Top Related Projects
Reproducing images with geometric primitives.
Wkhtmltopdf python wrapper to convert html to pdf
JavaScript 3D Library.
⚙️ Node.js tool for optimizing SVG files
Quick Overview
SVGO is a Go library for creating and manipulating Scalable Vector Graphics (SVG) files. It provides a simple and intuitive API for generating SVG content programmatically, allowing developers to create complex vector graphics using Go code.
Pros
- Easy-to-use API for creating SVG elements and attributes
- Supports a wide range of SVG features, including shapes, text, and transformations
- Lightweight and efficient, with minimal dependencies
- Well-documented with examples and tutorials
Cons
- Limited support for advanced SVG features like filters and animations
- May require additional libraries for more complex graphical operations
- Not as feature-rich as some other SVG manipulation libraries in other languages
- Limited community support compared to more popular graphics libraries
Code Examples
Creating a simple SVG with a circle:
package main
import (
"github.com/ajstarks/svgo"
"os"
)
func main() {
width, height := 500, 500
canvas := svg.New(os.Stdout)
canvas.Start(width, height)
canvas.Circle(width/2, height/2, 100)
canvas.End()
}
Drawing a line with custom stroke and color:
canvas.Line(100, 100, 300, 300, "stroke:red;stroke-width:3")
Adding text to the SVG:
canvas.Text(250, 250, "Hello, SVG!", "text-anchor:middle;font-size:24px")
Getting Started
To use SVGO in your Go project, follow these steps:
-
Install the library:
go get github.com/ajstarks/svgo
-
Import the library in your Go file:
import "github.com/ajstarks/svgo"
-
Create a new SVG canvas and start drawing:
canvas := svg.New(os.Stdout) canvas.Start(width, height) // Add your SVG elements here canvas.End()
-
Run your Go program to generate the SVG output.
Competitor Comparisons
Reproducing images with geometric primitives.
Pros of primitive
- Creates artistic, low-poly representations of images
- Supports multiple output formats (SVG, PNG, GIF)
- Offers fine-grained control over the generation process
Cons of primitive
- Focused on image processing, not general SVG creation
- May be slower for complex images due to optimization process
- Limited to geometric primitive shapes
Code comparison
primitive:
func DrawCircle(im *image.RGBA, x, y, r int, c color.Color) {
for dy := -r; dy <= r; dy++ {
for dx := -r; dx <= r; dx++ {
if dx*dx+dy*dy <= r*r {
im.Set(x+dx, y+dy, c)
}
}
}
}
svgo:
func (svg *SVG) Circle(x int, y int, r int, s ...string) {
svg.printf(`<circle cx="%d" cy="%d" r="%d"`, x, y, r)
svg.style(s)
svg.println("/>")
}
primitive focuses on rasterizing shapes for image processing, while svgo generates SVG markup directly. primitive offers more complex image manipulation capabilities, whereas svgo provides a simpler API for creating SVG elements. svgo is better suited for general SVG creation tasks, while primitive excels at generating artistic representations of images using geometric primitives.
Wkhtmltopdf python wrapper to convert html to pdf
Pros of python-pdfkit
- Focuses on PDF generation from HTML, offering a specialized tool for this task
- Provides a Python wrapper for wkhtmltopdf, making it easy to use in Python projects
- Supports various options for PDF customization, such as page size and orientation
Cons of python-pdfkit
- Requires external dependencies (wkhtmltopdf) to function
- Limited to PDF output, unlike svgo's versatility with SVG manipulation
- May have performance limitations when dealing with large or complex HTML documents
Code Comparison
python-pdfkit:
import pdfkit
pdfkit.from_url('http://google.com', 'out.pdf')
pdfkit.from_file('test.html', 'out.pdf')
pdfkit.from_string('Hello!', 'out.pdf')
svgo:
package main
import "github.com/ajstarks/svgo"
func main() {
canvas := svg.New(os.Stdout)
canvas.Circle(50, 50, 50)
canvas.End()
}
The code examples demonstrate the primary use cases for each library. python-pdfkit focuses on converting various inputs to PDF, while svgo is used for creating and manipulating SVG graphics programmatically.
