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main.htm
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<!doctype html><meta charset=utf-8>
<title>Plotterfun</title>
<style>
*{font-family:sans-serif}
h2{padding:10px;margin:0}
input~input[type=text] {width:40px; border:1px solid #999;vertical-align:3px}
input[type=checkbox]{vertical-align:-5%;margin:0px 5px}
input[type=number]{width:50px}
label:hover{color:#4a6071}
#sidebar {width:300px;background:#dfedf7}
video{max-width:100%;transform:scaleX(-1)}
canvas{max-width:100%; max-height:320px}
svg{position:fixed; left:320px; top:10px}
form{padding:5px; line-height:2em}
#msgbox{position:fixed; left:320px; bottom:20px; padding:6px}
#msgbox:not(:empty) {background:rgba(255,255,255,0.8)}
#webcam{display:none}
button{cursor:pointer; border:0;padding:5px 10px;margin:0 20px}
#tabbar {background:#c3d7e5;}
#tabbar button{margin:0}
button{background:#c3d7e5;outline:none;font-weight:bold;color:#2f404d}
button:hover{background:#5d90bc !important;color:#fff}
#tabbar button.active{background:#99afbf}
#imgselect,#webcam {text-align:justify;text-align-last:justify}
#algoSelect{background:#d2e4f0;margin:5px 0;border:solid #5d90bc;border-width:2px 0 2px 0}
a:hover{color:red}
canvas{ /* checkerboard pattern */
background-color: #f8f8f8;
background-image:
linear-gradient(45deg, #e0e0e0 25%, transparent 25%, transparent 75%, #e0e0e0 75%, #e0e0e0),
linear-gradient(45deg, #e0e0e0 25%, transparent 25%, transparent 75%, #e0e0e0 75%, #e0e0e0);
background-size: 40px 40px;
background-position: 0 0, 20px 20px;
}
</style>
<link rel=stylesheet href=range.css>
<div id=sidebar>
<h2>Plotterfun</h2>
<div id=tabbar>
<button id=tab1 onclick='tabImage()'>Image</button><button id=tab2 onclick='tabWebcam()'>Webcam</button>
</div>
<div id=imgselect>
<form>
Canvas
W:<input id=pcw type=number min=10 value=800 oninput='changeSize()'>
H:<input id=pch type=number min=10 value=600 oninput='changeSize()'>
</form>
<canvas></canvas><br>
<button onclick='selectImage()'>Select image</button>
<button onclick='useImage()'>Use image</button>
<button onclick='processFolder()'>Process folder</button>
</div>
<div id=webcam>
<video autoplay></video>
<button onclick='video.paused?video.play():video.pause()'>Pause</button>
<button onclick='snapshot()'>Use image</button>
</div>
<form id=algoSelect>
Algorithm:
<select id=algorithm onchange='loadWorker(this.value)'>
<option value=squiggle.js>Squiggle</option>
<option value=squiggleLeftRight.js>Squiggle Left/Right</option>
<option value=spiral.js>Spiral</option>
<option value=polyspiral.js>Polygon Spiral</option>
<option value=sawtooth.js>Sawtooth</option>
<option value=stipple.js>Stipples</option>
<option value=delaunay.js>Delaunay</option>
<option value=linedraw.js>Linedraw</option>
<option value=mosaic.js>Mosaic</option>
<option value=subline.js>Subline</option>
<option value=springs.js>Springs</option>
<option value=waves.js>Waves</option>
<option value=needles.js>Needles</option>
<option value=implode.js>Implode</option>
<option value=halftone.js title="Algorithm by HomineLudens">Halftone</option>
<option value=boxes.js title="Algorithm by MarkJB">Boxes</option>
<option value=dots.js title="Algorithm by Tim Koop">Dots</option>
<option value=jaggy.js title="Algorithm by Tim Koop">Jaggy</option>
<option value=longwave.js>Longwave</option>
<option value=linescan.js title="Algorithm by J-Waal">Linescan</option>
<option value=woven.js title="Algorithm by J-Waal">Woven</option>
<option value=peano.js title="Algorithm by J-Waal">Peano</option>
</select>
<img id=buffering src=loading.gif style='vertical-align:middle; display:inline-block; visibility:hidden;'>
</form>
<form id=algoParams></form>
<button style='font-size:large; margin:10px' onclick=download()>Download SVG</button>
<div style='padding:10px 15px'>
plotterfun by mitxela<br>
<a href=https://mitxela.com/projects/plotting>more info</a> •
<a href=https://github.com/mitxela/plotterfun>source code</a>
</div>
</div>
<svg></svg>
<div id=msgbox></div>
<script src=helpers.js></script>
<script>
preview=document.querySelector("canvas")
