js-angusj-clipper
Version:
Polygon and line clipping and offsetting library for Javascript / Typescript - a port of Angus Johnson's clipper to WebAssembly / Asm.JS
297 lines • 35.5 kB
JavaScript
;
var __values = (this && this.__values) || function(o) {
var s = typeof Symbol === "function" && Symbol.iterator, m = s && o[s], i = 0;
if (m) return m.call(o);
if (o && typeof o.length === "number") return {
next: function () {
if (o && i >= o.length) o = void 0;
return { value: o && o[i++], done: !o };
}
};
throw new TypeError(s ? "Object is not iterable." : "Symbol.iterator is not defined.");
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.scalePaths = exports.scalePath = exports.simplifyPolygons = exports.simplifyPolygon = exports.reversePaths = exports.reversePath = exports.polyTreeToPaths = exports.pointInPolygon = exports.orientation = exports.openPathsFromPolyTree = exports.minkowskiSumPaths = exports.minkowskiSumPath = exports.minkowskiDiff = exports.closedPathsFromPolyTree = exports.cleanPolygons = exports.cleanPolygon = exports.area = void 0;
var enums_1 = require("./enums");
var nativeEnumConversion_1 = require("./native/nativeEnumConversion");
var PathsToNativePaths_1 = require("./native/PathsToNativePaths");
var PathToNativePath_1 = require("./native/PathToNativePath");
function tryDelete() {
var e_1, _a;
var objs = [];
for (var _i = 0; _i < arguments.length; _i++) {
objs[_i] = arguments[_i];
}
try {
for (var objs_1 = __values(objs), objs_1_1 = objs_1.next(); !objs_1_1.done; objs_1_1 = objs_1.next()) {
var obj = objs_1_1.value;
if (!obj.isDeleted()) {
obj.delete();
}
}
}
catch (e_1_1) { e_1 = { error: e_1_1 }; }
finally {
try {
if (objs_1_1 && !objs_1_1.done && (_a = objs_1.return)) _a.call(objs_1);
}
finally { if (e_1) throw e_1.error; }
}
}
function area(path) {
// we use JS since copying structures is slower than actually doing it
var cnt = path.length;
if (cnt < 3) {
return 0;
}
var a = 0;
for (var i = 0, j = cnt - 1; i < cnt; ++i) {
a += (path[j].x + path[i].x) * (path[j].y - path[i].y);
j = i;
}
return -a * 0.5;
}
exports.area = area;
function cleanPolygon(nativeLib, path, distance) {
if (distance === void 0) { distance = 1.1415; }
var nativePath = (0, PathToNativePath_1.pathToNativePath)(nativeLib, path);
try {
nativeLib.cleanPolygon(nativePath, distance);
return (0, PathToNativePath_1.nativePathToPath)(nativeLib, nativePath, true); // frees nativePath
}
finally {
tryDelete(nativePath);
}
}
exports.cleanPolygon = cleanPolygon;
function cleanPolygons(nativeLib, paths, distance) {
if (distance === void 0) { distance = 1.1415; }
var nativePaths = (0, PathsToNativePaths_1.pathsToNativePaths)(nativeLib, paths);
try {
nativeLib.cleanPolygons(nativePaths, distance);
return (0, PathsToNativePaths_1.nativePathsToPaths)(nativeLib, nativePaths, true); // frees nativePath
}
finally {
tryDelete(nativePaths);
}
}
exports.cleanPolygons = cleanPolygons;
function addPolyNodeToPaths(polynode, nt, paths) {
var match = true;
switch (nt) {
case 1 /* NodeType.Open */:
return;
case 2 /* NodeType.Closed */:
match = !polynode.isOpen;
break;
default:
break;
}
if (polynode.contour.length > 0 && match) {
paths.push(polynode.contour);
}
for (var ii = 0, max = polynode.childs.length; ii < max; ii++) {
var pn = polynode.childs[ii];
addPolyNodeToPaths(pn, nt, paths);
}
}
function closedPathsFromPolyTree(polyTree) {
// we do this in JS since copying path is more expensive than just doing it
var result = [];
// result.Capacity = polytree.Total;
addPolyNodeToPaths(polyTree, 2 /* NodeType.Closed */, result);
return result;
}
exports.closedPathsFromPolyTree = closedPathsFromPolyTree;
function minkowskiDiff(nativeLib, poly1, poly2) {