JavaScript 3D Library.
Pros of three.js
- More comprehensive 3D graphics library with extensive features
- Larger community and ecosystem, with more resources and examples
- Better suited for complex 3D visualizations and interactive applications
Cons of three.js
- Steeper learning curve due to its complexity and extensive API
- Larger file size and potentially higher performance overhead
- May be overkill for simple 2D graphics or SVG-specific tasks
Code Comparison
three.js (3D scene setup):
const scene = new THREE.Scene();
const camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);
const renderer = new THREE.WebGLRenderer();
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);
svgo (SVG creation):
canvas := svg.New(os.Stdout)
canvas.Start(500, 500)
canvas.Circle(250, 250, 125, "fill:none;stroke:black")
canvas.Text(250, 250, "Hello, SVG", "text-anchor:middle;font-size:30px;fill:black")
canvas.End()
Summary
three.js is a powerful 3D graphics library with a large ecosystem, ideal for complex 3D visualizations. svgo is a simpler, Go-based library focused on SVG generation. three.js offers more features but has a steeper learning curve, while svgo is more lightweight and easier to use for basic SVG tasks. Choose based on your project requirements and complexity.
⚙️ Node.js tool for optimizing SVG files
Pros of svgo
- More comprehensive SVG optimization with a wider range of plugins
- Actively maintained with frequent updates and contributions
- Supports both CLI and JavaScript API usage
Cons of svgo
- More complex configuration and setup process
- Potential for unintended visual changes due to aggressive optimization
Code comparison
svgo:
const svgo = require('svgo');
const result = svgo.optimize(svgString, {
plugins: ['removeDoctype', 'removeXMLProcInst', 'removeComments']
});
console.log(result.data);
svgo:
package main
import (
"fmt"
"github.com/ajstarks/svgo"
"os"
)
func main() {
canvas := svg.New(os.Stdout)
canvas.Start(500, 500)
canvas.Circle(250, 250, 125, "fill:none;stroke:black")
canvas.End()
}
Summary
svgo is a more feature-rich and actively maintained SVG optimization tool, offering a wide range of plugins and optimization options. It provides both CLI and JavaScript API interfaces, making it versatile for different use cases. However, its complexity may require more setup time and careful configuration to avoid unintended visual changes.
svgo, on the other hand, is a simpler Go-based SVG generation library. It focuses on creating SVG content programmatically rather than optimizing existing SVGs. This makes it more suitable for generating SVG graphics from scratch in Go applications, but less ideal for optimization tasks.
The choice between these libraries depends on the specific needs of your project: SVG optimization (svgo) or SVG generation in Go (svgo).
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SVGo: A Go library for SVG generation
The library generates SVG as defined by the Scalable Vector Graphics 1.1 Specification (http://www.w3.org/TR/SVG11/). Output goes to the specified io.Writer.
Supported SVG elements and functions
Shapes, lines, text
circle, ellipse, polygon, polyline, rect (including roundrects), line, text
Paths
general, arc, cubic and quadratic bezier paths,
Image and Gradients
image, linearGradient, radialGradient,
Transforms
translate, rotate, scale, skewX, skewY
Animation
animate, animateMotion, animateTranslate, animateRotate, animateScale, animateSkewX, animateSkewY
Filter Effects
filter, feBlend, feColorMatrix, feColorMatrix, feComponentTransfer, feComposite, feConvolveMatrix, feDiffuseLighting, feDisplacementMap, feDistantLight, feFlood, feGaussianBlur, feImage, feMerge, feMorphology, feOffset, fePointLight, feSpecularLighting, feSpotLight,feTile, feTurbulence
Metadata elements
desc, defs, g (style, transform, id), marker, mask, pattern, title, (a)ddress, link, script, use
Building and Usage
See svgdef.[svg|png|pdf] for a graphical view of the function calls
Usage: (assuming GOPATH is set)
go get github.com/ajstarks/svgo
go install github.com/ajstarks/svgo/...
