prototyped svg reports

2026-08-19 23:19:41 -06:00
parent 00eed86bb2
commit 82efe19ae0
106 changed files with 5450 additions and 46 deletions
@@ -0,0 +1,159 @@
+package charts
+
+import (
+	"fmt"
+	"slices"
+	"strings"
+
+	"ruben/inventory2/server/ui/svg"
+)
+
+type (
+	// TODO: rename to BarChart
+	Bar struct {
+		values  []BarValue
+		classes barChartClasses
+	}
+
+	BarValue struct {
+		Label string
+		Value float64
+	}
+
+	barChartClasses struct {
+		svg []string
+		bar []string
+	}
+)
+
+func NewBar(vs ...BarValue) *Bar {
+	return &Bar{
+		values: vs,
+	}
+}
+
+func (c *Bar) WithSVGClass(classes ...string) *Bar {
+	c.classes.svg = append(c.classes.svg, classes...)
+	return c
+}
+
+func (c *Bar) WithBarClass(classes ...string) *Bar {
+	c.classes.bar = append(c.classes.bar, classes...)
+	return c
+}
+
+func (c *Bar) SVG() svg.MarshalerReader {
+	const (
+		minX   = 0
+		minY   = 0
+		maxX   = 100
+		maxY   = 100
+		rangeX = maxX - minX
+		rangeY = maxY - minY
+	)
+
+	s := svg.NewSVG().
+		Attr(
+			svg.Style{
+				"width":        "100%",
+				"height":       "auto",
+				"padding":      "1em",
+				"border-width": "2px",
+			},
+			svg.ViewBox{
+				X:      minX,
+				Y:      minY,
+				Width:  maxX - minX,
+				Height: maxY - minY,
+			},
+			svg.Class(
+				strings.Join(append(
+					[]string{"rounded-lg", "border-border"},
+					c.classes.bar...,
+				), " "),
+			),
+		)
+
+	if len(c.classes.svg) != 0 {
+		s = s.Attr(svg.Class(strings.Join(c.classes.svg, " ")))
+	}
+
+	if len(c.values) > 0 {
+		minV := slices.MinFunc(c.values, func(a, b BarValue) int {
+			if a.Value < b.Value {
+				return -1
+			}
+			if a.Value > b.Value {
+				return 1
+			}
+			return 0
+		})
+		maxV := slices.MaxFunc(c.values, func(a, b BarValue) int {
+			if a.Value < b.Value {
+				return -1
+			}
+			if a.Value > b.Value {
+				return 1
+			}
+			return 0
+		})
+		rangeV := maxV.Value - minV.Value
+
+		spacePerBar := float64(rangeX) / float64(len(c.values))
+		barPadding := 0.025 * spacePerBar
+		barWidth := spacePerBar - (2 * barPadding)
+		fontSize := barWidth / 2
+
+		for i, v := range c.values {
+			scaledV := (v.Value - minV.Value) * rangeY / rangeV
+			barX := float64(i)*spacePerBar + barPadding
+			s = s.Child(
+				new(svg.Rect).
+					Attr(
+						svg.NewLength(barX).AsX(),
+						svg.NewLength(maxY-scaledV).AsY(),
+						svg.NewLength(barWidth).AsWidth(),
+						svg.NewLength(scaledV).AsHeight(),
+						svg.Class(
+							strings.Join(append(
+								[]string{"fill-accent"},
+								c.classes.bar...,
+							), " "),
+						),
+					),
+				svg.NewText(fmt.Sprint(v.Value)).
+					Attr(
+						svg.NewLength(barX+(barWidth/2)).AsX(),
+						svg.NewLength(maxY-scaledV+fontSize).AsY(),
+						svg.Fill("var(--accent-foreground)"),
+						svg.TextAnchorMiddle,
+						// svg.NewLength(fontSize).AsFontSize(),
+						svg.Style{
+							"font-size": fmt.Sprintf("%vpx", fontSize),
+						},
+					),
+			)
+
+			if v.Label != "" {
+				x := barX + (barWidth / 2)
+				y := maxY - fontSize
+				s = s.Child(
+					svg.NewText(v.Label).
+						Attr(
+							svg.NewLength(x).AsX(),
+							svg.NewLength(y).AsY(),
+							svg.Fill("var(--accent-foreground)"),
+							//svg.NewLength(fontSize).AsFontSize(),
+							svg.Style{
+								"font-size": fmt.Sprintf("%vpx", fontSize),
+							},
+							svg.DominantBaselineCentral,
+							svg.TransformRotate(-90).About(x, y),
+						),
+				)
+			}
+		}
+	}
+
+	return s
+}