java

Question

我正在尝试在 Graphics2D 上绘制一个简单的图像。但是，当我旋转图像时，它显示了一些边缘，并忽略了渲染提示。

有什么解决办法？对于 45 度等它工作正常。但对其他人来说，它搞砸了！

谢谢

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.File;
import java.net.URL;
import javax.imageio.ImageIO;

public class Canvas {

    public static void main(String args[]) {
        try {
            BufferedImage file = ImageIO.read(new URL("https://live.staticflickr.com/8710/28233783223_2387e00f93_b.jpg"));
            BufferedImage bi = new BufferedImage(1000, 500, BufferedImage.TYPE_4BYTE_ABGR);
            Graphics2D g2 = (Graphics2D) bi.getGraphics();
            g2.addRenderingHints(new RenderingHints(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR));
            g2.addRenderingHints(new RenderingHints(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON));
            g2.setColor(Color.WHITE);
            g2.fillRect(0, 0, 1000, 500);
            AffineTransform ax = new AffineTransform();
            ax.translate(200, 200);
            ax.rotate(Math.PI * (-318) / 180, 500, 250);
            g2.drawImage(file, ax, null);
            g2.dispose();
            ImageIO.write(bi, "png", new File("text.png"));
        } catch (Exception ex) {
            // error
        }
    }
}

Answer 1

图像绘制似乎不受抗锯齿的影响。然而，绘制矩形是。通过使用 TexturePaint 和 file 作为基础图像，我们可以简单地绘制一个与图像大小相同的矩形。生成的图像不会有任何锯齿状边缘。

import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.File;
import java.net.URL;
import javax.imageio.ImageIO;

class Canvas {

    public static void main(String args[]) {
        try {
            BufferedImage file = ImageIO.read(new URL("https://live.staticflickr.com/8710/28233783223_2387e00f93_b.jpg"));
            BufferedImage bi = new BufferedImage(1000, 500, BufferedImage.TYPE_4BYTE_ABGR);
            Graphics2D g2 = (Graphics2D) bi.getGraphics();
            g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
            g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
            g2.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
            g2.setColor(Color.WHITE);
            g2.fillRect(0, 0, 1000, 500);
            AffineTransform ax = new AffineTransform();
            ax.translate(200, 200);
            ax.rotate(Math.PI * (-318) / 180, 500, 250);
            // g2.drawImage(file, ax, null);
            g2.setPaint(new TexturePaint(file, new Rectangle(0,0, file.getWidth(), file.getHeight())));
            g2.transform(ax);
            g2.fillRect(0,0 , 1000, 500);
            
g2.dispose();
            ImageIO.write(bi, "png", new File("text.png"));
        } catch (Exception ex) {
            // error
        }
    }
}

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