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main.htm
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Plotterfun color</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:2px; line-height:1.6em}
#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}
#imgSelect{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;
}
#body { resize: both;
-webkit-transform: scale(0.8);
-moz-transform: scale(0.8);
-ms-transform: scale(0.8);
-o-transform: scale(0.8);
transform: scale(0.8);
-webkit-transform-origin: left top 0;
-moz-transform-origin: left top 0;
-ms-transform-origin: left top 0;
-o-transform-origin: left top 0;
transform-origin: left top 0;
}
</style>
<link rel=stylesheet href=range.css>
</head>
<body id=body onload='preset("test.jpg")'>
<div id=sidebar>
<h2>Plotterfun color</h2>
<div id=tabbar>
<button id=tab1 onclick='tabImage()'>Image</button><button id=tab2 onclick='tabWebcam()'>Webcam</button>
</div>
<div id=imgselect title="You can drag and drop images here">
<form>
<table>
<tr><td>Canvas:</td><td>W:<input id=pcw type=number min=10 value=800 oninput='changeSize()'>px </td>
<td>H:<input id=pch type=number min=10 value=600 oninput='changeSize()'>px</td></tr>
<!-- <tr><td>Output:</td><td>W:<input id=pcwm type=number min=10 value=40 oninput='changeSize()'>mm</td>
<td>H:<input id=pchm type=number min=10 value=30 oninput='changeSize()'>mm</td></tr>
--> </table>
</form>
<canvas></canvas><br>
<button onclick='selectImage()'>Select image</button>
<button onclick='useImage()'>Use image</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=imgSelect>
Examples:
<select id=examples onchange='preset(this.value)'>
<option value=image_testpattern.jpg>TV test pattern</option>
<option value=image_graphic_grbl.svg>grbl sign</option>
<option value=image_modell.png>GRBL-Plotter</option>
<option value=image_flying_devil.png>Flying devil</option>
<option value=image_cent.bmp>Cent</option>
</select>
</form>
<div id=colormode>
Color mode:<br>
<input type="radio" id="cmy" name="colorMode" value="CMY" onclick='update()' checked title="Cyan, Magenta, Yellow as for printers">
<label for="cmy" title="Cyan, Magenta, Yellow as for printers"> CMY</label>
<input type="checkbox" id="cmyk" name="colorModeCMYK" value="CMY" onclick='update()' checked title=" and Black">
<label for="cmyk" title=" and Black"> ...and K</label> <br>
<input type="radio" id="rgb" name="colorMode" value="RGB" onclick='update()' title="Red, Green, Blue as for monitors">
<label for="rgb" title="Red, Green, Blue as for monitors"> RGB</label>
</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>Halftone</option>
<option value=boxes.js>Boxes</option>
<option value=dots.js>Dots</option>
<option value=jaggy.js>Jaggy</option>
<option value=longwave.js>Longwave</option>
</select>
<img id=buffering src=loading.gif style='vertical-align:middle; display:none'>
</form>
<form id=algoParams></form>
<button style='font-size:large; width: 250px; margin:10px' onclick=download()>Download SVG</button>
<button style='font-size:large; width: 250px; margin:10px' onclick=copytoclipboard()>Copy SVG to clipboard</button><br>
<div style='padding:10px 15px;'>
plotterfun by mitxela<br>
<a href=https://mitxela.com/projects/plotting>more info</a> •
<a href=https://github.com/svenhb/plotterfun-color>source code</a>
</div>
</div>
<svg></svg>
<div id=msgbox></div>
<!-- a spacer gif -->
<img src="https://grbl-plotter.de/plugins/hitcount/ping/ping.php?from=plotterfun-color" />
<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")
canvas_c=document.createElement("canvas")
canvas_m=document.createElement("canvas")
canvas_y=document.createElement("canvas")
canvas_k=document.createElement("canvas")
ctx=canvas.getContext("2d")
ctx_c=canvas_c.getContext("2d")
ctx_m=canvas_m.getContext("2d")
ctx_y=canvas_y.getContext("2d")
ctx_k=canvas_k.getContext("2d")
color_selector = 'c'
config = {};
img = null;
scale = 1;
offset = [0,0]
imgData = null;
modeRGB = false;
modeK = true;
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()
