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如何從使用結構類更改類？該代碼沒有任何問題。但我想如何把它放在課堂上。 你會如何改變它的建議。那裏沒有問題。只是一個簡單的問題轉換。C++從結構類更改？
這是我在C++中的頭文件。
struct SpaceShip
{
int ID;
int x;
int y;
int lives;
int speed;
int boundx;
int boundy;
int score;
};
struct Bullet
{
int ID;
int x;
int y;
bool live;
int speed;
};
struct Comet
{
int ID;
int x;
int y;
bool live;
int speed;
int boundx;
int boundy;
};
這是我的main.cpp文件。
#include <allegro5\allegro.h>
#include <allegro5\allegro_primitives.h>
#include <allegro5\allegro_font.h>
#include <allegro5\allegro_ttf.h>
#include "objects.h"
//GLOBALS==============================
const int WIDTH = 800;
const int HEIGHT = 400;
const int NUM_BULLETS = 5;
const int NUM_COMETS = 10;
enum KEYS { UP, DOWN, LEFT, RIGHT, SPACE };
bool keys[5] = { false, false, false, false, false };
//prototypes
void InitShip(SpaceShip &ship);
void DrawShip(SpaceShip &ship);
void MoveShipUp(SpaceShip &ship);
void MoveShipDown(SpaceShip &ship);
void MoveShipLeft(SpaceShip &ship);
void MoveShipRight(SpaceShip &ship);
void InitBullet(Bullet bullet[], int size);
void DrawBullet(Bullet bullet[], int size);
void FireBullet(Bullet bullet[], int size, SpaceShip &ship);
void UpdateBullet(Bullet bullet[], int size);
void CollideBullet(Bullet bullet[], int bSize, Comet comets[], int cSize, SpaceShip &ship);
void InitComet(Comet comets[], int size);
void DrawComet(Comet comets[], int size);
void StartComet(Comet comets[], int size);
void UpdateComet(Comet comets[], int size);
void CollideComet(Comet comets[], int cSize, SpaceShip &ship);
int main(void)
{
//primitive variable
bool done = false;
bool redraw = true;
const int FPS = 60;
bool isGameOver = false;
//object variables
SpaceShip ship;
Bullet bullets[NUM_BULLETS];
Comet comets[NUM_COMETS];
//Allegro variables
ALLEGRO_DISPLAY *display = NULL;
ALLEGRO_EVENT_QUEUE *event_queue = NULL;
ALLEGRO_TIMER *timer = NULL;
ALLEGRO_FONT *font18 = NULL;
//Initialization Functions
if (!al_init()) //initialize Allegro
return -1;
display = al_create_display(WIDTH, HEIGHT); //create our display object
if (!display) //test display object
return -1;
al_init_primitives_addon();
al_install_keyboard();
al_init_font_addon();
al_init_ttf_addon();
event_queue = al_create_event_queue();
timer = al_create_timer(1.0/FPS);
srand(time(NULL));
InitShip(ship);
InitBullet(bullets, NUM_BULLETS);
InitComet(comets, NUM_COMETS);
font18 = al_load_font("arial.ttf", 18, 0);
al_register_event_source(event_queue, al_get_keyboard_event_source());
al_register_event_source(event_queue, al_get_timer_event_source(timer));
al_register_event_source(event_queue, al_get_display_event_source(display));
al_start_timer(timer);
while (!done)
{
ALLEGRO_EVENT ev;
al_wait_for_event(event_queue, &ev);