You can use godoc to browse the documentation from the command line:
$ go doc github.com/ajstarks/svgo
a minimal program, to generate SVG to standard output.
package main
import (
"github.com/ajstarks/svgo"
"os"
)
func main() {
width := 500
height := 500
canvas := svg.New(os.Stdout)
canvas.Start(width, height)
canvas.Circle(width/2, height/2, 100)
canvas.Text(width/2, height/2, "Hello, SVG", "text-anchor:middle;font-size:30px;fill:white")
canvas.End()
}
Drawing in a web server: (http://localhost:2003/circle)
package main
import (
"log"
"github.com/ajstarks/svgo"
"net/http"
)
func main() {
http.Handle("/circle", http.HandlerFunc(circle))
err := http.ListenAndServe(":2003", nil)
if err != nil {
log.Fatal("ListenAndServe:", err)
}
}
func circle(w http.ResponseWriter, req *http.Request) {
w.Header().Set("Content-Type", "image/svg+xml")
s := svg.New(w)
s.Start(500, 500)
s.Circle(250, 250, 125, "fill:none;stroke:black")
s.End()
}
You may view the SVG output with a browser that supports SVG (tested on Chrome, Opera, Firefox and Safari), or any other SVG user-agent such as Batik Squiggle.
Graphics Sketching with SVGo and svgplay
Combined with the svgplay command, SVGo can be used to "sketch" with code in a browser.
To use svgplay and SVGo, first go to a directory with your code, and run:
$ svgplay
2014/06/25 22:05:28 â â â Warning: this server allows a client connecting to 127.0.0.1:1999 to execute code on this computer â â â
Next open your browser to the svgplay server you just started. svgplay only listens on localhost, and uses port 1999 (guess which year SVG was first introduced) by default
http://localhost:1999/
Enter your code in the textarea, and when you are ready to run press Shift--Enter. The code will be compiled, with the results on the right. To update, change the code and repeat. Note that compilation errors are shown in red under the code. In order for svgplay/SVGo to work, make sure that the io.Writer specified with the New function is os.Stdout.
If you want to sketch with an existing file, enter its URL:
http://localhost:1999/foo.go
SVGo Papers and presentations
-
SVGo paper from SVGOpen 2011 http://www.svgopen.org/2011/papers/34-SVGo_a_Go_Library_for_SVG_generation
-
Programming Pictures with SVGo https://speakerdeck.com/u/ajstarks/p/programming-pictures-with-svgo
-
SVGo Workshop https://speakerdeck.com/u/ajstarks/p/svgo-workshop
Tutorial Video
A video describing how to use the package can be seen on YouTube at http://www.youtube.com/watch?v=ze6O2Dj5gQ4
Package contents
- svg.go: Library
- newsvg: Coding template command
- svgdef: Creates a SVG representation of the API
- animate: Animation demo
- am: Animate motion demo
- amt: Animate transformation demo
- android: The Android logo
- bubtrail: Bubble trails
- bulletgraph: Bullet Graphs (via Stephen Few)
- colortab: Display SVG named colors with RGB values
- compx: Component diagrams
- flower: Random "flowers"
- fontcompare: Compare two fonts
- f50: Get 50 photos from Flickr based on a query
- fe: Filter effects
- funnel: Funnel from transparent circles
- gradient: Linear and radial gradients
- html5logo: HTML5 logo with draggable elements
- imfade: Show image fading
- lewitt: Version of Sol Lewitt's Wall Drawing 91
- ltr: Layer Tennis Remixes
- marker: Test markers
- paths: Demonstrate SVG paths
- pattern: Test patterns
- planets: Show the scale of the Solar system
- pmap: Proportion maps
- randcomp: Compare random number generators
- richter: Gerhard Richter's 256 colors
- rl: Random lines (port of a Processing demo)
- skewabc: Skew ABC
- span: Text span
- stockproduct: Visualize product and stock prices
- svgopher: SVGo Mascot
- svgplay: SVGo sketching server
- svgplot: Plot data
- svgrid: Compose SVG files in a grid
- tsg: Twitter Search Grid
- tumblrgrid: Tumblr picture grid
- turbulence: Turbulence filter effect
- vismem: Visualize data from files
- webfonts: "Hello, World" with Google Web Fonts
- websvg: Generate SVG as a web server
Functions and types
Many functions use x, y to specify an object's location, and w, h to specify the object's width and height.
