我正在尝试使用嵌套 for 循环在 java 中绘制棋盘图案,但我在使用两种不同的颜色时遇到困难。我知道这个问题以前曾被问过,但还没有被问过板上有两种不同的颜色,而不仅仅是使用背景颜色。我计划使用各个方 block 作为数组来保存检查器位置,因此我确实需要制作每个单独的方 block 。放弃嵌套 for 循环来创建每个方 block 会更好,还是应该坚持使用该快捷方式?如果我坚持使用它,嵌套循环将如何格式化(每种颜色一个)?
最佳答案
创建棋盘格图 block 时,我会传入一个 int
作为 x 坐标和 y 坐标,例如:
import java.awt.Color;
import java.awt.Graphics;
public class CheckerTile {
public static final int WIDTH = 100; //width of each tile
public static final int HEIGHT = 100; //height of each tile, most likely same as width so its a square
public static int currentId = 0; //variable to reference unique id for each tile
private int id; //current id of tile
private int x; //x coordinate
private int y; //y coordinate
private int width; //width of tile
private int height; //height of tile
//Default constructor to take x and y coordinate
public CheckerTile( int x, int y ) {
this.id = currentId++;
this.x = x;
this.y = y;
width = WIDTH;
height = HEIGHT;
}
public int getId()
{
return id;
}
//draws the tile on the panel.
public void draw(Graphics g)
{
//if the checkerTile's id is divisible by 2, draw it red, otherwise draw it black.
g.setColor( id % 2 == 0 ? Color.RED : Color.black);
g.fillRect(x, y, width, height);
}
}
这样我们就可以在棋盘上绘制图 block 了。现在,在创建每个对象时,我们会增加一个 currentId
变量,以便稍后可以使用模运算符为每个对象单独着色。
我假设您正在使用 Swing,因此我决定添加一个 draw(Graphics g)
方法,以便在 Java 中重新绘制时它将使用该 Graphics
对象。如果您使用不同的库,那么您将必须研究如何在板上绘制它。
现在在您的 JPanel
中,它看起来像这样:
//Creates the JPanel, which needs to be added to JFrame object in main
import java.awt.BorderLayout;
import java.awt.Graphics;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class CheckerBoard extends JPanel {
CheckerTile[][] checkerTiles; //2-dimension array of checkerTiles
public CheckerBoard() {
super();
this.setSize(800,800);
checkerTiles = new CheckerTile[9][9];
//This creates the checkerTiles.
for(int i = 0; i < 9; i++)
{
for( int j = 0; j < 9; j++)
{
checkerTiles[i][j] = new CheckerTile( j * CheckerTile.WIDTH, i * CheckerTile.HEIGHT );
}
}
this.setVisible(true);
//Repaint right away to show results.
repaint();
}
//We need to override this to paint the tiles on the board.
@Override
public void paintComponent(Graphics g)
{
for(int i = 0; i < checkerTiles.length; i++)
{
for(int j = 0; j < checkerTiles[i].length; j++)
{
//call the draw method on each tile.
checkerTiles[i][j].draw(g);
}
}
}
//A demo of adding the panel to a frame and showing the tiles.
public static void main(String[] args)
{
//Create the JFrame and add the CheckerBoard we made to it.
JFrame frame = new JFrame();
frame.setSize(800,800);
frame.setLayout(new BorderLayout());
frame.add(new CheckerBoard(), BorderLayout.CENTER);
frame.setVisible(true);
}
}
关于java - 使用嵌套 for 循环绘制两个颜色的棋盘,其中每个方 block 都是它们自己的对象 (Java),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/39373789/