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Xara Group Ltd, Gaddesden Place, Hemel Hempstead, HP2 6EX, UK. http://www.xara.com/ =================================XARAHEADEREND============================ */ #ifndef Include_CProfileBiasGain #define Include_CProfileBiasGain #include "iprofile.h" ///------------------------------------------------------------------------------------------------- /// /// class CProfileBiasGain /// /// Author: Harrison Ainsworth /// Date: 05/99 /// Purpose: Implementation of the IProfile interface as Perlin Bias and Gain: Bias resembling a /// gamma function, Gain resembling a sigma function, each being positive or negative. /// Together they provide a variety of simple and useful shapes. /// references: /// Hypertexture - Perlin, Hoffert - Siggraph conference proceedings 1989 /// Fast Alternatives to Perlin's Bias and Gain Functions - Schlick - Graphics Gems IV (AP 94) /// Implemen- There are two sub-interfaces: construction/setting and IProfile/mapping: /// tation: 'Setting' comprises the standard object services, and the choice of the Bias and /// Gain parameters. /// 'Mapping' comprises the methods set out in IProfile: for using the object to map /// values. /// Invariants: 0 < Bias_m < 1, 0 < Gain_m < 1 (0,1) /// -1 <= BiasMinus1ToPlus1_m <= +1, -1 <= GainMinus1ToPlus1_m <= +1 [-1,+1] /// DomainLength_m != 0, RangeLength_m != 0 /// ///------------------------------------------------------------------------------------------------- class CProfileBiasGain : public IProfile { public: ///----------------------------------------------------------------------------------------- /// standard object services ------------------------------- CProfileBiasGain (); CProfileBiasGain ( AFp BiasMinus1ToPlus1, AFp GainMinus1ToPlus1 ); ~CProfileBiasGain (); CProfileBiasGain ( const CProfileBiasGain& ); CProfileBiasGain& operator= ( const CProfileBiasGain& ); /// -------------------------------------------------------- /// set/get mapping /// Each parameter must be in the interval -1 to +1 [-1,+1] /// Bias: -1 'thickest', 0 'flat', +1 'thinnest' /// Gain: -1 'sharpest', 0 'flat', +1 'softest' virtual void SetBiasGain ( AFp BiasMinus1ToPlus1, AFp GainMinus1ToPlus1 ); virtual void SetBias ( AFp BiasMinus1ToPlus1 ); virtual void SetGain ( AFp GainMinus1ToPlus1 ); virtual AFp GetBias () const; virtual AFp GetGain () const; /// IProfile ----------------------------------------------- /// map zero-one interval virtual AFp MapZeroToOne ( AFp ZeroToOne ) const; /// map general intervals virtual void SetIntervals ( AFp Low, AFp High ); virtual void SetIntervals ( AFp DomainLow, AFp DomainHigh, AFp RangeLow, AFp RangeHigh ); virtual AFp MapInterval ( AFp ) const; virtual void MapInterval ( AFp Table[], INT32 length ) const; /// compare virtual bool operator== ( const CProfileBiasGain& ) const; void SetGeneratesInfiniteUndo (BOOL newVal) { generatesInfiniteUndo = newVal; } BOOL GetGeneratesInfiniteUndo () const { return (generatesInfiniteUndo); } void SetIsAFeatherProfile (BOOL newVal) { isAFeatherProfile = newVal; } BOOL GetIsAFeatherProfile () { return (isAFeatherProfile); } protected: ///--//--//--//--//--//--//--//--//--//--//--//--//--//--//--//--//--//--//--//--//--//-- /// conversion between intervals static AFp ConvertIntervalMinus1Plus1ToZeroOne ( AFp ); AFp ScaleDomainToZeroOne ( AFp ) const; AFp ScaleZeroOneToRange ( AFp ) const; /// the actual function-shape procedural definitions static AFp BiasGain ( AFp BiasAmount, AFp GainAmount, AFp Input ); inline static AFp Bias ( AFp BiasAmount, AFp Input ); inline static AFp Gain ( AFp GainAmount, AFp Input ); private: /////////////////////////////////////////////////////////////////////////////////////////// /// functions ---------------------------------------------- /// construction assistance void SetDefaultIntervals (); /// members ------------------------------------------------ /// parameters of the mapping AFp BiasMinus1ToPlus1_m; AFp GainMinus1ToPlus1_m; AFp Bias_m; AFp Gain_m; /// bounds of the mapping AFp DomainLow_m; AFp DomainLength_m; AFp RangeLow_m; AFp RangeLength_m; /// constants static const AFp kSmallAmount_s; /// CGS: when we compound a blend and change the the blends profile, we need to know whether the blend /// allows its parent compound to regenerate. This is controlled by the following variable, which is /// guaranteed to be set CBiasGainGadget::Message () returns (for dropdown) and HandleInput () is called /// (for sliders). This is the only sensible place to store the data - since it needs to be accessible /// (potentially) within all tool infobars BOOL generatesInfiniteUndo; // DO NOT SET THIS VALUE YOURSELF !!!! BOOL isAFeatherProfile; // CGS: we need to do some special processing for profiles that are // used with feathering. }; #endif//Include_CProfileBiasGain