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Easyx图形库应用（和lua结合使用）

news 2025/10/20 8:09:30

lua本身是一门胶水语言。很多项目，在底层逻辑部分，都是用c/c++开发。但是业务代码部分，还是采用lua这种脚本语言来完成。这里面很大一部分原因，就是底层框架偏向于基础和原理、性能，而上层脚本偏向于应用。底层的部分改动不多，甚至来说没什么改动。但是业务不一样，可能这个项目是这么来写，那个项目是那么来处理。所以，就需要看怎么把底层结构和上层区分开来。不过今天我们说的lua和easyx，它是比较简单的。主要就是api级别的适配。

1、nuget安装

本身lua是可以自己安装第三方代码，编译生成静态库、动态库的。不过vs2017本身有nuget工具，可以通过它直接下载lua库。里面包含了头文件、静态库、动态库。

2、设置include目录

下载后的lua不能直接使用，需要手动设置下include目录，这一点稍微注意下。

3、api适配

这里的适配，主要是分成四种。一种是没有参数的api适配，这种是最简单的，

static void cleardevice_function(lua_State* L)
{::cleardevice();
}

第二种是有输入参数，但是没有返回值的适配，

static void initgraph_function(lua_State *L)
{int width = (int)luaL_checkinteger(L, 1);int height = (int)luaL_checkinteger(L, 2);::initgraph(width, height);
}

第三种，就是有返回值的适配，输入参数可以有，也可以没有。返回值1代表一个返回结果的意思。

static int kbhit_function(lua_State* L)
{lua_pushinteger(L, _kbhit());return 1; // 1 means 1 parameter
}

最后一种，就是需要创建对象的适配，这种适配一般需要返回一个指针，在实际场景中用的非常多。

static int getimage_function(lua_State* L)
{int x = (int)luaL_checkinteger(L, 1);int y = (int)luaL_checkinteger(L, 2);int width = (int)luaL_checkinteger(L, 3);int height = (int)luaL_checkinteger(L, 4);IMAGE* p_image = new IMAGE;::getimage(p_image, x, y, width, height);lua_pushinteger(L, (lua_Integer)(p_image));return 1; // 1 means 1 parameter
}

4、适配之后的lua开发

有了api的适配，那么就可以用lua进行程序开发。一般就是exe+lua开发即可。exe是可执行文件，开发之后就不用管了。而lua是程序文件，可以拿过来开发各种业务，比如下面这个简单的lua流程，


-- file:   demo.lua
-- author: feixiaoxing
-- email:  feixiaoxing@163.com
-- date:   2025-10-18initgraph(640, 480)
setfillcolor(0x0000AA)
solidcircle(320,240, 100)
image = getimage(220, 140, 200, 200)
saveimage("./demo.bmp", image)
rectangle(100, 100, 200, 50)
line(100, 400, 500, 400)direction = 0
offset = 0
value = 97 -- 'a'BeginBatchDraw()
while true doif 1 == _kbhit() thenvalue = _getch() -- update output contentendcleardevice()	if offset > 100 then -- no more than 50direction = 1endif offset < 0 then -- no less than 0direction  = 0endif direction == 0 then -- update offset hereoffset = offset + 1	elseoffset = offset - 1endputimage(220+offset, 140, image)rectangle(100+offset, 100, 200+offset, 50)line(100+offset, 400, 500+offset, 400)outtextxy(500+offset, 50, value-0x20)outtextxy(500+offset, 75, value-0x20+1)outtextxy(500+offset, 100, value-0x20+2)FlushBatchDraw()sleep(100)
endEndBatchDraw()
closegraph()

实际运行的效果就是这样的，

5、lua开发的一个好处

对于一个公司或者工作室来说，不可能所有人都精通编程。这种情况下，势必会有一部分人需要去做业务开发。如果是业务开发，其实可以用c#、java、lua来做是比较合适的。这里面，lua又是最合适的。不仅适配api非常合适，可以做很多定制开发，而且对使用者的学历没有要求，基本上所见即所得。哪怕是没有基础的同学，也可以短时间内快速上手，这是最大的优势。

lua修改后，快速看到效果，不需要任何编译动作，这就是lua的魅力所在。

6、多线程的处理

lua本身不支持多线程，不过我们可以通过多thread、多vm虚拟机的方法来解决。

7、完整的适配代码

本身api的适配还是不太难的。主要的处理方法，就是创建虚拟机、加载库、加载我们适配的函数，最后运行lua文件即可。这里给出完整的api适配文件，希望对大家有所帮助。一般来说，上层的api并不是很多，一般适配几十个api，就可以让开发业务的同学开始干活了。

