d3-force-limit/dist/d3-force-limit.js.map

A positioning hard limit force type for the d3-force simulation engine.

{"version":3,"file":"d3-force-limit.js","sources":["../src/constant.js","../src/limit.js"],"sourcesContent":["export default function(x) {\n  return function() {\n    return x;\n  };\n}\n","import constant from './constant';\n\nexport default function() {\n  let nDim,\n    nodes,\n    radius = (node => 1),     // accessor: number > 0\n    x0 = (node => -Infinity), // accessor: min X\n    x1 = (node => Infinity),  // accessor: max X\n    y0 = (node => -Infinity), // accessor: min Y\n    y1 = (node => Infinity),  // accessor: max Y\n    z0 = (node => -Infinity), // accessor: min z\n    z1 = (node => Infinity),  // accessor: max z\n    cushionWidth = 0,         // width of the cushion layer that pushes nodes away from boundaries\n    cushionStrength = 0.01;   // intensity of the cushion layer that pushes nodes away from boundaries, in terms of px/tick^2\n\n  function force(alpha) {\n    nodes.forEach(node => {\n      const r = radius(node);\n\n      ['x', 'y', 'z'].slice(0, nDim).forEach(coord => {\n        if (!(coord in node)) { return; }\n\n        const range = { x: [x0, x1], y: [y0, y1], z: [z0, z1] }[coord]\n          .map(accessFn => accessFn(node))\n          .sort((a,b) => a - b);\n\n        // take node radius into account\n        range[0] += r;\n        range[1] -= r;\n\n        const vAttr = `v${coord}`;\n        const v = node[vAttr];\n        const pos = node[coord];\n        const futurePos = pos + v;\n\n        if (futurePos < range[0] || futurePos > range[1]) { // future position out of bounds\n          const isBefore = futurePos < range[0];\n\n          if (pos < range[0] || pos > range[1]) { // already out of bounds\n            if (isBefore === v < 0) {\n              node[vAttr] = 0; // moving outwards, stop its motion\n            }\n            node[coord] = range[isBefore ? 0 : 1]; // move it to the closest edge\n          } else {\n            node[vAttr] = range[isBefore ? 0 : 1] - pos; // will cross the limit, slow it down\n          }\n        }\n\n        if (cushionWidth > 0 && cushionStrength > 0) {\n          // repel from boundaries\n          node[vAttr] += (\n            Math.max(0, 1 - Math.max(0, pos - range[0]) / cushionWidth)\n            - Math.max(0, 1 - Math.max(0, range[1] - pos) / cushionWidth)\n          ) * cushionStrength * alpha;\n        }\n      });\n    });\n  }\n\n  function initialize() {}\n\n  force.initialize = function(initNodes, ...args) {\n    nodes = initNodes;\n    nDim = args.find(arg => [1, 2, 3].includes(arg)) || 2;\n    initialize();\n  };\n\n  force.radius = function(_) {\n    return arguments.length ? (radius = typeof _ === \"function\" ? _ : constant(+_), force) : radius;\n  };\n\n  force.x0 = function(_) {\n    return arguments.length ? (x0 = typeof _ === \"function\" ? _ : constant(+_), force) : x0;\n  };\n\n  force.x1 = function(_) {\n    return arguments.length ? (x1 = typeof _ === \"function\" ? _ : constant(+_), force) : x1;\n  };\n\n  force.y0 = function(_) {\n    return arguments.length ? (y0 = typeof _ === \"function\" ? _ : constant(+_), force) : y0;\n  };\n\n  force.y1 = function(_) {\n    return arguments.length ? (y1 = typeof _ === \"function\" ? _ : constant(+_), force) : y1;\n  };\n\n  force.z0 = function(_) {\n    return arguments.length ? (z0 = typeof _ === \"function\" ? _ : constant(+_), force) : z0;\n  };\n\n  force.z1 = function(_) {\n    return arguments.length ? (z1 = typeof _ === \"function\" ? _ : constant(+_), force) : z1;\n  };\n\n  force.cushionWidth = function(_) {\n    return arguments.length ? (cushionWidth = _, force) : cushionWidth;\n  };\n\n  force.cushionStrength = function(_) {\n    return arguments.length ? (cushionStrength = _, force) : cushionStrength;\n  };\n\n  return 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