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make-lace.html
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<!DOCTYPE html>
<html>
<head>
<title>Good 'ol lace editor</title>
<style>
#dropTarget {
position:fixed;
left:0;
bottom:0;
width:100%;
height:100%;
background:#ccc;
outline:4px dashed #eee;
outline-offset:-20px;
z-index:100;
visibility:hidden;
}
#dropTarget.active {
visibility:visible;
background:#eee;
outline-color:#ccc;
}
#file {
display:none;
}
#fileLabel span {
cursor:pointer;
text-decoration:underline;
}
</style>
</head>
<body>
<input id="file" type="file" />
<label id="fileLabel" for="file"><span>Choose a lace file</span> or drag one into the window to edit it.</label><br />
<a id="download" href="" download="chart.lace">Save Current Pattern</a><br />
<div style="text-align:center">
<div>
<button type="button" onclick="addTop();">+</button>
<button type="button" onclick="subTop();">-</button>
</div>
<div style="display:flex;justify-content:center;align-items:center;">
<div>
<button type="button" onclick="addLeft();">+</button>
<button type="button" onclick="subLeft();">-</button>
</div>
<canvas id="canvas"></canvas>
<div>
<button type="button" onclick="addRight();">+</button>
<button type="button" onclick="subRight();">-</button>
</div>
</div>
<div>
<button type="button" onclick="addBottom();">+</button>
<button type="button" onclick="subBottom();">-</button>
</div>
</div>
<div id="dropTarget"></div>
<script>
let download = document.getElementById("download");
let canvas = document.getElementById("canvas");
let ctx = canvas.getContext("2d");
const COLOR_BACKGROUND = '#f5e9da'; //'#5a5a5a';
const COLOR_YARN = '#bfa6c9';
const COLOR_OUTLINE = '#291c2a'; //'#fff';
const SCALE = 2;
const BLOCK_WIDTH = 20 * SCALE;
const BLOCK_HEIGHT = 13 * SCALE;
const CROSS_R = 4;
const CROSS_T = 3.5;
const CROSS_L1 = {
x:0.15 * BLOCK_WIDTH,
y:0.5 * BLOCK_HEIGHT - CROSS_R*SCALE,
t1x:CROSS_T*SCALE, t1y:0.0*SCALE,
t2x:0.0*SCALE, t2y:CROSS_T*SCALE,
};
const CROSS_L2 = {
x:0.15 * BLOCK_WIDTH + CROSS_R*SCALE,
y:0.5 * BLOCK_HEIGHT,
t1x:0.0*SCALE, t1y:CROSS_T*SCALE,
t2x:CROSS_T*SCALE, t2y:0.0*SCALE,
};
const CROSS_R1 = {
x:BLOCK_WIDTH-CROSS_L1.x,
y:CROSS_L1.y,
t1x:CROSS_L1.t1x, t1y:-CROSS_L1.t1y,
t2x:CROSS_L1.t2x, t2y:-CROSS_L1.t2y,
};
const CROSS_R2 = {
x:BLOCK_WIDTH-CROSS_L2.x,
y:CROSS_L2.y,
t1x:CROSS_L2.t1x, t1y:-CROSS_L2.t1y,
t2x:CROSS_L2.t2x, t2y:-CROSS_L2.t2y,
};
const YARN_RADIUS = 2;
const OUTER_RADIUS = YARN_RADIUS + 1.5;
let rows = 20;
let columns = 20;
let chart = [];
function refresh() {
columns = 0;
rows = chart.length;
for (let r = 0; r < chart.length; ++r) {
columns = Math.max(columns, chart[r].length);
}
saveChart();
requestDraw();
}
function addLeft() {
for (let r = 0; r < chart.length; ++r) {
chart[r].unshift({stitch:"k", offset:0, first:false});
