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| Autoshooter on this game |
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AleX-G Squadron
Member #13,593
October 2011
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I am trying to add an autoshooter to this game i was building from scratch but it seems unclear this concept to me. (It is based on mike geig shooter) 1#include <allegro5\allegro.h>
2#include <allegro5\allegro_primitives.h>
3#include <allegro5\allegro_image.h>
4#include <allegro5\allegro_ttf.h>
5#include <allegro5\allegro_font.h>
6#include "objects.h"
7
8// Buttons
9enum BUTON{A,S,D,W,SPACE};
10bool buton[5] = {false,false,false,false,false};
11
12// Globals
13const int FPS = 80, width = 800, height = 600;
14const int NUM_BULLETS = 5;
15
16// Protorypes
17void InitShip(SpaceShip &ship);
18void DrawShip(SpaceShip &ship);
19void MoveShipUp(SpaceShip &ship);
20void MoveShipDown(SpaceShip &ship);
21void MoveShipLeft(SpaceShip &ship);
22void MoveShipRight(SpaceShip &ship);
23
24void InitBullet(Bullet bullet[], int size);
25void DrawBullet(Bullet bullet[], int size);
26void FireBullet(Bullet bullet[], int size, SpaceShip &ship);
27void UpdateBullet(Bullet bullet[], int size);
28
29int main()
30{
31 // Initialization
32 al_init();
33 al_init_primitives_addon();
34 al_init_image_addon();
35 al_init_font_addon();
36 al_init_ttf_addon();
37
38 // Installations
39 al_install_keyboard();
40 al_install_mouse();
41
42 // Variables
43 SpaceShip ship;
44 Bullet bullets[5];
45 int fireCooldown = 0;
46
47 int x = width / 2;
48 int y = height / 2;
49
50 bool quit = false;
51 bool draw = true;
52
53 // ALLEGRO variables
54 ALLEGRO_DISPLAY *window = al_create_display(width, height);
55 ALLEGRO_BITMAP *icon = al_load_bitmap("image/1.png");
56 ALLEGRO_FONT *font16 = al_load_ttf_font("fonts/1.ttf", 80, ALLEGRO_ALIGN_CENTRE);
57 ALLEGRO_TIMER *timer = NULL;
58 ALLEGRO_EVENT_QUEUE *event = NULL;
59
60 event = al_create_event_queue();
61 timer = al_create_timer(1.0 / FPS);
62
63 // Events
64 al_register_event_source(event, al_get_keyboard_event_source());
65 al_register_event_source(event, al_get_mouse_event_source());
66 al_register_event_source(event, al_get_display_event_source(window));
67 al_register_event_source(event, al_get_timer_event_source(timer));
68
69 // Window title, icon and mouse hide
70 al_set_window_title(window, "Game programming");
71 al_set_display_icon(window, icon);
72 al_hide_mouse_cursor(window);
73
74 // Player initializations
75 InitShip(ship);
76 InitBullet(bullets, NUM_BULLETS);
77
78 // Start timer
79 al_start_timer(timer);
80
81
82 // The drawing
83 while(!quit)
84 {
85 // Call of the event
86 ALLEGRO_EVENT e;
87 al_wait_for_event(event, &e);
88
89 // Drawing
90 if(e.type == ALLEGRO_EVENT_TIMER)
91 {
92 draw = true;
93
94 if(buton[A])
95 MoveShipLeft(ship);
96 if(buton[D])
97 MoveShipRight(ship);
98 if(buton[S])
99 MoveShipDown(ship);
100 if(buton[W])
101 MoveShipUp(ship);
102
103 UpdateBullet(bullets, NUM_BULLETS);
104 }
105
106 // Key down or up
107 switch(e.type)
108 {
109 case ALLEGRO_EVENT_KEY_DOWN:
110 switch(e.keyboard.keycode)
111 {
112 case ALLEGRO_KEY_A:
113 buton[A] = true;
114 break;
115