prectx=preview.getContext("2d")
svg=document.querySelector('svg');
video=document.querySelector('video');
canvas=document.createElement("canvas")
ctx=canvas.getContext("2d")
config = {};
img = null;
scale = 1;
offset = [0,0]
// TODO
// Allow editing path display style
// "Animate" button
// plot time estimate
function checkScroll(){
svg.style.position= (window.innerWidth < canvas.width+320 || window.innerHeight < canvas.height+10) ? "absolute" : "fixed";
}
window.onresize=checkScroll;
function changeSize(){
cw = parseInt(pcw.value)
ch = parseInt(pch.value)
preview.width=cw
preview.height=ch
draw()
checkScroll()
}
changeSize()
function tabImage(){
if (video.srcObject && video.srcObject.getTracks().length) video.srcObject.getTracks()[0].stop()
webcam.style.display='none'
imgselect.style.display='block'
tab1.className='active'
tab2.className=''
}
tabImage()
// -----------------------------------------------------------------------
// ---------------------- FOLDER PROCESSING ------------------------------
// -----------------------------------------------------------------------
function save(directoryHandle, fileName){
const svgString = '<?xml version="1.0" standalone="no"?><!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">'
+ (new XMLSerializer()).serializeToString(svg);
const blob = new Blob([svgString], {type: 'image/svg+xml;charset=utf-8'});
writeBlobToDirectory(directoryHandle, fileName, blob)
}
async function writeBlobToDirectory(directoryHandle, fileName, blob) {
try {
// Get a file handle inside the directory
const fileHandle = await directoryHandle.getFileHandle(fileName, { create: true });
// Create a writable stream and write the blob
const writable = await fileHandle.createWritable();
await writable.write(blob);
await writable.close();
console.log(`File saved: ${fileName}`);
} catch (error) {
console.error("Error writing file:", error);
}
}
function selectFolderImage(file) {
console.log("[*] selectFolderImage")
// Create an Image object
img = new Image();
const imageUrl = URL.createObjectURL(file);
img.onload=async function(){
console.log("[*] img.onload "+file.name)
let w=img.width, h=img.height;
cw=parseInt(pcw.defaultValue) // reset size - worth it?
if (w>cw || h>ch) { ch=Math.round(cw*h/w) }
else if (w>10&&h>10){ch=h;cw=w}
preview.height = pch.value = ch
preview.width = pcw.value = cw
scale = Math.min(ch/h, cw/w)
offset = [ cw/2, ch/2 ]
draw()
useImageFolder()
}
img.src = imageUrl;
}
function useImageFolder(){
console.log("[*] useImageFolder")
if (!img) return
imageset=true;
[canvas.width, canvas.height] = [cw, ch];
ctx.fillStyle='#fff'
ctx.fillRect(0,0,cw,ch)
ctx.drawImage(preview, 0,0)
checkScroll()
process()
}
outDirectoryHandle=null
outFilename=null
async function processFolder() {
try {
// Request directory access
const dirHandle = await window.showDirectoryPicker();
// output directiry
outDirectoryHandle = await dirHandle.getDirectoryHandle('output', {
create: true,
});
const images = [];
// Iterate over files in the directory
for await (const entry of dirHandle.values()) {
if (entry.kind === "file") {
const file = await entry.getFile();
outFilename = file.name.replace(/\.[^/.]+$/, "")+".svg"
// Check if the file is an image
if (file.type.startsWith("image/")) {
console.log("Process image:", file.name);
// -------------------------------------
// ---- Select and process 1 image -----
// -------------------------------------
console.log("Select Folder image");
selectFolderImage(file)
}
}
}
//return
} catch (error) {
console.error("Error loading images:", error);
//return [];
}
}
// -------------------------------------------------------------
// -------------------------------------------------------------
// -------------------------------------------------------------
function selectImage(){
// Reset directory states
outDirectoryHandle=null
outFilename=null
let d= document.createElement('input')
d.type='file'
d.onchange=function(e){
img = new Image();
img.onload=function(){
let w=img.width, h=img.height;
cw=parseInt(pcw.defaultValue) // reset size - worth it?
