3D line engine with UI

bunny.go

package main

import "github.com/fogleman/ln/ln"
import (
    "net/http"
    "io/ioutil"
    "strconv"
    "fmt"
)

func main() {
	http.HandleFunc("/", handler)
  http.ListenAndServe(":8080", nil)
}

func FloatToString(input_num float64) string {
    // to convert a float number to a string
    return strconv.FormatFloat(input_num, 'f', 6, 64)
}


func handler(w http.ResponseWriter, r *http.Request) {
	scene := ln.Scene{}
	mesh, err := ln.LoadOBJ("bunny.obj")
	if err != nil {
		panic(err)
	}

  r.ParseForm()                     // Parses the request body
	x, err := strconv.ParseFloat(r.Form.Get("x"), 64)
	y, err := strconv.ParseFloat(r.Form.Get("y"), 64)
	z, err := strconv.ParseFloat(r.Form.Get("z"), 64)

	cax, err := strconv.ParseFloat(r.Form.Get("cax"), 64)
	cay, err := strconv.ParseFloat(r.Form.Get("cay"), 64)
	caz, err := strconv.ParseFloat(r.Form.Get("caz"), 64)


	upx, err := strconv.ParseFloat(r.Form.Get("upx"), 64)
	upy, err := strconv.ParseFloat(r.Form.Get("upy"), 64)
	upz, err := strconv.ParseFloat(r.Form.Get("upz"), 64)

	//log.Println("x", string(x))
	//log.Println("y", string(y))
  fmt.Println(FloatToString(x))
  fmt.Println(FloatToString(y))
  fmt.Println(FloatToString(z))

	mesh.UnitCube()
	scene.Add(ln.NewTransformedShape(mesh, ln.Rotate(ln.Vector{x,y,z}, 0.5)))
	// scene.Add(mesh)
	eye := ln.Vector{cax, cay, caz}
	center := ln.Vector{0,0,0}
	up := ln.Vector{upx, upy, upz}
	width := 1024.0
	height := 1024.0
	paths := scene.Render(eye, center, up, width, height, 20, 0.1, 10, 0.01)
	paths.WriteToPNG("out.png", width, height)
	
	savesvg := r.Form.Get("savesvg")
	if savesvg != "" {
		paths.WriteToSVG("out.svg", width, height)
	}

  file, err := ioutil.ReadFile("out.png")
  if err != nil {
      http.Error(w, err.Error(), http.StatusNotFound)
      return
  }
  w.Header().Set("Content-type", "image/png")
  w.Write(file)
}