Hi, im currently writing a space invaders clone using allegro, I can fire and everything however im having trouble getting collisions to work, I currently have a enemy ship member function called isHit which makes the checks... well heres my code... I really need help with this.
#include <allegro.h>
#include <vector> // To use the vector class
#include <algorithm> // To use for_each
#include <functional> // To use mem_fun_ref
#include "siheader.h"
using namespace std;
void init();
void deinit();
int main() {
init();
vector<Ship> ships;
vector<bullet> bullets;
// Create a new ship and add it to the end of the vector
for (int x=50; x<750; x=x+35) {
for (int y=20; y<200; y=y+35) {
ships.push_back( Ship(x, y) );
}
}
//playervariables
int player_x=400;
int player_y=500;
BITMAP *playerImage;
playerImage = load_bitmap( "test.bmp", NULL);
BITMAP *backGround;
backGround = load_bitmap( "back.bmp", NULL);
while (!key[KEY_ESC]) {
acquire_screen();
draw_sprite(screen, backGround, 0,0);
if (key[KEY_RIGHT]) {
player_x=player_x+4;
}
if (key[KEY_LEFT]){
if (player_x > 0){
player_x=player_x-4;
}
}
if (key[KEY_SPACE]) {
bullets.push_back( bullet(player_x, player_y) );
}
for (int i = 0; i < ships.size(); i++) {
ships.update();
}
for (int i = 0; i < bullets.size(); i++) {
bullets.update();
bullets.isDestroyed();
}
for (int i = 0; i < bullets.size(); i++) {
for (int i = 0; i < ships.size(); i++) {
ships.isHit(bullets.returnX);
}
}
//for_each(ships.begin(), ships.end(), mem_fun_ref(&Ship::update));
//for_each(bullets.begin(), bullets.end(), mem_fun_ref(&bullet::update));
//bullets.erase(remove_if(bullets.begin(), bullets.end(), mem_fun_ref(&bullet::isDestroyed)), bullets.end());
rotate_sprite(screen, playerImage, player_x+100, player_y-100, itofix(player_x));
draw_sprite(screen, playerImage, player_x, player_y);
textout_ex(screen, font, "BLAH", 10, 590,makecol(255, 255, 255), -1);
release_screen();
}
deinit();
return 0;
}
END_OF_MAIN()
void init() {
int depth, res;
allegro_init();
depth = desktop_color_depth();
if (depth == 0) depth = 32;
set_color_depth(depth);
res = set_gfx_mode(GFX_AUTODETECT_WINDOWED, 800, 600, 0, 0);
if (res != 0) {
allegro_message(allegro_error);
exit(-1);
}
install_timer();
install_keyboard();
install_mouse();
/* add other initializations here */
}
void deinit() {
clear_keybuf();
/* add other deinitializations here */
}
and heres the siheader include...
class Ship {
private: // We don't want external code to access the coordinates directly
int x, y;
public: // We do want external code to be able to call these functions
// This creates a Ship object with the appropriate coordinates
Ship(int xpos,int ypos) :
x(xpos), // Sets the ship's x to xpos
y(ypos) // Sets the ship's y to ypos
{
// No code is currently required here.
// Things may change as your class grows.
}
void update() {
circlefill( screen, x, y, 15, makecol(255,255,255));
if (mouse_b & 1) {
y=y+1;
}
}
void isHit(bulletX){
if (bulletX = x){
exit(-1);
}
}
};
class bullet {
private: // We don't want external code to access the coordinates directly
int x, y;
public: // We do want external code to be able to call these functions
// This creates a Ship object with the appropriate coordinates
bullet(int xpos,int ypos) :
x(xpos),
y(ypos)
{
// No code is currently required here.
// Things may change as your class grows.
}
bool isDestroyed() {
if (y<-10) {
return true;
}
return false;
}
void update() {
circlefill( screen, x, y, 15, makecol(255,255,255));
y=y-5;
//if (y<400) {
//x=0;
//y=0;
//}
}
int returnX() {
return x;
}
};
Is there a better way to do this? Or any way to get it working?
