ADD file via upload

PreView.java

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+package control;
+
+import java.awt.Color;
+import java.awt.Graphics;
+
+import javax.swing.JPanel;
+
+import model.Block;
+import model.Box;
+
+
+/**
+ * 预显窗口的实现细节类
+ */
+public class PreView extends JPanel {
+	private Color  frontColor = Color.BLUE;
+	private Box[][] boxes =new Box[4][4];
+
+	private int style, boxWidth=25, boxHeight=25;
+	private boolean isTiled = false;
+
+	/**
+	 * 预显窗口类构造函数
+	 */
+	public PreView() {
+		for (int i = 0; i < boxes.length; i++) {
+			for (int j = 0; j < boxes[i].length; j++)
+				boxes[i][j] = new Box(false);
+		}
+		this.setOpaque(false);//设置透明
+	}
+
+	/**
+	 * 预显窗口类构造函数
+	 * @param backColor Color, 窗口的背景色
+	 * @param frontColor Color, 窗口的前景色
+	 */
+	public PreView( Color frontColor) {
+		this();
+		this.frontColor = frontColor;
+	}
+
+	/**
+	 * 设置预显窗口的方块样式
+	 * @param style int,对应ErsBlock类的STYLES中的28个值
+	 */
+	public void setStyle(int style) {
+		this.style = style;
+		repaint();
+	}
+
+	/**
+	 * 覆盖JComponent类的函数，画组件。
+	 * @param g 图形设备环境
+	 */
+	public void paint(Graphics g) {
+		super.paint(g);
+		// g.drawRect(0, 0, 100, 100);
+		g.draw3DRect(0, 0, 101, 101, true);
+		int key = 0x8000;
+		for (int i = 0; i < boxes.length; i++) {
+			for (int j = 0; j < boxes[i].length; j++) {
+				// Color color = (((key & style) != 0) ? frontColor :
+				// backColor);
+				if ((key & style) != 0) {
+					g.setColor(frontColor);
+					g.fill3DRect(j * boxWidth, i * boxHeight, boxWidth,
+							boxHeight, true);
+					
+				}
+				key >>= 1;
+			}
+		}
+	}
+	}
+