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+# PicoVector <!-- omit in toc -->
+
+PicoVector is an anti-aliased vector graphics implementation built on top of PicoGraphics.
+
+PicoVector implements bindings for [Pretty Poly](https://github.com/lowfatcode/pretty-poly) and [Alright Fonts](https://github.com/lowfatcode/alright-fonts). Providing a MicroPython interface
+for building polygons and shapes, handling transformations and rendering text.
+
+While PicoGraphics supports basic primitives like rectangles and circles, PicoVector
+goes much further: allowing for arbitrary shapes with cut-outs for representing
+anything from a rounded rectangle to a complex icon. Bouncing DVD logo, anyone?
+
+- [Quick Start](#quick-start)
+  - [Drawing Something](#drawing-something)
+  - [Transforms](#transforms)
+    - [A Note About Rotation](#a-note-about-rotation)
+- [In Depth](#in-depth)
+  - [Anti-aliasing Options](#anti-aliasing-options)
+  - [Text, Fonts and Text Metrics](#text-fonts-and-text-metrics)
+    - [Converting](#converting)
+    - [Loading \& Configuring](#loading--configuring)
+    - [Spacing \& Alignment](#spacing--alignment)
+    - [Measuring Text](#measuring-text)
+    - [Drawing Text](#drawing-text)
+  - [Polygons](#polygons)
+    - [Rectangle](#rectangle)
+    - [Regular](#regular)
+    - [Circle](#circle)
+    - [Arc](#arc)
+    - [Star](#star)
+    - [Line](#line)
+    - [Path](#path)
+  - [Transformations](#transformations)
+    - [T'is A-fine Day For Transformin'](#tis-a-fine-day-for-transformin)
+    - [Translate](#translate)
+    - [Rotate](#rotate)
+    - [Scale](#scale)
+    - [Custom](#custom)
+
+
+## Quick Start
+
+PicoVector wraps PicoGraphics and uses its existing pixel pushing powers to provide
+pretty polygons. As such, it's super simple to set up:
+
+```python
+from picographics import PicoGraphics, YOUR_DISPLAY_TYPE
+from picovector import PicoVector
+
+graphics = PicoGraphics(YOUR_DISPLAY_TYPE)
+vector = PicoVector(graphics)
+```
+
+### Drawing Something
+
+The essential drawing primitive for PicoVector is the Polygon.
+
+Getting your head round Polygons might be a little more complex. PicoVector uses
+"Polygon" to mean a collection of one or more polygonal shapes, with subsequent
+shapes either punching out or filling in areas in an "exclusive or" fashion.
+
+For example, three concentric circles added into a "Polygon" will create an outer
+donut shape from the first two circles, with the third circle appearing inside.
+
+eg:
+
+```python
+from picovector import Polygon
+
+bullseye = Polygon()
+bullseye.circle(120, 120, 100)
+bullseye.circle(120, 120, 70)
+bullseye.circle(120, 120, 30)
+
+vector.draw(bullseye)
+```
+
+### Transforms
+
+Since PicoVector deals in Polygons, which are collections of immutable shapes,
+we need some other way move them around, scale them or rotate them.
+
+Enter Transforms:
+
+```python
+from picovector import Polygon, Transform
+
+bullseye = Polygon()
+bullseye.circle(120, 120, 100)
+bullseye.circle(120, 120, 70)
+bullseye.circle(120, 120, 30)
+
+vector.set_transform(Transform().translate(100, 0))
+
+vector.draw(bullseye)
+```
+
+![Three concentric circles forming a bullseye pattern.](polygon-bullseye.png)
+
+A Transform is actually a 2d transformation matrix with some convenience
+functions for producing common, practical transformations.
+
+Transformation matrices are weird, and you'll find you need to reverse your
+steps to get the expected results.
+
+For example, say we want to draw a diamond in the middle of our 240x240 pixel
+screen.
+
+Since we want to move a square to the middle of the screen, and then rotate it
+we might be tempted to do:
+
+```python
+vector.set_transform(Transform().translate(95, 95).rotate(45, (120, 120)))
+vector.draw(Polygon().rectangle(0, 0, 50, 50))
+```
+
+Move, and then rotate. That shoul... woah why is the diamond over there!??
+
+![A black square with a white diamond off to one side](transform-operations-reversed.png)
+
+To understand why this doesn't work, removing the `translate()` step:
+
+```python
+vector.set_transform(Transform().rotate(45, (120, 120)))
+vector.draw(Polygon().rectangle(0, 0, 50, 50))
+```
+
+puts our diamond at the top of the screen, since we have rotated our 50x50
+pixel square 45 degrees around the center of the screen. It's easy to see why
+translating that by `95, 95` then puts it off to the right.
+
+![A black square with a white diamond in the top middle.](transform-only-rotate.png)
+
+The right way is to add the `translate()` last so that it happens first...
