diff --git a/history/006_snake/src/main/java/com/gitee/drinkjava2/frog/brain/BrainPicture.java b/history/006_snake/src/main/java/com/gitee/drinkjava2/frog/brain/BrainPicture.java
new file mode 100644
index 0000000..2230737
--- /dev/null
+++ b/history/006_snake/src/main/java/com/gitee/drinkjava2/frog/brain/BrainPicture.java
@@ -0,0 +1,397 @@
+package com.gitee.drinkjava2.frog.brain;
+
+import static java.awt.Color.BLACK;
+import static java.awt.Color.RED;
+import static java.awt.Color.WHITE;
+import static java.lang.Math.cos;
+import static java.lang.Math.round;
+import static java.lang.Math.sin;
+
+import java.awt.Color;
+import java.awt.Font;
+import java.awt.Graphics;
+import java.awt.event.KeyAdapter;
+import java.awt.event.KeyEvent;
+import java.awt.image.BufferedImage;
+
+import javax.swing.JPanel;
+
+import com.gitee.drinkjava2.frog.Animal;
+import com.gitee.drinkjava2.frog.Application;
+import com.gitee.drinkjava2.frog.Env;
+import com.gitee.drinkjava2.frog.util.ColorUtils;
+
+/**
+ * BrainPicture show first frog's brain structure, for debug purpose only
+ * 
+ * 这个类用来画出脑图，这不是一个关键类，对脑的运行逻辑无影响，但有了脑图后可以直观地看出脑的3维结构，进行有针对性的改进
+ * 可以用鼠标进行平移、缩放、旋转，以及t、f、l、r,x五个键来选择顶视、前视、左视、右视、斜视这5个方向的视图，以及空格暂停、方向键调整切面
+ * 鼠标的动作定义在MouseAction类中。
+ * 
+ * @author Yong Zhu
+ * @since 1.0
+ */
+@SuppressWarnings("all")
+public class BrainPicture extends JPanel {
+	private static final long serialVersionUID = 1L;
+
+	private static final float D90 = (float) (Math.PI / 2);
+
+	Color picColor = RED;
+	int brainDispWidth; // screen display piexls width
+	float scale; // brain scale
+	int xOffset = 0; // brain display x offset compare to screen
+	int yOffset = 0; // brain display y offset compare to screen
+	float xAngle = D90 * .8f; // brain rotate on x axis
+	float yAngle = D90 / 4; // brain rotate on y axis
+	float zAngle = 0;// brain rotate on z axis
+	int xMask = -1;// x Mask
+	int yMask = -1;// y Mask
+	BufferedImage buffImg;
+	Graphics g;
+	String note;
+	public KeyAdapter keyAdapter;
+
+	public BrainPicture(int x, int y, float brainWidth, int brainDispWidth) {
+		super();
+		this.setLayout(null);// 空布局
+		this.brainDispWidth = brainDispWidth;
+		scale = 0.5f * brainDispWidth / brainWidth;
+		this.setBounds(x, y, brainDispWidth + 1, brainDispWidth + 1);
+		buffImg = new BufferedImage(Env.FROG_BRAIN_DISP_WIDTH, Env.FROG_BRAIN_DISP_WIDTH, BufferedImage.TYPE_INT_RGB);
+		g = buffImg.getGraphics();
+		MouseAction act = new MouseAction(this);
+		this.addMouseListener(act); // 添加鼠标动作监听
+		this.addMouseWheelListener(act);// 添加鼠标滚轮动作监听
+		this.addMouseMotionListener(act);// 添加鼠标移动动作监听
+
+		keyAdapter = new KeyAdapter() {// 处理t,f,l,r，x键盘命令
+			@Override
+			public void keyPressed(KeyEvent e) {
+				switch (e.getKeyCode()) {
+				case KeyEvent.VK_UP:// Y切面向上
+					yMask++;
+					if (yMask > Env.FROG_BRAIN_YSIZE)