Where applicable, a final optional argument specifies the style to be applied to the object.
The style strings follow the SVG standard; name:value pairs delimited by semicolons, or a
series of name="value" pairs. For example: "fill:none; opacity:0.3"
or fill="none" opacity="0.3"
(see: http://www.w3.org/TR/SVG11/styling.html)
The SVG type:
type SVG struct {
Writer io.Writer
}
Most operations are methods on this type, specifying the destination io.Writer.
The Offcolor type:
type Offcolor struct {
Offset uint8
Color string
Opacity float64
}
is used to specify the offset, color, and opacity of stop colors in linear and radial gradients
The Filterspec type:
type Filterspec struct {
In string
In2 string
Result string
}
is used to specify inputs and results for filter effects
Structure, Scripting, Metadata, Transformation and Links
New(w io.Writer) *SVG
Constructor, Specify the output destination.
Start(w int, h int, attributes ...string)
begin the SVG document with the width w and height h. Optionally add additional elements (such as additional namespaces or scripting events) http://www.w3.org/TR/SVG11/struct.html#SVGElement
Startview(w, h, minx, miny, vw, vh int)
begin the SVG document with the width w, height h, with a viewBox at minx, miny, vw, vh. http://www.w3.org/TR/SVG11/struct.html#SVGElement
Startunit(w int, h int, unit string, ns ...string)
begin the SVG document, with width and height in the specified units. Optionally add additional elements (such as additional namespaces or scripting events) http://www.w3.org/TR/SVG11/struct.html#SVGElement
Startpercent(w int, h int, ns ...string)
begin the SVG document, with width and height in percent. Optionally add additional elements (such as additional namespaces or scripting events) http://www.w3.org/TR/SVG11/struct.html#SVGElement
StartviewUnit(w, h int, unit string, minx, miny, vw, vh int)
begin the SVG document with the width w, height h, in the specified unit, with a viewBox at minx, miny, vw, vh. http://www.w3.org/TR/SVG11/struct.html#SVGElement
End()
end the SVG document
Script(scriptype string, data ...string)
Script defines a script with a specified type, (for example "application/javascript"). if the first variadic argument is a link, use only the link reference. Otherwise, treat variadic arguments as the text of the script (marked up as CDATA). if no data is specified, simply close the script element. http://www.w3.org/TR/SVG/script.html
Style(scriptype string, data ...string)
Style defines a script with a specified type, (for example "text/css"). if the first variadic argument is a link, use only the link reference. Otherwise, treat variadic arguments as the text of the script (marked up as CDATA). if no data is specified, simply close the style element. https://www.w3.org/TR/SVG/styling.html#StyleElement
Group(s ...string)
begin a group, with arbitrary attributes http://www.w3.org/TR/SVG11/struct.html#GElement
Gstyle(s string)
begin a group, with the specified style. http://www.w3.org/TR/SVG11/struct.html#GElement
Gid(s string)
begin a group, with the specified id.
Gtransform(s string)
begin a group, with the specified transform, end with Gend(). http://www.w3.org/TR/SVG11/coords.html#TransformAttribute
Translate(x, y int)
begins coordinate translation to (x,y), end with Gend(). http://www.w3.org/TR/SVG11/coords.html#TransformAttribute
Scale(n float64)
scales the coordinate system by n, end with Gend(). http://www.w3.org/TR/SVG11/coords.html#TransformAttribute
ScaleXY(x, y float64)
scales the coordinate system by x, y. End with Gend(). http://www.w3.org/TR/SVG11/coords.html#TransformAttribute
SkewX(a float64)
SkewX skews the x coordinate system by angle a, end with Gend(). http://www.w3.org/TR/SVG11/coords.html#TransformAttribute
SkewY(a float64)
SkewY skews the y coordinate system by angle a, end with Gend(). http://www.w3.org/TR/SVG11/coords.html#TransformAttribute
SkewXY(ax, ay float64)
SkewXY skews x and y coordinate systems by ax, ay respectively, end with Gend(). http://www.w3.org/TR/SVG11/coords.html#TransformAttribute
Rotate(r float64)
rotates the coordinate system by r degrees, end with Gend(). http://www.w3.org/TR/SVG11/coords.html#TransformAttribute
TranslateRotate(x, y int, r float64)
translates the coordinate system to (x,y), then rotates to r degrees, end with Gend().
