Fixed errors and documented everything
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<!DOCTYPE html>
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<html>
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<head>
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<title>cnibbles.c</title>
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<a class="large" href="javascript:void(0);">Jump To …</a>
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<a class="source" href="cnibbles.html">
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cnibbles.c
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</a>
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<a class="source" href="nibbles.html">
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nibbles.S
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</a>
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<a class="source" href="start.html">
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start.S
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<ul class="sections">
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<li id="title">
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<div class="annotation">
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<h1>cnibbles.c</h1>
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</div>
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</li>
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<li id="section-1">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-1">¶</a>
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</div>
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<div class="content"><div class='highlight'><pre><span class="hljs-preprocessor">#<span class="hljs-keyword">include</span> <stdio.h></span>
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<span class="hljs-preprocessor">#<span class="hljs-keyword">include</span> <stdbool.h></span>
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<span class="hljs-preprocessor">#<span class="hljs-keyword">include</span> "helpers.c"</span>
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<span class="hljs-preprocessor">#<span class="hljs-keyword">define</span> WIDTH 60</span>
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<span class="hljs-preprocessor">#<span class="hljs-keyword">define</span> HEIGHT 40</span>
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<span class="hljs-preprocessor">#<span class="hljs-keyword">define</span> DEBUG false</span>
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<span class="hljs-keyword">unsigned</span> <span class="hljs-keyword">int</span> startLength = <span class="hljs-number">0</span>;
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<span class="hljs-keyword">unsigned</span> <span class="hljs-keyword">int</span> startApples = <span class="hljs-number">0</span>;
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<span class="hljs-keyword">unsigned</span> <span class="hljs-keyword">int</span> currentTick;
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<span class="hljs-keyword">int</span> snake[WIDTH*HEIGHT];
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<span class="hljs-keyword">unsigned</span> <span class="hljs-keyword">int</span> snakeLength;
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<span class="hljs-keyword">unsigned</span> <span class="hljs-keyword">int</span> snakeX;
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<span class="hljs-keyword">unsigned</span> <span class="hljs-keyword">int</span> snakeY;
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<span class="hljs-keyword">int</span> snakeDirX;
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<span class="hljs-keyword">int</span> snakeDirY;
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<span class="hljs-keyword">unsigned</span> <span class="hljs-keyword">int</span> numApples;
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<span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">spawnApple</span><span class="hljs-params">()</span></span>;
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<span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">tick</span><span class="hljs-params">()</span></span>;
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<span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">draw</span><span class="hljs-params">()</span></span>;</pre></div></div>
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<a class="pilcrow" href="#section-2">¶</a>
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</div>
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<h1 id="start_game">start_game</h1>
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</div>
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<div class="annotation">
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<div class="content"><div class='highlight'><pre><span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">start_game</span><span class="hljs-params">(<span class="hljs-keyword">int</span> len, <span class="hljs-keyword">int</span> n_apples)</span>
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</span>{
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<span class="hljs-keyword">if</span> (startLength == <span class="hljs-number">0</span>)
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startLength = len;
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<span class="hljs-keyword">if</span> (startApples == <span class="hljs-number">0</span>)
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startApples = n_apples;</pre></div></div>
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</li>
