ice.cpp

vc写的源程序,是关于游戏类的程序。调用了系统的很多API

#include "graphics.h"

#define MAX_ICE   100
#define ICE_SPEED 50

typedef struct
{
	int y;     // 雪花y轴位置
	int x;     // 雪花x轴位置
	int oldx;  // 雪花的X轴中心位置
	int fd;    // 雪花摇摆的幅度
	BOOL f;    // 当前的摇摆方向
	int speed; // 雪花下降的速度
	int type;  // 雪花的类型
}ICE;

LIST *ice_list; // 雪花列表
BMP  *ice_type[2]; // 雪花样式

// 初始化雪花
BOOL init_ice()
{
	ice_list = create_list();
	ice_type[0] = create_bitmap(3, 3, 0);
	if (ice_type[0] == NULL)
		return FALSE;
	ice_type[1] = create_bitmap(5, 5, 0);
	if (ice_type[1] == NULL)
		return FALSE;
	if (Is555)
		circle_fill(ice_type[0], 1, 1, 1, create_color(31, 31, 31));
	else
		circle_fill(ice_type[0], 1, 1, 1, create_color(31, 63, 31));
	if (Is555)
		circle_fill(ice_type[1], 2, 2, 2, create_color(31, 31, 31));
	else
		circle_fill(ice_type[1], 2, 2, 2, create_color(31, 63, 31));
	return TRUE;
}

// 显示雪花
void show_ice(BMP *dest)
{
	static int ice_nt, ice_ot = 0;
	BOOL update_ice;
	ice_nt = GetTickCount();
	if (ice_nt > ice_ot + ICE_SPEED)
	{
		ice_ot = ice_nt;
		update_ice = TRUE;
	}
	else
		update_ice = FALSE;
	LIST_POINT *p;
	if (ice_list->count < MAX_ICE)
	{
		// 添加新雪花
		ICE *nice = new ICE;
		if (nice == NULL)
			return;
		nice->oldx = rand() % dest->width;
		nice->y = -3, nice->x = nice->oldx;
		nice->fd = rand() % 10;
		nice->f = rand() % 1;
		nice->speed = rand() % 3 + 3;
		nice->type = rand() % 2;
		add_point(ice_list, nice);
	}
	seek_to_first(ice_list);
	p = ice_list->entry;
	while(p != NULL)
	{
		ICE *ice = (ICE *)(p->data);
		if (ice->y < dest->height)
		{
			// 显示已经有的雪花
			mask_draw_bitmap(dest, ice->x, ice->y, ice_type[ice->type]);
			if (update_ice)
			{
				ice->y += ice->speed;
				if (ice->f)
				{
					if (ice->x - ice->oldx < ice->fd)
						ice->x++;
					else
						ice->f = FALSE;
				}
				else
				{
					if (ice->oldx -ice->x < ice->fd)
						ice->x--;
					else
						ice->f = TRUE;
				}
			}
			p = p->next;
		}
		else
		{
			// 删除雪花
			delete_point(ice_list, p);
			p = ice_list->entry;
		}
	}
}

void free_ice()
{
	free_bitmap(&ice_type[0]);
	free_bitmap(&ice_type[1]);
	free_list(&ice_list);
}