# Using Numworks' modules `kandinsky`, `ion` and `time` with PythonExtra
PythonExtra offers the possibility of using certain Numworks modules in order to make the scripts of this machine compatible as is on Casio fx-CG50 (no support on the fx9860G due to insufficient memory and lack of color screen ).
This is a Work in Progress (WIP) and the support is subject to extensive testing at this stage. The port concerns the Numworks `kandinsky`, `ion` and `time` modules which are machine specific and are now supported via this implementation. The `math`, `cmath`, `random` modules being identical between the `Numworks` version and the `builtins` modules of MicroPython, they are therefore not part of this implementation but are perfectly usable without modification in the scripts.
Note: the `turtle` and `matplotlib.pyplot` modules are not included in this implementation. It is possible to use the `turtle`, `matplotlib` and `casioplot` modules from Casio Education which are perfectly functional and provided as an example in `ports/sh/examples`.
## `kandinsky`
The `kandinsky` module provides support for graphics primitives via high-performance `gint` routines. All the functions of this module are available:
-`color(r,g,b)`: Generates the value of the color r,g,b. You can also simply use a tuple to define a color: (r,g,b).
-`get_pixel(x,y)`: Returns the color of the pixel at x,y coordinates as a tuple (r,g,b).
-`set_pixel(x,y,color)`: Lights the pixel x,y of the color color.
-`draw_string(text,x,y,[color1],[color2])`: Displays the text at x,y coordinates. The arguments color1 (text color) and color2 (text background color) are optional.
-`fill_rect(x,y,width,height,color)`: Fills a rectangle of width width and height height with the color color at the point of x and y coordinates.
The module also offers a certain number of colors explicitly named and accessible by a character string. The following values can be used instead of the color parameters of the `kandinsky` functions:
- "red", "r"
- "green", "g"
- "blue", "b"
- "black", "k"
- "white", "w"
- "yellow", "y"
- "pink"
- "magenta"
- "grey", "gray"
- "purple"
- "orange"
- "cyan"
- "brown"
The following functions are additions to take advantage of the wide screen of the fxCG and are therefore an extension of the `Kandinsky` module. They are therefore by definition not compatible with Python Numwork. These functions can be recognized by their names which all begin with `CGEXT_`:
-`CGEXT_Enable_Wide_Screen()`: Enables the fxCG wide screen, no settings are necessary. The x-coordinates of the physical screen can be negative to encroach on the left white stripe and greater than 319 pixels to encroach on the right white stripe;
-`CGEXT_Disable_Wide_Screen()`: Cancels the activation of the fxCG extended screen, no settings are necessary. The x coordinates of the physical screen will be constrained between 0 and 320 pixels. Beyond that, the route will not be carried out.
-`CGEXT_Is_Wide_Screen_Enabled()`: Returns `True` if the extended screen is active and `False` otherwise.
Note 1: after having made a plot in the extended area, it must be active to allow its deletion (typically via a call to the `fill_rect()` function with the appropriate parameters).
Note 2: In non-extended mode (by default when initializing the `Kandinsky` module) the screen coordinates go from (0,0) to (319,221) centered on the fxCG screen. In extended mode, the screen coordinates range from (-38,-1) to (358,223).
## `ion`
The `ion` module gives access to the `keydown(k)` function which returns True if the key k placed as an argument is pressed and False otherwise.
The “conversion” of the keys between the Numworks machine and Casio fxCG50 is done according to the following mapping:
