TextGraphicsConverterImpl.java - master - Ersh/Diplom_netology

TextGraphicsConverterImpl.java
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Ersh
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18 ноя 2025, 18:13
18 ноя 2025, 18:132a2f69b
package ru.netology.graphics.image;

import ru.netology.graphics.image.BadImageSizeException;
import ru.netology.graphics.image.TextColorSchema;
import ru.netology.graphics.image.TextGraphicsConverter;

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 double maxRatio = 0;
    private int maxWidth = 0;
    private int maxHeight = 0;
    private TextColorSchema schema = new TextColorSchemaImpl();

    @Override
    public String convert(String url) throws IOException, BadImageSizeException {

        BufferedImage img = ImageIO.read(new URL(url));


        if (maxRatio > 0) {
            double ratio = (double) img.getWidth() / img.getHeight();
            if (ratio > maxRatio) {

                throw new BadImageSizeException((double) img.getWidth(), (double) img.getHeight());
            }
        }

        int originalWidth = img.getWidth();
        int originalHeight = img.getHeight();
        int newWidth = originalWidth;
        int newHeight = originalHeight;

        if (maxWidth > 0 || maxHeight > 0) {
            double widthScale = 1.0;
            double heightScale = 1.0;

            if (maxWidth > 0 && originalWidth > maxWidth) {
                widthScale = (double) maxWidth / originalWidth;
            }

            if (maxHeight > 0 && originalHeight > maxHeight) {
                heightScale = (double) maxHeight / originalHeight;
            }

            double scale = Math.min(widthScale, heightScale);

            if (scale < 1.0) {
                newWidth = (int) (originalWidth * scale);
                newHeight = (int) (originalHeight * scale);
            }
        }


        Image scaledImage = img.getScaledInstance(newWidth, newHeight, BufferedImage.SCALE_SMOOTH);


        BufferedImage bwImg = new BufferedImage(newWidth, newHeight, BufferedImage.TYPE_BYTE_GRAY);
        Graphics2D graphics = bwImg.createGraphics();
        graphics.drawImage(scaledImage, 0, 0, null);
        graphics.dispose();


        WritableRaster bwRaster = bwImg.getRaster();
        int[] pixelArray = new int[3];

        StringBuilder result = new StringBuilder();

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

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


        return result.toString();
    }

    @Override
    public void setMaxRatio(double maxRatio) {
        this.maxRatio = maxRatio;
    }

    @Override
    public void setMaxWidth(int maxWidth) {
        this.maxWidth = maxWidth;
    }

    @Override
    public void setMaxHeight(int maxHeight) {
        this.maxHeight = maxHeight;
    }

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