if (w>cw || h>ch) { ch=Math.round(cw*h/w) }
else if (w>10&&h>10){ch=h;cw=w}
preview.height = pch.value = ch
preview.width = pcw.value = cw
scale = Math.min(ch/h, cw/w)
offset = [ cw/2, ch/2 ]
draw()
}
img.src = URL.createObjectURL(e.target.files[0]);
}
d.click()
}
function draw(){
if (!img) return
prectx.clearRect(0,0,cw,ch)
prectx.drawImage(img, offset[0]-scale*img.width*0.5,offset[1]-scale*img.height*0.5, scale*img.width, scale*img.height)
}
preview.onmousedown=function(e){
let dx=e.clientX, dy=e.clientY
let csc = cw / preview.getBoundingClientRect().width
document.onmousemove=function(e){
let x=e.clientX-dx, y=e.clientY-dy
offset[0] += x*csc
offset[1] += y*csc
dx=e.clientX
dy=e.clientY
draw()
return false
}
document.onmouseup=function(){
document.onmousemove=null
document.onmouseup=null
}
return false
}
preview.addEventListener("wheel", function(e){
e.preventDefault();
e.stopPropagation();
let os = scale
scale *= e.deltaY>0 ?1.1:0.9;
offset[0] = ((offset[0] -cw/2)/os)*scale +cw/2
offset[1] = ((offset[1] -ch/2)/os)*scale +ch/2
draw()
},{passive:false});
function tabWebcam(){
if (!navigator.mediaDevices || !navigator.mediaDevices.getUserMedia) {
alert("could not open webcam");
} else
navigator.mediaDevices.getUserMedia({video: {width:800}}).then(function(v) {
video.srcObject = v;
webcam.style.display='block'
imgselect.style.display='none'
tab2.className='active'
tab1.className=''
}).catch((e)=>alert("error opening webcam"));
}
var imageset = false;
function snapshot(){
imageset=true;
// config width height should come from sliders maybe?
[canvas.width, canvas.height] = [video.videoWidth, video.videoHeight];
ctx.drawImage(video, 0, 0)
checkScroll()
process()
}
function useImage(){
if (!img) return
imageset=true;
[canvas.width, canvas.height] = [cw, ch];
ctx.fillStyle='#fff'
ctx.fillRect(0,0,cw,ch)
ctx.drawImage(preview, 0,0)
checkScroll()
process()
}
function sendToWorker(msg){
if (!window.onmessage) myWorker.postMessage(msg)
else setTimeout(()=>window.onmessage({data:msg}),10)
}
function process(){
console.log("[*] process")
if (!imageset) return;
[config.width, config.height] = [canvas.width, canvas.height]
console.log("process : resetSVG")
resetSVG()
console.log("process : loadWorker")
loadWorker(window.algo)
console.log("process : sendWorker")
sendToWorker([ window.config, ctx.getImageData(0,0,config.width,config.height) ]);
}
function ctrlChange(control){
if (!imageset) return;
if (!control.noRestart)
process()
else
sendToWorker([ window.config ]);
}
function addController(control, form){
if (!control.type) control.type = "range"
let s = document.createElement("input")
Object.assign(s, control)
let l = document.createElement('label')
let p = document.createElement('div')
// Don't reset values when reloading controls with same name
if (control.type !='checkbox'){
if (config[control.label]) control.value = config[control.label];
else config[control.label] = control.value;
}
if (control.type=='select') {
s = document.createElement('select')
s.oninput=e=>{config[control.label] = s.value; ctrlChange(control)}
for (let i in control.options) {
let selected = control.options[i]==config[control.label]
s.append(new Option( control.options[i], control.options[i], selected, selected ))
}
l.append(control.label+': ')
l.append(s)
p.append(l)
form.append(p)
return
} else if (control.type=='checkbox') {
if (config[control.label]!==undefined) s.checked = config[control.label]