var nativePath1 = (0, PathToNativePath_1.pathToNativePath)(nativeLib, poly1);
var nativePath2 = (0, PathToNativePath_1.pathToNativePath)(nativeLib, poly2);
var outNativePaths = new nativeLib.Paths();
try {
nativeLib.minkowskiDiff(nativePath1, nativePath2, outNativePaths);
tryDelete(nativePath1, nativePath2);
return (0, PathsToNativePaths_1.nativePathsToPaths)(nativeLib, outNativePaths, true); // frees outNativePaths
}
finally {
tryDelete(nativePath1, nativePath2, outNativePaths);
}
}
exports.minkowskiDiff = minkowskiDiff;
function minkowskiSumPath(nativeLib, pattern, path, pathIsClosed) {
var patternNativePath = (0, PathToNativePath_1.pathToNativePath)(nativeLib, pattern);
var nativePath = (0, PathToNativePath_1.pathToNativePath)(nativeLib, path);
var outNativePaths = new nativeLib.Paths();
try {
nativeLib.minkowskiSumPath(patternNativePath, nativePath, outNativePaths, pathIsClosed);
tryDelete(patternNativePath, nativePath);
return (0, PathsToNativePaths_1.nativePathsToPaths)(nativeLib, outNativePaths, true); // frees outNativePaths
}
finally {
tryDelete(patternNativePath, nativePath, outNativePaths);
}
}
exports.minkowskiSumPath = minkowskiSumPath;
function minkowskiSumPaths(nativeLib, pattern, paths, pathIsClosed) {
// TODO: im not sure if for this method we can reuse the input/output path
var patternNativePath = (0, PathToNativePath_1.pathToNativePath)(nativeLib, pattern);
var nativePaths = (0, PathsToNativePaths_1.pathsToNativePaths)(nativeLib, paths);
try {
nativeLib.minkowskiSumPaths(patternNativePath, nativePaths, nativePaths, pathIsClosed);
tryDelete(patternNativePath);
return (0, PathsToNativePaths_1.nativePathsToPaths)(nativeLib, nativePaths, true); // frees nativePaths
}
finally {
tryDelete(patternNativePath, nativePaths);
}
}
exports.minkowskiSumPaths = minkowskiSumPaths;
function openPathsFromPolyTree(polyTree) {
// we do this in JS since copying path is more expensive than just doing it
var result = [];
var len = polyTree.childs.length;
result.length = len;
var resultLength = 0;
for (var i = 0; i < len; i++) {
if (polyTree.childs[i].isOpen) {
result[resultLength++] = polyTree.childs[i].contour;
}
}
result.length = resultLength;
return result;
}
exports.openPathsFromPolyTree = openPathsFromPolyTree;
function orientation(path) {
return area(path) >= 0;
}
exports.orientation = orientation;
function pointInPolygon(point, path) {
// we do this in JS since copying path is more expensive than just doing it
// returns 0 if false, +1 if true, -1 if pt ON polygon boundary
// See "The Point in Polygon Problem for Arbitrary Polygons" by Hormann & Agathos
// http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.88.5498&rep=rep1&type=pdf
var result = 0;
var cnt = path.length;
if (cnt < 3) {
return 0;
}
var ip = path[0];
for (var i = 1; i <= cnt; ++i) {
var ipNext = i === cnt ? path[0] : path[i];
if (ipNext.y === point.y) {
if (ipNext.x === point.x || (ip.y === point.y && ipNext.x > point.x === ip.x < point.x)) {
return -1;
}
}
if (ip.y < point.y !== ipNext.y < point.y) {
if (ip.x >= point.x) {
if (ipNext.x > point.x) {
result = 1 - result;
}
else {
var d = (ip.x - point.x) * (ipNext.y - point.y) - (ipNext.x - point.x) * (ip.y - point.y);
if (d === 0) {
return -1;
}
else if (d > 0 === ipNext.y > ip.y) {
result = 1 - result;
}
}
}
else {
if (ipNext.x > point.x) {
var d = (ip.x - point.x) * (ipNext.y - point.y) - (ipNext.x - point.x) * (ip.y - point.y);
if (d === 0) {
return -1;
}
else if (d > 0 === ipNext.y > ip.y) {
result = 1 - result;
}
}
}
}
ip = ipNext;
}
return result;
}
exports.pointInPolygon = pointInPolygon;
function polyTreeToPaths(polyTree) {
