Good morning!
I have a couple of questions, one simple, one not so simple. Any way, I have been working with arrays to represent tile maps.
int map[32][32]; for (int i=0;i<32;i++){ for (int j=1;j<32;j++){ map<i>[j] = rand()%2;}}
Now here i can easily set all my array elements to random numbers (this reflects my next question), But How do i initialize the array with all 1024 elements set as I want them? IE: trying to plan out a tilemap that isn't random?? I have seen examples like
int map[32][32] = {{1,1,1,1,1,1,1,1,1,1}} {{1,1,1,1,1,1,1,1}} {{.........}}
But that has never worked for me i always get a compile error!
The next subject i have come to is collision detection, this seems to be the hardest for me so far. LELete clarify, When I adhad aet map in my pong game, i could easily do the cocollisionetection because i always knew where the walls and paddles would be, but with a random tileset like my above example, how do i tell where the tiles are in my code?
What i mean is this, i have the code that makes a ball move, therefore i will always be able to check the position of the ball, but how do i detect for the placement of random collidable tiles?
Thanks for stopping by and taking a look!
Josh
]]>But How do i initialize the array with all 1024 elements set as I want them?
'new' them and then iterate through them.
but with a random tileset like my above example, how do i tell where the tiles are in my code?
Use position variables to represent where you are colliding. Then match the position of your chracter against the tilemap.
]]>But that has never worked for me i always get a compile error!
Well, in the example you just gave, you missed the commas between the sets. Try compiling the following and see what happens.
| 1 | #include <stdio.h> |
| 2 | |
| 3 | int map[10][10] = |
| 4 | {{1, 2, 3, 2, 1, 2, 3, 6, 3, 5}, |
| 5 | {8, 2, 3, 2, 1, 2, 3, 6, 3, 5}, |
| 6 | {1, 2, 3, 2, 6, 2, 3, 6, 3, 5}, |
| 7 | {2, 2, 4, 2, 1, 4, 3, 6, 1, 5}, |
| 8 | {1, 2, 8, 2, 1, 2, 3, 6, 3, 5}, |
| 9 | {1, 2, 3, 2, 1, 2, 3, 3, 5, 8}, |
| 10 | {1, 2, 3, 2, 1, 2, 3, 6, 3, 5}, |
| 11 | {8, 2, 3, 8, 1, 2, 3, 9, 3, 5}, |
| 12 | {1, 2, 3, 2, 1, 2, 3, 6, 3, 5}, |
| 13 | {1, 2, 3, 2, 1, 2, 3, 6, 3, 5}}; |
| 14 | |
| 15 | int x, y; |
| 16 | |
| 17 | int main() { |
| 18 | |
| 19 | for (x = 0; x < 10; x++) { |
| 20 | |
| 21 | for (y = 0; y < 10; y++) { |
| 22 | |
| 23 | printf("%d ", map[x][y]); |
| 24 | |
| 25 | } |
| 26 | |
| 27 | printf("\n"); |
| 28 | |
| 29 | } |
| 30 | |
| 31 | return 0; |
| 32 | |
| 33 | } |
By the way, this is a valid way of assing values to arrays, but it means you have to recompile your game every time you change a map. It's better to load the values from a file.
]]>Lenny,
Perfect thank you, The previous examples i had seen had shown ; instead of , So that explains my problem there.
well let me show, whoever is interested, My lame attempt at collision detection, it works about 15%...
