1/*
2 * Copyright 2012 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7#ifndef SkPathOpsLine_DEFINED
8#define SkPathOpsLine_DEFINED
9
10#include "SkPathOpsPoint.h"
11
12struct SkDLine {
13    SkDPoint fPts[2];
14
15    const SkDPoint& operator[](int n) const { SkASSERT(n >= 0 && n < 2); return fPts[n]; }
16    SkDPoint& operator[](int n) { SkASSERT(n >= 0 && n < 2); return fPts[n]; }
17
18    void set(const SkPoint pts[2]) {
19        fPts[0] = pts[0];
20        fPts[1] = pts[1];
21    }
22
23    static SkDLine SubDivide(const SkPoint a[2], double t1, double t2) {
24        SkDLine line;
25        line.set(a);
26        return line.subDivide(t1, t2);
27    }
28
29    double exactPoint(const SkDPoint& xy) const;
30    static double ExactPointH(const SkDPoint& xy, double left, double right, double y);
31    static double ExactPointV(const SkDPoint& xy, double top, double bottom, double x);
32    double isLeft(const SkDPoint& pt) const;
33    double nearPoint(const SkDPoint& xy) const;
34    static double NearPointH(const SkDPoint& xy, double left, double right, double y);
35    static double NearPointV(const SkDPoint& xy, double top, double bottom, double x);
36    SkDPoint ptAtT(double t) const;
37    SkDLine subDivide(double t1, double t2) const;
38private:
39    SkDVector tangent() const { return fPts[0] - fPts[1]; }
40};
41
42#endif
43