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<li id="section-4">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-4">¶</a>
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</div>
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<p>Initialize variables</p>
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</div>
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<div class="content"><div class='highlight'><pre> currentTick = <span class="hljs-number">0</span>;
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snakeLength = len;
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numApples = n_apples;
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nib_init();</pre></div></div>
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<li id="section-5">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-5">¶</a>
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</div>
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<p>Initialize the snake array
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Set every cell to a time value greater than the snake length</p>
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</div>
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<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">for</span> (<span class="hljs-keyword">unsigned</span> <span class="hljs-keyword">int</span> i = <span class="hljs-number">0</span>; i < WIDTH*HEIGHT; ++i) {
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snake[i] = snakeLength;
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}</pre></div></div>
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<li id="section-6">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-6">¶</a>
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</div>
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<p>Place the snake head in the middle</p>
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</div>
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<div class="content"><div class='highlight'><pre> snakeX = WIDTH / <span class="hljs-number">2</span>;
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snakeY = HEIGHT / <span class="hljs-number">2</span>;
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snakeDirX = <span class="hljs-number">0</span>;
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snakeDirY = -<span class="hljs-number">1</span>;</pre></div></div>
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</li>
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<li id="section-7">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-7">¶</a>
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</div>
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<p>Place the initial snake segments, downwards or something</p>
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</div>
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<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">for</span> (<span class="hljs-keyword">unsigned</span> <span class="hljs-keyword">int</span> i = <span class="hljs-number">0</span>; i < snakeLength; ++i) {
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<span class="hljs-keyword">unsigned</span> <span class="hljs-keyword">int</span> x = snakeX % WIDTH;
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<span class="hljs-keyword">unsigned</span> <span class="hljs-keyword">int</span> y = (snakeY + i) % HEIGHT;
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snake[x + y*WIDTH] = i;
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}</pre></div></div>
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</li>
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<li id="section-8">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-8">¶</a>
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</div>
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<p>Place apples</p>
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</div>
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<div class="content"><div class='highlight'><pre> srand(time(<span class="hljs-number">0</span>));
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<span class="hljs-keyword">for</span> (<span class="hljs-keyword">unsigned</span> <span class="hljs-keyword">int</span> i = <span class="hljs-number">0</span>; i < numApples; ++i) {
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spawnApple();
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}
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<span class="hljs-keyword">while</span> (<span class="hljs-keyword">true</span>) {
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tick();
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draw();
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}
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}</pre></div></div>
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</li>
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<li id="section-9">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-9">¶</a>
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</div>
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<h1 id="spawnapple">spawnApple</h1>
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</div>
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</li>
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<li id="section-10">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-10">¶</a>
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</div>
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<div class="content"><div class='highlight'><pre><span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">spawnApple</span><span class="hljs-params">()</span>
