snakeview.java

Java class：JavaJava development under the brief description of design patterns

package mvcTest; 

//SnakeView.java 
import javax.swing.*; 
import java.awt.*; 
import java.util.Iterator; 
import java.util.LinkedList; 
import java.util.Observable; 
import java.util.Observer; 

/** 
* MVC模式中得Viewer，只负责对数据的显示,而不用理会游戏的控制逻辑 
*/ 
public class SnakeView implements Observer { 
SnakeControl control = null; 
SnakeModel model = null; 

JFrame mainFrame; 
Canvas paintCanvas; 
JLabel labelScore; 

public static final int canvasWidth = 200; 
public static final int canvasHeight = 300; 

public static final int nodeWidth = 10; 
public static final int nodeHeight = 10; 

public SnakeView(SnakeModel model, SnakeControl control) { 
this.model = model; 
this.control = control; 

mainFrame = new JFrame("GreedSnake"); 

Container cp = mainFrame.getContentPane(); 

// 创建顶部的分数显示 
labelScore = new JLabel("Score:"); 
cp.add(labelScore, BorderLayout.NORTH); 

// 创建中间的游戏显示区域 
paintCanvas = new Canvas(); 
paintCanvas.setSize(canvasWidth + 1, canvasHeight + 1); 
paintCanvas.addKeyListener(control); 
cp.add(paintCanvas, BorderLayout.CENTER); 

// 创建底下的帮助栏 
JPanel panelButtom = new JPanel(); 
panelButtom.setLayout(new BorderLayout()); 
JLabel labelHelp; 
labelHelp = new JLabel("PageUp, PageDown for speed;", JLabel.CENTER); 
panelButtom.add(labelHelp, BorderLayout.NORTH); 
labelHelp = new JLabel("ENTER or R or S for start;", JLabel.CENTER); 
panelButtom.add(labelHelp, BorderLayout.CENTER); 
labelHelp = new JLabel("SPACE or P for pause", JLabel.CENTER); 
panelButtom.add(labelHelp, BorderLayout.SOUTH); 
cp.add(panelButtom, BorderLayout.SOUTH); 

mainFrame.addKeyListener(control); 
mainFrame.pack(); 
mainFrame.setResizable(false); 
mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
mainFrame.setVisible(true); 
} 

void repaint() { 
Graphics g = paintCanvas.getGraphics(); 

//draw background 
g.setColor(Color.WHITE); 
g.fillRect(0, 0, canvasWidth, canvasHeight); 

// draw the snake 
g.setColor(Color.BLACK); 
LinkedList na = model.nodeArray; 
Iterator it = na.iterator(); 
while (it.hasNext()) { 
Node n = (Node) it.next(); 
drawNode(g, n); 
} 

// draw the food 
g.setColor(Color.RED); 
Node n = model.food; 
drawNode(g, n); 

updateScore(); 
} 

private void drawNode(Graphics g, Node n) { 
g.fillRect(n.x * nodeWidth, 
n.y * nodeHeight, 
nodeWidth - 1, 
nodeHeight - 1); 
} 

public void updateScore() { 
String s = "Score: " + model.score; 
labelScore.setText(s); 
} 

public void update(Observable o, Object arg) { 
repaint(); 
} 
}