116 case ALLEGRO_KEY_S:
117 buton[S] = true;
118 break;
119
120 case ALLEGRO_KEY_D:
121 buton[D] = true;
122 break;
123
124 case ALLEGRO_KEY_W:
125 buton[W] = true;
126 break;
127
128 case ALLEGRO_KEY_SPACE:
129 buton[SPACE] = true;
130 FireBullet(bullets, NUM_BULLETS, ship);
131 break;
132
133 case ALLEGRO_KEY_ESCAPE:
134 quit = true;
135 break;
136 }
137 }
138
139 switch(e.type)
140 {
141 case ALLEGRO_EVENT_KEY_UP:
142 switch(e.keyboard.keycode)
143 {
144 case ALLEGRO_KEY_A:
145 buton[A] = false;
146 break;
147
148 case ALLEGRO_KEY_S:
149 buton[S] = false;
150 break;
151
152 case ALLEGRO_KEY_D:
153 buton[D] = false;
154 break;
155
156 case ALLEGRO_KEY_W:
157 buton[W] = false;
158 break;
159
160 case ALLEGRO_KEY_SPACE:
161 buton[SPACE] = false;
162 break;
163 }
164 }
165
166
167 // Close display when X is pressed
168 if(e.type == ALLEGRO_EVENT_DISPLAY_CLOSE)
169 {
170 quit = true;
171 }
172
173 // Mouse movement
174 else if(e.type == ALLEGRO_EVENT_MOUSE_AXES)
175 {
176 ship.y = e.mouse.y;
177 }
178
179 else if(e.mouse.button & 1)
180 {
181 FireBullet(bullets, NUM_BULLETS, ship);
182 }
183
184 if(draw && al_event_queue_is_empty(event))
185 {
186 draw = false;
187 DrawShip(ship);
188 DrawBullet(bullets, NUM_BULLETS);
189
190 al_flip_display();
191 al_clear_to_color(al_map_rgb(0,0,0));
192 }
193
194 }
195
196 // Destroy
197 al_destroy_event_queue(event);
198 al_destroy_bitmap(icon);
199 al_destroy_display(window);
200}
201
202void InitShip(SpaceShip &ship)
203{
204 ship.x = 20;
205 ship.y = height / 2;
206 ship.ID = PLAYER;
207 ship.lives = 3;
208 ship.speed = 7;
209 ship.boundx = 6;
210 ship.boundy = 7;
211 ship.score = 0;
212}
213
214void DrawShip(SpaceShip &ship)
215{
216 al_draw_filled_rectangle(ship.x - 10, ship.y-15, ship.x + 35, ship.y, al_map_rgb(255,128,0));
217 al_draw_filled_rectangle(ship.x + 35, ship.y-15, ship.x + 130, ship.y, al_map_rgb(255,255,255));
218}
219
220void MoveShipUp(SpaceShip &ship)
221{
222 ship.y -= ship.speed;
223 if(ship.y < 15)
224 ship.y = 15;
225}
226
227void MoveShipDown(SpaceShip &ship)
228{
229 ship.y += ship.speed;
230 if(ship.y > height)
231 ship.y = height;
232}
233
234void MoveShipLeft(SpaceShip &ship)
235{
236 ship.x -= ship.speed;
237 if(ship.x < 10)
238 ship.x = 10;
239}
240
241void MoveShipRight(SpaceShip &ship)
242{
243 ship.x += ship.speed;
244 if(ship.x > 100)
245 ship.x = 100;
246}
247
248void InitBullet(Bullet bullet[], int size)
249{
250 for(int i = 0; i < size; i++)
251 {
252 bullet[i].ID = BULLET;
253 bullet[i].speed = 10;
254 bullet[i].live = false;
255 }
256}
257
258void DrawBullet(Bullet bullet[], int size)
259{
260 for(int i = 0; i < size; i++)
261 {
262 if(bullet[i].live)
263 al_draw_filled_circle(bullet[i].x, bullet[i].y, 5, al_map_rgb(128,128,128));
264 }
265}
266
267void FireBullet(Bullet bullet[], int size, SpaceShip &ship)
268{
269 for(int i = 0; i < size; i++)
270 {
271 if(!bullet[i].live)
272 {
273 bullet[i].x = ship.x + 120;
274 bullet[i].y = ship.y - 7;
275 bullet[i].live = true;
276 break;
277 }
278 }
279}
280
281void UpdateBullet(Bullet bullet[], int size)
282{
283 for(int i = 0; i < size; i++)
284 {
285 if(bullet[i].live)
286 {
287 bullet[i].x += bullet[i].speed;
