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
146 lines • 15.4 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.PolyNode = void 0;
var PathToNativePath_1 = require("./native/PathToNativePath");
/**
* PolyNodes are encapsulated within a PolyTree container, and together provide a data structure representing the parent-child relationships of polygon
* contours returned by clipping/ofsetting methods.
*
* A PolyNode object represents a single polygon. It's isHole property indicates whether it's an outer or a hole. PolyNodes may own any number of PolyNode
* children (childs), where children of outer polygons are holes, and children of holes are (nested) outer polygons.
*/
var PolyNode = /** @class */ (function () {
function PolyNode() {
this._childs = [];
this._contour = [];
this._isOpen = false;
this._index = 0;
}
Object.defineProperty(PolyNode.prototype, "parent", {
/**
* Returns the parent PolyNode.
*
* The PolyTree object (which is also a PolyNode) does not have a parent and will return undefined.
*/
get: function () {
return this._parent;
},
enumerable: false,
configurable: true
});
Object.defineProperty(PolyNode.prototype, "childs", {
/**
* A read-only list of PolyNode.
* Outer PolyNode childs contain hole PolyNodes, and hole PolyNode childs contain nested outer PolyNodes.
*/
get: function () {
return this._childs;
},
enumerable: false,
configurable: true
});
Object.defineProperty(PolyNode.prototype, "contour", {
/**
* Returns a path list which contains any number of vertices.
*/
get: function () {
return this._contour;
},
enumerable: false,
configurable: true
});
Object.defineProperty(PolyNode.prototype, "isOpen", {
/**
* Returns true when the PolyNode's Contour results from a clipping operation on an open contour (path). Only top-level PolyNodes can contain open contours.
*/
get: function () {
return this._isOpen;
},
enumerable: false,
configurable: true
});
Object.defineProperty(PolyNode.prototype, "index", {
/**
* Index in the parent's child list, or 0 if no parent.
*/
get: function () {
return this._index;
},
enumerable: false,
configurable: true
});
Object.defineProperty(PolyNode.prototype, "isHole", {
/**
* Returns true when the PolyNode's polygon (Contour) is a hole.
*
* Children of outer polygons are always holes, and children of holes are always (nested) outer polygons.
* The isHole property of a PolyTree object is undefined but its children are always top-level outer polygons.
*
* @return {boolean}
*/
get: function () {
if (this._isHole === undefined) {
var result = true;
var node = this._parent;
while (node !== undefined) {
result = !result;
node = node._parent;
}
this._isHole = result;
}
return this._isHole;
},
enumerable: false,
configurable: true
});
/**
* The returned PolyNode will be the first child if any, otherwise the next sibling, otherwise the next sibling of the Parent etc.
*
* A PolyTree can be traversed very easily by calling GetFirst() followed by GetNext() in a loop until the returned object is undefined.
*
* @return {PolyNode | undefined}
*/
PolyNode.prototype.getNext = function () {
if (this._childs.length > 0) {
return this._childs[0];
}
else {
return this.getNextSiblingUp();
}
};
PolyNode.prototype.getNextSiblingUp = function () {
if (this._parent === undefined) {
return undefined;
}
else if (this._index === this._parent._childs.length - 1) {
//noinspection TailRecursionJS
return this._parent.getNextSiblingUp();
}
else {
return this._parent._childs[this._index + 1];
}
};
PolyNode.fillFromNativePolyNode = function (pn, nativeLib, nativePolyNode, parent, childIndex, freeNativePolyNode) {
pn._parent = parent;
var childs = nativePolyNode.childs;
for (var i = 0, max = childs.size(); i < max; i++) {
var newChild = PolyNode.fromNativePolyNode(nativeLib, childs.get(i), pn, i, freeNativePolyNode);
pn._childs.push(newChild);
}
// do we need to clear the object ourselves? for now let's assume so (seems to work)
pn._contour = (0, PathToNativePath_1.nativePathToPath)(nativeLib, nativePolyNode.contour, true);
pn._isOpen = nativePolyNode.isOpen();
pn._index = childIndex;
if (freeNativePolyNode) {
nativePolyNode.delete();
}
};
PolyNode.fromNativePolyNode = function (nativeLib, nativePolyNode, parent, childIndex, freeNativePolyNode) {
var pn = new PolyNode();
PolyNode.fillFromNativePolyNode(pn, nativeLib, nativePolyNode, parent, childIndex, freeNativePolyNode);
return pn;
};
