moveLeftdeltaX

moveLeftdeltaX is a variable or function name used in programming to represent the horizontal movement delta on the X axis when moving in the leftward direction. In many input and animation systems, deltaX denotes the change in horizontal position since the last update. moveLeftdeltaX isolates the portion of that change that corresponds to leftward movement, often aligning with common coordinate conventions where leftward movement yields a negative deltaX in screen coordinates or a positive magnitude when treated as a non-negative value.

The term is commonly contrasted with moveRightdeltaX, which captures the rightward delta. Depending on the codebase and coordinate system, moveLeftdeltaX may store a negative value (to reflect direction) or a non-negative magnitude of leftward movement. This distinction affects how the value is applied to motion, velocity, or animation states.

Typical usage involves integrating moveLeftdeltaX into an update loop or physics step. A common pattern is to calculate a raw deltaX from input devices (keyboard, gamepad, or pointer movement) and then derive moveLeftdeltaX by either taking the negative of a rightward delta, clamping to zero when movement is not leftward, or normalizing to a leftward velocity. This variable can be used to drive character movement, camera panning, or UI navigation that requires leftward input.

Variations of the name exist, such as leftDeltaX or deltaXLeft, depending on coding standards. See also deltaX, input handling, and coordinate system conventions.