64 lines
1.5 KiB
Go
64 lines
1.5 KiB
Go
package text
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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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// segments lists a..g as rects in a 7×11 cell.
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var segments = [7][4]int{{1, 0, 5, 1}, {6, 1, 1, 4}, {6, 6, 1, 4}, {1, 10, 5, 1}, {0, 6, 1, 4}, {0, 1, 1, 4}, {1, 5, 5, 1}}
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// lit holds each rune's segments, bit 0 for a.
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var lit = map[rune]uint8{
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'0': 0x3F, '1': 0x06, '2': 0x5B, '3': 0x4F, '4': 0x66, '5': 0x6D,
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'6': 0x7D, '7': 0x07, '8': 0x7F, '9': 0x6F, '-': 0x40, ' ': 0,
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}
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type SevenSegmentOptions struct {
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Scale int
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// Slot lights segments; zero means Bad.
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Slot pixel.Slot
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}
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// SevenSegment shows digits, minus and colon with ghost segments.
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func SevenSegment(c *ui.Context, s string, o SevenSegmentOptions) *ui.Element {
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k, sc := pixel.K(c), scale(o.Scale)
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ink := slotOr(o.Slot, pixel.Bad)
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w := 0
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for _, r := range s {
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w += cellW(r) + 2
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}
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return block(c, k, s, max(0, w-2)*sc, 11*sc, func(g pixel.Canvas) {
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x := 0
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for _, r := range s {
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if r == ':' {
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g.Rect(x+sc, 3*sc, sc, sc, ink)
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g.Rect(x+sc, 7*sc, sc, sc, ink)
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} else {
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for i, sg := range segments {
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if lit[r]&(1<<i) != 0 {
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g.Rect(x+sg[0]*sc, sg[1]*sc, sg[2]*sc, sg[3]*sc, ink)
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} else {
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g.Checker(x+sg[0]*sc, sg[1]*sc, sg[2]*sc, sg[3]*sc, pixel.Faint)
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}
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}
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}
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x += (cellW(r) + 2) * sc
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}
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})
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}
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// cellW is a rune's cell width; other runes panic.
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func cellW(r rune) int {
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if r == ':' {
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return 3
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}
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if _, ok := lit[r]; !ok {
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panic(fmt.Sprintf("text: SevenSegment cannot show %q", r))
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}
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return 7
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}
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