// we do this in JS since copying path is more expensive than just doing it
var result = [];
// result.Capacity = polytree.total;
addPolyNodeToPaths(polyTree, 0 /* NodeType.Any */, result);
return result;
}
exports.polyTreeToPaths = polyTreeToPaths;
function reversePath(path) {
// we use JS since copying structures is slower than actually doing it
path.reverse();
}
exports.reversePath = reversePath;
function reversePaths(paths) {
// we use JS since copying structures is slower than actually doing it
for (var i = 0, max = paths.length; i < max; i++) {
reversePath(paths[i]);
}
}
exports.reversePaths = reversePaths;
function simplifyPolygon(nativeLib, path, fillType) {
if (fillType === void 0) { fillType = enums_1.PolyFillType.EvenOdd; }
var nativePath = (0, PathToNativePath_1.pathToNativePath)(nativeLib, path);
var outNativePaths = new nativeLib.Paths();
try {
nativeLib.simplifyPolygon(nativePath, outNativePaths, (0, nativeEnumConversion_1.polyFillTypeToNative)(nativeLib, fillType));
tryDelete(nativePath);
return (0, PathsToNativePaths_1.nativePathsToPaths)(nativeLib, outNativePaths, true); // frees outNativePaths
}
finally {
tryDelete(nativePath, outNativePaths);
}
}
exports.simplifyPolygon = simplifyPolygon;
function simplifyPolygons(nativeLib, paths, fillType) {
if (fillType === void 0) { fillType = enums_1.PolyFillType.EvenOdd; }
var nativePaths = (0, PathsToNativePaths_1.pathsToNativePaths)(nativeLib, paths);
try {
nativeLib.simplifyPolygonsOverwrite(nativePaths, (0, nativeEnumConversion_1.polyFillTypeToNative)(nativeLib, fillType));
return (0, PathsToNativePaths_1.nativePathsToPaths)(nativeLib, nativePaths, true); // frees nativePaths
}
finally {
tryDelete(nativePaths);
}
}
exports.simplifyPolygons = simplifyPolygons;
function scalePath(path, scale) {
var len = path.length;
var sol = [];
sol.length = path.length;
for (var i = 0; i < len; i++) {
var p = path[i];
sol[i] = {
x: Math.round(p.x * scale),
y: Math.round(p.y * scale),
};
}
return sol;
}
exports.scalePath = scalePath;
/**
* Scales all inner paths by multiplying all its coordinates by a number and then rounding them.
*
* @param paths - Paths to scale
* @param scale - Scale multiplier
* @return {Paths} - The scaled paths
*/
function scalePaths(paths, scale) {
if (scale === 0) {
return [];
}
var len = paths.length;
var sol = [];
sol.length = len;
for (var i = 0; i < len; i++) {
sol[i] = scalePath(paths[i], scale);
}
return sol;
}
exports.scalePaths = scalePaths;
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return 0;\n  }\n  let a = 0;\n  for (let i = 0, j = cnt - 1; i < cnt; ++i) {\n    a += (path[j].x + path[i].x) * (path[j].y - path[i].y);\n    j = i;\n  }\n  return -a * 0.5;\n}\n\nexport function cleanPolygon(\n  nativeLib: NativeClipperLibInstance,\n  path: ReadonlyPath,\n  distance = 1.1415\n): Path {\n  const nativePath = pathToNativePath(nativeLib, path);\n  try {\n    nativeLib.cleanPolygon(nativePath, distance);\n    return nativePathToPath(nativeLib, nativePath, true); // frees nativePath\n  } finally {\n    tryDelete(nativePath);\n  }\n}\n\nexport function cleanPolygons(\n  nativeLib: NativeClipperLibInstance,\n  paths: ReadonlyPaths,\n  distance = 1.1415\n): Paths {\n  const nativePaths = pathsToNativePaths(nativeLib, paths);\n  try {\n    nativeLib.cleanPolygons(nativePaths, distance);\n    return nativePathsToPaths(nativeLib, nativePaths, true); // frees nativePath\n  } finally {\n    tryDelete(nativePaths);\n  }\n}\n\nconst enum NodeType {\n  Any,\n  Open,\n  Closed,\n}\n\nfunction addPolyNodeToPaths(polynode: PolyNode, nt: NodeType, paths: ReadonlyPath[]): void {\n  let match = true;\n  switch (nt) {\n    case NodeType.Open:\n      return;\n    