记录下对Clipeer.js的使用

首先在github上可以直接下载到Clipper的源码，是无压缩版的：https://github.com/Delapouite/JsClipper。

在使用Clipper前先看看Clipper的Demo展示：

http://jsclipper.sourceforge.net/6.4.2.2/main_demo.html

http://jsclipper.sourceforge.net/6.4.2.2/index.html?p=starter_boolean.html

接着就是Clipper的官网： https://sourceforge.net/projects/jsclipper/

API的URL：https://sourceforge.net/p/jsclipper/wiki/documentation/

Clipper的API方法列表：

Table of Contents

Clipper 6 Documentation

Table of Contents

Overview

Preprocessor defines

ClipperBase

--- ClipperBase methods ---

ClipperBase.AddPath()

ClipperBase.AddPaths()

ClipperBase.Clear()

Clipper

--- Clipper methods ---

ClipperLib.Clipper()

ClipperLib.Clipper.Area()

ClipperLib.Clipper.CleanPolygon()

ClipperLib.Clipper.CleanPolygons()

ClipperLib.Clipper.ClosedPathsFromPolyTree()

ClipperLib.Clipper.Execute()

ClipperLib.Clipper.GetBounds()

ClipperLib.Clipper.MinkowskiDiff()

ClipperLib.Clipper.MinkowskiSum()

ClipperLib.Clipper.OffsetPaths()

ClipperLib.Clipper.OpenPathsFromPolyTree()

ClipperLib.Clipper.Orientation()

ClipperLib.Clipper.PointInPolygon()

ClipperLib.Clipper.PolyTreeToPaths()

ClipperLib.Clipper.ReversePath()

ClipperLib.Clipper.ReversePaths()

ClipperLib.Clipper.SimplifyPolygon()

ClipperLib.Clipper.SimplifyPolygons()

--- Clipper Properties ---

ClipperLib.Clipper.PreserveCollinear

ClipperLib.Clipper.ReverseSolution

ClipperLib.Clipper.StrictlySimple

ClipperLib.Clipper.ZFillFunction

Types

ClipperLib.ClipType()

ClipperLib.EndType

ClipperLib.EndType_

ClipperLib.ExPolygon()

ClipperLib.ExPolygons()

InitOptions

ClipperLib.IntPoint()

ClipperLib.IntRect()

ClipperLib.JoinType

ClipperLib.Path()

ClipperLib.Paths()

ClipperLib.PolyFillType

ClipperLib.PolyType

ClipperLib.Clipper.ZFillCallback()

PolyTree

--- PolyTree methods ---

ClipperLib.PolyTree()

ClipperLib.PolyTree.Clear()

ClipperLib.PolyTree.GetFirst()

ClipperLib.PolyTree.Total()

PolyNode

--- PolyNode methods ---

ClipperLib.PolyNode()

ClipperLib.PolyNode.ChildCount()

ClipperLib.PolyNode.Childs()

ClipperLib.PolyNode.Contour()

ClipperLib.PolyNode.GetNext()

ClipperLib.PolyNode.IsHole()

ClipperLib.PolyNode.Parent()

--- PolyNode properties ---

ClipperLib.PolyNode.IsOpen

ClipperOffset

--- ClipperOffset methods ---

ClipperLib.ClipperOffset()

ClipperLib.ClipperOffset.AddPath()

ClipperLib.ClipperOffset.AddPaths()

ClipperLib.ClipperOffset.Clear()

ClipperLib.ClipperOffset.Execute()

--- ClipperOffset properties ---

ClipperLib.ClipperOffset.ArcTolerance

ClipperLib.ClipperOffset.MiterLimit

Rounding

JS

--- JS methods ---

ClipperLib.JS.AreaOfPolygon()

ClipperLib.JS.AreaOfPolygons()

ClipperLib.JS.BoundsOfPath()

ClipperLib.JS.BoundsOfPaths()

ClipperLib.JS.Clone()

ClipperLib.JS.Clean()

ClipperLib.JS.Lighten()

ClipperLib.JS.PerimeterOfPath()

ClipperLib.JS.PerimeterOfPaths()

ClipperLib.JS.ScaleDownPath()

ClipperLib.JS.ScaleDownPaths()

ClipperLib.JS.ScaleUpPath()

ClipperLib.JS.ScaleUpPaths()

ClipperLib.JS.PolyTreeToExPolygons()

ClipperLib.JS.ExPolygonsToPaths()

Copyright

下面简单记录一下使用方法：

Clipper最实用的就对多图形之间的剪裁功能。

  var subj_paths = [[{X:10,Y:10},{X:110,Y:10},{X:110,Y:110},{X:10,Y:110}],

                      [{X:20,Y:20},{X:20,Y:100},{X:100,Y:100},{X:100,Y:20}]];

  var clip_paths = [[{X:50,Y:50},{X:150,Y:50},{X:150,Y:150},{X:50,Y:150}],

                      [{X:60,Y:60},{X:60,Y:140},{X:140,Y:140},{X:140,Y:60}]];

  var scale = 100;

  ClipperLib.JS.ScaleUpPaths(subj_paths, scale);

  ClipperLib.JS.ScaleUpPaths(clip_paths, scale);

  var cpr = new ClipperLib.Clipper();

  cpr.AddPaths(subj_paths, ClipperLib.PolyType.ptSubject, true);

  cpr.AddPaths(clip_paths, ClipperLib.PolyType.ptClip, true);

  var subject_fillType = ClipperLib.PolyFillType.pftNonZero;

  var clip_fillType = ClipperLib.PolyFillType.pftNonZero;

  var clipTypes = [ClipperLib.ClipType.ctUnion, ClipperLib.ClipType.ctDifference, ClipperLib.ClipType.ctXor,

  ClipperLib.ClipType.ctIntersection];

  var clipTypesTexts = "Union, Difference, Xor, Intersection";

  var solution_paths, svg, cont = document.getElementById('svgcontainer');

  var i;

  for(i = 0; i < clipTypes.length; i++) {

    solution_paths = new ClipperLib.Paths();

    cpr.Execute(clipTypes[i], solution_paths, subject_fillType, clip_fillType);

    console.log(JSON.stringify(solution_paths));

  }

  //最终得到的裁剪结果集

  for(i2 = 0; i2 < solution_paths.length; i2++) {

      for(j = 0; j < solution_paths[i2].length; j++) {

        x = solution_paths[i2][j].X / scale;

        y = solution_paths[i2][j].Y / scale;

      }

  }

       关于clipTypes的说明：

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作者：fsgn