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https://github.com/ultimatepp/ultimatepp.git
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168 lines
3 KiB
C++
168 lines
3 KiB
C++
#include "ScanLine.h"
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#define LLOG(x) LOG(x)
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void LinearPathConsumer::End()
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{
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}
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void LinearPathFilter::End()
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{
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PutEnd();
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}
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Stroker::Stroker(double width, double miterlimit, double tolerance, int linecap, int linejoin)
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: linecap(linecap),
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linejoin(linejoin)
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{
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w2 = width / 2;
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qmiter = miterlimit * w2;
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qmiter *= qmiter;
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fid = acos(1 - tolerance / w2);
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p0 = p1 = p2 = Null;
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}
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void Stroker::Move(const Pointf& p)
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{
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LLOG("Stroker::Move " << p);
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Finish();
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p1 = p;
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p0 = p2 = Null;
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}
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void Stroker::Round(const Pointf& p, const Pointf& v1, const Pointf& v2, double r)
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{
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double tolerance = 0.3;
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double a1 = Bearing(v1);
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double a2 = Bearing(v2);
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if(a1 < a2)
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a1 += 2 * M_PI;
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while(a1 > a2) {
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PutLine(Polar(p, r, a1));
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a1 -= fid;
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}
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}
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void Stroker::Line(const Pointf& p3)
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{
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LLOG("Stroker::Line " << p3);
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if(IsNull(p1)) {
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Move(p3);
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return;
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}
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if(IsNull(p2)) {
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Pointf v = p3 - p1;
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double l = Length(v);
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if(l < 1e-30)
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return;
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p2 = p3;
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v1 = v;
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o1 = Ortogonal(v1) * w2 / l;
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a1 = p1 + o1;
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b1 = p1 - o1;
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if(IsNull(p0)) {
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p0 = p1;
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v0 = v1;
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o0 = o1;
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a0 = a1;
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b0 = b1;
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}
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return;
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}
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Pointf v2 = p3 - p2;
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double l = Length(v2);
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if(l < 1e-30)
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return;
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Pointf o2 = Ortogonal(v2) * w2 / l;
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Pointf a2 = p2 + o2;
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Pointf b2 = p2 - o2;
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double d = v1.y * v2.x - v2.y * v1.x;
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if(d > 1e-30) {
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Pointf ts = a1 + v1 * (v2.y * (a1.x - a2.x) - v2.x * (a1.y - a2.y)) / d;
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PutMove(a1);
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if(linejoin != LINEJOIN_MITER || SquareDistance(ts, p2) > qmiter) {
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PutLine(a1 + v1);
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if(linejoin == LINEJOIN_ROUND)
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Round(p2, o1, o2, w2);
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}
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else
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PutLine(ts);
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PutLine(a2);
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PutMove(b2);
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PutLine(p2);
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PutLine(b1 + v1);
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PutLine(b1);
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}
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else
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if(d < -1e-30) {
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Pointf ts = b2 + v2 * (v1.y * (a2.x - a1.x) - v1.x * (a2.y - a1.y)) / d;
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PutMove(b2);
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if(linejoin != LINEJOIN_MITER || SquareDistance(ts, p2) > qmiter) {
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if(linejoin == LINEJOIN_ROUND)
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Round(p2, -o2, -o1, w2);
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PutLine(b1 + v1);
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}
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else
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PutLine(ts);
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PutLine(b1);
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PutMove(a1);
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PutLine(a1 + v1);
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PutLine(p2);
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PutLine(a2);
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}
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else {
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PutMove(a1);
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PutLine(a1 + v1);
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if(linejoin == LINEJOIN_ROUND)
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Round(p2, o1, o2, w2);
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PutLine(a2);
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PutMove(b2);
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PutLine(b1 + v1);
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PutLine(b1);
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}
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p1 = p2;
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v1 = v2;
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o1 = o2;
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a1 = a2;
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b1 = b2;
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p2 = p3;
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}
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void Stroker::Cap(const Pointf& p, const Pointf& v, const Pointf& o,
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const Pointf& a, const Pointf& b)
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{
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PutMove(a);
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if(linecap == LINECAP_SQUARE) {
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Pointf nv = Ortogonal(o);
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PutLine(a + nv);
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PutLine(b + nv);
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}
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if(linecap == LINECAP_ROUND)
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Round(p, -o, o, w2);
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PutLine(b);
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}
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void Stroker::Finish()
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{
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if(IsNull(p1) || IsNull(p2) || IsNull(p0))
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return;
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if(p2 == p0)
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Line(p0 + v0);
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else {
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PutMove(a1);
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PutLine(a1 + v1);
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PutMove(b1 + v1);
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PutLine(b1);
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Cap(p0, v0, o0, b0, a0);
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Cap(p2, -v1, -o1, a1 + v1, b1 + v1);
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}
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p0 = p1 = p2 = Null;
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}
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void Stroker::End()
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{
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Finish();
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PutEnd();
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}
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