if (ev.type == ALLEGRO_EVENT_TIMER)
{
redraw = true;
if (keys[UP])
MoveShipUp(ship);
if (keys[DOWN])
MoveShipDown(ship);
if (keys[LEFT])
MoveShipLeft(ship);
if (keys[RIGHT])
MoveShipRight(ship);
if (!isGameOver)
{
UpdateBullet(bullets, NUM_BULLETS);
StartComet(comets, NUM_COMETS);
UpdateComet(comets, NUM_COMETS);
CollideBullet(bullets, NUM_BULLETS, comets, NUM_COMETS, ship);
CollideComet(comets, NUM_COMETS, ship);
if (ship.lives <= 0)
isGameOver = true;
}
}
else if (ev.type == ALLEGRO_EVENT_DISPLAY_CLOSE)
{
done = true;
}
else if (ev.type == ALLEGRO_EVENT_KEY_DOWN)
{
switch (ev.keyboard.keycode)
{
case ALLEGRO_KEY_ESCAPE:
done = true;
break;
case ALLEGRO_KEY_UP:
keys[UP] = true;
break;
case ALLEGRO_KEY_DOWN:
keys[DOWN] = true;
break;
case ALLEGRO_KEY_LEFT:
keys[LEFT] = true;
break;
case ALLEGRO_KEY_RIGHT:
keys[RIGHT] = true;
break;
case ALLEGRO_KEY_SPACE:
keys[SPACE] = true;
FireBullet(bullets, NUM_BULLETS, ship);
break;
}
}
else if (ev.type == ALLEGRO_EVENT_KEY_UP)
{
switch (ev.keyboard.keycode)
{
case ALLEGRO_KEY_ESCAPE:
done = true;
break;
case ALLEGRO_KEY_UP:
keys[UP] = false;
break;
case ALLEGRO_KEY_DOWN:
keys[DOWN] = false;
break;
case ALLEGRO_KEY_LEFT:
keys[LEFT] = false;
break;
case ALLEGRO_KEY_RIGHT:
keys[RIGHT] = false;
break;
case ALLEGRO_KEY_SPACE:
keys[SPACE] = false;
break;
}
}
if (redraw && al_is_event_queue_empty(event_queue))
{
redraw = false;
if (!isGameOver)
{
DrawShip(ship);
DrawBullet(bullets, NUM_BULLETS);
DrawComet(comets, NUM_COMETS);
al_draw_textf(font18, al_map_rgb(255, 0, 255), 5, 5, 0, "Player has %i lives left. Player has destroyed %i objects", ship.lives, ship.score);
}
else
{
al_draw_textf(font18, al_map_rgb(0, 255, 255), WIDTH/2, HEIGHT/2, ALLEGRO_ALIGN_CENTRE, "Game Over. Final Score: %i", ship.score);
}
al_flip_display();
al_clear_to_color(al_map_rgb(0, 0, 0));
}
}
al_destroy_event_queue(event_queue);
al_destroy_timer(timer);
al_destroy_font(font18);
al_destroy_display(display); //destroy our display object
return 0;
}
void InitShip(SpaceShip &ship)
{
ship.x = 20;
ship.y = HEIGHT/2;
ship.ID = PLAYER;
ship.lives = 3;
ship.speed = 7;
ship.boundx = 6;
ship.boundy = 7;
ship.score = 0;
}
void DrawShip(SpaceShip &ship)
{
al_draw_filled_rectangle(ship.x, ship.y - 9, ship.x + 10, ship.y - 7, al_map_rgb(255, 0, 0));
al_draw_filled_rectangle(ship.x, ship.y + 9, ship.x + 10, ship.y + 7, al_map_rgb(255, 0, 0));
al_draw_filled_triangle(ship.x - 12, ship.y - 17, ship.x + 12, ship.y, ship.x - 12, ship.y + 17, al_map_rgb(0, 255, 0));
al_draw_filled_rectangle(ship.x - 12, ship.y - 2, ship.x + 15, ship.y + 2, al_map_rgb(0, 0, 255));
}
void MoveShipUp(SpaceShip &ship)
{
ship.y -= ship.speed;
if (ship.y < 0)
ship.y = 0;
}
void MoveShipDown(SpaceShip &ship)
{