288 if(bullet[i].x > width)
289 {
290 bullet[i].live = false;
291 break;
292 }
293 }
294 }
295}
objects.h 1// Objects IDs
2enum ID{PLAYER, BULLET, ENEMY};
3
4// The player
5struct SpaceShip
6{
7 int ID;
8 int x;
9 int y;
10 int lives;
11 int speed;
12 int boundx;
13 int boundy;
14 int score;
15};
16
17struct Bullet
18{
19 int ID;
20 int x;
21 int y;
22 bool live;
23 int speed;
24};
www.anothergames.com |
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l j
Member #10,584
January 2009
 |
1#include <allegro5\allegro.h>
2#include <allegro5\allegro_primitives.h>
3#include <allegro5\allegro_image.h>
4#include <allegro5\allegro_ttf.h>
5#include <allegro5\allegro_font.h>
6#include "objects.h"
7
8// Buttons
9enum BUTON{A,S,D,W,SPACE};
10bool buton[5] = {false,false,false,false,false};
11
12// Globals
13const int FPS = 80, width = 800, height = 600;
14const int NUM_BULLETS = 5;
15
16// Protorypes
17void InitShip(SpaceShip &ship);
18void DrawShip(SpaceShip &ship);
19void MoveShipUp(SpaceShip &ship);
20void MoveShipDown(SpaceShip &ship);
21void MoveShipLeft(SpaceShip &ship);
22void MoveShipRight(SpaceShip &ship);
23
24void InitBullet(Bullet bullet[], int size);
25void DrawBullet(Bullet bullet[], int size);
26void FireBullet(Bullet bullet[], int size, SpaceShip &ship);
27void UpdateBullet(Bullet bullet[], int size);
28
29int main()
30{
31 // Initialization
32 al_init();
33 al_init_primitives_addon();
34 al_init_image_addon();
35 al_init_font_addon();
36 al_init_ttf_addon();
37
38 // Installations
39 al_install_keyboard();
40 al_install_mouse();
41
42 // Variables
43 SpaceShip ship;
44 Bullet bullets[5];
45 // I don't think you are actually using this variable
46 int fireCooldown = 0;
47
48 int x = width / 2;
49 int y = height / 2;
50
51 bool quit = false;
52 bool draw = true;
53
54 // ALLEGRO variables
55 ALLEGRO_DISPLAY *window = al_create_display(width, height);
56 ALLEGRO_BITMAP *icon = al_load_bitmap("image/1.png");
57 ALLEGRO_FONT *font16 = al_load_ttf_font("fonts/1.ttf", 80, ALLEGRO_ALIGN_CENTRE);
58 ALLEGRO_TIMER *timer = NULL;
59 ALLEGRO_EVENT_QUEUE *event = NULL;
60
61 event = al_create_event_queue();
62 timer = al_create_timer(1.0 / FPS);
63
64 // Events
65 al_register_event_source(event, al_get_keyboard_event_source());
66 al_register_event_source(event, al_get_mouse_event_source());
67 al_register_event_source(event, al_get_display_event_source(window));
68 al_register_event_source(event, al_get_timer_event_source(timer));
69
70 // Window title, icon and mouse hide
71 al_set_window_title(window, "Game programming");
72 al_set_display_icon(window, icon);
73 al_hide_mouse_cursor(window);
74
75 // Player initializations
76 InitShip(ship);
77 InitBullet(bullets, NUM_BULLETS);
78
79 // Start timer
80 al_start_timer(timer);
81
82
83 // The drawing
84 while(!quit)
85 {
86 // Call of the event
87 ALLEGRO_EVENT e;
88 al_wait_for_event(event, &e);
89
90 // Drawing
91 if(e.type == ALLEGRO_EVENT_TIMER)
92 {
93 draw = true;
94
95 if(buton[A])
96 MoveShipLeft(ship);
97 if(buton[D])
98 MoveShipRight(ship);
99 if(buton[S])
100 MoveShipDown(ship);
101 if(buton[W])
102 MoveShipUp(ship);
103 // Why didn't you apply the same logic to firing your bullets?
