96 lines
3.1 KiB
ReStructuredText
96 lines
3.1 KiB
ReStructuredText
Architecture
|
|
------------
|
|
|
|
Boxes.py it structured into several distinct tiers.
|
|
|
|
User Interfaces
|
|
...............
|
|
|
|
User interfaces allow users to render the different generators. They
|
|
handle the parameters of Generators and convert them to a readable
|
|
form. The user interfaces are located in `scripts/`. Currently there is
|
|
|
|
* scripts/boxes -- the command line interface
|
|
* scripts/boxesserver -- the web interface
|
|
* scripts/boxes2inx -- generates Inkscape extensions
|
|
* scripts/boxes_example.ipynb -- Jupyter notebook
|
|
|
|
|
|
Generators
|
|
..........
|
|
|
|
A (box) generator is an sub class of boxes.Boxes. It generates one
|
|
drawing. The sub classes over load .__init__() to set their parameters
|
|
and implement .render() that does the actual drawing.
|
|
|
|
Generators are found in ``boxes/generators/``. They are included into
|
|
the web UI and the CLI tool by the name of their class. So whenever
|
|
you copy either an existing generator or the sceleton in
|
|
``boxes/generators/_template.py`` you need to change the name of the
|
|
main class first.
|
|
|
|
Parts
|
|
.....
|
|
|
|
Parts are a single call that draws something according to a set of parameters.
|
|
There is a number of standard parts. Their typical params are
|
|
explained in the API docs.
|
|
|
|
Only real requirement for a part it supporting the move parameter for
|
|
placement.
|
|
|
|
Part Callbacks
|
|
++++++++++++++
|
|
|
|
Most parts support callbacks - either one in the middle for round
|
|
parts or one for each edge. They allow placing holes or other features
|
|
on the part.
|
|
|
|
Navigation and Turtle Graphics
|
|
..............................
|
|
|
|
Many drawing commands in Boxes.py are Turtle Graphics commands. They
|
|
start at the current position and in the current direction and move
|
|
the coordinate system with them. This way the absolute coordinates are
|
|
never used and placement and movement is always relative to the
|
|
current position.
|
|
|
|
There are a few functions to move the origin to a convenient position
|
|
or to return to a previously saved position.
|
|
|
|
Edges
|
|
.....
|
|
|
|
Edges are turtle graphic commands. But they have been elevated to
|
|
proper Classes to handle outsets. They can be passed as parameters to parts.
|
|
There is a set of standard edges found in ``.edges``. They are
|
|
acciociated with a single char which can be used instead of the
|
|
Edge object itself at most places. This allows passing the edge
|
|
description of a part as a string.
|
|
|
|
Turtle graphics
|
|
...............
|
|
|
|
There are a few turtle graphics commands that do the actual
|
|
drawing. Corners with an positive angle (going counter clockwise)
|
|
close the part while negative angles (going clockwise) create protrusions.
|
|
This is inversed for holes which need to be drawn clockwise.
|
|
|
|
Getting this directions right is important to make the burn correction
|
|
(aka kerf) work properly.
|
|
|
|
Simple drawing commands
|
|
.......................
|
|
|
|
These also are simple drawing commands. Some of them get ``x``, ``y`` and
|
|
``angle`` parameters to draw somewhere specific. Some just draw right
|
|
at the current coordinate origin. Often these commands create holes or
|
|
hole patterns.
|
|
|
|
Cairo
|
|
.....
|
|
|
|
Boxes.py uses cairo as graphics library. It is not fully encapsulated
|
|
within the drawing methods of the Boxes class. Although this is the
|
|
long term goal. Boxes.ctx is the cairo context all drawing is made on.
|