39 lines
1.0 KiB
Go
39 lines
1.0 KiB
Go
package layout
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import (
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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 ScreenOptions struct {
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// Vignette dithers Shade into the edges.
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Vignette bool
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Padding int
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}
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// Screen fills the window with Back; children form a column.
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func Screen(c *ui.Context, o ScreenOptions, children func()) *ui.Element {
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k := pixel.K(c)
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pad := orDef("Screen Padding", o.Padding, 0)
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return ui.Column(c).Fill().Padding(k.D(pad)).Draw(func(p *ui.Painter, r ui.Rect) {
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g := k.Canvas(p, r)
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g.Rect(0, 0, g.W, g.H, pixel.Back)
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if o.Vignette {
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vignette(g)
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}
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}).Children(children)
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}
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// vignette darkens four bands toward the edges.
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func vignette(g pixel.Canvas) {
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band := max(2, min(g.W, g.H)/32)
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for i := range 4 {
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in, lv := i*band, 8-2*i
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g.Veil(in, in, g.W-2*in, band, pixel.Shade, lv)
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g.Veil(in, g.H-in-band, g.W-2*in, band, pixel.Shade, lv)
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g.Veil(in, in+band, band, g.H-2*in-2*band, pixel.Shade, lv)
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g.Veil(g.W-in-band, in+band, band, g.H-2*in-2*band, pixel.Shade, lv)
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}
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}
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