之前的两篇文章：Java实现两人五子棋游戏(二) 画出棋盘；Java实现两人五子棋游戏(三) 画出棋子
前面，我们已经画好的棋盘和棋子，接下来，我们要通过鼠标点击屏幕获取落子位置并落子（先不考虑行棋方和胜负判断）。
步骤：
1）捕捉鼠标按下的位置
2）经过坐标变换（由像素位置->0-19的棋盘位置）
3）更新记录棋盘状态的二维数组
4）重新渲染绘制棋盘。
-------------落子动作代码示例如下--------------
一个棋子类Chessman.java
package xchen.test.simpleGobang; public class Chessman { private int color;//1-white，0-black private boolean placed = false; public Chessman(int color,boolean placed){ this.color=color; this.placed=placed; } public boolean getPlaced() { return placed; } public void setPlaced(boolean placed) { this.placed = placed; } public int getColor() { return color; } public void setColor(int color) { this.color = color; } } DrawChessBoard.java
package xchen.test.simpleGobang; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.RadialGradientPaint; import java.awt.Image; import java.awt.Toolkit; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import java.awt.Color; import javax.swing.JPanel; public class DrawChessBoard extends JPanel implements MouseListener{ final static int BLACK=0; final static int WHITE=1; public int chessColor = BLACK; int chessman_width=30; public Image boardImg; final private int ROWS = 19; Chessman[][] chessStatus=new Chessman[ROWS+1][ROWS+1]; public DrawChessBoard() { boardImg = Toolkit.getDefaultToolkit().getImage("res/drawable/chessboard2.png"); if(boardImg == null) System.err.println("png do not exist"); addMouseListener(this); } @Override protected void paintComponent(Graphics g) { // TODO Auto-generated method stub System.out.println("DRAW!!"); super.paintComponent(g); int imgWidth = boardImg.getHeight(this); int imgHeight = boardImg.getWidth(this); int FWidth = getWidth(); int FHeight= getHeight(); int x=(FWidth-imgWidth)/2; int y=(FHeight-imgHeight)/2; int span_x=imgWidth/ROWS; int span_y=imgHeight/ROWS; g.drawImage(boardImg, x, y, null); //画横线 for(int i=0;i<ROWS;i++) { g.drawLine(x, y+i*span_y, FWidth-x,y+i*span_y); } //画竖线 for(int i=0;i<ROWS;i++) { g.drawLine(x+i*span_x, y, x+i*span_x,FHeight-y); } //画棋子 for(int i=0;i<ROWS+1;i++) { for(int j=0;j<ROWS+1;j++) { if(chessStatus[i][j]!=null&&chessStatus[i][j].getPlaced()==true) { System.out.println("draw chessman "+i+" "+j); int pos_x=x+i*span_x; int pos_y=y+j*span_y; float radius_b=40; float radius_w=80; float[] fractions = new float[]{0f,1f}; java.awt.Color[] colors_b = new java.awt.Color[]{Color.BLACK,Color.WHITE}; Color[] colors_w = new Color[]{Color.WHITE,Color.BLACK}; RadialGradientPaint paint; if(chessStatus[i][j].getColor()==1) { System.out.println("draw white chess"); paint = new RadialGradientPaint(pos_x-chessman_width/2f, pos_y-chessman_width/2f, radius_w*2, fractions, colors_w); }else{ System.out.println("draw black chess"); paint = new RadialGradientPaint(pos_x-chessman_width/2f, pos_y-chessman_width/2f, radius_b*2, fractions, colors_b); } ((Graphics2D)g).setPaint(paint); ((Graphics2D)g).fillOval(pos_x-chessman_width/2,pos_y-chessman_width/2,chessman_width,chessman_width); } } } } @Override //当用户按下鼠标按钮时发生 public void mousePressed(MouseEvent e) { int point_x=e.getX(); int point_y=e.getY(); int imgWidth = boardImg.getHeight(this); int imgHeight = boardImg.getWidth(this); int FWidth = getWidth(); int FHeight= getHeight(); int x=(FWidth-imgWidth)/2; int y=(FHeight-imgHeight)/2; int span_x=imgWidth/ROWS; int span_y=imgHeight/ROWS; System.out.println("press"); int status_x = 0; int status_y = 0; if(point_x>=x && point_x<=x+imgWidth && point_y>=y && point_y <= y+imgHeight) { System.out.println("合法"); for(int i=0;i<ROWS+1;i++) { if(point_x>=x-chessman_width/2+1+i*span_x) { if(point_x<=x+chessman_width/2-1+i*span_x)//如果是width/2会在中间点出现两个匹配值 { System.out.println("point x "+i+" "+point_x+" "+(x-chessman_width/2+i*span_x)+" "+(x+chessman_width/2+i*span_x)); status_x = i; } } } for(int i=0;i<ROWS+1;i++) { if(point_y>=y-chessman_width/2+1+i*span_y) { if(point_y <= y+chessman_width/2-1+i*span_y) { System.out.println("point y "+i+" "+point_y+" "+(y-chessman_width/2+1+i*span_y)+" "+(y+chessman_width/2-1+i*span_y)); status_y = i; } } } Chessman chessman = new Chessman(BLACK, true); chessStatus[status_x][status_y]=chessman; repaint(); } System.out.println(status_x+" "+status_y+" "+chessStatus[status_x][status_y].getColor()+" "+chessStatus[status_x][status_y].getPlaced()); } @Override //当用户按下并松开鼠标按钮时发生 public void mouseClicked(MouseEvent e) { // TODO Auto-generated method stub } @Override public void mouseReleased(MouseEvent e) { // TODO Auto-generated method stub } @Override public void mouseEntered(MouseEvent e) { // TODO Auto-generated method stub } @Override public void mouseExited(MouseEvent e) { // TODO Auto-generated method stub } } 主模块代码不变
package xchen.test.simpleGobang; import java.awt.Container; import javax.swing.JFrame; import xchen.test.simpleGobang.DrawChessBoard; public class Main extends JFrame{ private DrawChessBoard drawChessBoard; public Main() { drawChessBoard = new DrawChessBoard(); //Frame标题 setTitle("单机五子棋"); Container containerPane =getContentPane(); containerPane.add(drawChessBoard); } public static void main(String[] args) { Main m = new Main(); m.setSize(800, 800); m.setVisible(true); } } 运行一下
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