ZacharyZhang-NY
0e21870b64
An audio player with transport, scrubber and volume; an equalizer and a visualizer; a playlist; a cassette, cartridge and record that turn while they play and hold where they stop; piano keys, a step sequencer and a tracker you can type into; a waveform, a 16:9 video frame, an image compare, a gallery, a filmstrip, a record button and an FM tuner. input exports SlideBase, the undrawn rail its sliders share; the gallery treats exported Bases as building blocks, not components. pixel's micro font gains '#' for notes like C#4. pixel.Pad and the slide rail read input only while their base is enabled, so Inert or a fresh Disabled stops a drag or a key already sent. AGENTS records why a drawn container keeps the DISABLED description: MyGo paints a disabled subtree at half opacity.
41 lines
968 B
Go
41 lines
968 B
Go
package media
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import (
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"fmt"
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"math"
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"github.com/egoist/mygo/ui"
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"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
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)
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type WaveformOptions struct {
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// Height is in dots; zero means 32.
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Height int
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}
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// Waveform draws samples, ±1, as lines from the middle.
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func Waveform(c *ui.Context, text string, samples []float64, o WaveformOptions) *ui.Element {
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k := pixel.K(c)
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if len(samples) == 0 {
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panic("media: Waveform has no samples")
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}
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for _, s := range samples {
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if !(s >= -1 && s <= 1) {
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panic(fmt.Sprintf("media: Waveform sample %v outside ±1", s))
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}
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}
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h := pixel.Or("Waveform Height", o.Height, 32)
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half := (h - 1) / 2
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return art(c, k, text, 2*len(samples)-1, h).Draw(func(p *ui.Painter, r ui.Rect) {
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g := k.Canvas(p, r)
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for x := 1; x < g.W; x += 2 {
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g.Dot(x, half, pixel.Faint)
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}
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for i, s := range samples {
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n := int(math.Round(s * float64(half)))
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g.VLine(2*i, min(half, half-n), max(n, -n)+1, pixel.Accent)
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}
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})
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}
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