s.oninput=e=>{config[control.label] = s.checked; ctrlChange(control)}
config[control.label] = s.checked
l.append(s)
} else {
let n = document.createElement('input')
n.type="text" // type=number does not allow fractions
n.pattern="\-?[0-9]+\.?[0-9]*"
s.oninput=e=>{config[control.label] = Number( n.value = s.value ); ctrlChange(control)}
n.oninput=e=>{config[control.label] = Number( s.value = n.value ); ctrlChange(control)}
n.onkeydown=function(e){
if (e.keyCode!=38 && e.keyCode!=40) return;
n.value = parseFloat(n.value) + (e.keyCode==38?1:-1) * (control.step || 1)
// avoid floating point errors like 1.0000001 when step is fractional
if (control.step && control.step != Math.round(control.step))
n.value = parseFloat( (n.value*1).toFixed( control.step.toString().split('.')[1].length ) )
n.oninput()
};
s.value = n.value = config[control.label] //.assign already set value, but value has to be set after min/max are set
p.append(s);
p.append(n)
}
l.append(control.label)
l.append(p)
form.append(l)
}
function appendScript(src) {
var script = document.createElement('script');
script.setAttribute('type', 'text/javascript');
script.setAttribute('src', src);
document.head.append(script);
}
function loadWorker(src){
buffering.style.visibility='visible'
if (window.myWorker) myWorker.terminate()
if ((window.location.protocol == 'file:') ){
// Workers not working - fall back to embedding the script
window.myWorker={terminate:()=>{}}
window.importScripts=function(...args){
for (let a of args) appendScript(a)
}
window.postMessage=function(msg){
myWorker.onmessage({data:msg})
}
appendScript(src)
} else window.myWorker = new Worker(src);
// Directory : set the output directory and output filename
myWorker.outdir=outDirectoryHandle
myWorker.outfile=outFilename
msgbox.innerHTML = "";
myWorker.onmessage = function(msg) {
let [type, data] = msg.data
// setup, declare parameters
if (type == 'sliders') {
buffering.style.visibility='hidden'
if (src==window.algo) return;
window.algo=src
algoParams.innerHTML="";
data.forEach(c=>addController( c, algoParams ))
process()
// message, e.g. progress bar
} else if (type == 'msg') {
msgbox.innerHTML = data;
} else if (type == 'dbg'){
window.data = data
console.log(data)
// vector data result
}else if (type == 'svg-path'){
mainpath.setAttributeNS(null, "d", data)
if(this.outdir){
save(this.outdir, this.outfile)
}
}
}
}
const svgNS = "http://www.w3.org/2000/svg"
function resetSVG(){
// erase existing contents
let c; while (c = svg.firstChild) svg.removeChild(c)
svg.setAttribute("width",config.width)
svg.setAttribute("height",config.height)
svg.setAttribute("viewBox", `0 0 ${config.width} ${config.height}`)
svg.style.background=config.Inverted?"black":"white";
window.mainpath=document.createElementNS(svgNS, "path");
mainpath.setAttributeNS(null, "style", "stroke-width: 2px; fill: none; stroke: " + (config.Inverted?"white":"black"))
svg.appendChild(mainpath)
}
function download(){
const svgString = '<?xml version="1.0" standalone="no"?><!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">'
+ (new XMLSerializer()).serializeToString(svg);
const blob = new Blob([svgString], {type: 'image/svg+xml;charset=utf-8'});
const downloadLink = document.createElement("a");
downloadLink.href = URL.createObjectURL(blob);
downloadLink.download = window.algo.replace('.js','_') + Date.now() + ".svg";
document.body.appendChild(downloadLink);
downloadLink.click();
document.body.removeChild(downloadLink);
}
algorithm.onchange()
</script>