function preset(source){
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
// pchm.value = pcwm.value * ch/cw;
scale = Math.min(ch/h, cw/w)
offset = [ cw/2, ch/2 ]
draw()
setTimeout(useImage, 500);
}
img.src = source;//'test.jpg'; //'https://grbl-plotter.de/plotterfun/grbl.jpg';
}
function selectImage(){
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
// pchm.value = pcwm.value * cw/ch;
scale = Math.min(ch/h, cw/w)
offset = [ cw/2, ch/2 ]
draw()
}
img.src = URL.createObjectURL(e.target.files[0]);
}
d.click()
}
/** Drag & Drop https://wiki.selfhtml.org/wiki/JavaScript/File_Upload#Auswahl_mit_Drag_und_Drop ****/
function dateiauswahl(evt) {
evt.stopPropagation();
evt.preventDefault();
var gewaehlteDateien = evt.dataTransfer.files; // FileList Objekt
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(gewaehlteDateien[0]);
}
function handleDragOver(evt) {
evt.stopPropagation();
evt.preventDefault();
evt.dataTransfer.dropEffect = 'copy';
}
// Initialisiere Drag&Drop EventListener
var dropZone = document.getElementById('imgselect');
dropZone.addEventListener('dragover', handleDragOver, false);
dropZone.addEventListener('drop', dateiauswahl, false);
/*********************/
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);
imgData = ctx.getImageData(0, 0, video.videoWidth, video.videoHeight);
[canvas_c.width, canvas_c.height] = [video.videoWidth, video.videoHeight];
[canvas_m.width, canvas_m.height] = [video.videoWidth, video.videoHeight];
[canvas_y.width, canvas_y.height] = [video.videoWidth, video.videoHeight];
[canvas_k.width, canvas_k.height] = [video.videoWidth, video.videoHeight];
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);
imgData = ctx.getImageData(0, 0, cw, ch);
[canvas_c.width, canvas_c.height] = [cw, ch];
[canvas_m.width, canvas_m.height] = [cw, ch];
[canvas_y.width, canvas_y.height] = [cw, ch];
[canvas_k.width, canvas_k.height] = [cw, ch];
checkScroll();
process();
}
function byteRange (a) {
if (a > 255) {a = 255; }
if (a < 0) { a = 0; }
return Math.floor(a);
}
function applyFilter (channel, context) { // https://wiki.selfhtml.org/wiki/JavaScript/Canvas/Pixel_Manipulation
var data, mod, x, y, offset;
var r,g,b,k,c,m,yl;
mod = context.createImageData(cw, ch);
for (x = 0; x < cw; x++) {
for (y = 0; y < ch; y++) {
offset = (cw * y + x) * 4;
if ((channel < 0) || (channel > 3)) {
mod.data[offset] = imgData.data[offset];
mod.data[offset + 1] = imgData.data[offset + 1];
mod.data[offset + 2] = imgData.data[offset + 2];
mod.data[offset + 3] = imgData.data[offset + 3];
}
else {
if (modeRGB) {
if (channel > 2) channel = 2;
mod.data[offset] = mod.data[offset + 1] = mod.data[offset + 2] = 255 - imgData.data[offset + channel];
} else {
r = imgData.data[offset] / 255; // https://stackdev.io/question/1077/convert-rgb-to-cmyk
g = imgData.data[offset + 1] / 255;
b = imgData.data[offset + 2] / 255;
k = Math.min(1 - r, Math.min(1 - g, 1 - b));
if (k == 1) {
c = m = yl = 0;
} else {
c = (1 - r - k) / (1 - k);
m = (1 - g - k) / (1 - k);
yl = (1 - b - k) / (1 - k);
}
if (channel == 3) {
mod.data[offset] = mod.data[offset + 1] = mod.data[offset + 2] = 255 - byteRange(k * 255);
} else {
mod.data[offset] = byteRange(c * 255);
mod.data[offset + 1] = byteRange(m * 255);
mod.data[offset + 2] = byteRange(yl * 255);
mod.data[offset] = mod.data[offset + 1] = mod.data[offset + 2] = 255 - mod.data[offset + channel];
}
}
mod.data[offset + 3] = 255;
}
}
}
context.putImageData(mod, 0, 0);
}
function update() {
modeRGB = rgb.checked;
modeK = cmyk.checked;
process();
}
function sendToWorker(msg){
if (!window.onmessage) myWorker.postMessage(msg)
else setTimeout(()=>window.onmessage({data:msg}),10)
}
function process(){
if (!imageset) return;
[config.width, config.height] = [canvas.width, canvas.height];
modeRGB = rgb.checked;
modeK = cmyk.checked;
applyFilter(0,ctx_c);
applyFilter(1,ctx_m);
applyFilter(2,ctx_y);
if (!modeRGB) applyFilter(3,ctx_k);
resetSVG();
loadWorker(window.algo);
color_selector = 'c';
sendToWorker([ window.config, ctx_c.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)
