ascii.Image2ascii Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of act Show documentation
Show all versions of act Show documentation
The ACT full stack MVC framework
package ascii;
/*-
* #%L
* ACT Framework
* %%
* Copyright (C) 2014 - 2017 ActFramework
* %%
* 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.
* #L%
*/
import net.sf.image4j.codec.ico.ICODecoder;
import org.osgl.$;
import org.osgl.util.E;
import org.osgl.util.IO;
import org.osgl.util.Keyword;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;
// Adapted from https://github.com/netwinder-dev/ASCIIConversion/blob/master/src/ASCIIConvert/ASCIIConversions.java
public class Image2ascii {
private static final int MAX_WIDTH = 80;
private int[] statsArray = new int[12];
char[] convRefArray = {' ', '~', '-', ':', '+', '%', '=', 'W', '@', '$', '#', '▆'};
char[] imgArray;
private long dStart;
private long dEnd;
/**
* The main conversion method.
* @param image A BufferedImage containing the image that needs to be converted
* @param favicon When ico is true it will convert ico file into 16 x 16 size
* @return A string containing the ASCII version of the original image.
*/
public String convert(BufferedImage image, boolean favicon) {
// Reset statistics before anything
statsArray = new int[12];
// Begin the timer
dStart = System.nanoTime();
// Scale the image
image = scale(image, favicon);
// The +1 is for the newline characters
StringBuilder sb = new StringBuilder((image.getWidth() + 1) * image.getHeight());
for (int y = 0; y < image.getHeight(); y++) {
// At the end of each line, add a newline character
if (sb.length() != 0) sb.append("\n");
for (int x = 0; x < image.getWidth(); x++) {
//
Color pixelColor = new Color(image.getRGB(x, y), true);
int alpha = pixelColor.getAlpha();
boolean isTransient = alpha < 0.1;
double gValue = isTransient ? 250 : ((double) pixelColor.getRed() * 0.2989 + (double) pixelColor.getBlue() * 0.5870 + (double) pixelColor.getGreen() * 0.1140) / ((double)alpha / (double)250);
final char s = gValue < 130 ? darkGrayScaleMap(gValue) : lightGrayScaleMap(gValue);
sb.append(s);
}
}
imgArray = sb.toString().toCharArray();
dEnd = System.nanoTime();
return sb.toString();
}
/**
* Image scale method
* @param imageToScale The image to be scaled
* @param dWidth Desired width, the new image object is created to this size
* @param dHeight Desired height, the new image object is created to this size
* @param fWidth What to multiply the width by. value < 1 scales down, and value > one scales up
* @param fHeight What to multiply the height by. value < 1 scales down, and value > one scales up
* @return A scaled image
*/
private static BufferedImage scale(BufferedImage imageToScale, int dWidth, int dHeight, double fWidth, double fHeight) {
BufferedImage dbi = null;
// Needed to create a new BufferedImage object
int imageType = imageToScale.getType();
if (imageToScale != null) {
dbi = new BufferedImage(dWidth, dHeight, imageType);
Graphics2D g = dbi.createGraphics();
AffineTransform at = AffineTransform.getScaleInstance(fWidth, fHeight);
g.drawRenderedImage(imageToScale, at);
}
return dbi;
}
private char darkGrayScaleMap(double g) {
char str;
if (g >= 120.0) {
str = '=';
} else if (g >= 100.0) {
str = 'W';
} else if (g >= 80.0) {
str = '@';
} else if (g >= 70.0) {
str = '$';
} else if (g >= 30.0) {
str = '#';
} else if (g >= 12) {
str = '▓';
} else {
str = '¶';
}
return str;
}
private char lightGrayScaleMap(double g) {
char str;
// Light
if (g >= 240.0) {
str = ' ';
} else if (g >= 220) {
str = '~';
} else if (g >= 200.0) {
str = '-';
} else if (g >= 180.0) {
str = ':';
} else if (g >= 160.0) {
str = '+';
} else {
str = '%';
}
return str;
}
private static BufferedImage scale(BufferedImage original, boolean favicon) {
$.T3 params = calcScaleParams(original, favicon);
return scale(original, params._1, params._2 / 2, params._3, params._3 / 2);
}
private static $.T3 calcScaleParams(BufferedImage original, boolean favicon) {
int width = original.getWidth(), height = original.getHeight();
int max = favicon ? 16 : MAX_WIDTH;
if (width <= max) {
return $.T3(width, height, 1.0d);
}
double factor = ((double) max / (double) width);
return $.T3(max, (int)(height * factor), factor);
}
public static String render(File imageSource, boolean favicon) {
try {
URL url = imageSource.toURI().toURL();
boolean isIcon = imageSource.getName().endsWith(".ico");
return render(url, favicon, isIcon);
} catch (MalformedURLException e) {
// this is never gonna happen
throw E.unexpected(e);
}
}
public static String render(URL imageSource, boolean iconFile) {
return render(imageSource, false, iconFile);
}
public static String render(URL imageSource, boolean favicon, boolean iconFile) {
try {
BufferedImage image = read(imageSource, iconFile);
return new Image2ascii().convert(image, favicon);
} catch (Exception e) {
return "";
}
}
private static BufferedImage read(URL imageSource, boolean isIcon) throws Exception {
if (isIcon) {
java.util.List images = ICODecoder.read(imageSource.openStream());
return images.get(0);
} else {
return ImageIO.read(imageSource);
}
}
}