【发布时间】：2018-11-16 21:38:39
【问题描述】：
这是我的蛇代码。 system("cls") 一点效率都没有，控制台闪烁……
#include <iostream>
#include <string>
#include <windows.h>
#include <cstdlib>
#include <ctime>
#include <conio.h>
using namespace std;
bool status = false, win = false;
struct Snake {
int index_i;
int index_j;
};
class Game {
private:
enum eDir { UP, RIGHT, DOWN, LEFT };
eDir direction;
const int height = 25, width = 50, max_size = (height - 2)*(width - 2);
int snake_size = 1, food_x, food_y, snake_x, snake_y, score, speed;
char snake = '@', food = '*', frame = '#';
Snake *snake_body = new Snake[max_size];
public:
Game() {
snake_x = height / 2;
snake_y = width / 2;
snake_body[0].index_i = snake_x;
snake_body[0].index_j = snake_y;
PutFood();
}
~Game() {
delete[] snake_body;
}
void DrawTable() {
system("cls");
for (int i = 0; i < height; i++) {
for (int j = 0; j < width; j++) {
if (!i || i == height - 1 || !j || j == width - 1) {
cout << frame;
}
else if (i == food_x && j == food_y) {
cout << food;
}
else if (Check(i, j)) {
cout << snake;
}
else {
cout << " ";
}
}
cout << endl;
}
cout << "Your current score is: " << score;
}
void Control() {
if (_kbhit()) {
switch (_getch()) {
case 'w':
direction = UP;
break;
case 'a':
direction = LEFT;
break;
case 's':
direction = DOWN;
break;
case 'd':
direction = RIGHT;
break;
}
}
}
void Process() {
switch (direction) {
case UP:
snake_x--;
Move();
break;
case LEFT:
snake_y--;
Move();
break;
case DOWN:
snake_x++;
Move();
break;
case RIGHT:
snake_y++;
Move();
break;
}
}
void Move() {
/*for (int i = 0; i < snake_size; i++) { tail collision logic (if you try to reverse your move, you die). Optional.
if (snake_body[i].index_i == snake_x && snake_body[i].index_j == snake_y) {
status = true;
return;
}
}*/
snake_body[snake_size].index_i = snake_x;
snake_body[snake_size].index_j = snake_y;
if (!snake_x || snake_x == height - 1 || !snake_y || snake_y == width - 1) { // collision logic
status = true;
}
else if (snake_x == food_x && snake_y == food_y) {
snake_size++;
score++;
if (snake_size == max_size) {
win = true;
return;
}
PutFood();
}
else {
for (int index = 0; index < snake_size; index++) {
snake_body[index].index_i = snake_body[index + 1].index_i;
snake_body[index].index_j = snake_body[index + 1].index_j;
}
snake_body[snake_size].index_i = 0;
snake_body[snake_size].index_j = 0;
}
Sleep(speed);
}
void PutFood() {
srand(time(NULL));
food_x = rand() % (height - 2) + 2;
food_y = rand() % (width - 2) + 2;
}
bool Check(int i, int j) {
for (int k = 0; k < snake_size; k++) {
if (i == snake_body[k].index_i && j == snake_body[k].index_j) {
return true;
}
}
return false;
}
int getScore() {
return score;
}
void setSpeed(int s) {
speed = s;
}
};
int main() {
Game snake_game;
char exit;
string error = "Invalid choice, please choose 1-3";
int speed, choice;
cout << "Contol: WASD" << endl << "Set the difficulty level: " << endl << "1. Easy" << endl << "2. Normal" << endl << "3. Hard" << endl;
label:
cin >> choice;
try {
if (choice < 1 || choice > 3) throw error;
}
catch (char *error) {
cout << error << endl;
goto label;
}
switch (choice) {
case 1:
speed = 250;
break;
case 2:
speed = 75;
break;
case 3:
speed = 0;
break;
}
snake_game.setSpeed(speed);
while (!status && !win) {
snake_game.DrawTable();
snake_game.Control();
snake_game.Process();
}
if (status && !win) {
system("cls");
cout << "YOU LOST! Your score is: " << snake_game.getScore() << endl;
}
if (win) {
system("cls");
cout << "Congratulations! You won the game!" << endl << "Your score is: " << snake_game.getScore() << endl;
}
cin >> exit;
return 0;
}
【问题讨论】：
-
在标准 C++ 中，您的选择非常有限，因为该语言中没有“控制台”的概念。
system("cls");实际上是运行整个 Windows 程序来清除控制台。您可以考虑使用单独的图形库进行渲染，但如果您开始使用 C++，这可能会非常令人困惑。 -
Windows提供多种控制台处理功能-docs.microsoft.com/en-us/windows/console/console-functions
-
而要重绘屏幕，您只需要擦除尾部并添加新头部即可。你不需要重新绘制整个东西。