form.append(l)
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.display='inline-block'
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);
msgbox.innerHTML = "";
myWorker.onmessage = function(msg) {
let [type, data] = msg.data;
// setup, declare parameters
if (type == 'sliders') {
buffering.style.display='none';
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'){
if (color_selector == 'c')
{ mainpath_c.setAttributeNS(null, "d", data);
color_selector = 'm';
setTimeout(sendToWorker([ window.config, ctx_m.getImageData(0,0,config.width,config.height) ]),10);
}
else if (color_selector == 'm')
{ mainpath_m.setAttributeNS(null, "d", data);
color_selector = 'y';
sendToWorker([ window.config, ctx_y.getImageData(0,0,config.width,config.height) ]);
}
else if (color_selector == 'y')
{ mainpath_y.setAttributeNS(null, "d", data);
if (!modeRGB) {
color_selector = 'k';
sendToWorker([ window.config, ctx_k.getImageData(0,0,config.width,config.height) ]);
}
// setTimeout(createlink, 500); // doesn't work
}
else if (color_selector == 'k')
{ mainpath_k.setAttributeNS(null, "d", data);}
}
}
}
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",pcwm.value+"mm");
// svg.setAttribute("height",pchm.value+"mm");
svg.setAttribute("width",config.width);
svg.setAttribute("height",config.height);
// svg.setAttribute("viewBox", '0 0 '+pcwm.value+'mm '+pchm.value+'mm');
svg.setAttribute("viewBox", `0 0 ${config.width} ${config.height}`);
svg.style.background=config.Inverted?"black":"white";
// window.mainpath=document.createElementNS(svgNS, "path");
window.mainpath_c=document.createElementNS(svgNS, "path"); // cyan
window.mainpath_m=document.createElementNS(svgNS, "path"); // magenta
window.mainpath_y=document.createElementNS(svgNS, "path"); // yellow
window.mainpath_k=document.createElementNS(svgNS, "path"); // yellow
mainpath_k.setAttributeNS(null, "id", "black");
mainpath_k.setAttributeNS(null, "style", "stroke:" + (config.Inverted?"black":"black")+";stroke-width:0.2mm;fill:none;");
if (modeRGB) {
mainpath_c.setAttributeNS(null, "id", "red");
mainpath_m.setAttributeNS(null, "id", "green");
mainpath_y.setAttributeNS(null, "id", "blue");
mainpath_c.setAttributeNS(null, "style", "stroke:" + (config.Inverted?"cyan":"red")+";stroke-width:0.2mm;fill:none;");
mainpath_m.setAttributeNS(null, "style", "stroke:" + (config.Inverted?"magenta":"green")+";stroke-width:0.2mm;fill:none;");
mainpath_y.setAttributeNS(null, "style", "stroke:" + (config.Inverted?"yellow":"blue")+";stroke-width:0.2mm;fill:none;");
} else {
mainpath_c.setAttributeNS(null, "id", "cyan");
mainpath_m.setAttributeNS(null, "id", "magenta");
mainpath_y.setAttributeNS(null, "id", "yellow");
mainpath_c.setAttributeNS(null, "style", "stroke:" + (config.Inverted?"red":"cyan")+";stroke-width:0.2mm;fill:none;");
mainpath_m.setAttributeNS(null, "style", "stroke:" + (config.Inverted?"green":"magenta")+";stroke-width:0.2mm;fill:none;");
mainpath_y.setAttributeNS(null, "style", "stroke:" + (config.Inverted?"blue":"yellow")+";stroke-width:0.2mm;fill:none;");
}
mainpath_m.setAttributeNS(null, "transform", "translate(1,1)");
mainpath_y.setAttributeNS(null, "transform", "translate(2,2)");
mainpath_k.setAttributeNS(null, "transform", "translate(3,3)");
svg.appendChild(mainpath_c);
svg.appendChild(mainpath_m);
svg.appendChild(mainpath_y);
if (!modeRGB && modeK) svg.appendChild(mainpath_k);
}
function createlink(){ // https://stackoverflow.com/questions/12255444/copy-svg-images-from-browser-to-clipboard
const svgString = (new XMLSerializer()).serializeToString(svg);
link.href="data:image/svg;base64,"+btoa(svgString);
}
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).replace(/</g,"\r\n<");
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);
}
function copytoclipboard(){
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">\r\n'
+ (new XMLSerializer()).serializeToString(svg).replace(/</g,"\r\n<");
navigator.clipboard.writeText(svgString);
}
algorithm.onchange()
</script>
</body>
</html>