From 6f9eca99e7114aef26f37fadd9a97b231aec4b92 Mon Sep 17 00:00:00 2001
From: "sashakoshka@tebibyte.media" <sashakoshka@tebibyte.media>
Date: Thu, 5 Sep 2024 16:46:49 -0400
Subject: [PATCH] Text cursor is now an I beam

---
 internal/system/textbox.go | 36 ++++++++++++++++++++++++------------
 1 file changed, 24 insertions(+), 12 deletions(-)

diff --git a/internal/system/textbox.go b/internal/system/textbox.go
index 8c36089..ca5a10d 100644
--- a/internal/system/textbox.go
+++ b/internal/system/textbox.go
@@ -253,20 +253,19 @@ func (this *textBox) drawDot (can canvas.Canvas) {
 	
 	pen := can.Pen()
 
-	bounds  := this.InnerBounds()
-	metrics := face.Metrics()
-	dot     := this.dot.Canon()
-	start   := this.drawer.PositionAt(dot.Start).Add(fixPt(this.textOffset()))
-	end     := this.drawer.PositionAt(dot.End  ).Add(fixPt(this.textOffset()))
-	height  := this.drawer.LineHeight().Round()
-	ascent  := fixed.Point26_6 { Y: metrics.Descent }
-	descent := fixed.Point26_6 { Y: metrics.Ascent  }
+	bounds   := this.InnerBounds()
+	metrics  := face.Metrics()
+	dot      := this.dot
+	canonDot := dot.Canon()
+	start    := this.drawer.PositionAt(canonDot.Start).Add(fixPt(this.textOffset()))
+	end      := this.drawer.PositionAt(canonDot.End  ).Add(fixPt(this.textOffset()))
+	canonEnd := this.drawer.PositionAt(dot.End       ).Add(fixPt(this.textOffset()))
+	height   := this.drawer.LineHeight().Round()
+	ascent   := fixed.Point26_6 { Y: metrics.Descent }
+	descent  := fixed.Point26_6 { Y: metrics.Ascent  }
 
 	switch {
-	case dot.Empty():
-		pen.Stroke(textColor)
-		pen.StrokeWeight(1)
-		pen.Path(roundPt(start.Add(ascent)), roundPt(start.Sub(descent)))
+	case canonDot.Empty():
 
 	case start.Y == end.Y:
 		pen.Fill(dotColor)
@@ -300,6 +299,19 @@ func (this *textBox) drawDot (can canvas.Canvas) {
 		rect.Min.X = bounds.Min.X
 		pen.Rectangle(rect)
 	}
+	
+	pen.Stroke(textColor)
+	pen.StrokeWeight(1)
+	beamTop    := roundPt(canonEnd.Add(ascent)).Sub(image.Pt(0, 1))
+	beamBottom := roundPt(canonEnd.Sub(descent))
+	beamSerif  := 3
+	pen.Path(beamTop, beamBottom)
+	pen.Path (
+		beamTop.Sub(image.Pt(beamSerif - 1, 0)),
+		beamTop.Add(image.Pt(beamSerif, 0)))
+	pen.Path (
+		beamBottom.Sub(image.Pt(beamSerif - 1, 0)),
+		beamBottom.Add(image.Pt(beamSerif, 0)))
 }
 
 func (this *textBox) textOffset () image.Point {