ship.y += ship.speed;
if (ship.y > HEIGHT)
ship.y = HEIGHT;
}
void MoveShipLeft(SpaceShip &ship)
{
ship.x -= ship.speed;
if (ship.x < 0)
ship.x = 0;
}
void MoveShipRight(SpaceShip &ship)
{
ship.x += ship.speed;
if (ship.x > 300)
ship.x = 300;
}
void InitBullet(Bullet bullet[], int size)
{
for (int i = 0; i < size; i++)
{
bullet[i].ID = BULLET;
bullet[i].speed = 10;
bullet[i].live = false;
}
}
void DrawBullet(Bullet bullet[], int size)
{
for (int i = 0; i < size; i++)
{
if (bullet[i].live)
al_draw_filled_circle(bullet[i].x, bullet[i].y, 2, al_map_rgb(255, 255, 255));
}
}
void FireBullet(Bullet bullet[], int size, SpaceShip &ship)
{
for (int i = 0; i < size; i++)
{
if (!bullet[i].live)
{
bullet[i].x = ship.x + 17;
bullet[i].y = ship.y;
bullet[i].live = true;
break;
}
}
}
void UpdateBullet(Bullet bullet[], int size)
{
for (int i = 0; i < size; i++)
{
if (bullet[i].live)
{
bullet[i].x += bullet[i].speed;
if (bullet[i].x > WIDTH)
bullet[i].live = false;
}
}
}
void CollideBullet(Bullet bullet[], int bSize, Comet comets[], int cSize, SpaceShip &ship)
{
for (int i = 0; i < bSize; i++)
{
if (bullet[i].live)
{
for (int j = 0; j < cSize; j++)
{
if (comets[j].live)
{
if (bullet[i].x >(comets[j].x - comets[j].boundx) &&
bullet[i].x < (comets[j].x + comets[j].boundx) &&
bullet[i].y >(comets[j].y - comets[j].boundy) &&
bullet[i].y < (comets[j].y + comets[j].boundy))
{
bullet[i].live = false;
comets[j].live = false;
ship.score++;
}
}
}
}
}
}
void InitComet(Comet comets[], int size)
{
for (int i = 0; i < size; i++)
{
comets[i].ID = ENEMY;
comets[i].live = false;
comets[i].speed = 5;
comets[i].boundx = 18;
comets[i].boundy = 18;
}
}
void DrawComet(Comet comets[], int size)
{
for (int i = 0; i < size; i++)
{
if (comets[i].live)
{
al_draw_filled_circle(comets[i].x, comets[i].y, 20, al_map_rgb(255, 0, 0));
}
}
}
void StartComet(Comet comets[], int size)
{
for (int i = 0; i < size; i++)
{
if (!comets[i].live)
{
if (rand() % 500 == 0)
{
comets[i].live = true;
comets[i].x = WIDTH;
comets[i].y = 30 + rand() % (HEIGHT - 60);
break;
}
}
}
}
void UpdateComet(Comet comets[], int size)
{
for (int i = 0; i < size; i++)
{
if (comets[i].live)
{
comets[i].x -= comets[i].speed;
}
}
}
void CollideComet(Comet comets[], int cSize, SpaceShip &ship)
{
for (int i = 0; i < cSize; i++)
{
if (comets[i].live)
{
if (comets[i].x - comets[i].boundx < ship.x + ship.boundx &&
comets[i].x + comets[i].boundx > ship.x - ship.boundx &&
comets[i].y - comets[i].boundy < ship.y + ship.boundy &&
comets[i].y + comets[i].boundy > ship.y - ship.boundy)
{
ship.lives--;
comets[i].live = false;
}
else if (comets[i].x < 0)
{
comets[i].live = false;
ship.lives--;
}
}
}
}
你應該添加與該結構相對應的自由函數作爲類的成員函數。 –
將**結構**更改爲**類**，並在開始處添加** public **類訪問修飾符，使其工作原樣爲 –