| 1 | /* game design and psuedo code |
| 2 | ** initialize game |
| 3 | ** set up screen |
| 4 | ** draw paddle, ball and bricks |
| 5 | ** player launches ball |
| 6 | ** if ball is not below paddle |
| 7 | ** then move ball |
| 8 | ** else if ball collides with brick |
| 9 | ** then remove brick and add points |
| 10 | ** check to see if ball is below paddle or if all bricks are gone |
| 11 | ** then end game. |
| 12 | ** |
| 13 | ** |
| 14 | ** drawscreen() |
| 15 | ** collision() |
| 16 | ** checkball pos() |
| 17 | ** |
| 18 | ** screen is 20x15tiles X,Y |
| 19 | */ |
| 20 | |
| 21 | #include <allegro.h> |
| 22 | |
| 23 | BITMAP *ball; |
| 24 | BITMAP *paddle; |
| 25 | BITMAP *background; |
| 26 | BITMAP *brick; |
| 27 | BITMAP *buf; |
| 28 | |
| 29 | const int MIN_BALL_X = 5; |
| 30 | const int MAX_BALL_X = 635; |
| 31 | const int MIN_BALL_Y = 0; |
| 32 | const int MAX_BALL_Y = 480; |
| 33 | |
| 34 | int paddleX = 275; |
| 35 | int padTemp; |
| 36 | int ballX, ballY; |
| 37 | int dx = 0; |
| 38 | int dy = 0; |
| 39 | int ballTempX, ballTempY; |
| 40 | int brickMap[20][13]; |
| 41 | |
| 42 | bool ballOn = true; |
| 43 | |
| 44 | void init(); |
| 45 | void deinit(); |
| 46 | void drawScreen(); |
| 47 | int collide(); |
| 48 | bool movePaddle(); |
| 49 | void moveBall(); |
| 50 | void startBall(); |
| 51 | void updateScreen(); |
| 52 | |
| 53 | |
| 54 | |
| 55 | int main() { |
| 56 | init(); |
| 57 | drawScreen(); |
| 58 | while (!key[KEY_ESC]) { |
| 59 | movePaddle(); |
| 60 | updateScreen(); |
| 61 | moveBall(); |
| 62 | } |
| 63 | |
| 64 | deinit(); |
| 65 | return 0; |
| 66 | } |
| 67 | END_OF_MAIN() |
| 68 | |
| 69 | |
| 70 | |
| 71 | void drawScreen() { |
| 72 | background = load_bitmap("background.bmp", NULL); |
| 73 | paddle = load_bitmap("paddle.bmp", NULL); |
| 74 | ball = load_bitmap("ball.bmp", NULL); |
| 75 | brick = load_bitmap("brick.bmp",NULL); |
| 76 | draw_sprite(screen, background, 0, 0); |
| 77 | draw_sprite(screen, paddle, 275, 450); |
| 78 | draw_sprite(screen, ball, 314, 438); |
| 79 | |
| 80 | |
| 81 | for (int i=0; i <20; i++) |
| 82 | for (int j=0; j <13; j++) |
| 83 | { if (brickMap<i>[j] == 1) |
| 84 | draw_sprite(screen, brick, i * 32, j * 32); |
| 85 | } |
| 86 | rest(5); |
| 87 | } |
| 88 | |
| 89 | bool movePaddle() { |
| 90 | if (key[KEY_LEFT] && paddleX != 0) |
| 91 | {--paddleX; |
| 92 | if(ballOn ==true){ --ballX;} |
| 93 | } |
| 94 | else if (key[KEY_RIGHT] && paddleX + 90 != 640) |
| 95 | { ++paddleX; |
| 96 | if(ballOn == true) {++ballX;} |
| 97 | } |
| 98 | else if (key[KEY_SPACE] && ballOn == true) { |
| 99 | startBall(); |
| 100 | ballOn=false; |
| 101 | } |
| 102 | return true; |
| 103 | } |
| 104 | |
| 105 | void startBall(){ |
| 106 | dx= -1; |
| 107 | dy= 3; |
| 108 | } |
| 109 | |
| 110 | void moveBall() { |
| 111 | int ballCollisionX, ballCollisionY; |
| 112 | ballTempX=ballX; |
| 113 | ballTempY=ballY; |
| 114 | |
| 115 | ballCollisionX = ballX / 32; |
| 116 | ballCollisionY = ballY /32; |
| 117 | if (brickMap[ballCollisionX][ballCollisionY] == 1) |
| 118 | {dy = -dy;} |
| 119 | if (dy > 0 && ballX > paddleX && ballX < paddleX + 90 && ballY == 438) |
| 120 | { |
| 121 | dy = -dy; } |
| 122 | else |