RotateTranslate(x, y int, r float64)
rotates the coordinate system r degrees, then translates to (x,y), end with Gend().
Gend()
end the group (must be paired with Gstyle, Gtransform, Gid).
ClipPath(s ...string)
Begin a ClipPath http://www.w3.org/TR/SVG/masking.html#ClippingPaths
ClipEnd()
End a ClipPath http://www.w3.org/TR/SVG/masking.html#ClippingPaths
Def()
begin a definition block. http://www.w3.org/TR/SVG11/struct.html#DefsElement
DefEnd()
end a definition block.
Marker(id string, x, y, w, h int, s ...string)
define a marker http://www.w3.org/TR/SVG11/painting.html#MarkerElement
MarkerEnd()
end a marker
Mask(id string, x int, y int, w int, h int, s ...string)
creates a mask with a specified id, dimension, and optional style. http://www.w3.org/TR/SVG/masking.html
MaskEnd()
ends the Mask element.
Pattern(id string, x, y, width, height int, putype string, s ...string)
define a Pattern with the specified dimensions, the putype can be either "user" or "obj", which sets the patternUnits attribute to be either userSpaceOnUse or objectBoundingBox. http://www.w3.org/TR/SVG11/pservers.html#Patterns
Desc(s string)
specify the text of the description. http://www.w3.org/TR/SVG11/struct.html#DescElement
Title(s string)
specify the text of the title. http://www.w3.org/TR/SVG11/struct.html#TitleElement
Link(href string, title string)
begin a link named "href", with the specified title. http://www.w3.org/TR/SVG11/linking.html#Links
LinkEnd()
end the link.
Use(x int, y int, link string, s ...string)
place the object referenced at link at the location x, y. http://www.w3.org/TR/SVG11/struct.html#UseElement
Shapes
Circle(x int, y int, r int, s ...string)
draw a circle, centered at x,y with radius r. http://www.w3.org/TR/SVG11/shapes.html#CircleElement
Ellipse(x int, y int, w int, h int, s ...string)
draw an ellipse, centered at x,y with radii w, and h. http://www.w3.org/TR/SVG11/shapes.html#EllipseElement
Polygon(x []int, y []int, s ...string)
draw a series of line segments using an array of x, y coordinates. http://www.w3.org/TR/SVG11/shapes.html#PolygonElement
Rect(x int, y int, w int, h int, s ...string)
draw a rectangle with upper left-hand corner at x,y, with width w, and height h. http://www.w3.org/TR/SVG11/shapes.html#RectElement
CenterRect(x int, y int, w int, h int, s ...string)
draw a rectangle with its center at x,y, with width w, and height h.
Roundrect(x int, y int, w int, h int, rx int, ry int, s ...string)
draw a rounded rectangle with upper the left-hand corner at x,y, with width w, and height h. The radii for the rounded portion is specified by rx (width), and ry (height).
Square(x int, y int, s int, style ...string)
draw a square with upper left corner at x,y with sides of length s.
