pathops version two

src/pathops/SkPathOpsLine.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 "SkPathOpsLine.h"
 
-SkDLine SkDLine::subDivide(double t1, double t2) const {
-    SkDVector delta = tangent();
-    SkDLine dst = {{{
-            fPts[0].fX - t1 * delta.fX, fPts[0].fY - t1 * delta.fY}, {
-            fPts[0].fX - t2 * delta.fX, fPts[0].fY - t2 * delta.fY}}};
-    return dst;
-}
-
 // may have this below somewhere else already:
 // copying here because I thought it was clever
 
 // Copyright 2001, softSurfer (www.softsurfer.com)
 // This code may be freely used and modified for any purpose
 // providing that this copyright notice is included with it.
 // SoftSurfer makes no warranty for this code, and cannot be held
 // liable for any real or imagined damage resulting from its use.
 // Users of this code must verify correctness for their application.
 
 // Assume that a class is already given for the object:
 //    Point with coordinates {float x, y;}
 //===================================================================
 
+// (only used by testing)
 // isLeft(): tests if a point is Left|On|Right of an infinite line.
 //    Input:  three points P0, P1, and P2
 //    Return: >0 for P2 left of the line through P0 and P1
 //            =0 for P2 on the line
 //            <0 for P2 right of the line
 //    See: the January 2001 Algorithm on Area of Triangles
 //    return (float) ((P1.x - P0.x)*(P2.y - P0.y) - (P2.x - P0.x)*(P1.y - P0.y));
 double SkDLine::isLeft(const SkDPoint& pt) const {
     SkDVector p0 = fPts[1] - fPts[0];
     SkDVector p2 = pt - fPts[0];
@@ skipping 62 matching lines @@
     double t = numer / denom;
     SkDPoint realPt = ptAtT(t);
     double dist = realPt.distance(xy);   // OPTIMIZATION: can we compare against distSq instead ?
     // find the ordinal in the original line with the largest unsigned exponent
     double tiniest = SkTMin(SkTMin(SkTMin(fPts[0].fX, fPts[0].fY), fPts[1].fX), fPts[1].fY);
     double largest = SkTMax(SkTMax(SkTMax(fPts[0].fX, fPts[0].fY), fPts[1].fX), fPts[1].fY);
     largest = SkTMax(largest, -tiniest);
     return RoughlyEqualUlps(largest, largest + dist); // is the dist within ULPS tolerance?
 }
 
-// Returns true if a ray from (0,0) to (x1,y1) is coincident with a ray (0,0) to (x2,y2)
-// OPTIMIZE: a specialty routine could speed this up -- may not be called very often though
-bool SkDLine::NearRay(double x1, double y1, double x2, double y2) {
-    double denom1 = x1 * x1 + y1 * y1;
-    double denom2 = x2 * x2 + y2 * y2;
-    SkDLine line = {{{0, 0}, {x1, y1}}};
-    SkDPoint pt = {x2, y2};
-    if (denom2 > denom1) {
-        SkTSwap(line[1], pt);
-    }
-    return line.nearRay(pt);
-}
-
 double SkDLine::ExactPointH(const SkDPoint& xy, double left, double right, double y) {
     if (xy.fY == y) {
         if (xy.fX == left) {
             return 0;
         }
         if (xy.fX == right) {
             return 1;
         }
     }
     return -1;
@@ skipping 49 matching lines @@
     double distSq = distU.fX * distU.fX + distU.fY * distU.fY;
     double dist = sqrt(distSq); // OPTIMIZATION: can we compare against distSq instead ?
     double tiniest = SkTMin(SkTMin(x, top), bottom);
     double largest = SkTMax(SkTMax(x, top), bottom);
     largest = SkTMax(largest, -tiniest);
     if (!AlmostEqualUlps(largest, largest + dist)) { // is the dist within ULPS tolerance?
         return -1;
     }
     return t;
 }