}
refresh();
}
function addRight() {
for (let r = 0; r < chart.length; ++r) {
chart[r].push({stitch:"k", offset:0, first:false});
}
refresh();
}
function addBottom() {
let row = [];
for (let c = 0; c < columns; ++c) {
row.push({stitch:"k", offset:0, first:false});
}
chart.unshift(row);
refresh();
}
function addTop() {
let row = [];
for (let c = 0; c < columns; ++c) {
row.push({stitch:"k", offset:0, first:false});
}
chart.push(row);
refresh();
}
function subLeft() {
for (let r = 0; r < chart.length; ++r) {
if (chart[r].length > 0) chart[r].shift();
}
refresh();
}
function subRight() {
for (let r = 0; r < chart.length; ++r) {
if (chart[r].length > 0) chart[r].pop();
}
refresh();
}
function subBottom() {
if (chart.length) chart.shift();
refresh();
}
function subTop() {
if (chart.length) chart.pop();
refresh();
}
function loadChart(data) {
chart = [];
rows = 0;
columns = 0;
data.split(/\n/).reverse().forEach(function(line){
console.log("Line: " + line);
//comments:
if (line.indexOf("#") !== -1) {
line = line.substr(0, line.indexOf("#"));
}
var toks = [];
var haveKP = false;
line.split(/\s+/).forEach(function(tok){
if (tok !== "") toks.push(tok);
if (tok.indexOf("k") !== -1 || tok.indexOf("p") !== -1) haveKP = true;
});
if (toks.length === 0) return;
//console.log("Toks: " + toks.join(","));
if (haveKP) {
//knit/purl line!
var row = [];
toks.forEach(function(tok){
if (tok === "k" || tok === "p") {
row.push({stitch:tok, offset:0, first:false});
} else {
console.error("Expecting only k/p in knit line. Got '" + tok + "'.");
throw "Invalid token.";
}
});
chart.push(row);
columns = Math.max(columns, row.length);
rows = chart.length;
} else {
//transfer line!
if (chart.length === 0) {
throw "Transfer row after nothing";
}
var row = chart[chart.length-1];
toks.forEach(function(tok,i){
var m = tok.match(/^([+-]?\d+)([*]?)$/);
if (m === null) {
console.error("Expecting only offsets (possibly with stars) in xfer row. Got '" + tok + "'.");
throw "Invalid token.";
}
if (i >= row.length) {
throw "Transfer row too long";
}
row[i].offset = parseInt(m[1]);
row[i].first = (m[2] === '*');
});
}
});
saveChart();
requestDraw();
}
function saveChart() {
let data = [];
for (let r = 0; r < chart.length; ++r) {
let kp = "";
let xfer = "";
for (let c = 0; c < chart[r].length; ++c) {
let s = chart[r][c];
kp += " " + s.stitch + " ";
if (s.offset < 0) {
xfer += "" + s.offset;
} else if (s.offset > 0) {
xfer += "+" + s.offset;
} else {
xfer += " 0";
}
if (s.first) {
xfer += "* ";
} else {
xfer += " ";
}
}
data.unshift(kp);
data.unshift(xfer);
}
data = data.join("\n");
download.href = "data:text/plain;charset=utf-8," + encodeURIComponent(data);
return data;
}
for (let r = 0; r < rows; ++r) {
let row = [];
for (let c = 0; c < columns; ++c) {
