ZacharyZhang-NY
5605d785de
Fifteen shop components: PriceTag, Wallet, ShopItem, Cart, Receipt, Checkout, CurrencyConvert, SaleBadge, Quantity, PricingTiers, Coupon, DailyReward, BidTicker, TradeWindow and VendingMachine. Receipt prints dot by dot with feed holes and a torn edge; Coupon cuts real notches; SaleBadge is a sixteen-point starburst; VendingMachine sells A1 to D4 by code and drops the snack into its tray. Sums are checked against overflow, TradeWindow withdraws both confirms on any change to an offer, and a disabled Checkout veils its inert content. text.Odometer now counts digits as text, steps at 15 fps as S5 asks, draws exact digits at rest and lands rolls that floats would stall.
103 lines
2.9 KiB
Go
103 lines
2.9 KiB
Go
package shop
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import (
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"fmt"
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"hash/fnv"
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"math"
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"strconv"
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"strings"
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"time"
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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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// ReceiptLine is a bought ware.
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type ReceiptLine struct {
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Name string
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Qty, Price int
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}
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type ReceiptOptions struct {
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// Width is in dots; zero means 180.
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Width int
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// Time prints under the shop; zero prints none.
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Time time.Time
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}
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// Receipt prints lines dot-matrix style, perforated down the sides.
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func Receipt(c *ui.Context, shop string, lines []ReceiptLine, o ReceiptOptions) *ui.Element {
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k := pixel.K(c)
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if shop == "" {
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panic("shop: Receipt has no shop name")
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}
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w, total := pixel.Or("Receipt Width", o.Width, 180), 0
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rows := make([][2]string, len(lines))
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for i, l := range lines {
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amount("Receipt price", l.Price)
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if l.Name == "" || l.Qty < 1 || l.Price > (math.MaxInt-total)/l.Qty {
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panic(fmt.Sprintf("shop: Receipt line %q, %d at %d", l.Name, l.Qty, l.Price))
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}
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total += l.Qty * l.Price
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rows[i] = [2]string{fmt.Sprintf("%d×%s", l.Qty, l.Name), strconv.Itoa(l.Qty * l.Price)}
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}
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sum, thanks := strconv.Itoa(total), k.Msg("thank_you")
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said := make([]string, len(rows))
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for i, r := range rows {
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said[i] = r[0] + " " + r[1]
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}
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h := pixel.LineHeight*(len(rows)+5) + 24
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return ui.Box(c).Size(k.D(w), k.D(h)).Role(ui.RoleImage).Label(shop).Description(strings.Join(append(said, k.Msg("total")+" "+sum), ", ")).Draw(func(p *ui.Painter, r ui.Rect) {
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g := k.Canvas(p, r)
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// Paper, with feed holes punched down both sides.
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g.Rect(0, 0, w, h-4, pixel.Lit)
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for y := 4; y < h-8; y += 8 {
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g.Rect(3, y, 2, 2, pixel.Shade)
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g.Rect(w-5, y, 2, 2, pixel.Shade)
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}
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// A torn edge of teeth along the bottom.
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for x := 0; x < w; x += 4 {
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g.Rect(x, h-4, 2, 2, pixel.Lit)
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g.Rect(x+1, h-2, 1, 2, pixel.Lit)
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}
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line := func(y int, l, rt string, ink pixel.Slot) {
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l = pixel.Wrap(l, w-28-pixel.Measure(rt), 1)[0]
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g.Text(10, y, l, ink, 1)
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g.Text(w-10-pixel.Measure(rt), y, rt, ink, 1)
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// Dot leaders run from the name to the price.
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for x := 12 + pixel.Measure(l); x < w-12-pixel.Measure(rt); x += 3 {
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g.Dot(x, y+12, pixel.Faint)
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}
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}
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y := 4
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g.Text((w-pixel.Measure(shop))/2, y, shop, pixel.Ink, 1)
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if !o.Time.IsZero() {
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y += pixel.LineHeight
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d := o.Time.Format("2006-01-02 15:04")
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g.Text((w-pixel.Measure(d))/2, y, d, pixel.Faint, 1)
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}
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y += pixel.LineHeight + 2
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for x := 10; x < w-10; x += 4 {
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g.Rect(x, y, 2, 1, pixel.Shade)
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}
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y += 3
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for _, rw := range rows {
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line(y, rw[0], rw[1], pixel.Ink)
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y += pixel.LineHeight
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}
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line(y+2, k.Msg("total"), sum, pixel.Ink)
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y += pixel.LineHeight + 4
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g.Text((w-pixel.Measure(thanks))/2, y, thanks, pixel.Ink, 1)
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// A barcode drawn from the total, for show.
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hs := fnv.New32a()
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hs.Write([]byte(sum))
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bits := hs.Sum32()
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for i, x := 0, (w-64)/2; i < 32; i, x = i+1, x+2 {
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if bits>>i&1 == 1 || i%8 == 0 {
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g.Rect(x, y+pixel.LineHeight+2, 1, 10, pixel.Ink)
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}
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}
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})
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}
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