snake.c

简单的gtk+环境下的贪吃蛇游戏源码,供学习gtk+入门

/*
	snake - snake.c
 	Copyright (c) 2003 by Linux_Lyb <[e-mail]>
 ____________________________________________________________________________	
	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2, or (at your option)
	any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the Free Software
	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

	See the file COPYING in the doc/ directory for more information.
*/

#include <gdk/gdkkeysyms.h>
#include <time.h>
#include <stdlib.h>
#include "snake.h"
 
static GtkWidget *window = NULL;
static GtkWidget *draw_area = NULL;
static GdkPixmap *pixmap = NULL;
GtkWidget *label;
gchar text[64];
guint timer = 0;
gboolean playing = FALSE;
gboolean pauseing = FALSE;
She she;
Dan dan;
//游戏相关变量
guint speed = 200;
guint level = 1;
guint dans = 35;
guint live = 3;

gboolean play_game (gpointer data);

gint my_rand (gint min,gint max)
{
	return rand() % max + min;
}

//进行蛇身体（不包括头部）的走动
void she_zuo ()
{
gint i;
	for (i=she.changdu;i>0;i--) {
		she.shengti[i].x = she.shengti[i-1].x;
		she.shengti[i].y = she.shengti[i-1].y;	
	}

}

//设置标签的内容
void set_label()
{
	sprintf (text,"egg: %d | live: %d | level: %d",dans,live,level);
	gtk_label_set_text (GTK_LABEL(label),text);
}

//画游戏画面
void draw()
{
gint i;
//clear all
	gdk_draw_rectangle (pixmap,window->style->white_gc,TRUE,0, 0,
		      draw_area->allocation.width,draw_area->allocation.height);

//draw snake
	for (i=0;i<=she.changdu;i++) {
		//g_print ("[%d]%d,%d->",i,she.shengti[i].x,she.shengti[i].y);
		gdk_draw_rectangle (pixmap,window->style->black_gc,TRUE,she.shengti[i].x * 10,she.shengti[i].y * 10,
		      			10,10);
	}
	

//draw egg
	gdk_draw_rectangle (pixmap,window->style->black_gc,TRUE,dan.x * 10,dan.y * 10,
		      		10,10);

	gtk_widget_queue_draw (draw_area);	
}

//初始化游戏
void init_game()
{
gint i;
	//蛇的设定
	she.changdu = 5;
	she.shengti[0].x = my_rand (5,20);
	she.shengti[0].y = my_rand (5,20);
	she.fangxiang = my_rand (0,4);
	she.live = TRUE;

	for (i=1;i<=she.changdu;i++)
		switch (she.fangxiang) {
			case SHE_SHANG:
				she.shengti[i].x = she.shengti[i-1].x;
				she.shengti[i].y = she.shengti[i-1].y - 1;
			break;
			case SHE_XIA:
				she.shengti[i].x = she.shengti[i-1].x;
				she.shengti[i].y = she.shengti[i-1].y + 1;;
			break;
			case SHE_ZUO:
				she.shengti[i].x = she.shengti[i-1].x - 1;
				she.shengti[i].y = she.shengti[i-1].y;
			break;
			case SHE_YOU:
				she.shengti[i].x = she.shengti[i-1].x + 1;
				she.shengti[i].y = she.shengti[i-1].y;
			break;
			default:
			break;	
		}
	she.live = TRUE;
	//蛋的设定
	dan.x = my_rand (0,20);
	dan.y = dan.x;
	dan.live = TRUE;
}

//游戏开始
void game_start()
{
	if (timer == 0) timer = g_timeout_add (speed,play_game,NULL);
}

//暂停游戏
void game_pause(GtkWidget *widget)
{
	if (pauseing == FALSE) {
		if (timer != 0) g_source_remove (timer);
      		timer = 0;
		gtk_button_set_label (GTK_BUTTON(widget)," Go "); 
		pauseing = TRUE;
	} else {
		if (timer == 0) timer = g_timeout_add (speed,play_game,NULL);
		gtk_button_set_label (GTK_BUTTON(widget),"Pause");
		pauseing = FALSE; 
	}
}

//停止游戏
void game_stop()
{
	playing = FALSE;
	if (timer != 0) g_source_remove (timer);
      	timer = 0;		
}

gboolean play_game (gpointer data)
{
int i;
	if (playing == FALSE) { //如果游戏还没开始，初始化游戏并开始
		init_game();
		set_label();
		playing = TRUE;
		return TRUE;
		}

	she_zuo();
	
	switch (she.fangxiang) {
		case SHE_SHANG:
			she.shengti[0].y = she.shengti[0].y - 1;
			//判断是否有向自己身体走的情况，如果有就改变方向
			//头部[0]和身体[2]的坐标(x或y)相同，就需要向反方向改变
			if (she.shengti[0].y == she.shengti[2].y) {
				she.fangxiang = SHE_XIA;
				she.shengti[0].y = she.shengti[0].y + 2;
			}
			break;
		case SHE_XIA:
			she.shengti[0].y = she.shengti[0].y + 1;
			if (she.shengti[0].y == she.shengti[2].y) {
				she.fangxiang = SHE_SHANG;
				she.shengti[0].y = she.shengti[0].y - 2;
			}

			break;
		case SHE_ZUO:
			she.shengti[0].x = she.shengti[0].x - 1;
			if (she.shengti[0].x == she.shengti[2].x) {
				she.fangxiang = SHE_YOU;
				she.shengti[0].x = she.shengti[0].x + 2;
			}
			break;
		case SHE_YOU:
			she.shengti[0].x = she.shengti[0].x + 1;
			if (she.shengti[0].x == she.shengti[2].x) {
				she.fangxiang = SHE_ZUO;
				she.shengti[0].x = she.shengti[0].x - 2;
			}
			break;
		default:
			break;
	}
	//判断蛇的头部是否碰到了自己的身体，如果碰到了就去死！
	for (i=4;i<=she.changdu;i++)
		if (she.shengti[0].x == she.shengti[i].x && she.shengti[0].y == she.shengti[i].y) 
			she.live = FALSE;

