Add game components 246-268; data.DrawSlot, Canvas.TextVeil

Health, mana and experience bars, quarter hearts, lives, a spinning
coin counter, score board, stage timer, minimap with fog, compass,
hotbar, paper-doll equipment, skill tree, skill buttons with cooldown
wipes, status effects, a boss bar, damage numbers, quest log and
tracker, party frames, character sheet, level-up screen and shop.
data exports DrawSlot so every slot looks alike; pixel adds TextVeil
for dissolving text. Messages the font cannot draw are fixed and
TestMessagesHaveGlyphs holds every message to the font.

game/levelupscreen.go

@@ -0,0 +1,83 @@
+package game
+
+import (
+	"fmt"
+	"log/slog"
+	"strconv"
+
+	"github.com/egoist/mygo/ui"
+
+	"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/icon"
+	"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/input"
+	"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
+	"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/text"
+)
+
+// Attribute is a stat raised at a level up.
+type Attribute struct {
+	Name string
+	Base int
+	// Added is the points put in it this time.
+	Added int
+}
+
+type LevelUpScreenOptions struct {
+	Disabled bool
+}
+
+type LevelUpScreenResult struct {
+	Element *ui.Element
+	Changed bool
+	Done    bool
+}
+
+// back is ◀, the triangle icon turned around.
+var back = icon.TriangleRight.Mirror()
+
+// LevelUpScreen spends points on attributes with ◀ ▶, then DONE.
+func LevelUpScreen(c *ui.Context, title string, attrs []Attribute, points *int, o LevelUpScreenOptions) LevelUpScreenResult {
+	k := pixel.K(c)
+	if *points < 0 {
+		panic(fmt.Sprintf("game: LevelUpScreen has %d points", *points))
+	}
+	name := 0
+	for _, a := range attrs {
+		if a.Base < 0 || a.Added < 0 {
+			panic(fmt.Sprintf("game: attribute %q is %d%+d", a.Name, a.Base, a.Added))
+		}
+		name = max(name, pixel.Measure(a.Name))
+	}
+	col := ui.Column(c).Gap(k.D(4)).Role(ui.RoleGroup).Label(title)
+	res := LevelUpScreenResult{Element: col}
+	col.Children(func() {
+		ui.Row(c).Gap(k.D(10)).AlignItems(ui.End).Children(func() {
+			text.ShadowText(c, k.Msg("level_up"), text.ShadowTextOptions{Scale: 2, Slot: pixel.Warn})
+			pixel.Text(c, fmt.Sprintf(k.Msg("points"), *points), pixel.TextOptions{Slot: pixel.Accent})
+		})
+		for i := range attrs {
+			a := &attrs[i]
+			ui.Row(c).Gap(k.D(4)).AlignItems(ui.Center).Children(func() {
+				ui.Box(c).Width(k.D(name + 6)).Children(func() { pixel.Text(c, a.Name, pixel.TextOptions{}) })
+				if input.IconButton(c, back, a.Name+" "+k.Msg("down"), input.IconButtonOptions{Size: input.Small, Disabled: o.Disabled || a.Added == 0}).Clicked {
+					a.Added, *points, res.Changed = a.Added-1, *points+1, true
+				}
+				ui.Box(c).Width(k.D(40)).Children(func() {
+					ui.Row(c).Children(func() {
+						pixel.Text(c, strconv.Itoa(a.Base+a.Added), pixel.TextOptions{})
+						if a.Added > 0 {
+							pixel.Text(c, "+"+strconv.Itoa(a.Added), pixel.TextOptions{Slot: pixel.Good})
+						}
+					})
+				})
+				if input.IconButton(c, icon.TriangleRight, a.Name+" "+k.Msg("up"), input.IconButtonOptions{Size: input.Small, Disabled: o.Disabled || *points == 0}).Clicked {
+					a.Added, *points, res.Changed = a.Added+1, *points-1, true
+				}
+			})
+		}
+		res.Done = input.Button(c, k.Msg("done"), input.ButtonOptions{Variant: input.Primary, Disabled: o.Disabled}).Clicked
+	})
+	if res.Changed {
+		slog.Debug("8bit: level up", "label", title, "points", *points)
+	}
+	return res
+}