plugins: snake: simplification in direction calculation (#1361)
Co-authored-by: hedger <hedger@users.noreply.github.com>
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@ -29,6 +29,8 @@ typedef enum {
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GameStateGameOver,
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} GameState;
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// Note: do not change without purpose. Current values are used in smart
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// orthogonality calculation in `snake_game_get_turn_snake`.
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typedef enum {
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DirectionUp,
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DirectionRight,
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@ -195,44 +197,9 @@ static bool
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}
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static Direction snake_game_get_turn_snake(SnakeState const* const snake_state) {
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switch(snake_state->currentMovement) {
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case DirectionUp:
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switch(snake_state->nextMovement) {
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case DirectionRight:
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return DirectionRight;
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case DirectionLeft:
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return DirectionLeft;
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default:
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return snake_state->currentMovement;
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}
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case DirectionRight:
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switch(snake_state->nextMovement) {
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case DirectionUp:
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return DirectionUp;
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case DirectionDown:
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return DirectionDown;
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default:
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return snake_state->currentMovement;
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}
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case DirectionDown:
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switch(snake_state->nextMovement) {
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case DirectionRight:
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return DirectionRight;
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case DirectionLeft:
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return DirectionLeft;
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default:
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return snake_state->currentMovement;
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}
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default: // case DirectionLeft:
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switch(snake_state->nextMovement) {
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case DirectionUp:
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return DirectionUp;
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case DirectionDown:
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return DirectionDown;
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default:
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return snake_state->currentMovement;
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}
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}
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// Sum of two `Direction` lies between 0 and 6, odd values indicate orthogonality.
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bool is_orthogonal = (snake_state->currentMovement + snake_state->nextMovement) % 2 == 1;
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return is_orthogonal ? snake_state->nextMovement : snake_state->currentMovement;
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}
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static Point snake_game_get_next_step(SnakeState const* const snake_state) {
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