1 /* 2 * Copyright 2019 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 SkParticleAffector_DEFINED 9 #define SkParticleAffector_DEFINED 10 11 #include "SkReflected.h" 12 13 #include "SkParticleData.h" 14 #include "SkPoint.h" 15 16 struct SkColorCurve; 17 struct SkCurve; 18 19 class SkParticleAffector : public SkReflected { 20 public: 21 REFLECTED_ABSTRACT(SkParticleAffector, SkReflected) 22 23 void apply(const SkParticleUpdateParams& params, SkParticleState ps[], int count); 24 void visitFields(SkFieldVisitor* v) override; 25 26 static void RegisterAffectorTypes(); 27 28 // Affectors that can set the linear or angular velocity. Both have a 'force' option to apply 29 // the resulting value as a force, rather than directly setting the velocity. 30 static sk_sp<SkParticleAffector> MakeLinearVelocity(const SkCurve& angle, 31 const SkCurve& strength, 32 bool force, 33 SkParticleFrame frame); 34 static sk_sp<SkParticleAffector> MakeAngularVelocity(const SkCurve& strength, 35 bool force); 36 37 // Set the orientation of a particle, relative to the world, local, or velocity frame. 38 static sk_sp<SkParticleAffector> MakeOrientation(const SkCurve& angle, 39 SkParticleFrame frame); 40 41 static sk_sp<SkParticleAffector> MakePointForce(SkPoint point, SkScalar constant, 42 SkScalar invSquare); 43 44 static sk_sp<SkParticleAffector> MakeSize(const SkCurve& curve); 45 static sk_sp<SkParticleAffector> MakeFrame(const SkCurve& curve); 46 static sk_sp<SkParticleAffector> MakeColor(const SkColorCurve& curve); 47 48 private: 49 virtual void onApply(const SkParticleUpdateParams& params, SkParticleState ps[], int count) = 0; 50 51 bool fEnabled = true; 52 }; 53 54 #endif // SkParticleAffector_DEFINED 55
