chromium/third_party/skia/src/pathops/SkLineParameters.h

/*
 * Copyright 2012 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#ifndef SkLineParameters_DEFINED
#define SkLineParameters_DEFINED

#include "src/pathops/SkPathOpsCubic.h"
#include "src/pathops/SkPathOpsLine.h"
#include "src/pathops/SkPathOpsQuad.h"

// Sources
// computer-aided design - volume 22 number 9 november 1990 pp 538 - 549
// online at http://cagd.cs.byu.edu/~tom/papers/bezclip.pdf

// This turns a line segment into a parameterized line, of the form
// ax + by + c = 0
// When a^2 + b^2 == 1, the line is normalized.
// The distance to the line for (x, y) is d(x,y) = ax + by + c
//
// Note that the distances below are not necessarily normalized. To get the true
// distance, it's necessary to either call normalize() after xxxEndPoints(), or
// divide the result of xxxDistance() by sqrt(normalSquared())

class SkLineParameters { … };

#endif