Merge pull request #44 from UnavailableDev/game-engine

Game engine

1 files changed, 81 insertions, 0 deletions

diff --git a/src/engine/entity.c b/src/engine/entity.c
index 153e7e1..535759d 100644
--- a/src/engine/entity.c
+++ b/src/engine/entity.c
@@ -43,4 +43,85 @@ void hh_solve_collision(vec2 pos_environment, hh_entity* entity){
 	// 	entity->vel.x = 0;
 	// } 
 }
+hh_entity hh_background_collision (hh_entity temp_old_entity,hh_entity temp_new_entity){
 
+		temp_old_entity.is_grounded = false;
+ 
+// solves x collision
+	if (temp_old_entity.vel.x <= 0) {
+		if (hh_colidable(hh_world_to_tile((vec2){.x=temp_new_entity.pos.x + 0, .y=temp_old_entity.pos.y + 0})) || 
+			hh_colidable(hh_world_to_tile((vec2){.x=temp_new_entity.pos.x + 0, .y=temp_old_entity.pos.y + 15}))) {
+			temp_new_entity.pos.x = (temp_new_entity.pos.x & ~15) + 16,
+			temp_new_entity.vel.x = 0;
+		}
+	} else {
+		if (hh_colidable(hh_world_to_tile((vec2){.x=temp_new_entity.pos.x + 16, .y=temp_old_entity.pos.y + 0})) || 
+			hh_colidable(hh_world_to_tile((vec2){.x=temp_new_entity.pos.x + 16, .y=temp_old_entity.pos.y + 15}))) {
+			temp_new_entity.pos.x = temp_new_entity.pos.x & ~15, // <-- magic comma, NOT TOUCHY
+			temp_new_entity.vel.x = 0;
+		}
+	}
+
+	//solves y collision
+	if (temp_old_entity.vel.y <= 0) {
+		if (hh_colidable(hh_world_to_tile((vec2){.x=temp_new_entity.pos.x + 0, .y=temp_new_entity.pos.y + 0})) || 
+			hh_colidable(hh_world_to_tile((vec2){.x=temp_new_entity.pos.x + 15, .y=temp_new_entity.pos.y + 0}))) {
+			temp_new_entity.pos.y = (temp_new_entity.pos.y & ~15) + 16,
+			temp_new_entity.vel.y = 0;
+		}
+	} else {
+		if (hh_colidable(hh_world_to_tile((vec2){.x=temp_new_entity.pos.x + 0, .y=temp_new_entity.pos.y + 15})) || 
+			hh_colidable(hh_world_to_tile((vec2){.x=temp_new_entity.pos.x + 15, .y=temp_new_entity.pos.y + 15}))) {
+			temp_new_entity.pos.y = temp_new_entity.pos.y & ~15,
+			temp_new_entity.vel.y = 0;
+			temp_old_entity.is_grounded = true;
+		}
+	}
+	temp_old_entity.pos = temp_new_entity.pos; 
+	temp_old_entity.vel = temp_new_entity.vel;
+	return temp_old_entity;
+}
+
+hh_entity hh_enemy_collision(hh_entity temp_player, hh_entity temp_enemy){
+	
+	bool collide = hh_distance_circles( temp_player.pos,  temp_enemy.pos, temp_player.radius, temp_enemy.radius);
+
+	if (collide == true && temp_player.is_hit == false)
+	{
+		temp_player.is_hit = true;
+		//angle = atan2( tempEntity.pos_y - tempPlayer.pos_y, tempEntity.pos_x - tempPlayer.pos_x);
+		if(temp_player.pos.x <= temp_enemy.pos.x) //player left of enemy -- creates flinch movement L or R
+		{
+		//	printf("BONK-left!/n");
+			temp_player.vel.y = -5;
+			temp_player.vel.x = -8;
+		}	else {
+		//	printf("BONK-right!/n");
+			temp_player.vel.y = -5;
+			temp_player.vel.x = 8;
+		}
+		// ghost mode / invulnerable or other things on hit
+		//	temp_player.hp--;
+			
+	} else {
+		temp_player.is_hit = false;
+		
+	}
+
+
+return temp_player;
+}
+
+
+bool hh_distance_circles (vec2 object_1, vec2 object_2, int radius_1, int radius_2){
+	int a_squared = (object_1.x - object_2.x) * (object_1.x - object_2.x);
+	int b_squared = (object_1.y - object_2.y) * (object_1.y - object_2.y);
+	int c_squared = a_squared + b_squared; 
+	int radius = ( radius_1 + radius_2) * ( radius_1 + radius_2 );
+
+		if( c_squared <= radius ){
+			return true;
+		} else {
+			return false;
+		}
+}