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analog stick
An analog stick, sometimes called a control stick, joy stick or thumbstick, is an input device for a controller (often a game controller) that is used for three-dimensional input. An analog stick is a variation of a joystick, consisting of a protrusion from the controller; input is based on the position of this protrusion in relation to the default "center" position. While digital sticks rely on single electrical connections for movement (using internal digital electrical contacts for up, down, left and right), analog sticks use continuous electrical activity running through potentiometers. The analog stick has greatly overtaken the D-pad in both prominence and usage in console video games.
==Usage in video games==
In a video game, an analog stick is often used to move some game object, usually the protagonist. It may also be used to rotate the camera, usually around the protagonist. The analog stick can serve a great variety of other functions, depending on the game. Today many analog sticks can also be pushed like other buttons on a controller.
Its use is prevalent in 3D games, where more than 8 directions are needed (which is all that was offered on the d-pad). Using a D-pad in a 3D game greatly limits the ability to move. For example, in a 3D platform game like Super Mario 64, using a D-pad would allow Mario to move forward, left, and forward-left, but nothing in between. Some early 3D games such as Resident Evil overcame this limitation by assigning the Left and Right directions on the D-pad to spin the character instead of making the character move in that direction. This however created its own problems as the character was unable to move while spinning, requiring the player to stand in the same spot while changing direction. With the prevalence of analog sticks, the aforementioned limitations of the D-pad ceased to be an issue.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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