row.push({stitch:"k", offset:0, first:false});
}
chart.push(row);
}
function divide(xA, yA, xB, yB, xC, yC, xD, yD, t = 0.5) {
let xAB = t * (xB - xA) + xA;
let yAB = t * (yB - yA) + yA;
let xBC = t * (xC - xB) + xB;
let yBC = t * (yC - yB) + yB;
let xCD = t * (xD - xC) + xC;
let yCD = t * (yD - yC) + yC;
let xABC = t * (xBC - xAB) + xAB;
let yABC = t * (yBC - yAB) + yAB;
let xBCD = t * (xCD - xBC) + xBC;
let yBCD = t * (yCD - yBC) + yBC;
let xABCD = t * (xBCD - xABC) + xABC;
let yABCD = t * (yBCD - yABC) + yABC;
return [
xA, yA,
xAB, yAB,
xABC, yABC,
xABCD, yABCD,
xBCD, yBCD,
xCD, yCD,
xD, yD
];
}
function draw() {
resize();
ctx.resetTransform();
ctx.fillStyle = COLOR_BACKGROUND;
ctx.fillRect(0,0,canvas.width,canvas.height);
ctx.transform(1,0, 0,-1, 0,canvas.height);
//three sets of yarn curves:
let legs = [];
let rowLoops = [];
let rowFirstLoops = [];
let bandages = [];
for (let r = 0; r < rows; ++r) {
let loops = [];
rowLoops.push(loops);
let firstLoops = [];
rowFirstLoops.push(firstLoops);
for (let c = 0; c < columns; ++c) {
let s = chart[r][c];
let x = BLOCK_WIDTH * c;
let y = BLOCK_HEIGHT * r;
let x2 = BLOCK_WIDTH * (c+s.offset);
let y2 = BLOCK_HEIGHT * (r+1);
legs.push([
x+0,y+CROSS_L1.y,
x+1, y+CROSS_L1.y,
x+CROSS_L1.x-CROSS_L1.t1x, y+CROSS_L1.y-CROSS_L1.t1y,
x+CROSS_L1.x, y+CROSS_L1.y,
x+CROSS_L1.x+CROSS_L1.t1x, y+CROSS_L1.y+CROSS_L1.t1y,
x+CROSS_L2.x-CROSS_L2.t1x, y+CROSS_L2.y-CROSS_L2.t1y,
x+CROSS_L2.x, y+CROSS_L2.y,
]);
legs.push([
x+CROSS_R2.x,y+CROSS_R2.y,
x+CROSS_R2.x+CROSS_R2.t1x, y+CROSS_R2.y+CROSS_R2.t1y,
x+CROSS_R1.x-CROSS_R1.t1x, y+CROSS_R1.y-CROSS_R1.t1y,
x+CROSS_R1.x, y+CROSS_R1.y,
x+CROSS_R1.x+CROSS_R1.t1x, y+CROSS_R1.y+CROSS_R1.t1y,
x+BLOCK_WIDTH-1,y+CROSS_R1.y,
x+BLOCK_WIDTH,y+CROSS_R1.y
]);
(s.first ? firstLoops : loops).push([
x+CROSS_L2.x, y+CROSS_L2.y,
x+CROSS_L2.x+CROSS_L2.t1x, y+CROSS_L2.y+CROSS_L2.t1y,
x2+CROSS_L1.x-CROSS_L1.t2x, y2+CROSS_L1.y-CROSS_L1.t2y,
x2+CROSS_L1.x, y2+CROSS_L1.y,
x2+CROSS_L1.x+CROSS_L1.t2x, y2+CROSS_L1.y+CROSS_L1.t2y,
x2+CROSS_L2.x-CROSS_L2.t2x, y2+CROSS_L2.y-CROSS_L2.t2y,
x2+CROSS_L2.x, y2+CROSS_L2.y,
x2+CROSS_L2.x+CROSS_L2.t2x, y2+CROSS_L2.y+CROSS_L2.t2y,
x2+CROSS_R2.x-CROSS_R2.t2x, y2+CROSS_R2.y-CROSS_R2.t2y,
x2+CROSS_R2.x, y2+CROSS_R2.y,
x2+CROSS_R2.x+CROSS_R2.t2x, y2+CROSS_R2.y+CROSS_R2.t2y,
x2+CROSS_R1.x-CROSS_R1.t2x, y2+CROSS_R1.y-CROSS_R1.t2y,
x2+CROSS_R1.x, y2+CROSS_R1.y,
x2+CROSS_R1.x+CROSS_R1.t2x, y2+CROSS_R1.y+CROSS_R1.t2y,
x+CROSS_R2.x-CROSS_R2.t1x, y+CROSS_R2.y-CROSS_R2.t1y,
x+CROSS_R2.x, y+CROSS_R2.y,
]);
let sL = divide(
x+CROSS_L1.x, y+CROSS_L1.y,
x+CROSS_L1.x+CROSS_L1.t1x, y+CROSS_L1.y+CROSS_L1.t1y,
x+CROSS_L2.x-CROSS_L2.t1x, y+CROSS_L2.y-CROSS_L2.t1y,
x+CROSS_L2.x, y+CROSS_L2.y,
0.5
);
let sR = divide(
x+CROSS_R1.x, y+CROSS_R1.y,
x+CROSS_R1.x-CROSS_R1.t1x, y+CROSS_R1.y-CROSS_R1.t1y,