+this is counter-intuitive but you'll get the hang of it after a few mishaps!
+
+```python
+vector.set_transform(Transform().rotate(45, (120, 120)).translate(95, 95))
+vector.draw(Polygon().rectangle(0, 0, 50, 50))
+```
+
+![A black square with a white diamond, perfectly centered.](transform-operations-corrected.png)
+
+Perfect!
+
+It's worth reiterating that the same rectangle is used in all the above examples,
+a plain ol' 50x50 pixel square in the top left corner of the screen. We translate
+by `95, 95` because this is the screen dimension (240x240) divided by two, minus
+the square size (50x50) divided by two.
+
+Another equally valid but slightly tricky approach would be to use a square like
+this:
+
+```
+Polygon().rectangle(-25, -25, 50, 50)
+```
+
+It's the same square, sort of, except it is centered on `0, 0`.
+
+#### A Note About Rotation
+
+To make rotation a little less confusing, the `rotate()` transform method requires
+an origin, that's the tuple given as the second argument. It's an X, Y coordinate
+that describes the point around which the rotation should happen.
+
+Rotation then performs three transformations- a translation to shift to your supplied
+origin, a rotation and a final translation back to its original location.
+
+You can supply `None` if you do not want this behaviour and like to live dangerously.
+
+## In Depth
+
+### Anti-aliasing Options
+
+Behind the scenes all of PicoVector's drawing is done by PicoGraphics- by
+setting pixels. Unlike just directly drawing shapes with pixels PicoVector
+includes anti-aliasing, a smoothing technique that turns diagonal lines
+into the crisp, blended edges we'd expect from computers today.
+
+Available options are:
+
+* `ANTIALIAS_NONE` - turns off anti-aliasing for best performance
+* `ANTIALIAS_FAST` - 4x anti-aliasing, a good balance between speed & quality
+* `ANTIALIAS_BEST` - 16x anti-aliasing, best quality at the expense of speed
+
+### Text, Fonts and Text Metrics
+
+
+Under the hood PicoVector uses [Alright Fonts](https://github.com/lowfatcode/alright-fonts)
+a font-format for embedded and low resource platforms.
+
+Alright Fonts supports converting TTF and OTF fonts into .af format which can
+then be displayed using PicoVector. Most of your favourite fonts should work -
+including silly fonts like [Jokerman](https://en.wikipedia.org/wiki/Jokerman_(typeface)) -
+but there are some limitations to their complexity.
+
+#### Converting
+
+Converting from an OTF or TTF font is done with the `afinate` utility. It's a 
+Python script that handles decomposing the font into a simple list of points.
+
+Right now you'll need the `port-to-c17` branch:
+
+```
+git clone https://github.com/lowfatcode/alright-fonts --branch port-to-c17
+```
+
+And you'll need to set up/activate a virtual env and install some dependencies:
+
+```
+cd alright-fonts
+python3 -m venv .venv
+source .venv/bin/activate
+pip install freetype.py simplification
+```
+
+And, finally, convert a font with `afinate`:
+
+```
+./afinate --font jokerman.ttf --quality medium jokerman.af
+```
+
+This will output two things- a wall of text detailing which characters have
+been converted and how many points/contours they consist of, and the font
+file itself. You'll then need to upload the font to your board, this could
+be via the file explorer in Thonny or your preferred method.
+
+#### Loading & Configuring
+
+```python
+vector.set_font("jokerman.af", 24)
+```
+
+#### Spacing & Alignment
+
+* `set_font_size()` 
+* `set_font_word_spacing()`
+* `set_font_letter_spacing()`
+* `set_font_line_height()`
+* `set_font_align()`
+
+#### Measuring Text
+
+* `x, y, w, h = measure_text(text, x=0, y=0, angle=None)`
+
+Returns a four tuple with the x, y position, width and height in pixels.
+
+#### Drawing Text
+
+* `text(text, x, y, angle=None, max_width=0, max_height=0)`
+
+When you draw text the x, y position and angle are used to create a new
+Transform to control the position and rotation of your text. The transform
+set with `.set_transform()` is also applied.
+
+### Polygons
+
+The basis of all drawing operations in PicoVector is the `Polygon` object.
+
+A `Polygon` is a collection of one or more paths to be drawn together. This
+allows for shapes with holes - letters, for example - or more complicated
+designs - logos or icons - to be scaled, rotated and drawn at once.
+
+If paths overlap then the top-most path will "punch" out the one underneath.
+
+To use any of the primitives or path drawing methods you must first create
+a `Polygon`, for example here's a simple triangle:
+
+```python
+from picovector import Polygon
+my_shape = Polygon()
+my_shape.path((10, 0), (0, 10), (20, 10))
+```
+
+#### Rectangle
+
+```python
+Polygon().rectangle(x, y, w, h, [corners=(tl, tr, bl, br)])
+```
+
+A rectangle is a plain old rectangular shape with optional rounded corners.
