ADD file via upload

snake.cpp

@@ -0,0 +1,203 @@
+
+#include <graphics.h>
+#include <windows.h>
+#include <iostream>
+#include <stdio.h>
+#include <conio.h>
+#include<easyx.h>
+#include<time.h>
+#define NodeWidth 40
+typedef struct {
+	int x;
+	int y;
+}Node;
+
+void paintGrid()
+{
+	for (int y = 0; y <= 600; y += NodeWidth)
+	{
+		line(0, y, 800, y);
+	}
+	for (int x = 0; x <= 800; x += NodeWidth)
+	{
+		line(x, 0, x, 600);
+	}
+}
+void paintSnake(Node* snake, int n)
+{
+	int left, top, right, bottom;
+	for (int i = 0; i < n; i++)
+	{
+		left = snake[i].x * NodeWidth;
+		top = snake[i].y * NodeWidth;
+		right = (snake[i].x + 1) * NodeWidth;
+		bottom = (snake[i].y + 1) * NodeWidth;
+		solidrectangle(left, top, right, bottom);
+	}
+}
+enum direction
+{
+	eUp,
+	eDown,
+	eLeft,
+	eRight
+};
+Node snakeMove(Node* snake, int length, int direction)
+{
+	Node tail = snake[length - 1];
+	for (int i = length - 1; i > 0; i--)
+	{
+		snake[i] = snake[i - 1];
+	}
+	Node NewHead;
+	NewHead = snake[0];
+	if (direction == eUp)
+	{
+		NewHead.y--;
+	}
+	else if (direction == eDown)
+	{
+		NewHead.y++;
+	}
+	else if (direction == eLeft)
+	{
+		NewHead.x--;
+	}
+	else if (direction == eRight)
+	{
+		NewHead.x++;
+	}
+	snake[0] = NewHead;
+	return tail;
+}
+void changeDirection(enum direction* pD)
+{
+	if (_kbhit() != 0)
+	{
+		char c = _getch();
+		switch (c)
+		{
+		case'w':
+			if (*pD != eDown)
+				*pD = eUp;
+			break;
+		case's':
+			if (*pD != eUp)
+				*pD = eDown;
+			break;
+
+		case'a':
+			if (*pD != eRight)
+				*pD = eLeft;
+			break;
+
+		case'd':
+			if (*pD != eLeft)
+				*pD = eRight;
+			break;
+
+		}
+
+	}
+}
+
+Node createFood(Node* snake, int length)
+{
+	Node food;
+
+	while (1)
+	{
+		food.x = rand() % (800 / NodeWidth);
+		food.y = rand() % (600 / NodeWidth);
+		int i;
+		for (i = 0; i < length; i++)
+		{
+			if ((food.x == snake[i].x) && (food.y == snake[i].y))
+			{
+				break;
+			}
+		}
+		if (i < length)
+			continue;
+		else
+			break;
+	}
+	return food;
+}
+
+void paintFood(Node food)
+{
+	int left, right, top, bottom;
+	left = food.x * NodeWidth;
+	top = food.y * NodeWidth;
+	right = (food.x + 1) * NodeWidth;
+	bottom = (food.y + 1) * NodeWidth;
+	setfillcolor(YELLOW);
+	solidrectangle(left, top, right, bottom);
+	setfillcolor(WHITE);
+}
+bool IsGameover(Node* snake, int length)
+{
+	if (snake[0].x<0 || snake[0].x>(800 / NodeWidth))
+		return true;
+	if (snake[0].y<0 || snake[0].y>(600 / NodeWidth))
+		return true;
+	for (int i = 1; i < length; i++)//0改为1
+	{
+		if (snake[0].x == snake[i].x && snake[0].y == snake[i].y)
+			return true;
+	}
+	return false;
+}
+void reset(Node* snake, int* length, enum direction* d)
+{
+	snake[0] = Node{ 5,7 };
+	snake[1] = Node{ 4,7 };
+	snake[2] = Node{ 3,7 };
+	snake[3] = Node{ 2,7 };
+	snake[4] = Node{ 1,7 };
+	*length = 5;
+	*d = eRight;
+}
+
+int main()
+{
+	initgraph(800, 600);
+	setbkcolor(RGB(164, 50, 200));
+	cleardevice();
+	paintGrid();
+
+	Node snake[100] = { {5,7},{4,7},{3,7},{2,7},{1,7} };
+	int length = 5;
+	enum direction d = eRight;
+	srand(unsigned int(time(NULL)));
+	Node food = createFood(snake, length);
+
+	while (1)
+	{
+		cleardevice();
+		paintGrid();
+		paintSnake(snake, length);
+		paintFood(food);
+		Sleep(500);
+		changeDirection(&d);
+		Node lastTail = snakeMove(snake, length, d);
+		if (snake[0].x == food.x && snake[0].y == food.y)
+		{
+			if (length < 100)
+			{
+				snake[length] = lastTail;
+				length++;
+			}
+			food = createFood(snake, length);
+		}
+		if (IsGameover(snake, length) == true)
+		{
+			reset(snake, &length, &d);
+			food = createFood(snake, length);
+		}
+	}
+
+	closegraph();
+	return 0;
+}