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</span>{
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<span class="hljs-keyword">unsigned</span> <span class="hljs-keyword">int</span> x = rand() % WIDTH;
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<span class="hljs-keyword">unsigned</span> <span class="hljs-keyword">int</span> y = rand() % HEIGHT;
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<span class="hljs-keyword">while</span> (snake[x + y*WIDTH] < snakeLength) {
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x = rand() % WIDTH;
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y = rand() % HEIGHT;
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}
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snake[x + y*WIDTH] = -<span class="hljs-number">1</span>;
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}</pre></div></div>
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<li id="section-11">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-11">¶</a>
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</div>
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<h1 id="tick">tick</h1>
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</div>
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</li>
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<li id="section-12">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-12">¶</a>
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</div>
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</div>
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<div class="content"><div class='highlight'><pre><span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">tick</span><span class="hljs-params">()</span>
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</span>{
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currentTick++;</pre></div></div>
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</li>
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<li id="section-13">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-13">¶</a>
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</div>
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<h2 id="increment-cell-times">Increment cell times</h2>
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</div>
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<li id="section-14">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-14">¶</a>
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</div>
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<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">for</span> (<span class="hljs-keyword">unsigned</span> <span class="hljs-keyword">int</span> i = <span class="hljs-number">0</span>; i < WIDTH*HEIGHT; ++i) {
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<span class="hljs-keyword">int</span> val = snake[i];
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<span class="hljs-keyword">if</span> (val < <span class="hljs-number">0</span>) {</pre></div></div>
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</li>
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<li id="section-15">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-15">¶</a>
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</div>
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<p>Apple lifetime</p>
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</div>
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<div class="content"><div class='highlight'><pre> <span class="hljs-comment">/* snake[i]--; */</span>
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} <span class="hljs-function"><span class="hljs-keyword">else</span> <span class="hljs-title">if</span> <span class="hljs-params">(val >= 0 && val <= snakeLength)</span> </span>{</pre></div></div>
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</li>
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<li id="section-16">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-16">¶</a>
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</div>
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<p>Other cells</p>
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</div>
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<div class="content"><div class='highlight'><pre> snake[i]++;
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}
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}</pre></div></div>
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</li>
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<li id="section-17">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-17">¶</a>
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</div>
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<h2 id="input">Input</h2>
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</div>
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</li>
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<li id="section-18">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-18">¶</a>
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</div>
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</div>
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<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">int</span> key = nib_poll_kbd();
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<span class="hljs-keyword">if</span> (key == <span class="hljs-string">'w'</span> && snakeDirY != <span class="hljs-number">1</span>) {
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snakeDirX = <span class="hljs-number">0</span>;
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snakeDirY = -<span class="hljs-number">1</span>;
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}
