Game programming notes-start (3)-Snake Game implementation

Game programming notes-getting started

3. Snake Game implementation

Code download: http://download.csdn.net/detail/you_lan_hai/3738025

The core code implementation is as follows. For the algorithm description, see "Start (1 )":

# Include "app. H "# include <string. h> # include <stdlib. h> int g_map [100] [100]; // int g_nwidth = 610; // window width int g_nheight = 514; // window height int g_rows = 0; // map number of rows int g_cols = 0; // map number of columns int g_nsize = 30; // map square size struct point // two-dimensional point {int R; // line int C; // column}; point g_snake [1000]; // snake int g_nlength = 0; // snake length int g_nspeed; bool g_blive = true; // whether to survive int g_nsnakedir = 0; // the current direction of the snake. 0-left, 1-right, 2-up, 3-down const point g_direction [4] = {0,-1 }, {}}; // four Increment motion directions. Point g_prizepos; // prize subcoordinate bool g_bpause = true; // whether to suspend hbrush g_brushs [4]; // void setsnkedir (int dir) // set the direction of the snake. {If (DIR = 0 & g_nsnakedir = 1) | (DIR = 1 & g_nsnakedir = 0) | (DIR = 2 & g_nsnakedir = 3) | (DIR = 3 & g_nsnakedir = 2 )) // when the opposite direction is moved, it will suspend {g_bpause = true; return; // directly return and do nothing.} Else {g_bpause = false; g_nsnakedir = dir ;}} void resetlevel () // reset level {/* initialize the map. Initialize the four sides as obstacles, that is, they cannot pass. * 0-pass, 1-obstacle, 2-prize Child, 3-snake */memset (g_map, 0, sizeof (g_map); For (INT r = 0; r <g_rows; ++ R) {g_map [r] [0] = 1; g_map [r] [g_cols-1] = 1 ;}for (int c = 0; c <g_cols; ++ c) {g_map [0] [c] = 1; g_map [g_rows-1] [c] = 1;} g_nspeed = 500; g_bpause = true; // pause g_nsnakedir = 1; // to the right. G_blive = true; g_nlength = 3; // The Snake initially has three nodes g_snake [0]. R = 1; // snake header g_snake [0]. C = 3; g_snake [1]. R = 1; g_snake [1]. C = 2; g_snake [2]. R = 1; g_snake [2]. C = 1; // write the initial state to the map for (INT I = 0; I <g_nlength; ++ I) {g_map [g_snake [I]. r] [g_snake [I]. c] = 3;} // initialization prize child coordinate g_prizepos.r = 1; g_prizepos.c = g_cols-2;} void Init () // game initialization {g_brushs [0] = createsolidbrush (RGB (255,255,255); // white brush g_brushs [1] = createsolidbrush (RGB (255,); // paint obstacle paint brush g_brushs [2] = createsolidbrush (RGB (, 0 )); // draw prize image brush g_brushs [3] = createsolidbrush (RGB (0,255, 0); // draw snake image brush srand (gettickcount ()); // correction window height and width data rect RC; getclientrect (gethwnd (), & rc); g_nwidth = RC. right-RC. left; g_nheight = RC. bottom-RC. top; // calculate the row and column values g_rows = g_nheight/g_nsize; g_cols = g_nwidth/g_nsize; resetlevel ();} void Update () // logical update {// clock control static int oldtime = 0; Int curtime = gettickcount (); If (curtime-oldtime <g_nspeed) {return;} oldtime = curtime; //////////////////////////////////////// //// // static int lastocurtime = 0; // If (curtime-lastocurtime> 10000) of the time when the prize was last displayed // update the position every 10 s. {// Lastocurtime is not-1. If it is not eaten, the prize child from the original location is erased from the map. If (lastocurtime! =-1) {g_map [g_prizepos.r] [g_prizepos.c] = 0;} lastocurtime = curtime; // randomly generate prize subpositions. Bool flag = true; while (FLAG) {g_prizepos.r = rand () % (g_rows-2) + 1; g_prizepos.c = rand () % (g_cols-2) + 1; if (g_map [g_prizepos.r] [g_prizepos.c] = 0) // meets the condition {flag = false; g_map [g_prizepos.r] [g_prizepos.c] = 2 ;}} if (! G_blive | g_bpause) // death or pause {return;} // first, judge whether it is accessible, that is, whether it is killed. Point newhead; newhead. R = g_snake [0]. R + g_direction [g_nsnakedir]. r; newhead. C = g_snake [0]. c + g_direction [g_nsnakedir]. c; If (g_map [newhead. r] [newhead. c] = 1 | g_map [newhead. r] [newhead. c] = 3) {g_blive = false; If (idyes = MessageBox (gethwnd (), L "you are killed! Have you come back? ", L" Death prompt ", mb_yesno) {resetlevel () ;}else {postquitmessage (0) ;}return ;} else if (g_map [newhead. r] [newhead. c] = 2) // The winner {++ g_nlength; lastocurtime =-1; g_nspeed-= 10 ;} else {// undo the legacy g_map [g_snake [g_nLength-1] on the map. r] [g_snake [g_nLength-1]. c] = 0;} memmove (g_snake + 1, g_snake, sizeof (point) * (g_nLength-1); // move the snake's intermediate data g_snake [0]. R = newhead. r; g_snake [0]. C = newhead. c; // Add the snake header data g_map [G_s Nake [0]. r] [g_snake [0]. c] = 3; //////////////////////////////////////// /// //} void render () // screen rendering {HDC = getdc (gethwnd (); // obtain the HDC memdc of the system plotting device = createcompatibledc (0 ); // create an auxiliary drawing device hbitmap BMP back = createcompatiblebitmap (HDC, g_nwidth, g_nheight); // create a mask Bitmap (canvas) SelectObject (memdc, BMP back ); // paste the canvas to the drawing device Hpen penback = createpen (ps_solid, 1, RGB (255,); // create the paint brush SelectObject (Memdc, penback); // select the paint brush to the drawing device // erase the background rect rcclient; // getclientrect (gethwnd (), & rcclient ); // obtain the hbrush brushtemp = (hbrush) getstockobject (white_brush) in the customer region; // obtain the inventory object and the white image brush. Fillrect (memdc, & rcclient, brushtemp); // fill the customer region. //////////////////////////////////////// /// // Draw a 2-dimensional grid, rectangle painting. For (INT r = 0; r <g_rows; ++ R) {for (int c = 0; C <g_cols; ++ c) {SelectObject (memdc, g_brushs [g_map [r] [c]); rectangle (memdc, C * g_nsize, R * g_nsize, (C + 1) * g_nsize, (R + 1) * g_nsize );}} //////////////////////////////////////// /// // bitblt (HDC, 0, 0, g_nwidth, g_nheight, memdc, 0, 0, srccopy); // eobject (penback) is displayed on the system device; // release the paint brush resource deleteobject (BMP back ); // release the bitmap resource deletedc (memdc );// Release the secondary drawing device releasedc (gethwnd (), HDC); // return the system drawing device sleep (10);} void clear () // resource release {// release the image brush resource for (INT I = 0; I <4; ++ I) {If (g_brushs! = NULL) {deleteobject (g_brushs [I]); g_brushs [I] = NULL ;}}/* window process. If no message is processed, return 0; otherwise, return 1. */Lresult wndproc (hwnd, uint umsg, wparam, lparam) {Switch (umsg) {Case wm_keydown: {Switch (wparam) {Case vk_left: setsnkedir (0 ); break; // to the left case vk_right: setsnkedir (1); break; // to the right case vk_up: setsnkedir (2); break; // up case vk_down: setsnkedir (3 ); break; // downward case vk_escape: destroywindow (hwnd); break ;}} break; default: Return 0;} return 1 ;}// main function int winapi winmain (hi Nstance hinstance, hinstance, lpstr, INT) {If (! Initapp (hinstance, l "Snake Game", g_nwidth, g_nheight) {return 0 ;}// initialize game Init (); // game loop mainloop (); // release the resource clear (); Return 0 ;}