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goskew.go
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goskew.go
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// Copyright 2021 Oliver Strik
// This project includes code derived from gSkewer (https://github.com/MechanizedMedic/gskewer),
// which is licensed under the GNU General Public License version 3.0 (GPLv3).
// For the terms of the GPLv3 license, please see the LICENSE file included in this distribution.
package main
import (
"fmt"
"log"
"math"
"os"
"path/filepath"
"regexp"
"strconv"
"strings"
"github.com/docopt/docopt-go"
"github.com/schollz/progressbar"
)
func sq(val float64) float64 {
return val * val
}
func triangleError(base float64, left float64, right float64) float64 {
// calclate the height of the reference equilateral
height := math.Sin(math.Pi/3) * 1000
// calculate the left angle of the printed triangle
alpha := math.Acos((sq(left) + sq(base) - sq(right)) / (2 * left * base))
// calculate the X distance to the point at <height> along the projected left side.
delta := height / math.Tan(alpha)
// calculate the error in x.
xerr := delta - 1000/2
// return the xytan error.
return xerr / height
}
func getCoord(in *float64, reg *regexp.Regexp, line string) {
search := reg.FindStringSubmatch(line)
if len(search) > 0 {
*in, _ = strconv.ParseFloat(search[1], 64)
}
}
func skew(input []byte, xytan float64, xztan float64, yztan float64) string {
lines := strings.Split(string(input), "\n")
progress := progressbar.New(len(lines))
progress.SetWriter(os.Stderr)
// init the coords
xin, yin, zin := 0.0, 0.0, 0.0
// init the regular expressions
xreg, _ := regexp.Compile(`[xX](-?\d*\.?\d*)`)
yreg, _ := regexp.Compile(`[yY](-?\d*\.?\d*)`)
zreg, _ := regexp.Compile(`[zZ](-?\d*\.?\d*)`)
g01, _ := regexp.Compile(`^\s*G[0-1]`)
cmd, _ := regexp.Compile(`^\s*;\s*goskew\s+([^\s;]+).*$`)
enabled := true
for i, line := range lines {
if enabled && g01.MatchString(line) {
// find X, Y, and Y coords in line
getCoord(&xin, xreg, line)
getCoord(&yin, yreg, line)
getCoord(&zin, zreg, line)
// skew the X and Y. Z is unchanged to avoid squishing layers.
xout := fmt.Sprintf("%.3f", (xin-yin*xytan)-zin*xztan)
yout := fmt.Sprintf("%.3f", yin-zin*yztan)
// replace the X and Y coords
line = xreg.ReplaceAllString(line, "X"+xout)
line = yreg.ReplaceAllString(line, "Y"+yout)
lines[i] = line
}
cmatches := cmd.FindStringSubmatch(strings.ToLower(line))
if len(cmatches) > 1 {
switch cmatches[1] {
case "on":
enabled = true
case "enable":
enabled = true
case "off":
enabled = false
case "disable":
enabled = false
}
}
progress.Add(1)
}
fmt.Printf("\n")
return strings.Join(lines, "\n")
}
func main() {
usage := `Go Skew.
Usage:
%basename% err (--xy=<xy> | <xy>) (--xz=<xz> | <xz>) (--yz=<yz> | <yz>) [--output=FILE] <file>
%basename% tri <base> <left> <right> [--xz=<xz> --yz=<yz> --output=FILE] [<file>]
%basename% -h | --help
Options:
-o FILE, --output=FILE The file name to write out to, by default Go Skew overwrites the original file.
--xy=ERROR The error tangent in the XY axis.
--xz=ERROR The error tangent in the XZ axis.
--yz=ERROR The error tangent in the YZ axis.
-h, --help
`
basename := filepath.Base(os.Args[0])
usage = strings.ReplaceAll(usage, "%basename%", basename)
opts, _ := docopt.ParseDoc(usage)
// fmt.Println(opts)
// The tan error in all planes
xy, xz, yz := 0.0, 0.0, 0.0
// are we in triangle mode?
triangle, _ := opts.Bool("tri")
if triangle {
fmt.Println("calculating xytan from given triangle")
// extract options
base, _ := opts.Float64("<base>")
left, _ := opts.Float64("<left>")
right, _ := opts.Float64("<right>")
// calculate the xytan
xy = triangleError(base, left, right)
// get the xz and yz errors if given
xz, _ = opts.Float64("--xz")
yz, _ = opts.Float64("--yz")
} else {
var err error
// get the tan errors.
xy, err = opts.Float64("<xy>")
if err != nil {
xy, _ = opts.Float64("--xy")
}
xz, err = opts.Float64("<xz>")
if err != nil {
xz, _ = opts.Float64("--xz")
}
yz, err = opts.Float64("<yz>")
if err != nil {
yz, _ = opts.Float64("--yz")
}
}
fmt.Printf("Error tangents:\nxytan: %0.7f, xztan: %0.7f, yztan: %0.7f\n", xy, xz, yz)
iFile, _ := opts.String("<file>")
oFile, _ := opts.String("--output")
if iFile == "" {
return
}
if oFile == "" {
oFile = iFile
}
input, err := os.ReadFile(iFile)
if err != nil {
log.Fatalln(err)
}
fmt.Printf("skewing")
output := skew(input, xy, xz, yz)
err = os.WriteFile(oFile, []byte(output), 0644)
if err != nil {
log.Fatalln(err)
}
fmt.Println("Done!")
}