// add by feixiaoxing, 2025.10.18#include <stdio.h>
#include <conio.h>
#include <graphics.h>#include "lua.hpp"static lua_State* L1 = NULL;// register init functionstatic void initgraph_function(lua_State *L)
{int width = (int)luaL_checkinteger(L, 1);int height = (int)luaL_checkinteger(L, 2);::initgraph(width, height);
}static int getch_function(lua_State* L)
{lua_pushinteger(L, _getch());return 1; // 1 means 1 parameter
}static int kbhit_function(lua_State* L)
{lua_pushinteger(L, _kbhit());return 1; // 1 means 1 parameter
}static void setfillcolor_function(lua_State* L)
{int value = (int)luaL_checkinteger(L, 1);::setfillcolor(value);
}static void putpixel_function(lua_State* L)
{int x = (int)luaL_checkinteger(L, 1);int y = (int)luaL_checkinteger(L, 2);int value = (int)luaL_checkinteger(L, 3);::putpixel(x, y, value);
}static void closegraph_function(lua_State* L)
{::closegraph();
}static void cleardevice_function(lua_State* L)
{::cleardevice();
}static void circle_function(lua_State* L)
{int x = (int)luaL_checkinteger(L, 1);int y = (int)luaL_checkinteger(L, 2);int radius = (int)luaL_checkinteger(L, 3);::circle(x, y, radius);
}static void fillcircle_function(lua_State* L)
{int x = (int)luaL_checkinteger(L, 1);int y = (int)luaL_checkinteger(L, 2);int radius = (int)luaL_checkinteger(L, 3);::fillcircle(x, y, radius);
}static void solidcircle_function(lua_State* L)
{int x = (int)luaL_checkinteger(L, 1);int y = (int)luaL_checkinteger(L, 2);int radius = (int)luaL_checkinteger(L, 3);::solidcircle(x, y, radius);
}static void line_function(lua_State* L)
{int x1 = (int)luaL_checkinteger(L, 1);int y1 = (int)luaL_checkinteger(L, 2);int x2 = (int)luaL_checkinteger(L, 3);int y2 = (int)luaL_checkinteger(L, 4);::line(x1, y1, x2, y2);
}static void rectangle_function(lua_State* L)
{int x1 = (int)luaL_checkinteger(L, 1);int y1 = (int)luaL_checkinteger(L, 2);int x2 = (int)luaL_checkinteger(L, 3);int y2 = (int)luaL_checkinteger(L, 4);::rectangle(x1, y1, x2, y2);
}static void fillrectangle_function(lua_State* L)
{int x1 = (int)luaL_checkinteger(L, 1);int y1 = (int)luaL_checkinteger(L, 2);int x2 = (int)luaL_checkinteger(L, 3);int y2 = (int)luaL_checkinteger(L, 4);::fillrectangle(x1, y1, x2, y2);
}static void solidrectangle_function(lua_State* L)
{int x1 = (int)luaL_checkinteger(L, 1);int y1 = (int)luaL_checkinteger(L, 2);int x2 = (int)luaL_checkinteger(L, 3);int y2 = (int)luaL_checkinteger(L, 4);::solidrectangle(x1, y1, x2, y2);
}static void sleep_function(lua_State* L)
{int value = (int)luaL_checkinteger(L, 1);::Sleep(value);
}static void outextxy_function(lua_State* L)
{int x = (int)luaL_checkinteger(L, 1);int y = (int)luaL_checkinteger(L, 2);int value = (int)luaL_checkinteger(L, 3);::outtextxy(x, y, value);
}static int inputbox_function(lua_State* L)
{char s[10] = {0};int speed = 0;InputBox((LPTSTR)s, 10, "Input speed:");speed = atoi(s);lua_pushinteger(L, (lua_Integer)(speed));return 1;
}static int getimage_function(lua_State* L)
{int x = (int)luaL_checkinteger(L, 1);int y = (int)luaL_checkinteger(L, 2);int width = (int)luaL_checkinteger(L, 3);int height = (int)luaL_checkinteger(L, 4);IMAGE* p_image = new IMAGE;::getimage(p_image, x, y, width, height);lua_pushinteger(L, (lua_Integer)(p_image));return 1; // 1 means 1 parameter
}static void putimage_function(lua_State* L)
{int x = (int)luaL_checkinteger(L, 1);int y = (int)luaL_checkinteger(L, 2);IMAGE* p_image = (IMAGE*)luaL_checkinteger(L, 3);::putimage(x, y, p_image);
