wehub-resource-sync
97 lines
2.5 KiB
Go
97 lines
2.5 KiB
Go
package ui
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import "strings"
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// Half-width katakana + digits for the iconic Matrix digital rain.
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var matrixChars = []rune{
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'ｦ', 'ｧ', 'ｨ', 'ｩ', 'ｪ', 'ｫ', 'ｬ', 'ｭ', 'ｮ', 'ｯ',
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'ｰ', 'ｱ', 'ｲ', 'ｳ', 'ｴ', 'ｵ', 'ｶ', 'ｷ', 'ｸ', 'ｹ', 'ｺ',
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'ｻ', 'ｼ', 'ｽ', 'ｾ', 'ｿ', 'ﾀ', 'ﾁ', 'ﾂ', 'ﾃ', 'ﾄ',
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'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
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}
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// renderMatrix draws falling character streams reminiscent of the Matrix
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// digital rain. Each column has a fixed fall speed derived from its position.
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// Band energy controls how many columns are active (rain density).
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func (v *Visualizer) renderMatrix(bands []float64) string {
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height := v.Rows
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lines := make([]string, height)
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bandCount := len(bands)
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for row := range height {
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var sb, run strings.Builder
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tag := -1
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col := 0
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for b := range bandCount {
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w := visBandWidth(bandCount, b)
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for range w {
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energy := bands[b]
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seed := uint64(col)*7919 + 104729
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// Column activity: stable gate, changes every ~20 frames.
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// Higher energy activates more columns.
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if scatterHash(b, 0, col, v.frame/20) > energy*1.5+0.1 {
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if tag != -1 {
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flushStyleRun(&sb, &run, tag)
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tag = -1
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}
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run.WriteByte(' ')
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col++
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continue
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}
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// Fixed speed per column (2-4 frames per row step), derived
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// from column position so each drop falls steadily.
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speed := 2 + int(seed%3)
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// Trail length: 3-5 characters.
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trailLen := 3 + int((seed/7)%3)
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// Cycle length large enough for a visible gap between drops.
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cycleLen := height + trailLen + 4
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offset := int((seed / 13) % uint64(cycleLen))
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pos := (int(v.frame)/speed + offset) % cycleLen
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dist := pos - row
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if dist < 0 || dist > trailLen {
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if tag != -1 {
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flushStyleRun(&sb, &run, tag)
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tag = -1
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}
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run.WriteByte(' ')
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} else {
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// Character mutates slowly (~every 4 frames).
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charSeed := seed ^ (uint64(row)*31 + (v.frame/4)*17)
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ch := matrixChars[charSeed%uint64(len(matrixChars))]
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var newTag int
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switch {
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case dist == 0:
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newTag = 2
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case dist <= 2:
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newTag = 1
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default:
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newTag = 0
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}
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if newTag != tag {
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flushStyleRun(&sb, &run, tag)
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tag = newTag
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}
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run.WriteRune(ch)
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}
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col++
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}
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if b < bandCount-1 {
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if tag != -1 {
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flushStyleRun(&sb, &run, tag)
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tag = -1
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}
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run.WriteByte(' ')
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col++
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}
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}
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flushStyleRun(&sb, &run, tag)
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lines[row] = sb.String()
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}
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return strings.Join(lines, "\n")
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}
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