Two previous articles: Java implements two Gozi chess game (two) Draws a chess board; Java implements two Gozi chess game (two) Draws a chess piece
In front, we have drawn chessboards and chess pieces. Next, we need to click the screen with the mouse to get the position and make the move (not considering the chess game and the victory or defeat judgment first).
step:
1) Capture the position where the mouse is pressed
2) After coordinate transformation (from pixel position -> 0-19 chessboard position)
3) Update the two-dimensional array that records the status of the board
4) Re-render the drawing board.
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A 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 implementations 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); //Draw horizontal line for(int i=0;i<ROWS;i++) { g.drawLine(x, y+i*span_y, FWidth-x,y+i*span_y); } //Draw vertical line for(int i=0;i<ROWS;i++) { g.drawLine(x+i*span_x, y, x+i*span_x,FHeight-y); } //Draw chess pieces 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 //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("Legal"); 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)//If it is width/2, two matching values will appear at the middle point { 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 // 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 } }The main module code remains unchanged
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 title setTitle("Stand-alone Goji"); Container containerPane =getContentPane(); containerPane.add(drawChessBoard); } public static void main(String[] args) { Main m = new Main(); m.setSize(800, 800); m.setVisible(true); } }Run it
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