comparison: test/snake/snake.c
test/snake/snake.c
- changeset 216
- 943980fa37b5
- parent 215
- a7c8e1727971
equal
deleted
inserted
replaced
| 215:a7c8e1727971 | 216:943980fa37b5 |
|---|---|
| 54 static asc_transform rotations[4]; | 54 static asc_transform rotations[4]; |
| 55 static asc_vec2f directions[4]; | 55 static asc_vec2f directions[4]; |
| 56 | 56 |
| 57 typedef struct { | 57 typedef struct { |
| 58 enum MoveDirection direction; | 58 enum MoveDirection direction; |
| 59 enum MoveDirection target_direction; | |
| 59 /** | 60 /** |
| 60 * The speed in tiles per second. | 61 * The speed in tiles per second. |
| 61 */ | 62 */ |
| 62 float speed; | 63 float speed; |
| 63 } Spaceship; | 64 } Spaceship; |
| 150 } | 151 } |
| 151 | 152 |
| 152 static void move_spaceship(AscBehavior *behavior) { | 153 static void move_spaceship(AscBehavior *behavior) { |
| 153 AscSceneNode *node = behavior->node; | 154 AscSceneNode *node = behavior->node; |
| 154 Spaceship *spaceship = node->user_data; | 155 Spaceship *spaceship = node->user_data; |
| 155 float speed = 32.f * spaceship->speed * asc_context.frame_factor; | 156 const float ts = (float) game_field_tile_size; |
| 156 asc_vec2f movement = asc_vec2f_scale(directions[spaceship->direction], speed); | 157 const float speed = ts * spaceship->speed * asc_context.frame_factor; |
| 157 asc_scene_node_move2f(node, movement); | 158 const asc_vec2f dvec = directions[spaceship->direction]; |
| 158 asc_scene_node_set_rotation(node, rotations[spaceship->direction]); | 159 const asc_vec2f movement = asc_vec2f_scale(dvec, speed); |
| 160 if (spaceship->direction == spaceship->target_direction) { | |
| 161 // no change of direction - keep moving | |
| 162 asc_scene_node_move2f(node, movement); | |
| 163 } else { | |
| 164 // identify the tile we are currently in | |
| 165 int x = (int) (node->position.x / ts); | |
| 166 int y = (int) (node->position.y / ts); | |
| 167 const asc_vec2f tcenter = ASC_VEC2F(x*ts, y*ts); | |
| 168 // calculate the (squared) distance to the tile's center | |
| 169 float cdist = asc_vec2f_sqrlen(asc_vec2f_sub(tcenter, ASC_VEC2F(node->position.x, node->position.y))); | |
| 170 // if it is less than squared length of the movement vector, snap to the center and rotate | |
| 171 // TODO: think about if we should allow changing direction only when we haven't passed the center yet | |
| 172 if (cdist < asc_vec2f_sqrlen(dvec)) { | |
| 173 asc_scene_node_set_position2f(node, tcenter); | |
| 174 spaceship->direction = spaceship->target_direction; | |
| 175 asc_scene_node_set_rotation(node, rotations[spaceship->direction]); | |
| 176 // TODO: this is losing some speed - improve the calculation and add partial movement after rotation | |
| 177 } else { | |
| 178 // too far away from center, continue normal movement | |
| 179 asc_scene_node_move2f(node, movement); | |
| 180 } | |
| 181 } | |
| 159 } | 182 } |
| 160 | 183 |
| 161 static Spaceship *create_spaceship(void) { | 184 static Spaceship *create_spaceship(void) { |
| 162 AscSceneNode *sprite = asc_sprite( | 185 AscSceneNode *sprite = asc_sprite( |
| 163 .name = "Player", | 186 .name = "Player", |
| 283 } | 306 } |
| 284 | 307 |
| 285 // player rotation | 308 // player rotation |
| 286 if (asc_key_pressed(ASC_KEY(LEFT))) { | 309 if (asc_key_pressed(ASC_KEY(LEFT))) { |
| 287 if (spaceship->direction != MOVE_RIGHT) { | 310 if (spaceship->direction != MOVE_RIGHT) { |
| 288 spaceship->direction = MOVE_LEFT; | 311 spaceship->target_direction = MOVE_LEFT; |
| 289 } | 312 } |
| 290 } | 313 } |
| 291 if (asc_key_pressed(ASC_KEY(RIGHT))) { | 314 if (asc_key_pressed(ASC_KEY(RIGHT))) { |
| 292 if (spaceship->direction != MOVE_LEFT) { | 315 if (spaceship->direction != MOVE_LEFT) { |
| 293 spaceship->direction = MOVE_RIGHT; | 316 spaceship->target_direction = MOVE_RIGHT; |
| 294 } | 317 } |
| 295 } | 318 } |
| 296 if (asc_key_pressed(ASC_KEY(UP))) { | 319 if (asc_key_pressed(ASC_KEY(UP))) { |
| 297 if (spaceship->direction != MOVE_DOWN) { | 320 if (spaceship->direction != MOVE_DOWN) { |
| 298 spaceship->direction = MOVE_UP; | 321 spaceship->target_direction = MOVE_UP; |
| 299 } | 322 } |
| 300 } | 323 } |
| 301 if (asc_key_pressed(ASC_KEY(DOWN))) { | 324 if (asc_key_pressed(ASC_KEY(DOWN))) { |
| 302 if (spaceship->direction != MOVE_UP) { | 325 if (spaceship->direction != MOVE_UP) { |
| 303 spaceship->direction = MOVE_DOWN; | 326 spaceship->target_direction = MOVE_DOWN; |
| 304 } | 327 } |
| 305 } | 328 } |
| 306 | 329 |
| 307 // debug-key for clearing the shader registry | 330 // debug-key for clearing the shader registry |
| 308 if (asc_key_pressed(ASC_KEY(S))) { | 331 if (asc_key_pressed(ASC_KEY(S))) { |