+						yMask = Env.FROG_BRAIN_YSIZE;
+					break;
+				case KeyEvent.VK_DOWN:// Y切面向下
+					yMask--;
+					if (yMask < 0)
+						yMask = 0;
+					break;
+				case KeyEvent.VK_LEFT:// x切面向左
+					xMask--;
+					if (xMask < 0)
+						xMask = 0;
+					break;
+				case KeyEvent.VK_RIGHT:// x切面向右
+					xMask++;
+					if (xMask > Env.FROG_BRAIN_XSIZE)
+						xMask = Env.FROG_BRAIN_XSIZE;
+					break;
+				case ' ':// 暂停及继续
+					Application.pauseAction.actionPerformed(null);
+					break;
+				case 'T':// 顶视
+					xAngle = 0;
+					yAngle = 0;
+					zAngle = 0;
+					break;
+				case 'F':// 前视
+					xAngle = D90;
+					yAngle = 0;
+					zAngle = 0;
+					break;
+				case 'L':// 左视
+					xAngle = D90;
+					yAngle = D90;
+					zAngle = 0;
+					break;
+				case 'R':// 右视
+					xAngle = D90;
+					yAngle = -D90;
+					zAngle = 0;
+					break;
+				case 'X':// 斜视
+					xAngle = D90 * .8f;
+					yAngle = D90 / 4;
+					zAngle = 0;
+					break;
+				default:
+				}
+			}
+		};
+		addKeyListener(keyAdapter);
+		this.setFocusable(true);
+	}
+
+	public void drawZone(Zone o) {// 在脑图上画一个正立方体Zone框架，视角是TopView
+		drawCuboid(o.x - o.r, o.y - o.r, o.z - o.h * .5f, o.r + o.r, o.r + o.r, o.h);
+	}
+
+	public void drawCuboid(Cuboid c) {// 在脑图上画一个长立方体框架，视角是TopView
+		drawCuboid(c.x, c.y, c.z, c.xe, c.ye, c.ze);
+	}
+
+	public void drawCuboid(float x, float y, float z, float xe, float ye, float ze) {// 在脑图上画一个长立方体框架，视角是TopView
+		drawLine(x, y, z, x + xe, y, z);// 画立方体的下面边
+		drawLine(x + xe, y, z, x + xe, y + ye, z);
+		drawLine(x + xe, y + ye, z, x, y + ye, z);
+		drawLine(x, y + ye, z, x, y, z);
+
+		drawLine(x, y, z, x, y, z + ze);// 画立方体的中间边
+		drawLine(x + xe, y, z, x + xe, y, z + ze);
+		drawLine(x + xe, y + ye, z, x + xe, y + ye, z + ze);
+		drawLine(x, y + ye, z, x, y + ye, z + ze);
+
+		drawLine(x, y, z + ze, x + xe, y, z + ze);// 画立方体的上面边
+		drawLine(x + xe, y, z + ze, x + xe, y + ye, z + ze);
+		drawLine(x + xe, y + ye, z + ze, x, y + ye, z + ze);
+		drawLine(x, y + ye, z + ze, x, y, z + ze);
+	}
+
+	public void drawCell(Cell c) {// 从zone1到z2中心画一条线
+		if (c == null)
+			return;
+		if (c.body != null) {
+			drawZone(c.body);
+			if (c.input != null)
+				drawLine(c.input.x, c.input.y, c.input.z, c.body.x, c.body.y, c.body.z);
+			if (c.output != null)
+				drawLine(c.output.x, c.output.y, c.output.z, c.body.x, c.body.y, c.body.z);
+		}
+
+	}
+
+	/*-
+	  画线，固定以top视角的角度，所以只需要从x1,y1画一条到x2,y2的直线	
+		绕 x 轴旋转 θ
+		x, y.cosθ-zsinθ, y.sinθ+z.cosθ
+	
+		绕 y 轴旋转 θ 
+		z.sinθ+x.cosθ,  y,  z.cosθ-x.sinθ	
+		
+		 绕 z 轴旋转 θ
+		x.cosθ-y.sinθ, x.sinθ+y.consθ, z
+	 -*/
+	public void drawLine(float px1, float py1, float pz1, float px2, float py2, float pz2) {
+		double x1 = px1 - Env.FROG_BRAIN_XSIZE / 2;
+		double y1 = -py1 + Env.FROG_BRAIN_YSIZE / 2;// 屏幕的y坐标是反的，显示时要正过来
+		double z1 = pz1 - Env.FROG_BRAIN_ZSIZE / 2;