case NodeType.Closed:\n      match = !polynode.isOpen;\n      break;\n    default:\n      break;\n  }\n\n  if (polynode.contour.length > 0 && match) {\n    paths.push(polynode.contour);\n  }\n  for (let ii = 0, max = polynode.childs.length; ii < max; ii++) {\n    const pn = polynode.childs[ii];\n    addPolyNodeToPaths(pn, nt, paths);\n  }\n}\n\nexport function closedPathsFromPolyTree(polyTree: PolyTree): Paths {\n  // we do this in JS since copying path is more expensive than just doing it\n\n  const result: Paths = [];\n  // result.Capacity = polytree.Total;\n  addPolyNodeToPaths(polyTree, NodeType.Closed, result);\n  return result;\n}\n\nexport function minkowskiDiff(\n  nativeLib: NativeClipperLibInstance,\n  poly1: ReadonlyPath,\n  poly2: ReadonlyPath\n): Paths {\n  const nativePath1 = pathToNativePath(nativeLib, poly1);\n  const nativePath2 = pathToNativePath(nativeLib, poly2);\n  const outNativePaths = new nativeLib.Paths();\n\n  try {\n    nativeLib.minkowskiDiff(nativePath1, nativePath2, outNativePaths);\n    tryDelete(nativePath1, nativePath2);\n    return nativePathsToPaths(nativeLib, outNativePaths, true); // frees outNativePaths\n  } finally {\n    tryDelete(nativePath1, nativePath2, outNativePaths);\n  }\n}\n\nexport function minkowskiSumPath(\n  nativeLib: NativeClipperLibInstance,\n  pattern: ReadonlyPath,\n  path: ReadonlyPath,\n  pathIsClosed: boolean\n): Paths {\n  const patternNativePath = pathToNativePath(nativeLib, pattern);\n  const nativePath = pathToNativePath(nativeLib, path);\n  const outNativePaths = new nativeLib.Paths();\n\n  try {\n    nativeLib.minkowskiSumPath(patternNativePath, nativePath, outNativePaths, pathIsClosed);\n    tryDelete(patternNativePath, nativePath);\n    return nativePathsToPaths(nativeLib, outNativePaths, true); // frees outNativePaths\n  } finally {\n    tryDelete(patternNativePath, nativePath, outNativePaths);\n  }\n}\n\nexport function minkowskiSumPaths(\n  nativeLib: NativeClipperLibInstance,\n  pattern: ReadonlyPath,\n  paths: ReadonlyPaths,\n  pathIsClosed: boolean\n): Paths {\n  // TODO: im not sure if for this method we can reuse the input/output path\n\n  const patternNativePath = pathToNativePath(nativeLib, pattern);\n  const nativePaths = pathsToNativePaths(nativeLib, paths);\n\n  try {\n    nativeLib.minkowskiSumPaths(patternNativePath, nativePaths, nativePaths, pathIsClosed);\n    tryDelete(patternNativePath);\n    return nativePathsToPaths(nativeLib, nativePaths, true); // frees nativePaths\n  } finally {\n    tryDelete(patternNativePath, nativePaths);\n  }\n}\n\nexport function openPathsFromPolyTree(polyTree: PolyTree): ReadonlyPath[] {\n  // we do this in JS since copying path is more expensive than just doing it\n\n  const result = [];\n  const len = polyTree.childs.length;\n  result.length = len;\n  let resultLength = 0;\n  for (let i = 0; i < len; i++) {\n    if (polyTree.childs[i].isOpen) {\n      result[resultLength++] = polyTree.childs[i].contour;\n    }\n  }\n  result.length = resultLength;\n  return result;\n}\n\nexport function orientation(path: ReadonlyPath): boolean {\n  return area(path) >= 0;\n}\n\nexport function pointInPolygon(\n  point: Readonly<IntPoint>,\n  path: ReadonlyPath\n): PointInPolygonResult {\n  // we do this in JS since copying path is more expensive than just doing it\n\n  // returns 0 if false, +1 if true, -1 if pt ON polygon boundary\n  // See \"The Point in Polygon Problem for Arbitrary Polygons\" by Hormann & Agathos\n  // http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.88.5498&rep=rep1&type=pdf\n  let result = 0;\n  const cnt = path.length;\n  if (cnt < 3) {\n    return 0;\n  }\n  let ip = path[0];\n  for (let i = 1; i <= cnt; ++i) {\n    const ipNext = i === cnt ? path[0] : path[i];\n    if (ipNext.y === point.y) {\n      if (ipNext.x === point.x || (ip.y === point.y && ipNext.x > point.x === ip.x < point.x)) {\n        return -1;\n      }\n    }\n    if (ip.y < point.y !