gamecanvas.java

利用java写的俄罗斯方块

/*
 * 游戏中方块显示的画布类
 */
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;

class GameCanvas extends JPanel
{
 private RussiaBox [][]boxes;
 private int rows = 20 , cols = 12;
 private static GameCanvas canvas=null;
 private int boxWidth, boxHeight;//默认为零需要调用fanning函数设置
 private Color blockColor = Color.RED, bgColor = new Color(0,204,204); 
 private EtchedBorder border=new EtchedBorder(EtchedBorder.RAISED,Color.WHITE, new Color(148, 145, 140)) ;
 
 /*
  *采用单件模式,构造函数私有
 */
 private GameCanvas()
 {
  boxes = new RussiaBox[rows][cols];
  
  for(int i = 0; i < boxes.length; i ++)
      for(int j = 0; j<boxes[i].length; j ++)
          boxes[i][j] = new RussiaBox(false);
          
  setBorder(border);
 }
 /*
  *获得GameCanvas实例
  */
 public static GameCanvas getCanvasInstance()
 {
   if(canvas == null)
     canvas = new GameCanvas();
     
    return canvas;
 }
 /*
  *设置画布的背景色
  */
 public void setBgColor(Color bgColor)
 {
      this.bgColor = bgColor;
 }
 /*
 * 获得画布的背景色
 */
 public Color getBgColor()
 {
      return bgColor;
 }
 /*
  *设置方块的颜色
  */
 public void setBlockColor(Color blockColor)
 {
       this.blockColor = blockColor;
 }
 /*
  *方块的颜色
  */
 public Color getBlockColor()
 { 
       return blockColor;
 }
 /*
  *设置画布中方块的行数
  */
 public void setRows(int rows)
 {
      this.rows = rows;
 }
 /*
  *得到画布中方块的行数
  */
 public int getRows()
 {
     return rows;
 } 
 /*
  *设置画布中方块的列数
  */
 public void setCols(int cols)
 {
      this.cols = cols;
 }
 /*
  *得到画布中方块的列数
  */
 public int getCols()
 {
      return cols; 
 }
 /*
  *得到row行,col列的方格
  */
 public RussiaBox getBox(int row, int col)
 {
   if(row >= 0 && row < rows && col >= 0 && col < cols)
       return boxes[row][col];
       
   else 
        return null;
 }
 /*
  *在画布中绘制方块
  */         
 public void paintComponent(Graphics g)
 {
   super.paintComponent(g);
   
   fanning();
   for(int i = 0; i < boxes.length; i ++)
      for(int j = 0; j < boxes[i].length; j ++)
        {
          Color color = boxes[i][j].isColorBox() ? blockColor : bgColor;
          g.setColor(color);
          g.fill3DRect(j * boxWidth, i * boxHeight , boxWidth , boxHeight , true);
        }   
 }
 /*
  *清除第row行
  */
 public void removeLine(int row)
 {
  for(int i = row; i > 0; i --)
    for(int j = 0; j < cols; j ++)
    { 
          boxes[i][j] = (RussiaBox)boxes[i-1][j].clone();
     }
 }
 /*
  *重置 为初始时的状态
  */
 public void reset()
 {
   for(int i = 0; i < boxes.length; i++)
       for(int j = 0 ;j < boxes[i].length; j++)
       {
         boxes[i][j].setColor(false);
       }
    repaint();
 }
 /*
  * 根据窗体的大小自动调整方格的大小
  */
 public void fanning()
 {
   boxWidth = getSize().width / cols;
   boxHeight = getSize().height / rows;
 } 
 
}