	//判断蛇是否碰到边界，如果碰到了就去死！
	if (she.shengti[0].x < 0 || she.shengti[0].y < 0 || she.shengti[0].x > 40 || she.shengti[0].y > 40) {she.live = FALSE;}
	
	//判断蛇是否死了
	if (she.live == FALSE) {
		live = live - 1;
		if (live == 0) { //没命就GAME OVER
			speed = 200;
			level = 1;
			dans = 20;
			live = 3;
			game_stop();
			gtk_label_set_text(GTK_LABEL(label)," - Game Over -");
			return FALSE;
		}
		//还有命就继续
		set_label();	
		init_game();
	}
		

	//判断蛇是否吃到了蛋，如果吃到了就变长！
	if (she.shengti[0].x == dan.x && she.shengti[0].y == dan.y) {
		she.changdu = she.changdu + 1;
		she.shengti[she.changdu].x = she.shengti[she.changdu-1].x;
		she.shengti[she.changdu].y = she.shengti[she.changdu-1].y;
		//重新生成一个蛋
		dan.x = my_rand (0,20);
		dan.y = dan.x;
		dans = dans - 1; //减少一个蛋
		if (dans == 0) { //如果吃完全部的蛋，进入下一局，速度加快
			level = level + 1;
			dans = 20;
			if (speed > 30) speed = speed - 20;
			game_stop();
			game_start();
		}
		set_label();
	}

	draw();
	return TRUE;
}

static gboolean configure_event (GtkWidget *widget,GdkEventConfigure *event,gpointer data)
{
	if (pixmap)
		g_object_unref (pixmap);
 	pixmap = gdk_pixmap_new (widget->window,
			widget->allocation.width,widget->allocation.height,-1);

	gdk_draw_rectangle (pixmap,widget->style->white_gc,TRUE,0, 0,
		      widget->allocation.width,widget->allocation.height);
  return TRUE;
}

static gboolean expose_event(GtkWidget *widget,GdkEventExpose *event,gpointer data)
{
gdk_draw_drawable (widget->window,
		     widget->style->fg_gc[GTK_WIDGET_STATE (widget)],
		     pixmap,
		     event->area.x, event->area.y,
		     event->area.x, event->area.y,
		     event->area.width, event->area.height);
  return TRUE;
}

//处理按钮事件
void key_press (GtkWidget *widget,GdkEventKey *event)
{
	if (playing == TRUE && event->type == GDK_KEY_PRESS) {
		
		switch (event->keyval) {
			case GDK_Up:
				she.fangxiang = SHE_SHANG;
			break;
			case GDK_Down:
				she.fangxiang = SHE_XIA;
			break;
			case GDK_Left:
				she.fangxiang = SHE_ZUO;
			break;
			case GDK_Right:
				she.fangxiang = SHE_YOU;
			break;
			default:
			break;
		}

	}
}

//退出游戏
void quit_game()
{
	game_stop();
	gtk_main_quit();
	g_object_unref (pixmap);
}

void create_window()
{
GtkWidget *vbox,*hbox;
GtkWidget *b_start,*b_pause;

	window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
	gtk_window_set_title (GTK_WINDOW(window),"TanChiShe Ver 0.3");
	//gtk_window_set_resizable (GTK_WINDOW(window),FALSE);
	gtk_widget_set_usize (window,408,448);
	gtk_window_set_position (GTK_WINDOW(window),GTK_WIN_POS_CENTER);
	//gtk_widget_realize (window);
	gtk_container_set_border_width (GTK_CONTAINER (window), 0);

	g_signal_connect (GTK_OBJECT(window),"destroy",
				G_CALLBACK (quit_game),&window);
	g_signal_connect (GTK_OBJECT(window),"key_press_event",
				G_CALLBACK (key_press),NULL);

	vbox = gtk_vbox_new (FALSE,0);
	gtk_container_add (GTK_CONTAINER(window),vbox);
		
	draw_area = gtk_drawing_area_new ();
	gtk_widget_set_usize (draw_area,400,400);
	//gtk_widget_set_size_request (draw_area,400,400);

	g_signal_connect (draw_area, "expose_event",
			G_CALLBACK (expose_event), NULL);
	g_signal_connect (draw_area,"configure_event",
			G_CALLBACK (configure_event), NULL);

	gtk_box_pack_start (GTK_BOX (vbox), draw_area, TRUE, TRUE, 0);

	hbox = gtk_hbox_new (FALSE,0);
	gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 5);

	b_start = gtk_button_new_with_label ("Start");
	gtk_box_pack_start (GTK_BOX (hbox), b_start, FALSE, FALSE, 0);
	g_signal_connect (b_start,"clicked",
			G_CALLBACK(game_start),NULL);

	b_pause = gtk_button_new_with_label ("Pause");
	gtk_box_pack_start (GTK_BOX (hbox), b_pause, FALSE, FALSE, 0);
	g_signal_connect (b_pause,"clicked",
			G_CALLBACK(game_pause),b_pause);

	label = gtk_label_new (" - By Linux_Lyb ( [e-mail] )");
	gtk_box_pack_start (GTK_BOX (hbox), label, TRUE,TRUE, 0);

	gtk_widget_show_all (window);
}

int main(int argc,char *argv[])
{
	srand (time(NULL));
	gtk_init (&argc,&argv);
	create_window();
	gtk_main();

	return 0;
}