.y + dstRect.height,
                    0 + (scaledWidth - dstRect.width) / 2, 0, 0
                            + (scaledWidth - dstRect.width) / 2
                            + dstRect.width, 0 + dstRect.height, null);
        } else {
            final int scaledWidth = dstRect.width;
            final int scaledHeight = dstRect.width * srcHeight / srcWidth;
            Image scaledImage = scaledImage(source, scaledWidth,
                    scaledHeight);
            g.drawImage(scaledImage, dstRect.x, dstRect.y, dstRect.x
                    + dstRect.width, dstRect.y + dstRect.height, 0,
                    0 + (scaledHeight - dstRect.height) / 2,
                    0 + dstRect.width, 0 + (scaledHeight - dstRect.height)
                            / 2 + dstRect.height, null);
        }
    }

    /**
     * Smoothly scales the given {@link BufferedImage} to the given width and height using the
     * {@link Image#SCALE_SMOOTH} algorithm (generally bicubic resampling or bilinear filtering).
     *
     * @param source The source image.
     * @param width  The destination width to scale to.
     * @param height The destination height to scale to.
     * @return A new, scaled image.
     */
    public static BufferedImage scaledImage(BufferedImage source,
            int width, int height) {
        Image scaledImage = source.getScaledInstance(width, height,
                Image.SCALE_SMOOTH);
        BufferedImage scaledBufImage = new BufferedImage(width, height,
                BufferedImage.TYPE_INT_ARGB);
        Graphics g = scaledBufImage.createGraphics();
        g.drawImage(scaledImage, 0, 0, null);
        g.dispose();
        return scaledBufImage;
    }
}

Related

1. drawBorder(BufferedImage originalImage, Color borderColor, int borderWidth)
2. drawBorders(final BufferedImage image, final int currentX, final int currentY, final int width, final int height, final int subImageWidth, final int subImageHeight, final Color c)
3. drawBoundingPolygon(BufferedImage canvas, Polygon p, Color fgColour)
4. drawBubble(BufferedImage img, Graphics g, Component component)
5. drawBytes(BufferedImage image, byte[] buf)
6. drawCenteredImage(Rectangle2D bounds, Graphics2D g2, Image image, ImageObserver observer, int imageWidth, int imageHeight, boolean shrink)
7. DrawCross(BufferedImage bi, Point pt)
8. drawImage(BufferedImage bi, RenderedImage im)
9. drawImage(BufferedImage originalImage, BufferedImage scaledImage, int width, int height)