+		double x2 = px2 - Env.FROG_BRAIN_XSIZE / 2;
+		double y2 = -py2 + Env.FROG_BRAIN_YSIZE / 2;// 屏幕的y坐标是反的，显示时要正过来
+		double z2 = pz2 - Env.FROG_BRAIN_ZSIZE / 2;
+		x1 = x1 * scale;
+		y1 = y1 * scale;
+		z1 = z1 * scale;
+		x2 = x2 * scale;
+		y2 = y2 * scale;
+		z2 = z2 * scale;
+		double x, y, z;
+		y = y1 * cos(xAngle) - z1 * sin(xAngle);// 绕x轴转
+		z = y1 * sin(xAngle) + z1 * cos(xAngle);
+		y1 = y;
+		z1 = z;
+
+		x = z1 * sin(yAngle) + x1 * cos(yAngle);// 绕y轴转
+		// z = z1 * cos(yAngle) - x1 * sin(yAngle);
+		x1 = x;
+		// z1 = z;
+
+		x = x1 * cos(zAngle) - y1 * sin(zAngle);// 绕z轴转
+		y = x1 * sin(zAngle) + y1 * cos(zAngle);
+		x1 = x;
+		y1 = y;
+
+		y = y2 * cos(xAngle) - z2 * sin(xAngle);// 绕x轴转
+		z = y2 * sin(xAngle) + z2 * cos(xAngle);
+		y2 = y;
+		z2 = z;
+
+		x = z2 * sin(yAngle) + x2 * cos(yAngle);// 绕y轴转
+		// z = z2 * cos(yAngle) - x2 * sin(yAngle);
+		x2 = x;
+		// z2 = z;
+
+		x = x2 * cos(zAngle) - y2 * sin(zAngle);// 绕z轴转
+		y = x2 * sin(zAngle) + y2 * cos(zAngle);
+		x2 = x;
+		y2 = y;
+
+		g.setColor(picColor);
+		g.drawLine((int) round(x1) + Env.FROG_BRAIN_DISP_WIDTH / 2 + xOffset,
+				(int) round(y1) + Env.FROG_BRAIN_DISP_WIDTH / 2 + yOffset,
+				(int) round(x2) + Env.FROG_BRAIN_DISP_WIDTH / 2 + xOffset,
+				(int) round(y2) + Env.FROG_BRAIN_DISP_WIDTH / 2 + yOffset);
+	}
+
+	public void drawLine(Zone a, Zone b) {
+		drawLine(a.x, a.y, a.z, b.x, b.y, b.z);
+	}
+
+	/** 画点，固定以top视角的角度，所以只需要在x1,y1位置画一个点 */
+	public void drawPoint(float px1, float py1, float pz1, float r) {
+		double x1 = px1 - Env.FROG_BRAIN_XSIZE / 2;
+		double y1 = -py1 + Env.FROG_BRAIN_YSIZE / 2;// 屏幕的y坐标是反的，显示时要正过来
+		double z1 = pz1 - Env.FROG_BRAIN_ZSIZE / 2;
+		x1 = x1 * scale;
+		y1 = y1 * scale;
+		z1 = z1 * scale;
+		double x, y, z;
+		y = y1 * cos(xAngle) - z1 * sin(xAngle);// 绕x轴转
+		z = y1 * sin(xAngle) + z1 * cos(xAngle);
+		y1 = y;
+		z1 = z;
+
+		x = z1 * sin(yAngle) + x1 * cos(yAngle);// 绕y轴转
+		// z = z1 * cos(yAngle) - x1 * sin(yAngle);
+		x1 = x;
+		// z1 = z;
+
+		x = x1 * cos(zAngle) - y1 * sin(zAngle);// 绕z轴转
+		y = x1 * sin(zAngle) + y1 * cos(zAngle);
+		x1 = x;
+		y1 = y;
+
+		g.setColor(picColor);
+		g.fillOval(round((float) x1 + Env.FROG_BRAIN_DISP_WIDTH / 2 + xOffset - r * scale * .5f),
+				round((float) y1 + Env.FROG_BRAIN_DISP_WIDTH / 2 + yOffset - r * scale * .5f), round(r * scale),
+				round(r * scale));
+	}
+
+	public void drawText(float px1, float py1, float pz1, String text) {
+		drawText(px1, py1, pz1, text, 12);
+	}
+
+	public void drawText(float px1, float py1, float pz1, String text, float textSize) {
+		double x1 = px1 - Env.FROG_BRAIN_XSIZE / 2;
+		double y1 = -py1 + Env.FROG_BRAIN_YSIZE / 2;// 屏幕的y坐标是反的，显示时要正过来
+		double z1 = pz1 - Env.FROG_BRAIN_ZSIZE / 2;
+		x1 = x1 * scale;
+		y1 = y1 * scale;
+		z1 = z1 * scale;
+		double x, y, z;
+		y = y1 * cos(xAngle) - z1 * sin(xAngle);// 绕x轴转
