Platform Engine

{
    if ( place_meeting( x , y + 1 , objBlock ) == false )
    {
        grav = grav + 0.1;
        if ( grav > 5 )
        {
            grav = 5;
        }
        vsp = vsp + grav;
    }
    else
    {
        grav = 0;
        vsp = 0;
    }
    hsp = keyboard_check( vk_right ) * 4 - keyboard_check( vk_left ) * 4;
    move_contact_all( point_direction( x , y , x + hsp , y ) , abs( hsp ) );
    move_contact_all( point_direction( x , y , x , y + vsp ) , abs( vsp ) );
}