== ipNext.y < point.y) {\n      if (ip.x >= point.x) {\n        if (ipNext.x > point.x) {\n          result = 1 - result;\n        } else {\n          const d =\n            (ip.x - point.x) * (ipNext.y - point.y) - (ipNext.x - point.x) * (ip.y - point.y);\n          if (d === 0) {\n            return -1;\n          } else if (d > 0 === ipNext.y > ip.y) {\n            result = 1 - result;\n          }\n        }\n      } else {\n        if (ipNext.x > point.x) {\n          const d =\n            (ip.x - point.x) * (ipNext.y - point.y) - (ipNext.x - point.x) * (ip.y - point.y);\n          if (d === 0) {\n            return -1;\n          } else if (d > 0 === ipNext.y > ip.y) {\n            result = 1 - result;\n          }\n        }\n      }\n    }\n    ip = ipNext;\n  }\n  return result;\n}\n\nexport function polyTreeToPaths(polyTree: PolyTree): Paths {\n  // we do this in JS since copying path is more expensive than just doing it\n\n  const result: Paths = [];\n  // result.Capacity = polytree.total;\n  addPolyNodeToPaths(polyTree, NodeType.Any, result);\n  return result;\n}\n\nexport function reversePath(path: Path): void {\n  // we use JS since copying structures is slower than actually doing it\n  path.reverse();\n}\n\nexport function reversePaths(paths: Paths): void {\n  // we use JS since copying structures is slower than actually doing it\n  for (let i = 0, max = paths.length; i < max; i++) {\n    reversePath(paths[i]);\n  }\n}\n\nexport function simplifyPolygon(\n  nativeLib: NativeClipperLibInstance,\n  path: ReadonlyPath,\n  fillType: PolyFillType = PolyFillType.EvenOdd\n): Paths {\n  const nativePath = pathToNativePath(nativeLib, path);\n  const outNativePaths = new nativeLib.Paths();\n  try {\n    nativeLib.simplifyPolygon(\n      nativePath,\n      outNativePaths,\n      polyFillTypeToNative(nativeLib, fillType)\n    );\n    tryDelete(nativePath);\n    return nativePathsToPaths(nativeLib, outNativePaths, true); // frees outNativePaths\n  } finally {\n    tryDelete(nativePath, outNativePaths);\n  }\n}\n\nexport function simplifyPolygons(\n  nativeLib: NativeClipperLibInstance,\n  paths: ReadonlyPaths,\n  fillType: PolyFillType = PolyFillType.EvenOdd\n): Paths {\n  const nativePaths = pathsToNativePaths(nativeLib, paths);\n  try {\n    nativeLib.simplifyPolygonsOverwrite(nativePaths, polyFillTypeToNative(nativeLib, fillType));\n    return nativePathsToPaths(nativeLib, nativePaths, true); // frees nativePaths\n  } finally {\n    tryDelete(nativePaths);\n  }\n}\n\nexport function scalePath(path: ReadonlyPath, scale: number): Path {\n  const len = path.length;\n\n  const sol: Path = [];\n  sol.length = path.length;\n\n  for (let i = 0; i < len; i++) {\n    const p = path[i];\n    sol[i] = {\n      x: Math.round(p.x * scale),\n      y: Math.round(p.y * scale),\n    };\n  }\n\n  return sol;\n}\n\n/**\n * Scales all inner paths by multiplying all its coordinates by a number and then rounding them.\n *\n * @param paths - Paths to scale\n * @param scale - Scale multiplier\n * @return {Paths} - The scaled paths\n */\nexport function scalePaths(paths: ReadonlyPaths, scale: number): Paths {\n  if (scale === 0) {\n    return [];\n  }\n\n  const len = paths.length;\n\n  const sol: Paths = [];\n  sol.length = len;\n\n  for (let i = 0; i < len; i++) {\n    sol[i] = scalePath(paths[i], scale);\n  }\n\n  return sol;\n}\n"]}