Shimmer
Shimmer creates an independent animation where each character is colored based on its position in a sweeping gradient wave.
// Default gradient
clog.Shimmer("Indexing documents").
Wait(ctx, action).
Msg("Indexed")
// Custom gradient with direction
clog.Shimmer("Synchronizing",
shimmer.WithGradient(
style.ColorStop{Position: 0, Color: colorful.Color{R: 0.3, G: 0.3, B: 0.8}},
style.ColorStop{Position: 0.5, Color: colorful.Color{R: 1, G: 1, B: 1}},
style.ColorStop{Position: 1, Color: colorful.Color{R: 0.3, G: 0.3, B: 0.8}},
),
shimmer.WithDirection(shimmer.MiddleIn),
).
Wait(ctx, action).
Msg("Synchronized")
Use shimmer.DefaultGradient() to get the default gradient stops.
Directions
| Constant | Description |
|---|---|
shimmer.Right | Left to right (default) |
shimmer.Left | Right to left |
shimmer.MiddleIn | Inward from both edges |
shimmer.MiddleOut | Outward from the center |
shimmer.BounceIn | Inward from both edges, then bounces out |
shimmer.BounceOut | Outward from center, then bounces in |
Speed
Control how fast the animation cycles with shimmer.WithSpeed(cyclesPerSecond). The default is 0.5 (one full cycle every two seconds). Values ≤ 0 are treated as the default.
clog.Shimmer("Fast shimmer",
shimmer.WithSpeed(2.0), // 2 gradient cycles per second
).
Wait(ctx, action).
Msg("Done")
clog.Pulse("Quick pulse", pulse.WithSpeed(1.5)).
Wait(ctx, action).
Msg("Done")
Both pulse and shimmer use ColorStop for gradient definitions:
type ColorStop struct {
Position float64 // 0.0-1.0
Color colorful.Color // from github.com/lucasb-eyer/go-colorful
}