不能以协同方式绘制像素，Pi数
我想打印pi数字的每个数字作为彩色像素，所以，我得到一个带有pi数字的输入，然后将其解析成一个列表，每个节点包含一个数字（我知道，我稍后会使用数组） ，但我从来没有把它画成屏幕……有人能帮我看看我错了吗？
import java.awt.BorderLayout; import java.awt.Graphics; import java.awt.Image; import java.awt.image.MemoryImageSource; import java.io.BufferedReader; import java.io.File; import java.io.FileReader; import java.util.ArrayList; import java.util.List; import javax.swing.JFrame; import javax.swing.JPanel; public class PiPainter extends JPanel { private static final long serialVersionUID = 6416932054834995251L; private static int pixels[]; private static List pi = new ArrayList(); private final static int[] color = { 0xFF000000, 0xFF787878, 0xFF008B00, 0xFF00008B, 0xFF008B8B, 0xFF008B00, 0xFFCDCD00, 0xFFFF4500, 0xFF8B0000, 0xFFFF0000 }; public static void readFile(String name) { File file = new File(name); BufferedReader reader = null; char[] digits; try { reader = new BufferedReader(new FileReader(file)); String text = null; while((text = reader.readLine()) != null) { digits = text.toCharArray(); for(char el : digits) if(el != ' ') pi.add(Character.getNumericValue(el)); } } catch (Exception e) { e.printStackTrace(); } } public void paint(Graphics gg) { // page containing pi number, http://gc3.net84.net/pi.htm // other source, http://newton.ex.ac.uk/research/qsystems/collabs/pi/pi6.txt readFile("c:\\pi.txt"); int h = 300; int w = 300; int digit; int i = 0; pixels = new int[w * h]; for (int y = 0; y < h; y++) { for (int x = 0; x < w; x++) { pixels[i] = color[pi.get(i)]; i++; } } Image art = createImage(new MemoryImageSource(w, h, pixels, 0, w)); gg.drawImage(art, 0, 0, this); } public static void main(String[] args) { JFrame frame = new JFrame(); frame.getContentPane().add(new PiPainter(), BorderLayout.CENTER); frame.setLocationRelativeTo(null); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(400,400); frame.setVisible(true); } } 我不熟悉MemoryImageSource 。 这是π的前16个 300位数字，在BufferedImage重复并使用您的颜色表。
Pi.png http://sofzh.miximages.com/java/24ctm9v.png
import java.awt.Dimension; import java.awt.Graphics; import java.awt.image.BufferedImage; import java.util.ArrayList; import java.util.List; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.SwingUtilities; public class PiRaster extends JPanel { private static final int W = 30; private static final int H = 30; private static List pi = new ArrayList (); BufferedImage image; private int[] clut = { 0x000000, 0x787878, 0x008B00, 0x00008B, 0x008B8B, 0x008B00, 0xCDCD00, 0xFF4500, 0x8B0000, 0xFF0000 }; 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'); } } @Override public void paintComponent(Graphics g) { if (image == null) { image = (BufferedImage) createImage(W, H); int i = 0; for (int row = 0; row < H; row++) { for (int col = 0; col < W; col++) { image.setRGB(col, row, clut[pi.get(i)]); if (++i == pi.size()) { i = 0; } } } } 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); frame.add(new PiRaster()); frame.pack(); frame.setVisible(true); } }); } }
@trashgod
谢谢你的回答，我改变了一点点来实现我的目标; ）
现在，您可以轻松更改宽度以获得更好的图像视图并适合内容，并且数字不会重复，从而可以轻松感知模式（如果可能的话）。 哦，我最后添加了大约2~3行，以澄清它。
替代文字http://sofzh.miximages.com/java/4fu91c.png
package edu.pi; import java.awt.Dimension; import java.awt.Graphics; import java.awt.image.BufferedImage; import java.util.ArrayList; import java.util.List; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.SwingUtilities; public class PiRaster extends JPanel { private static final long serialVersionUID = -1298205187260747210L; private static int W; private static int H; private static List pi = new ArrayList (); BufferedImage image; private int[] clut = { 0x000000, 0x787878, 0x008B00, 0x00008B, 0x008B8B, 0x008B00, 0xCDCD00, 0xFF4500, 0x8B0000, 0xFF0000 }; public PiRaster() { String s = "3." + "14159265358979323846264338327950288419716939937510" + "58209749445923078164062862089986280348253421170679" + "82148086513282306647093844609550582231725359408128" + "48111745028410270193852110555964462294895493038196" + "44288109756659334461284756482337867831652712019091" + "45648566923460348610454326648213393607260249141273" + "72458700660631558817488152092096282925409171536436" + "78925903600113305305488204665213841469519415116094" + "33057270365759591953092186117381932611793105118548" + "07446237996274956735188575272489122793818301194912" + "98336733624406566430860213949463952247371907021798" + "60943702770539217176293176752384674818467669405132" + "00056812714526356082778577134275778960917363717872" + "14684409012249534301465495853710507922796892589235" + "42019956112129021960864034418159813629774771309960" + "51870721134999999837297804995105973173281609631859" + "50244594553469083026425223082533446850352619311881" + "71010003137838752886587533208381420617177669147303" + "59825349042875546873115956286388235378759375195778" + "18577805321712268066130019278766111959092164201989"; char temp; for (int i = 0; i < s.length(); i++) { temp = s.charAt(i); if (temp >= 48 && temp <= 57) pi.add(s.charAt(i) - '0'); } W = 50; H = s.length() / W + 3; this.setPreferredSize(new Dimension(W * 10, H * 10)); } @Override public void paintComponent(Graphics g) { if (image == null) { image = (BufferedImage) createImage(W, H); int i = 0; boolean end = false; for (int row = 0; row < H && !end; row++) { for (int col = 0; col < W && !end; col++) { image.setRGB(col, row, clut[pi.get(i)]); if (++i == pi.size()) { i = 0; end = true; } } } } 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("Pi raster"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.add(new PiRaster()); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } }); } }