}static void saveimage_function(lua_State* L)
{const char *path = lua_tostring(L, 1);IMAGE* image = (IMAGE*)luaL_checkinteger(L, 2);::saveimage((LPCTSTR)path, image); // need using multi-bytes encode format
}static void rotateimage_function(lua_State* L)
{IMAGE* dst_image = (IMAGE*)luaL_checkinteger(L, 1);IMAGE* src_image = (IMAGE*)luaL_checkinteger(L, 2);int angle = (int)luaL_checkinteger(L, 3);::rotateimage(dst_image, src_image, angle/360.0 * 6.28);
}static void BeginBatchDraw_function(lua_State* L)
{::BeginBatchDraw();
}static void FlushBatchDraw_function(lua_State* L)
{::FlushBatchDraw();
}static void EndBatchDraw_function(lua_State* L)
{::EndBatchDraw();
}// c read data from luastatic int read_lua_value(lua_State* L)
{if(NULL == L){return -1;}lua_getglobal(L, "max_players"); // this step is very important, 2025.10.19return (int)luaL_checkinteger(L, -1);
}// launch script and execute script herestatic void* launch_script(void* p_file)
{int status = 0;// create a virtual machineL1 = luaL_newstate();if (NULL == L1){goto exit;}// register open function hereluaL_openlibs(L1);// basic operationlua_register(L1,  "initgraph",       (lua_CFunction)&initgraph_function);lua_register(L1,  "_getch",          (lua_CFunction)&getch_function);lua_register(L1,  "_kbhit",          (lua_CFunction)&kbhit_function);lua_register(L1,  "setfillcolor",    (lua_CFunction)&setfillcolor_function);lua_register(L1,  "putpixel",        (lua_CFunction)&putpixel_function);lua_register(L1,  "circle",          (lua_CFunction)&circle_function);lua_register(L1,  "fillcircle",      (lua_CFunction)&fillcircle_function);lua_register(L1,  "solidcircle",     (lua_CFunction)&solidcircle_function);lua_register(L1,  "line",            (lua_CFunction)&line_function);lua_register(L1,  "rectangle",       (lua_CFunction)&rectangle_function);lua_register(L1,  "fillrectangle",   (lua_CFunction)&fillrectangle_function);lua_register(L1,  "solidrectangle",  (lua_CFunction)&solidrectangle_function);lua_register(L1,  "closegraph",      (lua_CFunction)&closegraph_function);lua_register(L1,  "cleardevice",     (lua_CFunction)&cleardevice_function);lua_register(L1,  "sleep",           (lua_CFunction)&sleep_function);lua_register(L1,  "outtextxy",       (lua_CFunction)&outextxy_function);lua_register(L1,  "inputbox",        (lua_CFunction)&inputbox_function);// about image operationlua_register(L1,  "getimage",        (lua_CFunction)&getimage_function);lua_register(L1,  "putimage",        (lua_CFunction)&putimage_function);lua_register(L1,  "saveimage",       (lua_CFunction)&saveimage_function); //need multi-bytes setting in vs2017lua_register(L1,  "rotateimage",     (lua_CFunction)&rotateimage_function);// about buffer accelerationlua_register(L1,  "BeginBatchDraw",  (lua_CFunction)&BeginBatchDraw_function);lua_register(L1,  "FlushBatchDraw",  (lua_CFunction)&FlushBatchDraw_function);lua_register(L1,  "EndBatchDraw",    (lua_CFunction)&EndBatchDraw_function);// c call lua, if lua needs invoke c, just using lua_pcall & lua_getglobalstatus = luaL_dofile(L1, (const char*)p_file); // open and execute fileif (status != LUA_OK){printf("failed to open lua file\n");lua_close(L1);goto exit;}// close virtual machinelua_close(L1);exit:return NULL;
}int main(int argc, char* argv[])
{launch_script((void*)"./demo.lua");return 0;
}

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