| 123 | |
| 124 | if (dx < 0) |
| 125 | { |
| 126 | if (ballX + dx > MIN_BALL_X) |
| 127 | { |
| 128 | ballX += dx; |
| 129 | } |
| 130 | else |
| 131 | { |
| 132 | ballX = 2 * MIN_BALL_X - dx - ballX; |
| 133 | dx = -dx; |
| 134 | } |
| 135 | } |
| 136 | |
| 137 | else // dx > 0 |
| 138 | { |
| 139 | if (ballX + dx < MAX_BALL_X) |
| 140 | { |
| 141 | ballX += dx; |
| 142 | } |
| 143 | else |
| 144 | { |
| 145 | ballX = 2 * MAX_BALL_X - dx - ballX; |
| 146 | dx = -dx; |
| 147 | } |
| 148 | } |
| 149 | |
| 150 | if (dy < 0 ) |
| 151 | { |
| 152 | if (ballY + dy > MIN_BALL_Y ) |
| 153 | { |
| 154 | ballY += dy; |
| 155 | } |
| 156 | else |
| 157 | { |
| 158 | ballY = 2 * MIN_BALL_Y - dy - ballY; |
| 159 | dy = -dy; |
| 160 | } |
| 161 | } |
| 162 | |
| 163 | else // dy > 0 |
| 164 | { |
| 165 | if (ballY + dy < MAX_BALL_Y) |
| 166 | { |
| 167 | ballY += dy; |
| 168 | } |
| 169 | else |
| 170 | { |
| 171 | ballY = 2 * MAX_BALL_Y - dy - ballY; |
| 172 | dy = -dy; |
| 173 | } |
| 174 | |
| 175 | } |
| 176 | |
| 177 | } |
| 178 | |
| 179 | void updateScreen() { |
| 180 | padTemp= paddleX; |
| 181 | buf = create_bitmap(90,26); |
| 182 | draw_sprite(buf, paddle, 0, 0); |
| 183 | draw_sprite(screen, buf, paddleX, 450); |
| 184 | destroy_bitmap(buf); |
| 185 | buf = create_bitmap(12,12); |
| 186 | draw_sprite(buf, ball, 0,0 ); |
| 187 | draw_sprite(screen, buf, ballX, ballY); |
| 188 | rest(5); |
| 189 | } |
| 190 | void init() { |
| 191 | int depth, res; |
| 192 | allegro_init(); |
| 193 | depth = desktop_color_depth(); |
| 194 | if (depth == 0) depth = 32; |
| 195 | set_color_depth(depth); |
| 196 | res = set_gfx_mode(GFX_AUTODETECT_WINDOWED, 640, 480, 0, 0); |
| 197 | if (res != 0) { |
| 198 | allegro_message(allegro_error); |
| 199 | exit(-1); |
| 200 | } |
| 201 | |
| 202 | install_timer(); |
| 203 | install_keyboard(); |
| 204 | install_mouse(); |
| 205 | |
| 206 | ballX= 314; |
| 207 | ballY= 438; |
| 208 | for(int i=0; i < 20; i++) |
| 209 | for(int j=0; j < 13; j++) |
| 210 | brickMap<i>[j] = rand()%2; |
| 211 | /* add other initializations here */ |
| 212 | } |
| 213 | |
| 214 | void deinit() { |
| 215 | clear_keybuf(); |
| 216 | /* add other deinitializations here */ |
| 217 | } |
in particular it is this bit of code that does 'it' wwhateverit is
ballCollisionX = ballX / 32; ballCollisionY = ballY /32; if (brickMap[ballCollisionX][ballCollisionY] == 1) {dy = -dy;}
I take my ball's x and y and divide them by 32, in theory this gives me a whole number 1,2 etc since my tile size is 32x32. I then plug the divdividedy into the tilemap to see if it equals a collidable tile, if it does i change the direction of the ball. Obviously this is very rudimentary and imperfect...
I atatched the BMPs i am using so you can compile and check out exactly what it is doing...
thanks again!
EDIT: i guess one solution would to be ta make sure that the ballCOllisionX and Y are divisible by 1 to make sure they are whoel numbers? i can't use !/ i get a compile error /! works untill i run the program then it crashes!
EDIT 2: wait an int has to be a whol enumber doesn't it, thats why we have floating point variables.... Hmmm so then back to the drawing board on that one!
]]>