10. API - Screen¶
The screen interface is by far the most extensive and complex part of the
pisense library, comprising several classes and numerous functions to handle
representing the screen in a variety of conveniently manipulated formats, and
generation of slick animations. The two most important elements are the main
SenseScreen class itself, and the ScreenArray class which is
used to represent the contents of the display.
10.1. SenseScreen¶
10.2. Animation functions¶
The following animation generator functions are used internally by the
animation methods of SenseScreen. They are also provided as separate
generator functions to permit users to build up complex sequences of
animations, or to aid in generating other effects like interspersing frames
with other sequences.
Each function is a generator function which yields an Image
for each frame of the animation.
10.3. Easing functions¶
The easing functions are used with the animation functions above for their easing parameters.
An easing function must take a single integer parameter indicating the number of frames in the resulting animation. It must return a sequence of (or generator which yields) floating point values between 0.0 (which indicates the start of the animation) and 1.0 (which indicates the end of the animation). How fast the value moves from 0.0 to 1.0 dictates how fast the animation progresses from frame to frame.
Several typical easing functions are provided by the library, but you are free to use any function which complies which this interface. The default easing function is always linear:
10.4. Gamma tables¶
Two built-in gamma tables are provided which can be assigned to
SenseScreen.gamma. However, you are free to use any compatible list of
32 values.
-
pisense.DEFAULT_GAMMA¶ The default gamma table, which can be assigned directly to
gamma. The default rises in a steady curve from 0 (off) to 31 (full brightness).
-
pisense.LOW_GAMMA¶ The “low light” gamma table, which can be assigned directly to
gamma. The low light table rises in a steady curve from 0 (off) to 10.