- 原文地址：Back to the 90s with C
- 原文作者：Ujjayanta Bhaumik
- 译文出自：掘金翻译计划
记得那些八九十年代的怀旧游戏！
来源：blog.archive.org/2019/10/13/…, www.lifewire.com/best-ms-dos…, boingboing.net/2021/08/27/…
有些人一定很怀念这些DOS游戏，怀念主机，怀念那时的一切，一切美好的旧时光。今天，我将向您介绍一个由Mattias Gustavsson所写的叹为观止的C库，它可以让你创建这些碉堡的复古风格游戏。
“dos-like 是一个编程库/框架，有点像一个微型游戏引擎，用于编写有90年代初的MS-DOS产品那味儿的游戏和程序。但是 dos-like 并非编写可在DOS主机上运行的代码，而是制作可在现代平台（如Window、Mac和Linux）上运行的程序，但它试图重铸旧DOS程序的外观、感觉和声音。”
如下是网站上的一些示例：
现在，让我们来探索该库。事实上，它非常容易安装。首先clone这个GitHub仓库：github.com/mattiasgust…
目录结构如下图所示：
编译器位于tcc目录内。
‘tcc.exe’ 是最关键的文件。(我仅介绍Windows安装) 您应该将其路径添加到path环境变量里。
这里的路径是仓库被克隆的位置。如果tcc路径设置正确，则可以进入命令提示符（Command Prompt），键入tcc，您应该可以看到如下内容：
这意味着库已正确安装
现在让我们看几个示例程序。作者已经在这里囊括了几个示例：github.com/mattiasgust…
基于曼德勃罗集（Mandelbrot Set）的例子，我为燃烧船分形（Burning Ship fractal）编写了程序：
// Burning Ship fractal inspired by Port of mandelbrot tutorial code by Lode Vandevenne
// https://lodev.org/cgtutor/juliamandelbrot.html#Mandelbrot_Set_#include <math.h>
#include <stdlib.h>
#include "dos.h"int main(int argc, char *argv[])
{
setvideomode( videomode_320x200 );
setdoublebuffer(1);
for( int i = 0; i < 32; ++i ) setpal( i, 0, 0, 31 - i );
int w = 320;
int h = 200;//each iteration, it calculates: newz = oldz*oldz + p, where p is the current pixel, and oldz stars at the origin
double pr, pi; //real and imaginary part of the pixel p
double newRe, newIm, oldRe, oldIm; //real and imaginary parts of new and old z
double zoom = 1, moveX = -0.5, moveY = 0; //you can change these to zoom and change position
int maxIterations = 255;//after how much iterations the function should stop
double zoomSpd = 0.005f;
for( ; ; ) {
//loop through every pixel
for(int y = 0; y < h; y++)
for(int x = 0; x < w; x++)
{
//calculate the initial real and imaginary part of z, based on the pixel location and zoom and position values
pr = 1.5 * (x - w / 2) / (0.5 * zoom * w) + moveX;
pi = (y - h / 2) / (0.5 * zoom * h) + moveY;
newRe = newIm = oldRe = oldIm = 0; //these should start at 0,0
//"i" will represent the number of iterations
int i;
//start the iteration process
for(i = 0; i < maxIterations; i++)
{
//remember value of previous iteration
if (newRe < 0)
{
oldRe = -newRe;
}
else{
oldRe = newRe;
}
if (newIm < 0)
{
oldIm = -newIm;
}
else{
oldIm = newIm;
}
//the actual iteration, the real and imaginary part are calculated
newRe = oldRe * oldRe - oldIm * oldIm + pr;
newIm = 2 * oldRe * oldIm + pi;
//if the point is outside the circle with radius 2: stop
if((newRe * newRe + newIm * newIm) > 4) break;
}
//draw the pixel
putpixel(x, y, ( i + 32 ) & 255 );
if( keystate( KEY_ESCAPE ) || shuttingdown() ) exit(0);
}
swapbuffers();
zoom += zoomSpd;
moveX -= 0.0050109f / zoom;
zoomSpd *= 1.005;
}return 0;
}
这会产生如下结果：
这是另一个绘制一些简单图形的示例程序。这里我们跟随鼠标指针并绘制圆圈。
#include <stdlib.h>
#include "dos.h"
#include <windows.h>
//author: Ujjayanta
int main(int argc, char **argv[]){
setvideomode(videomode_320x200);
int x, y;
POINT xypos;GetCursorPos(&xypos);
while(!shuttingdown())
{
GetCursorPos(&xypos);
for(int i =0 ; i<5;i++){
x = xypos.x;
y = xypos.y;
setcolor(rand()%256);
circle(x%320,y%200,4);
}
for(int i =0 ; i<5;i++){
x = xypos.x;
y = xypos.y;
setcolor(rand()%256);
circle(0,0,4);
}
if( keystate( KEY_ESCAPE ) ) break;
}
return 0;
}