return PolyNode;
}());
exports.PolyNode = PolyNode;
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It's isHole property indicates whether it's an outer or a hole. PolyNodes may own any number of PolyNode\n * children (childs), where children of outer polygons are holes, and children of holes are (nested) outer polygons.\n */\nexport class PolyNode {\n  protected _parent?: PolyNode;\n\n  /**\n   * Returns the parent PolyNode.\n   *\n   * The PolyTree object (which is also a PolyNode) does not have a parent and will return undefined.\n   */\n  get parent(): PolyNode | undefined {\n    return this._parent;\n  }\n\n  protected _childs: PolyNode[] = [];\n  /**\n   * A read-only list of PolyNode.\n   * Outer PolyNode childs contain hole PolyNodes, and hole PolyNode childs contain nested outer PolyNodes.\n   */\n  get childs(): PolyNode[] {\n    return this._childs;\n  }\n\n  protected _contour: ReadonlyPath = [];\n  /**\n   * Returns a path list which contains any number of vertices.\n   */\n  get contour(): ReadonlyPath {\n    return this._contour;\n  }\n\n  protected _isOpen = false;\n  /**\n   * Returns true when the PolyNode's Contour results from a clipping operation on an open contour (path). Only top-level PolyNodes can contain open contours.\n   */\n  get isOpen(): boolean {\n    return this._isOpen;\n  }\n\n  protected _index = 0;\n  /**\n   * Index in the parent's child list, or 0 if no parent.\n   */\n  get index(): number {\n    return this._index;\n  }\n\n  protected _isHole?: boolean;\n  /**\n   * Returns true when the PolyNode's polygon (Contour) is a hole.\n   *\n   * Children of outer polygons are always holes, and children of holes are always (nested) outer polygons.\n   * The isHole property of a PolyTree object is undefined but its children are always top-level outer polygons.\n   *\n   * @return {boolean}\n   */\n  get isHole(): boolean {\n    if (this._isHole === undefined) {\n      let result = true;\n      let node: PolyNode | undefined = this._parent;\n      while (node !== undefined) {\n        result = !result;\n        node = node._parent;\n      }\n      this._isHole = result;\n    }\n\n    return this._isHole;\n  }\n\n  /**\n   * The returned PolyNode will be the first child if any, otherwise the next sibling, otherwise the next sibling of the Parent etc.\n   *\n   * A PolyTree can be traversed very easily by calling GetFirst() followed by GetNext() in a loop until the returned object is undefined.\n   *\n   * @return {PolyNode | undefined}\n   */\n  getNext(): PolyNode | undefined {\n    if (this._childs.length > 0) {\n      return this._childs[0];\n    } else {\n      return this.getNextSiblingUp();\n    }\n  }\n\n  protected getNextSiblingUp(): PolyNode | undefined {\n    if (this._parent === undefined) {\n      return undefined;\n    } else if (this._index === this._parent._childs.length - 1) {\n      //noinspection TailRecursionJS\n      return this._parent.getNextSiblingUp();\n    } else {\n      return this._parent._childs[this._index + 1];\n    }\n  }\n\n  protected static fillFromNativePolyNode(\n    pn: PolyNode,\n    nativeLib: NativeClipperLibInstance,\n    nativePolyNode: NativePolyNode,\n    parent: PolyNode | undefined,\n    childIndex: number,\n    freeNativePolyNode: boolean\n  ): void {\n    pn._parent = parent;\n\n    const childs = nativePolyNode.childs;\n    for (let i = 0, max = childs.size(); i < max; i++) {\n      const newChild = PolyNode.fromNativePolyNode(\n        nativeLib,\n        childs.get(i),\n        pn,\n        i,\n        freeNativePolyNode\n      );\n      pn._childs.push(newChild);\n    }\n\n    // do we need to clear the object ourselves? for now let's assume so (seems to work)\n    pn._contour = nativePathToPath(nativeLib, nativePolyNode.contour, true);\n    pn._isOpen = nativePolyNode.isOpen();\n    pn._index = childIndex;\n\n    if (freeNativePolyNode) {\n      nativePolyNode.delete();\n    }\n  }\n\n  protected static fromNativePolyNode(\n    nativeLib: NativeClipperLibInstance,\n    nativePolyNode: NativePolyNode,\n    parent: PolyNode | undefined,\n    childIndex: number,\n    freeNativePolyNode: boolean\n  ): PolyNode {\n    const pn = new PolyNode();\n    PolyNode.fillFromNativePolyNode(\n      pn,\n      nativeLib,\n      nativePolyNode,\n      parent,\n      childIndex,\n      freeNativePolyNode\n    );\n    return pn;\n  }\n}\n"]}