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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) 2020, 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;

import boofcv.alg.misc.ImageStatistics;
import boofcv.factory.filter.kernel.FactoryKernelGaussian;
import boofcv.gui.image.ShowImages;
import boofcv.struct.convolve.Kernel1D_F32;
import boofcv.struct.image.GrayF32;

import javax.swing.*;
import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.util.TimerTask;

/**
 * Dynamically rendered BoofCV Logo
 *
 * @author Peter Abeles
 */
public class BoofLogo extends JPanel {

	public static final String NAME = "BOOFCV";
	public static final int MAX_RADIUS = 40;

	public int radius = MAX_RADIUS;
	public boolean reverse = false;

	public BoofLogo() {
		setBackground(Color.WHITE);

		setPreferredSize(new Dimension(620, 300));
	}

	@Override
	protected void paintComponent( Graphics g ) {
		super.paintComponent(g);
		Graphics2D g2 = (Graphics2D)g;
		g2.setRenderingHint(
				RenderingHints.KEY_TEXT_ANTIALIASING,
				RenderingHints.VALUE_TEXT_ANTIALIAS_ON);

		int order = 1;
		double sigma = FactoryKernelGaussian.sigmaForRadius(radius, order);

		Kernel1D_F32 kerX = FactoryKernelGaussian.derivativeK(Kernel1D_F32.class, order, sigma, 2*radius);
		Kernel1D_F32 kerY = FactoryKernelGaussian.derivativeK(Kernel1D_F32.class, order, sigma, radius);
		GrayF32 kernel = new GrayF32(kerX.width, kerY.width);

		for (int i = 0, index = 0; i < kernel.height; i++) {
			for (int j = 0; j < kernel.width; j++) {
				kernel.data[index++] = kerY.data[i]*kerX.data[j];
			}
		}

		float max = ImageStatistics.maxAbs(kernel);

		BufferedImage image = new BufferedImage(kernel.width, kernel.height, BufferedImage.TYPE_INT_RGB);

		for (int y = 0; y < kernel.height; y++) {
			for (int x = 0; x < kernel.width; x++) {

				float v = kernel.get(x, y);

				int rgb;
				if (v > 0) {
					int inv255 = (int)(200*(1 - v/max)) + 55;
					rgb = 255 << 16 | inv255 << 8 | inv255;
				} else {
					int inv255 = (int)(200*(1 + v/max)) + 55;
					rgb = inv255 << 16 | inv255 << 8 | inv255;
				}
				image.setRGB(x, y, rgb);
			}
		}

		double w = Math.min(getWidth(), getHeight());
		double s = w/(double)kernel.height;
		// if tx not aligned to integer there is a rendering bug in linux
		double tx = (int)((getWidth() - s*kernel.width)/2);
		AffineTransform adjustment = new AffineTransform(s, 0, 0, s, tx, 0);
		g2.drawImage(image, adjustment, null);

		Font font = new Font("Serif", Font.BOLD, (int)(w*0.4));
		FontMetrics metrics = g2.getFontMetrics(font);
		Rectangle2D r = metrics.getStringBounds(NAME, null);
		tx = getWidth()/2 - r.getCenterX();
		double ty = (int)w/2 - r.getCenterY();

		g2.setFont(font);
		g2.setColor(Color.BLACK);
		g2.drawString(NAME, (float)tx, (float)ty);
	}

	public void animate( long period ) {
		radius = 1;
		java.util.Timer timer = new java.util.Timer();
		timer.schedule(new TimerTask() {
			@Override
			public void run() {
				radius += reverse ? -1 : 1;
				if (radius <= 0) {
					radius = 1;
					reverse = false;
				} else if (radius >= MAX_RADIUS) {
					reverse = true;
				}
				repaint();
			}
		}, 0, period/MAX_RADIUS);
	}

	public void setRadius( int radius ) {
		this.radius = radius;
	}

	public static void main( String[] args ) {
		BoofLogo logo = new BoofLogo();
		logo.animate(4000);
		ShowImages.showWindow(logo, "Logo", true);
	}
}