Paths
Path(p string, s ...style)
draw the arbitrary path as specified in p, according to the style specified in s. http://www.w3.org/TR/SVG11/paths.html
Arc(sx int, sy int, ax int, ay int, r int, large bool, sweep bool, ex int, ey int, s ...string)
draw an elliptical arc beginning coordinate at sx,sy, ending coordinate at ex, ey width and height of the arc are specified by ax, ay, the x axis rotation is r
if sweep is true, then the arc will be drawn in a "positive-angle" direction (clockwise), if false, the arc is drawn counterclockwise.
if large is true, the arc sweep angle is greater than or equal to 180 degrees, otherwise the arc sweep is less than 180 degrees. http://www.w3.org/TR/SVG11/paths.html#PathDataEllipticalArcCommands
Bezier(sx int, sy int, cx int, cy int, px int, py int, ex int, ey int, s ...string)
draw a cubic bezier curve, beginning at sx,sy, ending at ex,ey with control points at cx,cy and px,py. http://www.w3.org/TR/SVG11/paths.html#PathDataCubicBezierCommands
Qbezier(sx int, sy int, cx int, cy int, ex int, ey int, tx int, ty int, s ...string)
draw a quadratic bezier curve, beginning at sx, sy, ending at tx,ty with control points are at cx,cy, ex,ey. http://www.w3.org/TR/SVG11/paths.html#PathDataQuadraticBezierCommands
Qbez(sx int, sy int, cx int, cy int, ex int, ey int, s...string)
draws a quadratic bezier curver, with optional style beginning at sx,sy, ending at ex, sy with the control point at cx, cy. http://www.w3.org/TR/SVG11/paths.html#PathDataQuadraticBezierCommands
Lines
Line(x1 int, y1 int, x2 int, y2 int, s ...string)
draw a line segment between x1,y1 and x2,y2. http://www.w3.org/TR/SVG11/shapes.html#LineElement
Polyline(x []int, y []int, s ...string)
draw a polygon using coordinates specified in x,y arrays. http://www.w3.org/TR/SVG11/shapes.html#PolylineElement
Image and Text
Image(x int, y int, w int, h int, link string, s ...string)
place at x,y (upper left hand corner), the image with width w, and height h, referenced at link. http://www.w3.org/TR/SVG11/struct.html#ImageElement
Text(x int, y int, t string, s ...string)
Place the specified text, t at x,y according to the optional style specified in s. http://www.w3.org/TR/SVG11/text.html#TextElement
Textspan(x int, y int, t string, s ...string)
Place specified text, t at x,y according to the optional style specified in s. https://www.w3.org/TR/SVG11/text.html#TSpanElement Use this method with Span(...). End with TextEnd()
Span(t string, s ...string)
Create a text span t, using optional style s
TextEnd()
End a text span
Textlines(x, y int, s []string, size, spacing int, fill, align string)
Places lines of text in s, starting at x,y, at the specified size, fill, and alignment, and spacing.
Textpath(t string, pathid string, s ...string)
places optionally styled text along a previously defined path. http://www.w3.org/TR/SVG11/text.html#TextPathElement
Color
RGB(r int, g int, b int) string
creates a style string for the fill color designated by the (r)ed, g(reen), (b)lue components. http://www.w3.org/TR/css3-color/
RGBA(r int, g int, b int, a float64) string
as above, but includes the color's opacity as a value between 0.0 (fully transparent) and 1.0 (opaque).
Gradients
LinearGradient(id string, x1, y1, x2, y2 uint8, sc []Offcolor)
constructs a linear color gradient identified by id, along the vector defined by (x1,y1), and (x2,y2). The stop color sequence defined in sc. Coordinates are expressed as percentages. http://www.w3.org/TR/SVG11/pservers.html#LinearGradients
RadialGradient(id string, cx, cy, r, fx, fy uint8, sc []Offcolor)
constructs a radial color gradient identified by id, centered at (cx,cy), with a radius of r. (fx, fy) define the location of the focal point of the light source. The stop color sequence defined in sc. Coordinates are expressed as percentages. http://www.w3.org/TR/SVG11/pservers.html#RadialGradients
Animation
Animate(link, attr string, from, to int, duration float64, repeat int, s ...string)
Animate animates the item referenced by the link, using the specified attribute The animation starts at coordinate from, terminates at to, and repeats as specified. Addtional attributes may be added as needed. https://www.w3.org/TR/SVG11/animate.html#AnimateElement
