1 /* 2 * Copyright 2024 Google LLC 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 8 #ifndef SkArc_DEFINED 9 #define SkArc_DEFINED 10 11 #include "include/core/SkRect.h" 12 #include "include/core/SkScalar.h" 13 14 // Represents an arc along an oval boundary, or a closed wedge of the oval. 15 struct SkArc { 16 enum class Type : bool { 17 kArc, // An arc along the perimeter of the oval 18 kWedge // A closed wedge that includes the oval's center 19 }; 20 21 SkArc() = default; 22 SkArc(const SkArc& arc) = default; 23 SkArc& operator=(const SkArc& arc) = default; 24 ovalSkArc25 const SkRect& oval() const { return fOval; } startAngleSkArc26 SkScalar startAngle() const { return fStartAngle; } sweepAngleSkArc27 SkScalar sweepAngle() const { return fSweepAngle; } isWedgeSkArc28 bool isWedge() const { return fType == Type::kWedge; } 29 30 friend bool operator==(const SkArc& a, const SkArc& b) { 31 return a.fOval == b.fOval && a.fStartAngle == b.fStartAngle && 32 a.fSweepAngle == b.fSweepAngle && a.fType == b.fType; 33 } 34 35 friend bool operator!=(const SkArc& a, const SkArc& b) { return !(a == b); } 36 37 // Preferred factory that explicitly states which type of arc MakeSkArc38 static SkArc Make(const SkRect& oval, 39 SkScalar startAngleDegrees, 40 SkScalar sweepAngleDegrees, 41 Type type) { 42 return SkArc(oval, startAngleDegrees, sweepAngleDegrees, type); 43 } 44 45 // Deprecated factory to assist with legacy code based on `useCenter` MakeSkArc46 static SkArc Make(const SkRect& oval, 47 SkScalar startAngleDegrees, 48 SkScalar sweepAngleDegrees, 49 bool useCenter) { 50 return SkArc( 51 oval, startAngleDegrees, sweepAngleDegrees, useCenter ? Type::kWedge : Type::kArc); 52 } 53 54 // Bounds of oval containing the arc. 55 SkRect fOval = SkRect::MakeEmpty(); 56 57 // Angle in degrees where the arc begins. Zero means horizontally to the right. 58 SkScalar fStartAngle = 0; 59 // Sweep angle in degrees; positive is clockwise. 60 SkScalar fSweepAngle = 0; 61 62 Type fType = Type::kArc; 63 64 private: SkArcSkArc65 SkArc(const SkRect& oval, SkScalar startAngle, SkScalar sweepAngle, Type type) 66 : fOval(oval), fStartAngle(startAngle), fSweepAngle(sweepAngle), fType(type) {} 67 }; 68 69 #endif 70