modeling/src/geometries/geom2/toCompactBinary.js

  1. /**
  2.  * Produces a compact binary representation from the given geometry.
  3.  * @param {geom2} geometry - the geometry
  4.  * @returns {TypedArray} compact binary representation
  5.  * @alias module:modeling/geometries/geom2.toCompactBinary
  6.  */
  7. const toCompactBinary = (geometry) => {
  8.   const sides = geometry.sides
  9.   const transforms = geometry.transforms
  10.   let color = [-1, -1, -1, -1]
  11.   if (geometry.color) color = geometry.color
  13.   // FIXME why Float32Array?
  14.   const compacted = new Float32Array(1 + 16 + 4 + (sides.length * 4)) // type + transforms + color + sides data
  16.   compacted[0] = 0 // type code: 0 => geom2, 1 => geom3 , 2 => path2
  18.   compacted[1] = transforms[0]
  19.   compacted[2] = transforms[1]
  20.   compacted[3] = transforms[2]
  21.   compacted[4] = transforms[3]
  22.   compacted[5] = transforms[4]
  23.   compacted[6] = transforms[5]
  24.   compacted[7] = transforms[6]
  25.   compacted[8] = transforms[7]
  26.   compacted[9] = transforms[8]
  27.   compacted[10] = transforms[9]
  28.   compacted[11] = transforms[10]
  29.   compacted[12] = transforms[11]
  30.   compacted[13] = transforms[12]
  31.   compacted[14] = transforms[13]
  32.   compacted[15] = transforms[14]
  33.   compacted[16] = transforms[15]
  35.   compacted[17] = color[0]
  36.   compacted[18] = color[1]
  37.   compacted[19] = color[2]
  38.   compacted[20] = color[3]
  40.   for (let i = 0; i < sides.length; i++) {
  41.     const ci = i * 4 + 21
  42.     const point0 = sides[i][0]
  43.     const point1 = sides[i][1]
  44.     compacted[ci + 0] = point0[0]
  45.     compacted[ci + 1] = point0[1]
  46.     compacted[ci + 2] = point1[0]
  47.     compacted[ci + 3] = point1[1]
  48.   }
  49.   // TODO: how about custom properties or fields ?
  50.   return compacted
  51. }
  53. module.exports = toCompactBinary