Swing 方法类似于 HTML5 的 canvas.putImageData(arrayOfPixels, 0,0) [英] Swing method akin to HTML5's canvas.putImageData(arrayOfPixels, 0,0)

问题描述

我有一些 Javascript 代码可以作用于像这样定义的像素数组:

I have some Javascript code that acts on an pixel array defined like so:

screen = {'width':160, 'height':144, 'data':new Array(160*144*4)};
...
canvas.putImageData(GPU._scrn, 0,0);

其中屏幕是宽度 * 高度 * 4 个值的一维数组，代表颜色，详见此处:https://developer.mozilla.org/En/HTML/Canvas/Pixel_manipulation_with_canvas

Where screen is 1D array of width * height * 4 values representing the colors as detailed here: https://developer.mozilla.org/En/HTML/Canvas/Pixel_manipulation_with_canvas

是否有一种方便的方法可以将这个数组按原样绘制到屏幕上?如果没有，使用 Swing 绘制此数组的最简单方法是什么?

Is there a convenience method to paint this array to the screen as is? If not, what's the easiest way to paint this array using Swing?

推荐答案

BufferedImage 可能是最灵活的选择.您可以将其用作 Icon 或覆盖 paintComponent() 以获得 Java2D.

BufferedImage is probably the most flexible choice. You can use it as an Icon or override paintComponent() for the full generality of Java2D.

package overflow;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.GridLayout;
import java.awt.image.BufferedImage;
import java.util.ArrayList;
import java.util.List;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

/** @see http://stackoverflow.com/questions/7298492 */
public class PiRaster extends JPanel {

    private static final int W = 30;
    private static final int H = 30;
    private static List<Integer> pi = new ArrayList<Integer>();
    private final List<Integer> clut = new ArrayList<Integer>();
    private BufferedImage image;

    public PiRaster() {
        this.setPreferredSize(new Dimension(W * 16, H * 10));
        String s = ""
            + "31415926535897932384626433832795028841971693993751"
            + "05820974944592307816406286208998628034825342117067"
            + "98214808651328230664709384460955058223172535940812"
            + "84811174502841027019385211055596446229489549303819"
            + "64428810975665933446128475648233786783165271201909"
            + "14564856692346034861045432664821339360726024914127";
        for (int i = 0; i < s.length(); i++) {
            pi.add(s.charAt(i) - '0');
        }
        for (int i = 0; i < 10; i++) {
            clut.add(Color.getHSBColor(0.6f, i / 10f, 1).getRGB());
        }
        image = new BufferedImage(W, H, BufferedImage.TYPE_INT_ARGB);
        int i = 0;
        for (int row = 0; row < H; row++) {
            for (int col = 0; col < W; col++) {
                image.setRGB(col, row, clut.get(pi.get(i)));
                if (++i == pi.size()) {
                    i = 0;
                }
            }
        }
    }

    private static class ClutPanel extends JPanel {

        private int i;

        public ClutPanel(List<Integer> rgbList) {
            this.setLayout(new GridLayout(1, 0));
            for (Integer rgb : rgbList) {
                JLabel label = new JLabel(String.valueOf(i++), JLabel.CENTER);
                label.setOpaque(true);
                label.setBackground(new Color(rgb));
                this.add(label);
            }
        }
    }

    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.drawImage(image, 0, 0, getWidth(), getHeight(), null);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                JFrame frame = new JFrame();
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                PiRaster pr = new PiRaster();
                Icon icon = new ImageIcon(pr.image);
                frame.add(new JLabel(icon), BorderLayout.WEST);
                frame.add(pr, BorderLayout.CENTER);
                frame.add(new ClutPanel(pr.clut), BorderLayout.SOUTH);
                frame.pack();
                frame.setVisible(true);
            }
        });
    }
}

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