Swing method similar to HTML5 canvas.putImageData (arrayOfPixels, 0,0)

Question

I have Javascript code that acts on a pixel array defined like this:

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

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

Is there any convenience way to draw this array on the screen as it is? If not, what is the easiest way to draw this array using Swing?

Answer 1

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

 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); } }); } }