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#include "lineClipper.h"
/*
PONK coords are normalised -1<x<1
this scales everything by 10^4 to allow integer math to work
on shapes at screen res
*/
#define SCALE_FROM_OF 10000
#define SCALE_TO_OF 0.0001
vector <colourPolyline> lineClipper::clip(
vector <colourPolyline> shapes,
ofPolyline mask,
bool invert
)
{
//this supports one colour per polyline
vector <colourPolyline> output;
if (shapes.size()){
ofx::Clipper clipper;
mask.scale(SCALE_FROM_OF,SCALE_FROM_OF);
for (auto& shape: shapes) {
clipper.Clear();
clipper.addPolyline(mask, ClipperLib::ptClip);
shape.scale(SCALE_FROM_OF,SCALE_FROM_OF);
clipper.addPolyline(shape,ClipperLib::ptSubject);
vector <ofPolyline> clipped;
if (invert){
clipped = clipper.getClippedLines(ClipperLib::ctDifference);
}else {
clipped = clipper.getClippedLines(ClipperLib::ctIntersection);
}
for (auto& clip: clipped)
{
//clip.simplify(contour_simplify);
clip.scale(SCALE_TO_OF,SCALE_TO_OF);
output.push_back(colourPolyline(clip,shape.getColourAt(0)));
}
}
}
return output;
}
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