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<span class="hljs-keyword">if</span> (key == <span class="hljs-string">'s'</span> && snakeDirY != -<span class="hljs-number">1</span>) {
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snakeDirX = <span class="hljs-number">0</span>;
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snakeDirY = <span class="hljs-number">1</span>;
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}
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<span class="hljs-keyword">if</span> (key == <span class="hljs-string">'a'</span> && snakeDirX != <span class="hljs-number">1</span>) {
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snakeDirX = -<span class="hljs-number">1</span>;
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snakeDirY = <span class="hljs-number">0</span>;
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}
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<span class="hljs-keyword">if</span> (key == <span class="hljs-string">'d'</span> && snakeDirX != -<span class="hljs-number">1</span>) {
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snakeDirX = <span class="hljs-number">1</span>;
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snakeDirY = <span class="hljs-number">0</span>;
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}</pre></div></div>
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</li>
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<li id="section-19">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-19">¶</a>
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</div>
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<h2 id="move-snake">Move snake</h2>
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</div>
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</li>
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-20">¶</a>
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</div>
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</div>
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<div class="content"><div class='highlight'><pre> snakeX = (snakeX + snakeDirX + WIDTH) % WIDTH;
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snakeY = (snakeY + snakeDirY + HEIGHT) % HEIGHT;</pre></div></div>
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</li>
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-21">¶</a>
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</div>
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<h2 id="collision">Collision</h2>
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</div>
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</li>
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-22">¶</a>
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</div>
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<p>On collision with self</p>
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</div>
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<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">int</span> val = snake[snakeX + snakeY*WIDTH];
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<span class="hljs-keyword">if</span> (val < snakeLength && val >= <span class="hljs-number">0</span>) {</pre></div></div>
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</li>
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<li id="section-23">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-23">¶</a>
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</div>
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<p>nib_end();</p>
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</div>
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<div class="content"><div class='highlight'><pre> start_game(startLength, startApples);
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||||
}</pre></div></div>
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</li>
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<li id="section-24">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-24">¶</a>
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</div>
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<p>ON collision with apple</p>
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</div>
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<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">if</span> (val < <span class="hljs-number">0</span>) {</pre></div></div>
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</li>
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<li id="section-25">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-25">¶</a>
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</div>
|
||||
<p>Spawn a new apple somewhere</p>
|
||||
|
||||
</div>
|
||||
|
||||
<div class="content"><div class='highlight'><pre> spawnApple();</pre></div></div>
|
||||
|
||||
</li>
|
||||
|
||||
|
||||
<li id="section-26">
|
||||
<div class="annotation">
|
||||
|
||||
<div class="pilwrap ">
|
||||
<a class="pilcrow" href="#section-26">¶</a>
|
||||
</div>
|
||||
<p>Increase our length!</p>
|
||||
|
||||
</div>
|
||||
|
||||
<div class="content"><div class='highlight'><pre> snakeLength++;
|
||||
}</pre></div></div>
|
||||
|
||||
</li>
|
||||
|
||||
|
||||
<li id="section-27">
|
||||
<div class="annotation">
|
||||
|
||||
<div class="pilwrap ">
|
||||
<a class="pilcrow" href="#section-27">¶</a>
|
||||
</div>
|
||||
<h2 id="update-world">Update world</h2>
|
||||
|
||||
</div>
|
||||
|
||||
</li>
|
||||
|
||||
|
||||
<li id="section-28">
|
||||
<div class="annotation">
|
||||
|
||||
<div class="pilwrap ">
|
||||
<a class="pilcrow" href="#section-28">¶</a>
|
||||
</div>
|
||||
|
||||
</div>
|
||||
|
||||