AnimateMotion(link, path string, duration float64, repeat int, s ...string)
AnimateMotion animates the referenced object link
along the specified path
https://www.w3.org/TR/SVG11/animate.html#AnimateMotionElement
AnimateTranslate(link string, fx, fy, tx, ty int, duration float64, repeat int, s ...string)
AnimateTranslate animates the translation transformation (link refers to the object to animate, fx, fy are from coordinates, tx, ty are the to coordinates) https://www.w3.org/TR/SVG11/animate.html#AnimateTransformElement
AnimateRotate(link string, fs, fc, fe, ts, tc, te int, duration float64, repeat int, s ...string)
AnimateRotate animates the rotation transformation (link refers to the object to animate, f[s,c,e] are the from start, center, and end angles, t[s,c,e] are the start, center, and end angles) https://www.w3.org/TR/SVG11/animate.html#AnimateTransformElement
AnimateScale(link string, from, to, duration float64, repeat int, s ...string)
AnimateScale animates the scale transformation (link refers to the object to animate, from and to specify the scaling factor) https://www.w3.org/TR/SVG11/animate.html#AnimateTransformElement
AnimateSkewX(link string, from, to, duration float64, repeat int, s ...string)
AnimateSkewX animates the skewX transformation ((link refers to the object to animate, from and to specify the skew angle) https://www.w3.org/TR/SVG11/animate.html#AnimateTransformElement
AnimateSkewY(link string, from, to, duration float64, repeat int, s ...string)
AnimateSkewY animates the skewY transformation (link refers to the object to animate, and from and to specify the skew angle) https://www.w3.org/TR/SVG11/animate.html#AnimateTransformElement
Filter Effects
Filter(id string, s ...string)
Filter begins a filter set Standard reference: http://www.w3.org/TR/SVG11/filters.html#FilterElement
Fend()
Fend ends a filter set Standard reference: http://www.w3.org/TR/SVG11/filters.html#FilterElement
FeBlend(fs Filterspec, mode string, s ...string)
FeBlend specifies a Blend filter primitive Standard reference: http://www.w3.org/TR/SVG11/filters.html#feBlendElement
FeColorMatrix(fs Filterspec, values [20]float64, s ...string)
FeColorMatrix specifies a color matrix filter primitive, with matrix values Standard reference: http://www.w3.org/TR/SVG11/filters.html#feColorMatrixElement
FeColorMatrixHue(fs Filterspec, value float64, s ...string)
FeColorMatrix specifies a color matrix filter primitive, with hue values Standard reference: http://www.w3.org/TR/SVG11/filters.html#feColorMatrixElement
FeColorMatrixSaturate(fs Filterspec, value float64, s ...string)
FeColorMatrix specifies a color matrix filter primitive, with saturation values Standard reference: http://www.w3.org/TR/SVG11/filters.html#feColorMatrixElement
FeColorMatrixLuminence(fs Filterspec, s ...string)
FeColorMatrix specifies a color matrix filter primitive, with luminence values Standard reference: http://www.w3.org/TR/SVG11/filters.html#feColorMatrixElement
FeComponentTransfer()
FeComponentTransfer begins a feComponent filter Element> Standard reference: http://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
FeCompEnd()
FeCompEnd ends a feComponent filter Element>
FeComposite(fs Filterspec, operator string, k1, k2, k3, k4 int, s ...string)
FeComposite specifies a feComposite filter primitive Standard reference: http://www.w3.org/TR/SVG11/filters.html#feCompositeElement
FeConvolveMatrix(fs Filterspec, matrix [9]int, s ...string)
FeConvolveMatrix specifies a feConvolveMatrix filter primitive Standard reference: http://www.w3.org/TR/SVG11/filters.html#feConvolveMatrixElement
FeDiffuseLighting(fs Filterspec, scale, constant float64, s ...string)
FeDiffuseLighting specifies a diffuse lighting filter primitive, a container for light source Element>s, end with DiffuseEnd()
FeDiffEnd()
FeDiffuseEnd ends a diffuse lighting filter primitive container Standard reference: http://www.w3.org/TR/SVG11/filters.html#feDiffuseLightingElement
