创建一个多彩多姿的板

我要创建一个多色板，从第一个方块开始为黑色，然后是蓝色，红色和黄色，方块是对角填充的，没有空的彩色方块。 我知道我的算法是错误的，但我不知道如何解决它。 目前，我的代码打印出来像这样

import javax.swing.JFrame; import javax.swing.JPanel; import java.awt.Color; import java.awt.Dimension; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Insets; public class Grid extends JPanel { private static final long serialVersionUID = 1L; public static final int GRID_COUNT = 8; private Color[] colors = { Color.black, Color.yellow, Color.red, Color.blue }; private int colorIndex = 0; public void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D graphics = (Graphics2D) g; graphics.setColor(Color.black); Dimension size = getSize(); Insets insets = getInsets(); int w = size.width - insets.left - insets.right; int h = size.height - insets.top - insets.bottom; int sqrWidth = (int)((double)w / GRID_COUNT); int sqrHeight = (int)((double)h / GRID_COUNT); for (int row = 0; row < GRID_COUNT; row++) { for (int col = 0; col < GRID_COUNT; col++) { int x = (int) (row * (double) w / GRID_COUNT); int y = (int) (col * (double) h / GRID_COUNT); if ((row + col) % 2 == 0) { int colorIndex = (row + col) % 4; graphics.fillRect(x, y, sqrWidth, sqrHeight); graphics.setColor(colors[colorIndex]); colorIndex = (colorIndex + 1) % colors.length; } } public static void main(String[] args) { Grid grid = new Grid(); grid.setPreferredSize(new Dimension(400, 400)); JFrame frame = new JFrame("Grid"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.add(grid); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } 

}

Answer 1

我们来看看模式：

 Bk Gr Pn Bl Gr Pn Bl Bk Pn Bl Bk Gr Bl Bk Gr Pn 

但为了简单起见，让我们调用Bk 0，Gr 1，Pn 2和Bl 3来得到：

 0 1 2 3 1 2 3 0 2 3 0 1 3 0 1 2 

通过为每个图块计算tile[x][y] = (x + y) % 4 ，并使用查找表将这些数字转换为颜色（使用枚举，或者不是指定整数值tile[x][y] = (x + y) % 4可以轻松生成此模式使用整数作为颜色表中的查找并将颜色分配给图块）

如果你以前从未见过它，％4的意思是“除以4并返回除法的剩余部分”。

Answer 2

有两个错误，我看到，第一个错误是你的模式，你想要从黑色，“然后蓝色，红色和黄色”，但你做了

  private Color[] colors = { Color.black, Color.yellow, Color.red, Color.blue }; 

改变这个

第二个错误是你的程序是均匀计数，意味着它是均匀填充矩形，2,4,6,8 ..使你的程序将在每个矩形上进行，这是灰色的…

Answer 3

我已经快速完成了代码，有很多小东西让我感到困惑。

您的颜色计算已被删除，因为您的原始代码正在跳过每隔一个单元格…

if ((row + col) % 2 == 0) {

这意味着当你试图确定颜色时，你没有得到你期望的颜色。

你也在行循环中而不是在列循环中设置单元格的颜色，这对我来说似乎很奇怪……

（我添加了文本进行调试，随意摆脱它）

 import java.awt.Color; import java.awt.Dimension; import java.awt.EventQueue; import java.awt.FontMetrics; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Insets; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.UIManager; import javax.swing.UnsupportedLookAndFeelException; public class Grid { private static final long serialVersionUID = 1L; public static final int GRID_COUNT = 8; private Color[] colors = {Color.black, Color.yellow, Color.red, Color.blue}; public static void main(String[] args) { new Grid(); } public Grid() { EventQueue.invokeLater(new Runnable() { @Override public void run() { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) { } JFrame frame = new JFrame("Grid"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.add(new GridPane()); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } }); } public class GridPane extends JPanel { @Override public Dimension getPreferredSize() { return new Dimension(200, 200); } @Override public void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D graphics = (Graphics2D) g; graphics.setColor(Color.black); Dimension size = getSize(); Insets insets = getInsets(); int w = size.width - insets.left - insets.right; int h = size.height - insets.top - insets.bottom; FontMetrics fm = graphics.getFontMetrics(); int sqrWidth = (int) ((double) w / GRID_COUNT); int sqrHeight = (int) ((double) h / GRID_COUNT); int colorIndex = 0; for (int row = 0; row < GRID_COUNT; row++) { for (int col = 0; col < GRID_COUNT; col++) { int x = (int) (col * sqrWidth); int y = (int) (row * sqrHeight); colorIndex = (row + col) % 4; graphics.setColor(colors[colorIndex]); graphics.fillRect(x, y, sqrWidth, sqrHeight); String text = row + "/" + col; graphics.setColor(Color.WHITE); graphics.drawString( text, x + ((sqrWidth - fm.stringWidth(text)) / 2), y + ((sqrHeight - fm.getHeight()) / 2) + fm.getAscent()); } } } } }