C++ Collision::GetSegment方法代码示例

//.........这里部分代码省略.........
      // Get the delta time //
      float deltaTime = FpsCounter::GetDeltaTime();
		//printf( "Currentfps - %f\n", FpsCounter::GetFps());
      // Move the bitmap with the arrow keys //
		Vec2D force;

      if( key[KEY_LEFT] ) force.x -= 1;
      if( key[KEY_RIGHT] ) force.x += 1;
      if( key[KEY_UP] ) force.y -= 1;
      if( key[KEY_DOWN] ) force.y += 1;

      if( force.x && force.y )
			force *= .7071;

		force *= THRUST;

		Vec2D accel = force / player.mass;
		accel.y += GRAVITY;

		//printf( "Force is %f,%f\n", force.x, force.y );
		//printf( "Accel is %f,%f\n", accel.x, accel.y );
		//printf( "DT is %f\n", deltaTime );

		//printf( "PreVelocity is %+07.3f,%+07.3f\n", player.velocity.x, player.velocity.y );
		player.velocity += accel*deltaTime;
		//printf( "Velocity is    %+07.3f,%+07.3f\n", player.velocity.x, player.velocity.y );
		player.UpdatePosition( deltaTime );



		//accel.x = FRand( -.1, .1 );
		//accel.y = FRand( -.1, .1 );
		accel.x = 0.0;
		accel.y = GRAVITY;
		enemy.velocity += accel * deltaTime;
		enemy.UpdatePosition( deltaTime );


		collision = player.GetCollision( wall, player.GetPlacement(), wall.GetPlacement());
		if( collision.IsCollision())
		{
			Vec2D surfaceNormal = collision.GetSegment( OBJ_B ).GetNormal();
			float speedAgainstSurface = -player.velocity * surfaceNormal;
			player.velocity += 2 * speedAgainstSurface * surfaceNormal;
		}


		collision = enemy.GetCollision( wall, enemy.GetPlacement(), wall.GetPlacement());
		if( collision.IsCollision())
		{
			Vec2D surfaceNormal = collision.GetSegment( OBJ_B ).GetNormal();
			float speedAgainstSurface = -enemy.velocity * surfaceNormal;
			enemy.velocity += 2 * speedAgainstSurface * surfaceNormal;
		}


		collision = player.GetCollision( enemy, player.GetPlacement(), enemy.GetPlacement());
		if( collision.IsCollision())
		{
			Vec2D pp = player.velocity * player.mass;
			Vec2D ep = enemy.velocity * enemy.mass;
			Vec2D vcm = (pp + ep) / (player.mass + enemy.mass );

			Vec2D pvf = -( player.velocity - vcm ) + vcm;
			Vec2D evf = -( enemy.velocity - vcm ) + vcm;

			player.velocity = pvf;
			enemy.velocity = evf;

		}

		if( goal.Contains( player ))
		{
			allegro_message( "You went into the firey goal of death!  You lose!" );
			bExit = true;
		}
		if( goal.Contains( enemy ))
		{
			allegro_message( "You got the enemy into the firey goal of death!  Congrats, you win!" );
			bExit = true;
		}


      // RENDERING //

      // Clear the screen to white //
      Canvas::Fill( Rgba::BLACK );

      // Draw the bitmap to the screen with the top-left coordinates //
		player.Draw();
		enemy.Draw();
		Transforms::SetPosition( 0,0 );
		goal.DrawOutline( Rgba::RED );

      // Refresh the screen contents to show this frame //
      Canvas::Refresh();
      rest(0);
   }
   return 0;
}