104 if(buton[SPACE])
105 {
106 // also it's button, you got it right in the comments though.
107 // Or is this a different language?
108 if(fireCooldown == 0)
109 {
110 // We'll decrement this variable later
111 // This block will only get executed if fireCooldown equals 0
112 fireCooldown = 10;
113 // Now that we've assigned 10 to fireCooldown we can be sure the next bullet is not going to be fired for a couple of frames
114 FireBullet(bullets, NUM_BULLETS, ship);
115 }
116 }
117
118 // Let's get the ship ready for the next shot
119 if(fireCooldown > 0)
120 fireCooldown--;
121
122
123 UpdateBullet(bullets, NUM_BULLETS);
124 }
125
126 // Key down or up
127 switch(e.type)
128 {
129 case ALLEGRO_EVENT_KEY_DOWN:
130 switch(e.keyboard.keycode)
131 {
132 case ALLEGRO_KEY_A:
133 buton[A] = true;
134 break;
135
136 case ALLEGRO_KEY_S:
137 buton[S] = true;
138 break;
139
140 case ALLEGRO_KEY_D:
141 buton[D] = true;
142 break;
143
144 case ALLEGRO_KEY_W:
145 buton[W] = true;
146 break;
147
148 case ALLEGRO_KEY_SPACE:
149 buton[SPACE] = true;
150 // Now you are going to fire a bullet each time you press your spacebar, so let's move this out of here
151 //FireBullet(bullets, NUM_BULLETS, ship);
152
153 break;
154
155 case ALLEGRO_KEY_ESCAPE:
156 quit = true;
157 break;
158 }
159 }
160
161 switch(e.type)
162 {
163 case ALLEGRO_EVENT_KEY_UP:
164 switch(e.keyboard.keycode)
165 {
166 case ALLEGRO_KEY_A:
167 buton[A] = false;
168 break;
169
170 case ALLEGRO_KEY_S:
171 buton[S] = false;
172 break;
173
174 case ALLEGRO_KEY_D:
175 buton[D] = false;
176 break;
177
178 case ALLEGRO_KEY_W:
179 buton[W] = false;
180 break;
181
182 case ALLEGRO_KEY_SPACE:
183 buton[SPACE] = false;
184 break;
185 }
186 }
187
188
189 // Close display when X is pressed
190 if(e.type == ALLEGRO_EVENT_DISPLAY_CLOSE)
191 {
192 quit = true;
193 }
194
195 // Mouse movement
196 else if(e.type == ALLEGRO_EVENT_MOUSE_AXES)
197 {
198 ship.y = e.mouse.y;
199 }
200
201 // Bad idea, an ALLEGRO_EVENT is an union
202 // Meaning that multiple different members can take the same place in memory
203 // Other events might 'overwrite' e.mouse.button, causing it to falsely evaluate to true and this is more likely than you might think as it caused the firing to seem irregular with this not being commented
204 /*else if(e.mouse.button & 1)
205 {
206 FireBullet(bullets, NUM_BULLETS, ship);
207 }*/
208 if(e.type == ALLEGRO_EVENT_MOUSE_BUTTON_DOWN)
209 {
210 if(e.mouse.button & 1)
211 {
212 buton[SPACE] = true; // Ugly hack but it works
213 }
214 }
215 else if(e.type == ALLEGRO_EVENT_MOUSE_BUTTON_UP)
216 {
217 if(e.mouse.button & 1)
218 {
219 buton[SPACE] = false;
220 }
221 }
222
223 if(draw && al_event_queue_is_empty(event))
224 {
225 draw = false;
226 DrawShip(ship);
227 DrawBullet(bullets, NUM_BULLETS);
228
229 al_flip_display();
230 al_clear_to_color(al_map_rgb(0,0,0));
231 }
232
233 }
234
235 // Destroy
236 al_destroy_event_queue(event);
237 al_destroy_bitmap(icon);
238 al_destroy_display(window);
239}
240
241void InitShip(SpaceShip &ship)
242{
243 ship.x = 20;
244 ship.y = height / 2;
245 ship.ID = PLAYER;
246 ship.lives = 3;
247 ship.speed = 7;
248 ship.boundx = 6;
249 ship.boundy = 7;
250 ship.score = 0;
251}
252
253void DrawShip(SpaceShip &ship)
254{
255 al_draw_filled_rectangle(ship.x - 10, ship.y-15, ship.x + 35, ship.y, al_map_rgb(255,128,0));
256 al_draw_filled_rectangle(ship.x + 35, ship.y-15, ship.x + 130, ship.y, al_map_rgb(255,255,255));
