pixie/README.md

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<img src="docs/banner.png">
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# Pixie - A full-featured 2D graphics library for Nim
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Pixie is a 2D graphics library similar to [Cairo](https://www.cairographics.org/) and [Skia](https://skia.org) written (almost) entirely in Nim.
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This library is being actively developed and we'd be happy for you to use it.
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`nimble install pixie`
Features:
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* Drawing paths, shapes and curves with even-odd and non-zero windings.
* Pixel-perfect AA quality.
* Supported file formats are PNG, BMP, JPG, SVG + more in development.
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* Strokes with joins and caps.
* Shadows, glows and blurs.
* Complex masking: Subtract, Intersect, Exclude.
* Complex blends: Darken, Multiply, Color Dodge, Hue, Luminosity... etc.
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### Documentation
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API reference: https://treeform.github.io/pixie/pixie.html
### File formats
Format | Read | Write |
------------- | ------------- | ------------- |
PNG | ✅ | ✅ |
JPEG | ✅ | |
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BMP | ✅ | ✅ |
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SVG | ✅ | |
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### Joins and caps
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Supported Caps:
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* Butt
* Round
* Square
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Supported Joins:
* Miter (with miter angle limit)
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* Bevel
* Round
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### Blending & masking
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Supported Blend Modes:
* Normal
* Darken
* Multiply
* ColorBurn
* Lighten
* Screen
* Color Dodge
* Overlay
* Soft Light
* Hard Light
* Difference
* Exclusion
* Hue
* Saturation
* Color
* Luminosity
Supported Mask Modes:
* Mask
* Overwrite
* Subtract Mask
* Intersect Mask
* Exclude Mask
### SVG style paths:
Format | Supported | Description |
------------- | ------------- | --------------------- |
M,m | ✅ | move to |
L,l | ✅ | line to |
h,h | ✅ | horizontal line to |
V,v | ✅ | vertical line to |
C,c,S,s | ✅ | cublic to |
Q,q,T,t | ✅ | quadratic to |
A,a | ✅ | arc to |
z | ✅ | close path |
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## Testing
`nimble test`
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## Examples
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### Square
[examples/square.nim](examples/square.nim)
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```nim
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let
pos = vec2(50, 50)
wh = vec2(100, 100)
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image.fillRect(rect(pos, wh), rgba(255, 0, 0, 255))
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```
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![example output](examples/square.png)
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### Line
[examples/line.nim](examples/line.nim)
```nim
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let
start = vec2(25, 25)
stop = vec2(175, 175)
color = parseHtmlColor("#FF5C00").rgba
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image.strokeSegment(segment(start, stop), color, strokeWidth = 10)
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```
![example output](examples/line.png)
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### Rounded rectangle
[examples/rounded_rectangle.nim](examples/rounded_rectangle.nim)
```nim
let
pos = vec2(50, 50)
wh = vec2(100, 100)
r = 25.0
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image.fillRoundedRect(rect(pos, wh), r, rgba(0, 255, 0, 255))
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```
![example output](examples/rounded_rectangle.png)
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### Heart
[examples/heart.nim](examples/heart.nim)
```nim
image.fillPath(
"""
M 20 60
A 40 40 90 0 1 100 60
A 40 40 90 0 1 180 60
Q 180 120 100 180
Q 20 120 20 60
z
""",
parseHtmlColor("#FC427B").rgba
)
```
![example output](examples/heart.png)
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### Masking
[examples/masking.nim](examples/masking.nim)
```nim
lines.strokeSegment(
segment(vec2(25, 25), vec2(175, 175)), color, strokeWidth = 30)
lines.strokeSegment(
segment(vec2(25, 175), vec2(175, 25)), color, strokeWidth = 30)
mask.fillPath(
"""
M 20 60
A 40 40 90 0 1 100 60
A 40 40 90 0 1 180 60
Q 180 120 100 180
Q 20 120 20 60
z
"""
)
lines.draw(mask)
image.draw(lines)
```
![example output](examples/masking.png)
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### Gradient
[examples/gradient.nim](examples/gradient.nim)
```nim
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let paint = Paint(
kind: pkGradientRadial,
gradientHandlePositions: @[
vec2(100, 100),
vec2(200, 100),
vec2(100, 200)
],
gradientStops: @[
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ColorStop(color: rgba(255, 0, 0, 255), position: 0),
ColorStop(color: rgba(255, 0, 0, 40), position: 1.0),
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]
)
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image.fillPath(
"""
M 20 60
A 40 40 90 0 1 100 60
A 40 40 90 0 1 180 60
Q 180 120 100 180
Q 20 120 20 60
z
""",
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paint
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)
```
![example output](examples/gradient.png)
### Image tiled
[examples/image_tiled.nim](examples/image_tiled.nim)
```nim
var path: Path
path.polygon(
vec2(100, 100),
70,
sides = 8
)
image.fillPath(
path,
Paint(
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kind: pkImageTiled,
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image: readImage("tests/images/png/baboon.png"),
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imageMat: scale(vec2(0.08, 0.08))
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)
)
```
![example output](examples/image_tiled.png)
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### Shadow
[examples/shadow.nim](examples/shadow.nim)
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```nim
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let polygonImage = newImage(200, 200)
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polygonImage.fillPolygon(
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vec2(100, 100),
70,
sides = 8,
rgba(255, 255, 255, 255)
)
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let shadow = polygonImage.shadow(
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offset = vec2(2, 2),
spread = 2,
blur = 10,
color = rgba(0, 0, 0, 200)
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)
image.draw(shadow)
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image.draw(polygonImage)
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```
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![example output](examples/shadow.png)
### Blur
[examples/blur.nim](examples/blur.nim)
```nim
let mask = newMask(200, 200)
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mask.fillPolygon(vec2(100, 100), 70, sides = 6)
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blur.blur(20)
blur.draw(mask, blendMode = bmMask)
image.draw(trees)
image.draw(blur)
```
![example output](examples/blur.png)
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### Tiger
[examples/tiger.nim](examples/tiger.nim)
```nim
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let tiger = readImage("examples/data/tiger.svg")
image.draw(
tiger,
translate(vec2(100, 100)) *
scale(vec2(0.2, 0.2)) *
translate(vec2(-450, -450))
)
```
![example output](examples/tiger.png)