+		z = y1 * sin(xAngle) + z1 * cos(xAngle);
+		y1 = y;
+		z1 = z;
+
+		x = z1 * sin(yAngle) + x1 * cos(yAngle);// 绕y轴转
+		// z = z1 * cos(yAngle) - x1 * sin(yAngle);
+		x1 = x;
+		// z1 = z;
+
+		x = x1 * cos(zAngle) - y1 * sin(zAngle);// 绕z轴转
+		y = x1 * sin(zAngle) + y1 * cos(zAngle);
+		x1 = x;
+		y1 = y;
+
+		g.setColor(picColor);
+		g.setFont(new Font(Font.SANS_SERIF, Font.PLAIN, (int) round(textSize * scale)));
+		g.drawString(text, (int) round(x1) + Env.FROG_BRAIN_DISP_WIDTH / 2 + xOffset,
+				(int) round(y1) + Env.FROG_BRAIN_DISP_WIDTH / 2 + yOffset);
+
+	}
+
+	private static Cuboid brain = new Cuboid(0, 0, 0, Env.FROG_BRAIN_XSIZE, Env.FROG_BRAIN_YSIZE, Env.FROG_BRAIN_ZSIZE);
+
+	public void drawBrainPicture() {// 在这个方法里进行动物的三维脑结构的绘制,蛇是青蛙的子类，所以也可以当参数传进来
+		if (!Env.SHOW_FIRST_ANIMAL_BRAIN)
+			return;
+		Animal a = Env.getShowAnimal(); // 显示第一个青蛙或蛇
+		if (a == null || !a.alive)
+			return;
+		g.setColor(WHITE);// 先清空旧图
+		g.fillRect(0, 0, brainDispWidth, brainDispWidth);
+		g.setColor(BLACK); // 画边框
+		g.drawRect(0, 0, brainDispWidth, brainDispWidth);
+		setPicColor(BLACK);
+		drawCuboid(brain);// 先把脑的框架画出来
+		drawText(100, 0, 0, "x");
+		drawText(0, 100, 0, "y");
+		drawText(0, 0, 100, "z");
+
+		for (Organ organ : a.organs)// 每个器官负责画出自已在脑图中的位置和形状
+			organ.drawOnBrainPicture(a, this); // each organ draw itself
+		setPicColor(RED);
+		drawLine(0, 0, 0, 1, 0, 0);
+		drawLine(0, 0, 0, 0, 1, 0);
+		drawLine(0, 0, 0, 0, 0, 1);
+
+		for (Cell cell : a.cells) {
+			if (cell != null && cell.energy > 20) {
+				setPicColor(ColorUtils.grayColor(cell.energy));// 用灰度表示活跃度
+				if (cell.body != null)
+					drawZone(cell.body);
+			}
+		}
+
+		g.setColor(Color.black);
+		if (note != null) // 全局注释
+			g.drawString(note, 30, 55);
+		Graphics g2 = this.getGraphics();
+		g2.drawImage(buffImg, 0, 0, this);// 利用缓存避免画面闪烁，这里输出缓存图片
+	}
+
+	public static void setNote(String note) {
+		Application.brainPic.note = note;
+	}
+
+	// getters & setters
+	public float getScale() {
+		return scale;
+	}
+
+	public void setScale(float scale) {
+		this.scale = scale;
+	}
+
+	public float getxAngle() {
+		return xAngle;
+	}
+
+	public void setxAngle(float xAngle) {
+		this.xAngle = xAngle;
+	}
+
+	public float getyAngle() {
+		return yAngle;
+	}
+
+	public void setyAngle(float yAngle) {
+		this.yAngle = yAngle;
+	}
+
+	public float getzAngle() {
+		return zAngle;
+	}
+
+	public void setzAngle(float zAngle) {
+		this.zAngle = zAngle;
+	}
+
+	public void setPicColor(Color color) {
+		this.picColor = color;
+	}
+
+	public Color getPicColor() {
+		return picColor;
+	}
+
+	public int getxOffset() {
+		return xOffset;
+	}
+
+	public void setxOffset(int xOffset) {
+		this.xOffset = xOffset;
+	}
+
+	public int getyOffset() {
+		return yOffset;
+	}
+
+	public void setyOffset(int yOffset) {
+		this.yOffset = yOffset;
+	}
+
+}