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<h1>Example</h1>
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<th align="left">Delphi Code Sample:
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<tr>
<td class="White">
<pre class="brush: delphi;">
uses
graphics32, clipper;
function GetEllipsePoints(bounds: TIntRect): TPath;
begin
//code to create an elliptical polygon here
end;
procedure DrawPolygons(polys: TPaths; color: TColor32);
begin
//code to display the polygons here
end;
var
sub, clp, sol: TPaths;
begin
//set up the subject and clip polygons ...
setlength(sub, 3);
sub[0] := GetEllipsePoints(IntRect(100,100,300,300));
sub[1] := GetEllipsePoints(IntRect(125,130,275,180));
sub[2] := GetEllipsePoints(IntRect(125,220,275,270));
setlength(clp, 1);
clp[0] := GetEllipsePoints(IntRect(140,70,220,320));
//display the subject and clip polygons ...
DrawPolygons(sub, 0x8033FFFF);
DrawPolygons(clp, 0x80FFFF33);
//get the intersection of the subject and clip polygons ...
with TClipper.Create do
try
AddPaths(sub, ptSubject, true);
AddPaths(clp, ptClip, true);
Execute(ctIntersection, sol, pftEvenOdd, pftEvenOdd);
finally
free;
end;
//finally draw the intersection polygons ...
DrawPolygons(sol, 0x40808080);
</pre>
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<th align="left">C++ Code Sample:
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<tr>
<td class="White">
<pre class="brush: cpp;">
#include "clipper.hpp"
...
//from clipper.hpp ...
//typedef long long cInt;
//struct IntPoint {cInt X; cInt Y;};
//typedef std::vector<IntPoint> Path;
//typedef std::vector<Polygon> Paths;
using namespace ClipperLib;
void GetEllipsePoints(IntRect& bounds, Path& p)
{/* ... */}
void DrawPolygons(Paths& p, unsigned color)
{/* ... */}
int main()
{
//set up the subject and clip polygons ...
Paths sub(3);
GetEllipsePoints(IntRect(100,100,300,300), sub[0]);
GetEllipsePoints(IntRect(125,130,275,180), sub[1]);
GetEllipsePoints(IntRect(125,220,275,270), sub[2]);
Paths clp(1);
GetEllipsePoints(IntRect(140,70,220,320), clp[0]);
//display the subject and clip polygons ...
DrawPolygons(sub, 0x8033FFFF);
DrawPolygons(clp, 0x80FFFF33);
//get the intersection of the subject and clip polygons ...
Clipper clpr;
clpr.AddPaths(sub, ptSubject, true);
clpr.AddPaths(clp, ptClip, true);
Paths solution;
clpr.Execute(ctIntersection, solution, pftEvenOdd, pftEvenOdd);
//finally draw the intersection polygons ...
DrawPolygons(solution, 0x40808080);
}
</pre>
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<th align="left">C# Code Sample:
</th>
<tr>
<td class="White">
<pre class="brush: csharp;">
...
using ClipperLib;
...
using Path = List<IntPoint>;
using Paths = List<List<IntPoint>>;
static Path GetEllipsePoints(IntRect bounds)
{/* ... */}
static void DrawPolygons(Path p, uint color)
{/* ... */}
static void Main(string[] args)
{
Paths subjs = new Paths(3);
subjs.Add(GetEllipsePoints(new IntRect(100,100,300,300)));
subjs.Add(GetEllipsePoints(new IntRect(125,130,275,180)));
subjs.Add(GetEllipsePoints(new IntRect(125,220,275,270)));
Paths clips = new Paths(1);
clips.Add(GetEllipsePoints(new IntRect(140,70,220,320)));
DrawPolygons(subjs, 0x8033FFFF);
DrawPolygons(clips, 0x80FFFF33);
Paths solution = new Paths();
Clipper c = new Clipper();
c.AddPaths(subjs, PolyType.ptSubject, true);
c.AddPaths(clips, PolyType.ptClip, true);
c.Execute(ClipType.ctIntersection, solution);
DrawPolygons(solution, 0x40808080);
}
</pre>
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