- Package for generating HTML and CSS together, on the fly.
- Can also be used for generating HTML, XML or CSS (or templates).
- HTML and CSS can be generated together, but be presented as two seperate (but linked) files.
- Could be used to set up a diskless webserver that generates all the content on the fly (something similar could also be achieved by using templates that are not stored on disk).
New/experimental features:
- Generate WebGL graphics with Three.JS on the fly.
- Generate AngularJS applications on the fly.
The SVG related code has been refactored out, optimized and moved to the tinysvg package.
Create hardware accelerated 3D-graphics with three.js
Experiment with AngularJS
Example for Negroni
package main
import (
"fmt"
"net/http"
"github.com/urfave/negroni"
"github.com/xyproto/onthefly"
"github.com/xyproto/tinysvg"
)
// Generate a new SVG image
func svgImage() []byte {
document, svg := tinysvg.NewTinySVG(128, 64)
svg.Describe("Hello SVG")
// x, y, radius, color
svg.Circle(30, 10, 5, "red")
svg.Circle(110, 30, 2, "green")
svg.Circle(80, 40, 7, "blue")
// x, y, font size, font family, text and color
svg.Text(3, 60, 6, "Courier", "There will be cake", "#394851")
return document.Bytes()
}
// Generate a new onthefly Page (HTML5 and CSS combined)
func indexPage(svgurl string) *onthefly.Page {
// Create a new HTML5 page, with CSS included
page := onthefly.NewHTML5Page("Demonstration")
// Add some text
page.AddContent(fmt.Sprintf("onthefly %.1f", onthefly.Version))
// Change the margin (em is default)
page.SetMargin(4)
// Change the font family
page.SetFontFamily("serif") // or: sans-serif
// Change the color scheme
page.SetColor("black", "#d0d0d0")
// Include the generated SVG image on the page
body, err := page.GetTag("body")
if err == nil {
// CSS attributes for the body tag
body.AddStyle("font-size", "2em")
body.AddStyle("font-family", "sans-serif")
// Paragraph
p := body.AddNewTag("p")
// CSS style
p.AddStyle("margin-top", "2em")
// Image tag
img := p.AddNewTag("img")
// HTML attributes
img.AddAttrib("src", svgurl)
img.AddAttrib("alt", "Three circles")
// CSS style
img.AddStyle("width", "60%")
img.AddStyle("border", "4px solid white")
}
return page
}
// Set up the paths and handlers then start serving.
func main() {
fmt.Println("onthefly ", onthefly.Version)
// Create a Negroni instance and a ServeMux instance
n := negroni.Classic()
mux := http.NewServeMux()
// Publish the generated SVG as "/circles.svg"
svgurl := "/circles.svg"
mux.HandleFunc(svgurl, func(w http.ResponseWriter, req *http.Request) {
w.Header().Add("Content-Type", "image/svg+xml")
w.Write(svgImage())
})
// Generate a Page that includes the svg image
page := indexPage(svgurl)
// Publish the generated Page in a way that connects the HTML and CSS
page.Publish(mux, "/", "/style.css", false)
// Handler goes last
n.UseHandler(mux)
// Listen for requests at port 3000
n.Run(":3000")
}package main
import (
"fmt"
"log"
"net/http"
"time"
"github.com/xyproto/onthefly"
"github.com/xyproto/tinysvg"
)
// Generate a new SVG image
func svgImage() []byte {
document, svg := tinysvg.NewTinySVG(128, 64)
svg.Describe("Hello SVG")
// x, y, radius, color
svg.Circle(30, 10, 5, "red")
svg.Circle(110, 30, 2, "green")
svg.Circle(80, 40, 7, "blue")
// x, y, font size, font family, text and color
svg.Text(3, 60, 6, "Courier", "There will be cake", "#394851")
return document.Bytes()
}
// Generate a new onthefly Page (HTML5 and CSS combined)
func indexPage(svgurl string) *onthefly.Page {
// Create a new HTML5 page, with CSS included
page := onthefly.NewHTML5Page("Demonstration")
// Add some text
page.AddContent(fmt.Sprintf("onthefly %.1f", onthefly.Version))
// Change the margin (em is default)
page.SetMargin(4)
// Change the font family
page.SetFontFamily("serif") // or: sans-serif
// Change the color scheme
page.SetColor("black", "#d0d0d0")
// Include the generated SVG image on the page
body, err := page.GetTag("body")
if err == nil {
// CSS attributes for the body tag
body.AddStyle("font-size", "2em")
body.AddStyle("font-family", "sans-serif")
// Paragraph
p := body.AddNewTag("p")
// CSS style
p.AddStyle("margin-top", "2em")
// Image tag
img := p.AddNewTag("img")
// HTML attributes
img.AddAttrib("src", svgurl)
img.AddAttrib("alt", "Three circles")
// CSS style
img.AddStyle("width", "60%")
img.AddStyle("border", "4px solid white")
}
return page
}
// Set up the paths and handlers then start serving.
func main() {
fmt.Println("onthefly ", onthefly.Version)
// Create a mux
mux := http.NewServeMux()
// Publish the generated SVG as "/circles.svg"
svgurl := "/circles.svg"
mux.HandleFunc(svgurl, func(w http.ResponseWriter, req *http.Request) {
w.Header().Add("Content-Type", "image/svg+xml")
w.Write(svgImage())
})
// Generate a Page that includes the svg image
page := indexPage(svgurl)
// Publish the generated Page in a way that connects the HTML and CSS
page.Publish(mux, "/", "/style.css", false)
// Configure the HTTP server and permissionHandler struct
s := &http.Server{
Addr: ":3000",
Handler: mux,
ReadTimeout: 10 * time.Second,
WriteTimeout: 10 * time.Second,
MaxHeaderBytes: 1 << 20,
}
log.Println("Listening for requests on port 3000")
// Start listening
log.Fatal(s.ListenAndServe())
}Screenshots from version 0.8:
- Version: 1.2.3
- Alexander F Rødseth <xyproto@archlinux.org>
- License: BSD-3