FeDisplacementMap(fs Filterspec, scale float64, xchannel, ychannel string, s ...string)
FeDisplacementMap specifies a feDisplacementMap filter primitive Standard reference: http://www.w3.org/TR/SVG11/filters.html#feDisplacementMapElement
FeDistantLight(fs Filterspec, azimuth, elevation float64, s ...string)
FeDistantLight specifies a feDistantLight filter primitive Standard reference: http://www.w3.org/TR/SVG11/filters.html#feDistantLightElement
FeFlood(fs Filterspec, color string, opacity float64, s ...string)
FeFlood specifies a flood filter primitive Standard reference: http://www.w3.org/TR/SVG11/filters.html#feFloodElement
FeFuncLinear(channel string, slope, intercept float64)
FeFuncLinear is the linear form of feFunc Standard reference: http://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
FeFuncGamma(channel, amplitude, exponent, offset float64)
FeFuncGamma is the gamma curve form of feFunc Standard reference: http://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
FeFuncTable(channel string, tv []float64)
FeFuncGamma is the form of feFunc using a table of values Standard reference: http://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
FeFuncDiscrete(channel string, tv []float64)
FeFuncGamma is the form of feFunc using discrete values Standard reference: http://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
FeGaussianBlur(fs Filterspec, stdx, stdy float64, s ...string)
FeGaussianBlur specifies a Gaussian Blur filter primitive Standard reference: http://www.w3.org/TR/SVG11/filters.html#feGaussianBlurElement
FeImage(href string, result string, s ...string)
FeImage specifies a feImage filter primitive Standard reference: http://www.w3.org/TR/SVG11/filters.html#feImageElement
FeMerge(nodes []string, s ...string)
FeMerge specifies a feMerge filter primitive, containing feMerge Element>s Standard reference: http://www.w3.org/TR/SVG11/filters.html#feMergeElement
FeMorphology(fs Filterspec, operator string, xradius, yradius float64, s ...string)
FeMorphologyLight specifies a feMorphologyLight filter primitive Standard reference: http://www.w3.org/TR/SVG11/filters.html#feMorphologyElement
FeOffset(fs Filterspec, dx, dy int, s ...string)
FeOffset specifies the feOffset filter primitive Standard reference: http://www.w3.org/TR/SVG11/filters.html#feOffsetElement
FePointLight(x, y, z float64, s ...string)
FePointLight specifies a fePpointLight filter primitive Standard reference: http://www.w3.org/TR/SVG11/filters.html#fePointLightElement
FeSpecularLighting(fs Filterspec, scale, constant float64, exponent int, color string, s ...string)
FeSpecularLighting specifies a specular lighting filter primitive, a container for light source elements, end with SpecularEnd()
FeSpecEnd()
FeSpecularEnd ends a specular lighting filter primitive container Standard reference: http://www.w3.org/TR/SVG11/filters.html#feSpecularLightingElement
FeSpotLight(fs Filterspec, x, y, z, px, py, pz float64, s ...string)
FeSpotLight specifies a feSpotLight filter primitive Standard reference: http://www.w3.org/TR/SVG11/filters.html#feSpotLightElement
FeTile(fs Filterspec, in string, s ...string)
FeTile specifies the tile utility filter primitive Standard reference: http://www.w3.org/TR/SVG11/filters.html#feTileElement
FeTurbulence(fs Filterspec, ftype string, bfx, bfy float64, octaves int, seed int64, stitch bool, s ...string)
FeTurbulence specifies a turbulence filter primitive Standard reference: http://www.w3.org/TR/SVG11/filters.html#feTurbulenceElement
Filter convenience functions (modeled on CSS filter effects)
Blur(p float64)
Blur function by standard deviation
Brightness(p float64)
Brightness function (0-100)
Grayscale()
Apply a grayscale filter to the image
HueRotate(a float64)
Rotate Hues (0-360 degrees)
Invert()
Invert the image's colors
Saturate(p float64)
Percent saturation, 0 is grayscale
Sepia()
Apply sepia tone
Utility
Grid(x int, y int, w int, h int, n int, s ...string)
draws a grid of straight lines starting at x,y, with a width w, and height h, and a size of n.
Credits
Thanks to Jonathan Wright for the io.Writer update.
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