55 lines
1.1 KiB
Go
55 lines
1.1 KiB
Go
// Package display shows things: pictures, faces, badges and prizes.
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package display
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import (
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"fmt"
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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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// art is a labeled w×h dot image that fn draws.
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func art(c *ui.Context, k pixel.Kit, label string, w, h int, fn func(g pixel.Canvas)) *ui.Element {
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e := ui.Box(c).Size(k.D(w), k.D(h))
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if label != "" {
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e.Label(label).Role(ui.RoleImage)
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} else {
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e.Role(ui.RoleNone)
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}
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if fn != nil {
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e.Draw(func(p *ui.Painter, r ui.Rect) { fn(k.Canvas(p, r)) })
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}
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return e
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}
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// orDef is v, or def for zero; negative panics.
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func orDef(name string, v, def int) int {
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if v < 0 {
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panic(fmt.Sprintf("display: %s %d is negative", name, v))
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}
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if v == 0 {
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return def
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}
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return v
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}
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// scale is s, or 1 for zero; outside 1–4 panics.
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func scale(s int) int {
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s = orDef("Scale", s, 1)
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if s > 4 {
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panic(fmt.Sprintf("display: Scale %d outside 1–4", s))
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}
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return s
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}
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// slotOr is s, or def for the zero slot.
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func slotOr(s, def pixel.Slot) pixel.Slot {
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if s == pixel.Ink {
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return def
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}
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return s
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}
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func itoa(n int) string { return fmt.Sprint(n) }
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