+
+If `stroke` is greater than zero then the rectangle outline will be produced.
+
+If any of the corner radii are greater than zero then that corner will be created.
+
+#### Regular
+
+```python
+Polygon().regular(x, y, radius, sides, [stroke])
+```
+
+Creates a regular polygon with the given radius and number of sides. Needs at
+least 3 sides (an equilateral triangle) and converges on a circle.
+
+If `stroke` is greater than zero then the regular polygon outline will be created.
+
+#### Circle
+
+```python
+Polygon().regular(x, y, radius, [stroke])
+```
+
+Effectively a regular polygon, approximates a circle by automatically picking
+a number of sides that will look smooth for a given radius.
+
+If `stroke` is greater than zero then the circle outline will be created.
+
+#### Arc
+
+```python
+Polygon().arc(x, y, radius, from, to, [stroke])
+```
+
+Create an arc at x, y with radius, from and to angle (degrees).
+
+Great for radial graphs.
+
+If `stroke` is greater than zero then the arc outline will be created.
+
+#### Star
+
+```python
+Polygon().star(x, y, points, inner_radius, outer_radius, [stroke])
+```
+
+Create a star at x, y with given number of points.
+
+The inner and outer radius (in pixels) define where the points start and end.
+
+If `stroke` is greater than zero then the arc outline will be created.
+
+#### Line
+
+```python
+Polygon().line(x, y, x2, y2, thickness)
+```
+
+#### Path
+
+```python
+Polygon().path((x, y), (x2, y2), (x3, y3), ...)
+```
+
+A path is simply an arbitrary list of points that produce a complete closed
+shape. It's ideal for drawing complex shapes such as logos or icons.
+
+If you have a list of points you can use Python's spread operator to pass it
+into `path`, eg:
+
+```python
+my_points = [(10, 0), (0, 10), (20, 10)]
+my_shape = Polygon()
+my_shape.path(*my_points)
+```
+
+### Transformations
+
+To create a new empty `Transform()` you can just:
+
+```python
+my_transform = Transform()
+```
+
+And tell PicoVector it's the one you want to use with:
+
+```python
+vector.set_transform(my_transform)
+```
+
+#### T'is A-fine Day For Transformin'
+
+Since PicoVector supports only 2D transformation matrices you can only perform
+translations which are "affine." The simplest way to think about the limitations
+of an affine transformation is to understand that parallel lines will remain
+parallel.
+
+You can, for example, rotate a square into a diamond since its two pairs of
+parallel sides will remain parallel.
+
+You cannot skew a square into a trapezoid, since this would require one pair of
+sides to not be parallel.
+
+#### Translate
+
+Totally unrelated to language, a translation describes a displacement along
+the X and or Y axes - or simply put: how far right and down you want a thing to
+move.
+
+For example our friend Mx. Square from above lives in the top left-hand corner:
+
+![A black square with a white square in the top-left corner.](transform-translate-start.png)
+
+Say we translate them by `50, 120`:
+
+```python
+vector.set_transform(Transform().translate(50, 120))
+```
+
+![A black square with a white square toward the bottom-left corner.](transform-translate-end.png)
+
+Away they go... hey come back we're not done yet!
+
+#### Rotate
+
+```python
+Transform().rotate(angle_degrees, (origin_x, origin_y))
+```
+
+#### Scale
+
+```python
+Transform().scale(scale_x, scale_y)
+```
+
+#### Custom
+
+If you want to get fancy, you can supply a custom 2d transformation matrix as a
+list of nine floating point numbers. Eg:
+
+```python
+my_custom_transform = Transform().matrix([
+    1.0, 0.0, 0.0,
+    0.0, 1.0, 0.0,
+    0.0, 0.0, 1.0
+])
+```
+
+Okay, this one isn't so fancy- it's a standard "identity" matrix which has no
+effect whatsoever.
+
+What about calculating our own scale matrix?
+
+```python
+scale_x = 10
+scale_y = 10
+
+my_custom_transform = Transform().matrix([
+    scale_x, 0.0, 0.0,
+    0.0, scale_y, 0.0,
+    0.0, 0.0, 1.0
+])
+```
+
+Okay that was surprisingly easy. What about rotation, that must be hard, right?
+
+```python
+angle = math.pi / 4  # 45 degrees in radians
+my_custom_transform = Transform().matrix([
+    math.cos(angle), math.sin(angle), 0.0,
+    -math.sin(angle), math.cos(angle), 0.0,
+    0.0, 0.0, 1.0
+])
+```
+
+Nope, it's pretty much just scale with bells on.
\ No newline at end of file
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