TextGraphicsConverterImpl.java - master - aizner/diplomjava

TextGraphicsConverterImpl.java
97 строк3 KB
aizner
create: TextGraphicsConverterImpl.java
10 фев 2026, 17:15
10 фев 2026, 17:15357a5e4
package ru.netology.graphics.image;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.awt.image.WritableRaster;
import java.io.IOException;
import java.net.URL;


public class TextGraphicsConverterImpl implements TextGraphicsConverter {

    
    private Integer maxWidth;  
    private Integer maxHeight;  
    private Double maxRatio;   

    private TextColorSchema schema = new DefaultTextColorSchema();

    @Override
    public String convert(String url) throws IOException, BadImageSizeException {
        BufferedImage img = ImageIO.read(new URL(url));
        if (img == null) {
            throw new IOException("Не удалось прочитать изображение по URL: " + url);
        }

        int width = img.getWidth();
        int height = img.getHeight();

        if (maxRatio != null && maxRatio > 0) {
            double ratio = (double) Math.max(width, height) / (double) Math.min(width, height);
            if (ratio > maxRatio) {
                throw new BadImageSizeException(ratio, maxRatio);
            }
        }

        int newWidth = width;
        int newHeight = height;

        double scale = 1.0;
        if (maxWidth != null && maxWidth > 0 && newWidth > maxWidth) {
            scale = Math.min(scale, (double) maxWidth / (double) newWidth);
        }
        if (maxHeight != null && maxHeight > 0 && newHeight > maxHeight) {
            scale = Math.min(scale, (double) maxHeight / (double) newHeight);
        }

        if (scale < 1.0) {
            newWidth = Math.max(1, (int) Math.floor(newWidth * scale));
            newHeight = Math.max(1, (int) Math.floor(newHeight * scale));
        }

        BufferedImage bwImg = new BufferedImage(newWidth, newHeight, BufferedImage.TYPE_BYTE_GRAY);
        Graphics2D graphics = bwImg.createGraphics();
        graphics.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
        graphics.drawImage(img, 0, 0, newWidth, newHeight, null);
        graphics.dispose();

        WritableRaster bwRaster = bwImg.getRaster();
        StringBuilder sb = new StringBuilder(newHeight * (newWidth * 2 + 1));
        int[] pixel = new int[3];

        for (int h = 0; h < newHeight; h++) {
            for (int w = 0; w < newWidth; w++) {
                int color = bwRaster.getPixel(w, h, pixel)[0];
                char c = schema.convert(color);

                sb.append(c).append(c);
            }
            sb.append('\n');
        }

        return sb.toString();
    }

    @Override
    public void setMaxWidth(int width) {
        this.maxWidth = width > 0 ? width : null;
    }

    @Override
    public void setMaxHeight(int height) {
        this.maxHeight = height > 0 ? height : null;
    }

    @Override
    public void setMaxRatio(double maxRatio) {
        this.maxRatio = maxRatio > 0 ? maxRatio : null;
    }

    @Override
    public void setTextColorSchema(TextColorSchema schema) {
        if (schema != null) {
            this.schema = schema;
        }
    }
}