virtual-banker/avatar/animation/expressions.go

package animation

// ExpressionMapping maps emotion values to facial expressions
type ExpressionMapping struct {
	Valence float64 // -1.0 to 1.0
	Arousal float64 // 0.0 to 1.0
}

// GetExpressionFromEmotion maps emotion to expression parameters
func GetExpressionFromEmotion(valence, arousal float64) ExpressionParams {
	// Map valence/arousal to expression
	// High valence + high arousal = happy/excited
	// Low valence + high arousal = angry/frustrated
	// High valence + low arousal = calm/content
	// Low valence + low arousal = sad/depressed

	var emotion string
	var smileAmount float64
	var browRaise float64
	var eyeWideness float64

	if valence > 0.5 && arousal > 0.5 {
		emotion = "happy"
		smileAmount = 0.8
		browRaise = 0.3
		eyeWideness = 0.6
	} else if valence < -0.5 && arousal > 0.5 {
		emotion = "angry"
		smileAmount = -0.5
		browRaise = -0.7
		eyeWideness = 0.8
	} else if valence > 0.3 && arousal < 0.3 {
		emotion = "calm"
		smileAmount = 0.3
		browRaise = 0.0
		eyeWideness = 0.4
	} else if valence < -0.3 && arousal < 0.3 {
		emotion = "sad"
		smileAmount = -0.3
		browRaise = 0.2
		eyeWideness = 0.3
	} else {
		emotion = "neutral"
		smileAmount = 0.0
		browRaise = 0.0
		eyeWideness = 0.5
	}

	return ExpressionParams{
		Emotion:      emotion,
		SmileAmount:  smileAmount,
		BrowRaise:    browRaise,
		EyeWideness:  eyeWideness,
		Valence:      valence,
		Arousal:      arousal,
	}
}

// ExpressionParams contains facial expression parameters
type ExpressionParams struct {
	Emotion     string
	SmileAmount float64 // -1.0 to 1.0
	BrowRaise   float64 // -1.0 to 1.0
	EyeWideness float64 // 0.0 to 1.0
	Valence     float64
	Arousal     float64
}