x+CROSS_R2.x+CROSS_R2.t1x, y+CROSS_R2.y+CROSS_R2.t1y,
x+CROSS_R2.x, y+CROSS_R2.y,
0.5
);
if (s.stitch === "k") {
let halfL = divide(
x+CROSS_L2.x, y+CROSS_L2.y,
x+CROSS_L2.x+CROSS_L2.t1x, y+CROSS_L2.y+CROSS_L2.t1y,
x2+CROSS_L1.x-CROSS_L1.t2x, y2+CROSS_L1.y-CROSS_L1.t2y,
x2+CROSS_L1.x, y2+CROSS_L1.y,
0.3
);
let halfR = divide(
x+CROSS_R2.x, y+CROSS_R2.y,
x+CROSS_R2.x-CROSS_R2.t1x, y+CROSS_R2.y-CROSS_R2.t1y,
x2+CROSS_R1.x+CROSS_R1.t2x, y2+CROSS_R1.y+CROSS_R1.t2y,
x2+CROSS_R1.x, y2+CROSS_R1.y,
0.3
);
bandages.push([
sL[6], sL[7],
sL[8], sL[9],
sL[10], sL[11],
sL[12], sL[13],
halfL[2], halfL[3],
halfL[4], halfL[5],
halfL[6], halfL[7]
]);
bandages.push([
sR[6], sR[7],
sR[8], sR[9],
sR[10], sR[11],
sR[12], sR[13],
halfR[2], halfR[3],
halfR[4], halfR[5],
halfR[6], halfR[7]
]);
} else if (s.stitch === "p") {
bandages.push([
x+0,y+CROSS_L1.y,
x+1, y+CROSS_L1.y,
x+CROSS_L1.x-CROSS_L1.t1x, y+CROSS_L1.y-CROSS_L1.t1y,
sL[0], sL[1],
sL[2], sL[3],
sL[4], sL[5],
sL[6], sL[7],
]);
bandages.push([
x+BLOCK_WIDTH,y+CROSS_R1.y,
x+BLOCK_WIDTH-1, y+CROSS_R1.y,
x+CROSS_R1.x-CROSS_R1.t1x, y+CROSS_R1.y-CROSS_R1.t1y,
sR[0], sR[1],
sR[2], sR[3],
sR[4], sR[5],
sR[6], sR[7],
]);
} else {
//unknown stitch type
}
}
}
function emitSeparate(arr, backCap, frontCap) {
arr.forEach(function(pts){
ctx.beginPath();
console.assert(pts.length % 6 === 2);
ctx.moveTo(pts[0], pts[1]);
for (let i = 2; i + 5 < pts.length; i += 6) {
ctx.bezierCurveTo(pts[i], pts[i+1], pts[i+2], pts[i+3], pts[i+4], pts[i+5]);
}
ctx.lineJoin = 'round';
ctx.lineWidth = 2 * OUTER_RADIUS;
ctx.strokeStyle = COLOR_OUTLINE;
ctx.lineCap = backCap;
ctx.stroke();
ctx.lineWidth = 2 * YARN_RADIUS;
ctx.strokeStyle = COLOR_YARN;
ctx.lineCap = frontCap;
ctx.stroke();
});
};
function emit(arr, backCap, frontCap) {
ctx.beginPath();
arr.forEach(function(pts){
console.assert(pts.length % 6 === 2);
ctx.moveTo(pts[0], pts[1]);
for (let i = 2; i + 5 < pts.length; i += 6) {
ctx.bezierCurveTo(pts[i], pts[i+1], pts[i+2], pts[i+3], pts[i+4], pts[i+5]);
}
});
ctx.lineJoin = 'round';
ctx.lineWidth = 2 * OUTER_RADIUS;
ctx.strokeStyle = COLOR_OUTLINE;
ctx.lineCap = backCap;
ctx.stroke();
ctx.lineWidth = 2 * YARN_RADIUS;
ctx.strokeStyle = COLOR_YARN;
ctx.lineCap = frontCap;
ctx.stroke();
};
emit(legs, 'round', 'round');
for (let r = rows - 1; r >= 0; --r) {
emitSeparate(rowLoops[r], 'butt', 'round');
emitSeparate(rowFirstLoops[r], 'butt', 'round');
}
emit(bandages, 'butt', 'round');
}
function resize() {
canvas.width = columns * BLOCK_WIDTH;
canvas.height = rows * BLOCK_HEIGHT;
canvas.style.width = (canvas.width + "px");
canvas.style.height = (canvas.height + "px");
}
function requestDraw() {
if (requestDraw.requested) return;
requestDraw.requested = true;
window.requestAnimationFrame(function(){
delete requestDraw.requested;
draw();
});
}
var dragging = null;
