webgl-stuff/patchbay.html at main · TheMindVirus/webgl-stuff · GitHub

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<!DOCTYPE html>
<html>
  <head>
    <title>PatchBay[LITE]</title>
    <script>
var canvas = null;
var ctx = null;
var patch =
{
    "X": 16,
    "Y": 16,
    "links": [],
};

window.onload=()=>
{
    canvas = document.getElementsByTagName("canvas")[0];
    canvas.onclick = test;
    canvas.oncontextmenu =(event)=> { event.preventDefault(); test(event); };
    ctx = canvas.getContext("2d");
    draw();
}

window.onresize=()=> { draw(); }

var ix = 0;
var iy = 0;
var test=(event)=>
{
    ix = 1 + parseInt((event.x / canvas.width) * patch.X);
    iy = 1 + parseInt((event.y / canvas.height) * patch.Y);
    if (event.button == 0) { link(ix, iy); }
    if ((event.button == 2) && (event.pointerId == 1)) { tear(ix, iy); }
}

var selected = null;
var link=(x, y)=>
{
    if (!selected)
    {
        selected = [x, y];
    }
    else
    {
        if ((selected[0] != x) || (selected[1] != y))
        {
            patch.links.push([selected, [x, y]]);
        }
        selected = null;
    }
    draw();
}
var last = null;
var tear=(x, y)=>
{
    if (!selected)
    {
        selected = [x, y];
    }
    else
    {
        if ((selected[0] != x) || (selected[1] != y))
        {
            //patch.links.pop([selected, [x, y]]);
            for (var i = 0; i < patch.links.length; ++i)
            {
                if (((patch.links[i][0][0] == x)
                &&   (patch.links[i][0][1] == y)
                &&   (patch.links[i][1][0] == selected[0])
                &&   (patch.links[i][1][1] == selected[1]))
                ||  ((patch.links[i][0][0] == selected[0])
                &&   (patch.links[i][0][1] == selected[1])
                &&   (patch.links[i][1][0] == x)
                &&   (patch.links[i][1][1] == y)))
                {
                    patch.links.splice(i, 1);
                }
            }
        }
        selected = null;
    }
    draw();
}

var rect = null;
var size=()=>
{
    rect = window.getComputedStyle(canvas);
    canvas.width = parseFloat(rect.width);
    canvas.height = parseFloat(rect.height);
}
var draw=()=>
{
    size();

    ctx.fillStyle = "#7F7F7F7F";
    ctx.strokeStyle = "#FF00407F";
    var cx = 0;
    var cy = 0;
    var ow = canvas.width / patch.X;
    var oh = canvas.height / patch.Y;
    var hw = ow / 2.0;
    var hh = oh / 2.0;
    var qw = hw / 2.0;
    var qh = hh / 2.0;
    var nn = patch.X * patch.Y;
    for (var i = 0; i < nn; ++i)
    {
        cx = (parseInt(i % patch.X) * ow) + qw;
        cy = (parseInt(i / patch.Y) * oh) + qh;
        ctx.fillRect(cx, cy, hw, hh);
    }

    ctx.lineWidth = 20.0;
    ctx.lineCap = "round";
    var nl = patch.links.length;
    for (var i = 0; i < nl; ++i)
    {
        try
        {
            ctx.moveTo(((patch.links[i][0][0] - 1) * ow) + hw, ((patch.links[i][0][1] - 1) * oh) + hh);
            ctx.lineTo(((patch.links[i][1][0] - 1) * ow) + hw, ((patch.links[i][1][1] - 1) * oh) + hh);
            ctx.stroke();
        }
        catch (error) { console.log(error); }
    }

    if (selected)
    {
        try
        {
            cx = parseInt((selected[0] - 1) * ow) + qw;
            cy = parseInt((selected[1] - 1) * oh) + qh;
            ctx.fillRect(cx, cy, hw, hh);
        }
        catch (error) { console.log(error); }
    }
}
    </script>
    <style>
      * { background: #101010FF; }
      canvas { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }
    </style>
  </head>
  <body>
    <canvas/>
    <button id="load">Load</button>
    <button id="save">Save</button>
  </body>
</html>