Initial release: RadiantWave v1.0

internal/pattern/line/sineWavePattern.go

@@ -0,0 +1,80 @@
+package pattern
+
+import (
+	"math"
+
+	"rhemawavetech.com/rhemawave/internal/fontManager"
+)
+
+type SineWavePattern struct {
+	waveStepCounter int
+}
+
+func init() {
+	Register("sine", func() LinePattern { return &SineWavePattern{} })
+}
+
+func (s *SineWavePattern) Name() string { return "Sine Wave" }
+func (s *SineWavePattern) GetNextLine(words []string, wordIndex *int, ctx *LineRenderContext) []string {
+	const (
+		totalLines = 67
+		frequency  = 5.0  // cycles across all lines
+		amplitude  = 0.85 // how much wave can scale
+		baseRatio  = 0.03 // minimum line width as % of screen
+		sharpness  = 3.0  // sharpness of the curve
+	)
+
+	screenWidth := int32(800)
+	spaceWidth := int32(10)
+	font := (*fontManager.FontEntry)(nil)
+	fontScale := float32(1.0)
+
+	if ctx != nil {
+		screenWidth = ctx.ScreenWidth
+		spaceWidth = ctx.SpaceWidth
+		font = ctx.Font
+		fontScale = ctx.FontScale
+	}
+
+	// Sharpen the wave (skinnier troughs)
+	// raw := (math.Sin(2*math.Pi*frequency*float64(s.waveStepCounter)/totalLines) + 1.0) / 2.0
+	// waveVal := math.Pow(raw, sharpness)
+	angle := 2 * math.Pi * frequency * float64(s.waveStepCounter) / totalLines
+	waveVal := (math.Sin(angle) + 1.0) / 2.0
+
+	// Target width in pixels
+	targetWidth := int32(float64(screenWidth) * (baseRatio + amplitude*waveVal))
+
+	var line []string
+	var currentWidth int32
+
+	for len(words) > 0 {
+		word := words[*wordIndex%len(words)]
+		*wordIndex++
+
+		if word == "" {
+			continue
+		}
+
+		wordWidth := estimateWordWidth(word, font, fontScale)
+		if len(line) > 0 {
+			wordWidth += spaceWidth
+		}
+
+		if len(line) == 0 {
+			// Always include the first word
+			line = append(line, word)
+			currentWidth += wordWidth
+		} else {
+			// Only add next word if it fits
+			if currentWidth+wordWidth > targetWidth {
+				break
+			}
+			line = append(line, word)
+			currentWidth += wordWidth
+		}
+	}
+
+	s.waveStepCounter++
+	return line
+}