master
km0 3 years ago
commit 36f86f523f

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# Spaghetti Cables
![spaghetti forgetti rigretti svg cables](cover.jpg)
First attempt of using a cable-based interaction for web dasein. Research for the [mod cms](https://pad.xpub.nl/p/modcms) (workin title)
See also the implementation in [panel](https://git.xpub.nl/kamo/panel)!

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// Great resource from https://stackoverflow.com/a/40700068
// Thank you ConnorFan
var strokeWidth = 10;
var bufferSize;
var svgElement = document.getElementById("svgElement");
var rect = svgElement.getBoundingClientRect();
var path = null;
var strPath;
var buffer = []; // Contains the last positions of the mouse cursor
var cable;
const logs = document.getElementById("logs");
class Cable {
start = "";
end = "";
path = "";
color = "";
constructor(start) {
this.start = start;
}
}
svgElement.addEventListener("mousedown", function (e) {
bufferSize = document.getElementById("cmbBufferSize").value;
path = document.createElementNS("http://www.w3.org/2000/svg", "path");
path.setAttribute("fill", "none");
let color = randomColor();
path.setAttribute("stroke", color);
path.setAttribute("stroke-width", strokeWidth);
path.setAttribute("stroke-linecap", "round");
buffer = [];
var pt = getMousePosition(e);
appendToBuffer(pt);
strPath = "M" + pt.x + " " + pt.y;
path.setAttribute("d", strPath);
svgElement.appendChild(path);
let socket = getSocket(pt);
if (socket) {
cable = new Cable(socket.querySelector("input").getAttribute("name"));
cable.color = color;
}
});
svgElement.addEventListener("mousemove", function (e) {
if (path) {
appendToBuffer(getMousePosition(e));
updateSvgPath();
}
});
svgElement.addEventListener("mouseup", function (e) {
if (path) {
let pt = getMousePosition(e);
let socket = getSocket(pt);
if (socket) {
cable.end = socket.querySelector("input").getAttribute("name");
cable.path = path.getAttribute("d");
logCable(cable);
}
path = null;
}
});
svgElement.addEventListener("mouseleave", function (e) {
if (path) {
let pt = getMousePosition(e);
let socket = getSocket(pt);
if (socket) {
cable.end = socket.querySelector("input").getAttribute("name");
cable.path = path.getAttribute("d");
logCable(cable);
}
path = null;
}
});
// ok
var getMousePosition = function (e) {
return {
x: e.pageX - rect.left,
y: e.pageY - rect.top,
};
};
var appendToBuffer = function (pt) {
buffer.push(pt);
while (buffer.length > bufferSize) {
buffer.shift();
}
};
// ok
// Calculate the average point, starting at offset in the buffer
var getAveragePoint = function (offset) {
var len = buffer.length;
if (len % 2 === 1 || len >= bufferSize) {
var totalX = 0;
var totalY = 0;
var pt, i;
var count = 0;
for (i = offset; i < len; i++) {
count++;
pt = buffer[i];
totalX += pt.x;
totalY += pt.y;
}
return {
x: totalX / count,
y: totalY / count,
};
}
return null;
};
// ok
var updateSvgPath = function () {
var pt = getAveragePoint(0);
if (pt) {
// Get the smoothed part of the path that will not change
strPath += " L" + pt.x + " " + pt.y;
// Get the last part of the path (close to the current mouse position)
// This part will change if the mouse moves again
var tmpPath = "";
for (var offset = 2; offset < buffer.length; offset += 2) {
pt = getAveragePoint(offset);
tmpPath += " L" + pt.x + " " + pt.y;
}
// Set the complete current path coordinates
path.setAttribute("d", strPath + tmpPath);
}
};
// ok
var randomColor = function () {
const hue = Math.floor(Math.random() * 360);
const saturation = Math.floor(50 + Math.random() * (50 + 1)) + "%";
const lightness = "75%";
return "hsl(" + hue + ", " + saturation + ", " + lightness + ")";
};
// ok
var getSocket = function (position) {
precision = 8;
size = 24;
const sockets = document.querySelectorAll(".socket");
sock = Array.from(sockets).filter((socket) => {
input = socket.querySelector("input");
return (
position.x >= input.offsetLeft - precision + size / 2 &&
position.x <= input.offsetLeft + precision + size / 2 &&
position.y >= input.offsetTop - precision + size / 2 &&
position.y <= input.offsetTop + precision + size / 2
);
})[0];
return sock;
};
let logCable = function (cable) {
let entry = document.createElement("li");
let marker = document.createElement("span");
marker.classList.add("marker");
marker.style.backgroundColor = cable.color;
entry.appendChild(marker);
let text = document.createElement("span");
text.innerHTML = `connects ${cable.start} with ${cable.end}`;
entry.appendChild(text);
logs.appendChild(entry);
};

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<script src="cables.js" defer></script>
<link rel="stylesheet" href="style.css" />
</head>
<body>
<div id="divSmoothingFactor">
<label for="cmbBufferSize">Smoothing</label>
<select id="cmbBufferSize">
<option value="1">1 - No smoothing</option>
<option value="4">4 - Sharp curves</option>
<option value="8" selected="selected">8 - Smooth curves</option>
<option value="12">12 - Very smooth curves</option>
<option value="16">16 - Super smooth curves</option>
<option value="20">20 - Hyper smooth curves</option>
</select>
</div>
<form class="module">
<svg
xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink"
version="1.1"
id="svgElement"
x="0px"
y="0px"
width="500px"
height="500px"
viewBox="0 0 500 500"
enable-background="new 0 0 500 500"
xml:space="preserve"
></svg>
<div class="left">
<div class="socket">
<input type="text" name="LFO" />
<label for="LFO">LFO</label>
</div>
<div class="socket">
<input type="text" name="ENV" />
<label for="ENV">ENV</label>
</div>
</div>
<div class="right">
<div class="socket">
<input type="text" name="frequency" />
<label for="frequency">Frequency</label>
</div>
<div class="socket">
<input type="text" name="amp" />
<label for="amp">Amp</label>
</div>
</div>
</form>
<ul id="logs"></ul>
</body>
</html>

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* {
box-sizing: border-box;
font-family: 'Courier New', Courier, monospace;
}
:root {
--radius: 2px;
}
.control {
position: relative;
display: inline-flex;
flex-direction: column;
justify-content: center;
align-items: center;
}
.control label {
margin-top: 8px;
}
.control+.control {
margin-left: 8px;
}
.module input[type='submit'] {
position: absolute;
right: 32px;
bottom: 32px;
border: 1px solid currentColor;
background: none;
border-radius: var(--radius);
padding: 4px 8px;
}
.module #name {
position: absolute;
bottom: 32px;
left: 32px;
padding: 4px 8px;
border-radius: var(--radius);
border: 1px solid currentColor;
}
.module {
display: inline-flex;
justify-content: space-between;
position: relative;
min-width: 500px;
min-height: 500px;
border-radius: var(--radius);
padding: 32px;
border: 1px solid currentColor;
margin: 8px;
}
.socket + .socket {
margin-top: 64px;
}
.socket input[type='text'] {
display: inline-block;
width: 24px;
height: 24px;
border-radius: 50%;
border: 1px solid currentColor;
cursor: alias;
position: relative;
z-index: 50;
background: none;
pointer-events: none;
}
#svgElement {
z-index: 10;
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
mix-blend-mode: multiply;
}
#logs {
list-style: none;
margin: 8px;
padding: 0;
}
.marker {
display: inline-block;
margin-right: 8px;
width: 0.75em;
height: 0.75em;
border-radius: 50%;
vertical-align: middle;
}
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