function getBlock(evt) {
let rect = canvas.getBoundingClientRect();
let x = evt.clientX - rect.left;
let y = rect.bottom - evt.clientY;
let r = Math.floor(y / BLOCK_HEIGHT);
let c = Math.floor(x / BLOCK_WIDTH);
return {r:r, c:c};
}
canvas.addEventListener('mousedown', function(evt){
evt.preventDefault();
dragging = null;
let b = getBlock(evt);
if (b.r < 0 || b.r >= chart.length || b.c < 0 || b.c >= chart[b.r].length) return false;
if (evt.button === 2) {
chart[b.r][b.c].stitch = (chart[b.r][b.c].stitch === "k" ? "p" : "k");
saveChart();
requestDraw();
return false;
}
for (let c = 0; c < chart[b.r].length; ++c) {
if (c + chart[b.r][c].offset === b.c + chart[b.r][b.c].offset) {
chart[b.r][c].first = (c === b.c);
}
}
dragging = b;
saveChart();
requestDraw();
return false;
});
canvas.addEventListener('mousemove', function(evt){
evt.preventDefault();
let b = getBlock(evt);
if (b.r < 0 || b.r >= chart.length || b.c < 0 || b.c >= chart[b.r].length) return false;
if (dragging) {
chart[dragging.r][dragging.c].offset = b.c - dragging.c;
for (let c = 0; c < chart[dragging.r].length; ++c) {
if (c + chart[dragging.r][c].offset === dragging.c + chart[dragging.r][dragging.c].offset) {
chart[dragging.r][c].first = (c === dragging.c);
}
}
saveChart();
requestDraw();
}
return false;
});
canvas.addEventListener('mouseup', function(evt){
evt.preventDefault();
dragging = null;
return false;
});
canvas.addEventListener('contextmenu', function(evt){
evt.preventDefault();
return false;
});
resize();
saveChart();
requestDraw();
//--------------------------------------
//drag/drop stuff:
function readFile(file) {
console.log("Attempting to read file: '" + file.name + "'");
var reader = new FileReader();
reader.onload = function(){
download.download = file.name;
loadChart(reader.result);
}
reader.readAsText(file);
}
var dropTarget = document.getElementById("dropTarget");
//dragging into the window also loads files:
dropTarget.addEventListener('dragover', function(evt){
dropTarget.classList.add("active");
evt.preventDefault();
return false;
});
dropTarget.addEventListener('dragleave', function(evt){
dropTarget.classList.remove("active");
evt.preventDefault();
return false;
});
dropTarget.addEventListener('drop', function(evt){
dropTarget.classList.remove("active");
try {
readFile(evt.dataTransfer.files[0]);
} catch (e) {
console.log(e);
}
evt.preventDefault();
return false;
});
//dragging into the window shows the target:
document.addEventListener('dragover', function(evt){
dropTarget.classList.add("active");
evt.preventDefault();
return false;
});
var file = document.getElementById("file");
file.addEventListener('change', function(evt){
try {
readFile(file.files[0]);
} catch (e) {
console.log(e);
}
evt.preventDefault();
return false;
});
</script>
</body>
</html>