boofcv.gui.image.DiscretePyramidPanel Maven / Gradle / Ivy

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BoofCV is an open source Java library for real-time computer vision and robotics applications.

There is a newer version: 1.1.7

/*
 * Copyright (c) 2021, Peter Abeles. All Rights Reserved.
 *
 * This file is part of BoofCV (http://boofcv.org).
 *
 * 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.
 */

package boofcv.gui.image;

import boofcv.struct.image.ImageGray;
import boofcv.struct.pyramid.ImagePyramid;
import boofcv.struct.pyramid.PyramidDiscrete;

import javax.swing.*;
import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;

/**
 * Displays the entire image pyramid in a single panel. With discrete pyramids it is possible
 * to show the whole pyramid inside a single window of a reasonable size.
 *
 * @author Peter Abeles
 */
@SuppressWarnings({"NullAway.Init"})
public class DiscretePyramidPanel> extends JPanel {

	BufferedImage img;
	ImagePyramid pyramid;

	BufferedImage[] layers;

	public DiscretePyramidPanel() {}

	public DiscretePyramidPanel( PyramidDiscrete pyramid ) {
		setPyramid(pyramid);
	}

	public void setPyramid( PyramidDiscrete pyramid ) {
		this.pyramid = pyramid;

		// create temporary buffers for each layer in the pyramid
		layers = new BufferedImage[pyramid.getNumLayers()];
		for (int i = 0; i < layers.length; i++) {
			int width = pyramid.getWidth(i);
			int height = pyramid.getHeight(i);
			layers[i] = new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR);
		}

		// compute the size of the panel
		int width = pyramid.getWidth(0);
		int height = pyramid.getHeight(0);

		if (pyramid.getNumLayers() > 1) {
			width += pyramid.getWidth(1);
		}

		img = new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR);

		setPreferredSize(new Dimension(width, height));
	}

	public void render() {
		for (int i = 0; i < layers.length; i++) {
			VisualizeImageData.standard(pyramid.getLayer(i), layers[i]);
		}

		Graphics2D g2 = (Graphics2D)img.getGraphics();

		g2.drawImage(layers[0], 0, 0, this);
		int height = 0;
		int width = layers[0].getWidth();
		for (int i = 1; i < layers.length; i++) {
			g2.drawImage(layers[i], width, height, this);
			height += layers[i].getHeight();
		}
	}

	@Override
	public void paintComponent( Graphics g ) {
		if (img != null) {
			Graphics2D g2 = (Graphics2D)g;
			g2.setColor(Color.WHITE);
			g2.fillRect(0, 0, getWidth(), getHeight());

			double scale = img.getWidth()/(double)getWidth();
			if (scale > 1) {
				AffineTransform tran = new AffineTransform();
				tran.setToScale(1.0/scale, 1.0/scale);
				g2.drawImage(img, tran, null);
			} else {
				g.drawImage(img, 0, 0, this);
			}
		}
	}
}