257}
258
259void MoveShipUp(SpaceShip &ship)
260{
261 ship.y -= ship.speed;
262 if(ship.y < 15)
263 ship.y = 15;
264}
265
266void MoveShipDown(SpaceShip &ship)
267{
268 ship.y += ship.speed;
269 if(ship.y > height)
270 ship.y = height;
271}
272
273void MoveShipLeft(SpaceShip &ship)
274{
275 ship.x -= ship.speed;
276 if(ship.x < 10)
277 ship.x = 10;
278}
279
280void MoveShipRight(SpaceShip &ship)
281{
282 ship.x += ship.speed;
283 if(ship.x > 100)
284 ship.x = 100;
285}
286
287void InitBullet(Bullet bullet[], int size)
288{
289 for(int i = 0; i < size; i++)
290 {
291 bullet[i].ID = BULLET;
292 bullet[i].speed = 10;
293 bullet[i].live = false;
294 }
295}
296
297void DrawBullet(Bullet bullet[], int size)
298{
299 for(int i = 0; i < size; i++)
300 {
301 if(bullet[i].live)
302 al_draw_filled_circle(bullet[i].x, bullet[i].y, 5, al_map_rgb(128,128,128));
303 }
304}
305
306void FireBullet(Bullet bullet[], int size, SpaceShip &ship)
307{
308 for(int i = 0; i < size; i++)
309 {
310 if(!bullet[i].live)
311 {
312 bullet[i].x = ship.x + 120;
313 bullet[i].y = ship.y - 7;
314 bullet[i].live = true;
315 break;
316 }
317 }
318}
319
320void UpdateBullet(Bullet bullet[], int size)
321{
322 for(int i = 0; i < size; i++)
323 {
324 if(bullet[i].live)
325 {
326 bullet[i].x += bullet[i].speed;
327 if(bullet[i].x > width)
328 {
329 bullet[i].live = false;
330 break;
331 }
332 }
333 }
334}
Well most of your code worked, I just don't understand why you decided to handle your shooting so different in comparison to the movement of the ship.
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AleX-G Squadron
Member #13,593
October 2011
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So you mean this is the code block which makes the autoshooting? 1 // Why didn't you apply the same logic to firing your bullets?
2 if(buton[SPACE])
3 {
4 // also it's button, you got it right in the comments though.
5 // Or is this a different language?
6 if(fireCooldown == 0)
7 {
8 // We'll decrement this variable later
9 // This block will only get executed if fireCooldown equals 0
10 fireCooldown = 10;
11 // Now that we've assigned 10 to fireCooldown we can be sure the next bullet is not going to be fired for a couple of frames
12 FireBullet(bullets, NUM_BULLETS, ship);
13 }
14 }
15
16
17 // Let's get the ship ready for the next shot
18 if(fireCooldown > 0)
19 fireCooldown--;
And than i can apply int firecooldown to all games i will create? Also, i didnt understand why did you put firecooldown = 10. What is the logic? www.anothergames.com |
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J-Gamer
Member #12,491
January 2011
 |
That code fires every 10 ticks. You can increase it to lower the rate of fire, or decrease it to make it fire faster. " There are plenty of wonderful ideas in The Bible, but God isn't one of them." - Derezo |
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AleX-G Squadron
Member #13,593
October 2011
|
Just did that www.anothergames.com |
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l j
Member #10,584
January 2009
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Yes, every time you fire a bullet the counter will get increased. As long as this counter is not zero the next bullet won't be fired.
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AleX-G Squadron
Member #13,593
October 2011
|
Ok, thank you very much! www.anothergames.com |
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