<div class="content"><div class='highlight'><pre> snake[snakeX + snakeY*WIDTH] = <span class="hljs-number">0</span>;
|
||||
}</pre></div></div>
|
||||
|
||||
</li>
|
||||
|
||||
|
||||
<li id="section-29">
|
||||
<div class="annotation">
|
||||
|
||||
<div class="pilwrap ">
|
||||
<a class="pilcrow" href="#section-29">¶</a>
|
||||
</div>
|
||||
<h1 id="draw">draw</h1>
|
||||
|
||||
</div>
|
||||
|
||||
</li>
|
||||
|
||||
|
||||
<li id="section-30">
|
||||
<div class="annotation">
|
||||
|
||||
<div class="pilwrap ">
|
||||
<a class="pilcrow" href="#section-30">¶</a>
|
||||
</div>
|
||||
|
||||
</div>
|
||||
|
||||
<div class="content"><div class='highlight'><pre><span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">draw</span><span class="hljs-params">()</span>
|
||||
</span>{
|
||||
<span class="hljs-keyword">char</span> body[] = <span class="hljs-string">"NIBBLES"</span>;
|
||||
|
||||
<span class="hljs-keyword">for</span> (<span class="hljs-keyword">int</span> y = -<span class="hljs-number">1</span>; y <= HEIGHT; ++y) {
|
||||
<span class="hljs-keyword">for</span> (<span class="hljs-keyword">int</span> x = -<span class="hljs-number">1</span>; x <= WIDTH; ++x) {</pre></div></div>
|
||||
|
||||
</li>
|
||||
|
||||
|
||||
<li id="section-31">
|
||||
<div class="annotation">
|
||||
|
||||
<div class="pilwrap ">
|
||||
<a class="pilcrow" href="#section-31">¶</a>
|
||||
</div>
|
||||
<p>Draw a border outside the playing field</p>
|
||||
|
||||
</div>
|
||||
|
||||
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">if</span> (x == -<span class="hljs-number">1</span> || y == -<span class="hljs-number">1</span> || x == WIDTH || y == HEIGHT) {
|
||||
<span class="hljs-keyword">unsigned</span> <span class="hljs-keyword">int</span> screenX = x + <span class="hljs-number">1</span>;
|
||||
<span class="hljs-keyword">unsigned</span> <span class="hljs-keyword">int</span> screenY = y + <span class="hljs-number">1</span>;
|
||||
nib_put_scr(screenX, screenY, <span class="hljs-string">'#'</span>);
|
||||
} <span class="hljs-keyword">else</span> {
|
||||
<span class="hljs-keyword">int</span> snakeVal = snake[x + y*WIDTH];
|
||||
<span class="hljs-keyword">unsigned</span> <span class="hljs-keyword">int</span> screenX = x + <span class="hljs-number">1</span>;
|
||||
<span class="hljs-keyword">unsigned</span> <span class="hljs-keyword">int</span> screenY = y + <span class="hljs-number">1</span>;</pre></div></div>
|
||||
|
||||
</li>
|
||||
|
||||
|
||||
<li id="section-32">
|
||||
<div class="annotation">
|
||||
|
||||
<div class="pilwrap ">
|
||||
<a class="pilcrow" href="#section-32">¶</a>
|
||||
</div>
|
||||
<p>If the <code>DEBUG</code> flag is set, draw the raw ASCII-value for debugging purposes</p>
|
||||
|
||||
</div>
|
||||
|
||||
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">if</span> (DEBUG) {
|
||||
nib_put_scr(screenX, screenY, <span class="hljs-string">'0'</span> + snakeVal);
|
||||
<span class="hljs-keyword">continue</span>;
|
||||
}</pre></div></div>
|
||||
|
||||
</li>
|
||||
|
||||
|
||||
<li id="section-33">
|
||||
<div class="annotation">
|
||||
|
||||
<div class="pilwrap ">
|
||||
<a class="pilcrow" href="#section-33">¶</a>
|
||||
</div>
|
||||
<p>If the value is greater than <code>0</code> and less than <code>snakeLength</code>, it’s part of the snake</p>
|
||||
|
||||
</div>
|
||||
|
||||
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">if</span> (snakeVal >= <span class="hljs-number">0</span> && snakeVal < snakeLength) {
|
||||
<span class="hljs-keyword">if</span> (x == snakeX && y == snakeY) {</pre></div></div>
|
||||
|
||||
</li>
|
||||
|
||||
|
||||
<li id="section-34">
|
||||
<div class="annotation">
|
||||
|
||||
<div class="pilwrap ">
|
||||
<a class="pilcrow" href="#section-34">¶</a>
|
||||
</div>
|
||||
<p>Draw the head</p>
|
||||
|
||||
</div>
|
||||
|
||||
<div class="content"><div class='highlight'><pre> nib_put_scr(screenX, screenY, <span class="hljs-string">'@'</span>);
|
||||
} <span class="hljs-keyword">else</span> {</pre></div></div>
|
||||
|
||||
</li>
|
||||
|
||||
|
||||
<li id="section-35">
|
||||
<div class="annotation">
|
||||
|
||||
<div class="pilwrap ">
|
||||
<a class="pilcrow" href="#section-35">¶</a>
|
||||
</div>
|
||||
<p>Draw the body</p>
|
||||
|
||||
</div>
|
||||
|
||||
<div class="content"><div class='highlight'><pre> nib_put_scr(screenX, screenY, body[(snakeVal - <span class="hljs-number">1</span>) % <span class="hljs-number">7</span>]);
|
||||
}
|
||||
} <span class="hljs-function"><span class="hljs-keyword">else</span> <span class="hljs-title">if</span> <span class="hljs-params">(snakeVal < 0)</span> </span>{</pre></div></div>
|
||||
|
||||
</li>
|
||||
|
||||
|
||||
<li id="section-36">
|
||||
<div class="annotation">
|
||||
|
||||
<div class="pilwrap ">
|
||||
<a class="pilcrow" href="#section-36">¶</a>
|
||||
</div>
|
||||
<p>If the value is less than <code>0</code>, it’s an apple</p>
|
||||
|
||||
</div>
|
||||
|
||||
<div class="content"><div class='highlight'><pre> nib_put_scr(screenX, screenY, <span class="hljs-string">'o'</span>);
|
||||
} <span class="hljs-keyword">else</span> {</pre></div></div>
|
||||
|
||||
</li>
|
||||
|
||||
|
||||
<li id="section-37">
|
||||
<div class="annotation">
|
||||
|
||||
<div class="pilwrap ">
|
||||
<a class="pilcrow" href="#section-37">¶</a>
|
||||
</div>
|
||||
<p>Otherwise it’s empty.</p>
|
||||
|
||||
</div>
|
||||
|
||||
<div class="content"><div class='highlight'><pre> nib_put_scr(screenX, screenY, <span class="hljs-string">' '</span>);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}</pre></div></div>
|
||||
|
||||
</li>
|
||||
|
||||
</ul>
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
||||
Reference in New Issue
Block a user