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plugins: snake: simplification in direction calculation (#1361)

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Co-authored-by: hedger <hedger@users.noreply.github.com>
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Roman Shchekin 2022-07-04 20:49:23 +03:00 committed by GitHub
parent 43fd2e4433
commit 05b7b7f2db
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 5 additions and 38 deletions
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43
applications/snake_game/snake_game.c
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@ -29,6 +29,8 @@ typedef enum {
GameStateGameOver, GameStateGameOver,
} GameState; } GameState;
// Note: do not change without purpose. Current values are used in smart
// orthogonality calculation in `snake_game_get_turn_snake`.
typedef enum { typedef enum {
DirectionUp, DirectionUp,
DirectionRight, DirectionRight,
@ -195,44 +197,9 @@ static bool
} }
static Direction snake_game_get_turn_snake(SnakeState const* const snake_state) { static Direction snake_game_get_turn_snake(SnakeState const* const snake_state) {
switch(snake_state->currentMovement) { // Sum of two `Direction` lies between 0 and 6, odd values indicate orthogonality.
case DirectionUp: bool is_orthogonal = (snake_state->currentMovement + snake_state->nextMovement) % 2 == 1;
switch(snake_state->nextMovement) { return is_orthogonal ? snake_state->nextMovement : snake_state->currentMovement;
case DirectionRight:
return DirectionRight;
case DirectionLeft:
return DirectionLeft;
default:
return snake_state->currentMovement;
}
case DirectionRight:
switch(snake_state->nextMovement) {
case DirectionUp:
return DirectionUp;
case DirectionDown:
return DirectionDown;
default:
return snake_state->currentMovement;
}
case DirectionDown:
switch(snake_state->nextMovement) {
case DirectionRight:
return DirectionRight;
case DirectionLeft:
return DirectionLeft;
default:
return snake_state->currentMovement;
}
default: // case DirectionLeft:
switch(snake_state->nextMovement) {
case DirectionUp:
return DirectionUp;
case DirectionDown:
return DirectionDown;
default:
return snake_state->currentMovement;
}
}
} }
static Point snake_game_get_next_step(SnakeState const* const snake_state) { static Point snake_game_get_next_step(SnakeState const* const snake_state) {