on right click:
    set {_loc2} to location of the block 20 meter infront of player's head
    set {_location} to player's location
    set {_x} to x coord of {_location}
    set {_y} to (y coord of {_location})+1.7
    set {_z} to z coord of {_location}
    set {_loc1} to location {_x}, {_y}, {_z} in world of player
    drawLine particle redstone, RGB 40, 200, 255, center {_loc1}, target {_loc2}, id "%player%", visibleRange 20
    wait 50 ticks
    stopEffect id "%player%"