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Author Topic: PolyJS  (Read 937 times)

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Offline _iPhoenix_

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Re: PolyJS
« on: May 25, 2018, 07:04:09 am »
I forgot to post my demos! I think this deserves a double post, because they are cool :P

Here's  a demo. The shapes do not have to be triangles!

Code: [Select]
var pJS = new PolyJS(document.getElementById("canvas"));
pJS.canvas.width = 240;
pJS.canvas.height = 240;

function createTriMesh(width, height, triWidth, triHeight, skewFactor) {
  var index = -1,
    horizTris = width / triWidth;
  var skewX = () => (Math.floor(Math.random() * 2) - 1) * Math.floor((triWidth * Math.random()) / skewFactor),
    skewY = () => (Math.floor(Math.random() * 2) - 1) * Math.floor((triHeight * Math.random()) / skewFactor)
  for (var j = 0; j < height; j += triHeight) {
    for (var i = 0; i < width; i += triWidth) {
      var a = i / triWidth,
        b = j / triHeight;
      index++;
      var points = [
        [i + skewX(), j + triHeight + skewY()]
      ];
      if (i) {
        points[0] = {
          attached: [pJS.polygons[pJS.polygons.length - 1], 1]
        };
      }
      if (j) {
        points.push({
          attached: [pJS.polygons[2 * ((b - 1) * horizTris + a)], 0]
        });
        points.push({
          attached: [pJS.polygons[2 * ((b - 1) * horizTris + a) + 1], 1]
        });
      } else {
        points.push([i, j]);
        points.push([i + triWidth, j]);
      }
      var lastPolygon = new pJS.Polygon(points, color(), color());
      new pJS.Polygon([{
          attached: [lastPolygon, 2]
        },
        [i + triWidth + skewX(), j + triHeight + skewY()], {
          attached: [lastPolygon, 0]
        }
      ], color(), color());
    }
  }
  pJS.draw()
}

function color() {
  return "#" + Math.floor(256 * Math.random()).toString(16).padStart(2, 0) + Math.floor(256 * Math.random()).toString(16).padStart(2, 0) + Math.floor(256 * Math.random()).toString(16).padStart(2, 0)
}
createTriMesh(240, 240, 30, 30, 2.5);
Please ignore the low code quality; that demo was made in less than 15 minutes without any planning... x.x

Here's a much more simple example that I posted in SAX/IRC about a week or two ago. It draws two triangles and alters them after a short delay, and it explains how it works better, too.
Code: [Select]
//create a <canvas> element and add it to the page.
var canvas = document.createElement("canvas");
document.body.appendChild(canvas);
//initialize a PolyJS object with the canvas
var pJS = new PolyJS(canvas);
//create a Polygon
var shape1 = new pJS.Polygon([
  [0, 0],
  [0, 100],
  [100, 0]
], "black", "green", true);
//create another Polygon
var shape2 = new pJS.Polygon([{
    attached: [pJS.polygons[0], 1] //attached to the first point in the first Polygon created.
  }, {
    attached: [pJS.polygons[0], 2]
  }, //attached to the 3rd point in the first Polygon created
  [100, 50]
], "black", "red", true);
pJS.draw();

//after a delay of 1/2 second, change two points in the first shape and redraw.
setTimeout(x => {
  var points = shape1.points;
  shape1.setPoint(1, [0, 20]);
  shape1.setPoint(2, [128, 32]);
  pJS.draw(true);
}, 500);
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