Name: 編碼-自己動手!蛇!- 從零開始編程(快速簡單的C++) (Code-It-Yourself! Snake! - Programming from Scratch (Quick and Simple C++))
Uploaded: 2021-01-14T10:15:12.000Z
Duration: 19 min 2 s
Description: 【看影片學英語】數萬部 YouTube 影片，搭配英漢字典即點即查，輕鬆掌握單字發音與用法，長久累積看電影不必再看字幕。

程度副詞

Yes, I am on my holidays and it's incredibly help.

So I'm gonna keep this one quick and simple.

Of course, I am talking classic retro snake really here in the console so you can see a snake here on I'm stealing from the snakes perspective, which could be quite a controversial way to do snake.

I remember this from the knock earphones on.

Of course, the snake grows as we pick up food and wee accumulator school.

And if the snake hits the wall or himself, that's the end of the game.

See the snake sent into a skeleton and we have to press space to play again.

It's not very many lines of code because I'm working from my possible man cave today.

I'm afraid we don't have as many luxuries as we usually do.

So I'm filming in a slightly lower resolution.

And of course I don't have my voice over microphone.

However, snake is so simple, I don't believe we need any of that to get the point across.

If you watch my videos, you'll know how my counsel programs go by now.

First thing we do is create extended blank council program, and then we'll want to have a screen buffer to it using the create console screen buffer.

I'll make sure there's some little taps Somewhere around here you can click on those.

We show exactly how this code works and what it does.

And, of course, what want to stop the screen with on screen Right now, I'm using 1 20 by 80.

I'm just going to been off the airport here, so we've got more screen to look at the code, and I'm going to create a simple game.

Luke, that's usually my game with dust is displayed.

Scream if it to the screen using the right counsel output character.

Like all my simple council games, we could break it down into three stages.

Logic on the third is displaced off to the player I've decided fundamentally are snake is going to be a link list.

This means I'm not going to have to derail anywhere story with snake segments up.

So I need a structure which represents a snake segment to store in our list, and this is very simply going to be on X and y.

Alternatively, I could stop the positions of the snakes head in snake tail.

And as the head moves along each time the tail also moves along.

I may take some sort of history of how the tail should fall in the head.

I think this might get a little bit complicated.

So instead, I'm just going to have a league list where each element in the list is a segment of the snakes body.

So each segment is just going to be a simple structure containing an X and Y permitted.

Therefore, we can create a little ist object to store a snake.

However, the snake needs some sort of default state.

I'm going to use the static initialize a list which which improved now in modern sea.

So for each element of the snake, I'm going to start some coordinates, and my snake is going to start at 60 15 which is the 60th column across the 15 throw down on the council.

No, there's still the second segment now 61 Common 15.

And I'm gonna keep doing this all the way until I've got 10 segments of snake all in a line ours only on screen.

You guys need some game state variables to so very simply, I'm going to have the location of where the food this food X and y go.

To maintain the score, I'm going to keep a variable, which is snake direction on.

This is going to be for the compass points, so zero will be pointing.

No one will be pointing east to south and freeze West compass points.

So the snake is going to start off heading west on Finally, I'm going to have a 1,000,000,000 for be debt.

This will be the end of game condition would Usually we're gonna work backwards this time.

Of course, somebody is doing works right outside.

When I decide to start building, see if it's going to take very long.

So each famous gable today, the first thing I want to do is clear the screen.

I'm doing this by simply drawing space to every element of the screen buffer and then going to draw some furniture onto the screen.

So this is things like some shameless self promotion.

Yet on the title game on the players current score, this lawsuit was a little boundary of the top of the screen.

The next thing, of course, is to draw this snake, and this is quite easy with the also keyword, because the snake is a little list or we do is literate through the list, taking the coordinates of each body segment on drawing it accordingly.

Now, in this case, I'm using the be dead flag to draw either the skeleton, which is going to plus symbol or a segment of the snake body, which is going to be a capital in a very similar style.

I'm going to draw the snake's head on for this.

I just take the front elements off the linguist using front method here on the X and Y coordinates on in a similar way, I used to be dead variable to tell me, Should it be a capital exploring the snake is dead?

When the snake is alive, enjoying food couldn't be simpler.

We take food X and Y coordinates translate them, as we've done with all of these drawing methods, from a two dimensional corner system into a one dimensional for the screen.

But one was used, the percent sign to indicate food.

Let's take a quick look at this and see if it's working.

We've got the border, including the shameless self promotion on the score.

On We've got a snake with the head on an element of food.

Sometimes getting the presentation out of the way early is the correct thing to do, because we could make little changes to the game logic now and immediately see the results.

So I'm crazy, Boolean said, which will start Lefty and Mikey onto the previous state off the lefty on the right.

I'm storing the previous states because I only want to acknowledge the input on the change of the inputs are first of all, compared the old state versus the new state.

But I also only want to look at when the key is pressed.

So I need this temple information in order to make this decision, this could be considered a latching behavior.

The usual press the key, but it will only send one event.

We're not going to continuously send events per frame, wants the keys.

Help on this will stop the snake from coiling Open, hitting yourself immediately as soon as the player presses.

Like all of my other counsel applications, I like to make liberal use of the Get a sink key state key Word is this will retrieve the immediate state off the left and right arrow keys.

These are the codes for it on these other conditions I just talked about.

So only in the condition off the key has been pressed for the right key increments.

And for the lefty, we will deck Ament the snake direction I've added some little Klaus is here to make sure that the snake direction wrapped around so it's always between 0123 Like Tetris, I don't want the game to run a full throttle of the CPU.

Instead, I needed to slow down a little bit just to make it possible for the player to actually acknowledge what's going up.

Would you shoot straight off the screen rather crudely?

Now we've dealt with presentation and input.

Remember that my snake is just a leap list.

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編碼-自己動手!蛇!- 從零開始編程(快速簡單的C++) (Code-It-Yourself! Snake! - Programming from Scratch (Quick and Simple C++))

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