remove prototype pathops code

experimental/Intersection/CubicConvexHull.cpp

-/*
- * Copyright 2012 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "CubicUtilities.h"
-#include "CurveIntersection.h"
-#include "Intersections.h"
-#include "IntersectionUtilities.h"
-#include "LineIntersection.h"
-
-static const double tClipLimit = 0.8; // http://cagd.cs.byu.edu/~tom/papers/bezclip.pdf see Multiple intersections
-
-class CubicIntersections : public Intersections {
-public:
-
-CubicIntersections(const Cubic& c1, const Cubic& c2, Intersections& i)
-    : cubic1(c1)
-    , cubic2(c2)
-    , intersections(i)
-    , depth(0)
-    , splits(0) {
-}
-
-bool intersect() {
-    double minT1, minT2, maxT1, maxT2;
-    if (!bezier_clip(cubic2, cubic1, minT1, maxT1)) {
-        return false;
-    }
-    if (!bezier_clip(cubic1, cubic2, minT2, maxT2)) {
-        return false;
-    }
-    int split;
-    if (maxT1 - minT1 < maxT2 - minT2) {
-        intersections.swap();
-        minT2 = 0;
-        maxT2 = 1;
-        split = maxT1 - minT1 > tClipLimit;
-    } else {
-        minT1 = 0;
-        maxT1 = 1;
-        split = (maxT2 - minT2 > tClipLimit) << 1;
-    }
-    return chop(minT1, maxT1, minT2, maxT2, split);
-}
-
-protected:
-
-bool intersect(double minT1, double maxT1, double minT2, double maxT2) {
-    Cubic smaller, larger;
-    // FIXME: carry last subdivide and reduceOrder result with cubic
-    sub_divide(cubic1, minT1, maxT1, intersections.swapped() ? larger : smaller);
-    sub_divide(cubic2, minT2, maxT2, intersections.swapped() ? smaller : larger);
-    Cubic smallResult;
-    if (reduceOrder(smaller, smallResult, kReduceOrder_NoQuadraticsAllowed,
-            kReduceOrder_TreatAsFill) <= 2) {
-        Cubic largeResult;
-        if (reduceOrder(larger, largeResult, kReduceOrder_NoQuadraticsAllowed,
-                kReduceOrder_TreatAsFill) <= 2) {
-            const _Line& smallLine = (const _Line&) smallResult;
-            const _Line& largeLine = (const _Line&) largeResult;
-            Intersections lineTs;
-            // FIXME: this doesn't detect or deal with coincident lines
-            if (!::intersect(smallLine, largeLine, lineTs)) {
-                return false;
-            }
-            if (intersections.swapped()) {
-                lineTs.fT[0][0] = interp(minT2, maxT2, lineTs.fT[0][0]);
-                lineTs.fT[1][0] = interp(minT1, maxT1, lineTs.fT[1][0]);
-            } else {
-                lineTs.fT[0][0] = interp(minT1, maxT1, lineTs.fT[0][0]);
-                lineTs.fT[1][0] = interp(minT2, maxT2, lineTs.fT[1][0]);
-            }
-            _Point pt;
-            xy_at_t(cubic1, lineTs.fT[0][0], pt.x, pt.y);
-            intersections.insert(lineTs.fT[0][0], lineTs.fT[1][0], pt);
-            return true;
-        }
-    }
-    double minT, maxT;
-    if (!bezier_clip(smaller, larger, minT, maxT)) {
-        if (minT == maxT) {
-            if (intersections.swapped()) {
-                minT1 = (minT1 + maxT1) / 2;
-                minT2 = interp(minT2, maxT2, minT);
-            } else {
-                minT1 = interp(minT1, maxT1, minT);
-                minT2 = (minT2 + maxT2) / 2;
-            }
-            _Point pt;
-            xy_at_t(cubic1, minT1, pt.x, pt.y);
-            intersections.insert(minT1, minT2, pt);
-            return true;
-        }
-        return false;
-    }
-
-    int split;
-    if (intersections.swapped()) {
-        double newMinT1 = interp(minT1, maxT1, minT);
-        double newMaxT1 = interp(minT1, maxT1, maxT);
-        split = (newMaxT1 - newMinT1 > (maxT1 - minT1) * tClipLimit) << 1;
-#define VERBOSE 0
-#if VERBOSE
-        printf("%s d=%d s=%d new1=(%g,%g) old1=(%g,%g) split=%d\n",
-                __FUNCTION__, depth, splits, newMinT1, newMaxT1, minT1, maxT1,
-                split);
-#endif
-        minT1 = newMinT1;
-        maxT1 = newMaxT1;
-    } else {
-        double newMinT2 = interp(minT2, maxT2, minT);
-        double newMaxT2 = interp(minT2, maxT2, maxT);
-        split = newMaxT2 - newMinT2 > (maxT2 - minT2) * tClipLimit;
-#if VERBOSE
-        printf("%s d=%d s=%d new2=(%g,%g) old2=(%g,%g) split=%d\n",
-                __FUNCTION__, depth, splits, newMinT2, newMaxT2, minT2, maxT2,
-                split);
-#endif
-        minT2 = newMinT2;
-        maxT2 = newMaxT2;
-    }
-    return chop(minT1, maxT1, minT2, maxT2, split);
-}
-
-bool chop(double minT1, double maxT1, double minT2, double maxT2, int split) {
-    ++depth;
-    intersections.swap();
-    if (split) {
-        ++splits;
-        if (split & 2) {
-            double middle1 = (maxT1 + minT1) / 2;
-            intersect(minT1, middle1, minT2, maxT2);
-            intersect(middle1, maxT1, minT2, maxT2);
-        } else {
-            double middle2 = (maxT2 + minT2) / 2;
-            intersect(minT1, maxT1, minT2, middle2);
-            intersect(minT1, maxT1, middle2, maxT2);
-        }
-        --splits;
-        intersections.swap();
-        --depth;
-        return intersections.intersected();
-    }
-    bool result = intersect(minT1, maxT1, minT2, maxT2);
-    intersections.swap();
-    --depth;
-    return result;
-}
-
-private:
-
-const Cubic& cubic1;
-const Cubic& cubic2;
-Intersections& intersections;
-int depth;
-int splits;
-};
-
-bool intersect(const Cubic& c1, const Cubic& c2, Intersections& i) {
-    CubicIntersections c(c1, c2, i);
-    return c.intersect();
-}