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Fix text offset: use (x, y) for X and subtract baseline Y so text top aligns with y

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Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>
This commit is contained in:
Greg Pomerantz 2026-05-09 13:11:03 -04:00
parent 965d6074f3
commit eb9754fde0
1 changed files with 12 additions and 4 deletions
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16
internal/ui/render.go
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@ -4,6 +4,7 @@ import (
"image"
"image/color"
"gioui.org/f32"
"gioui.org/layout"
"gioui.org/op"
"gioui.org/op/clip"
@ -259,10 +260,17 @@ func (r *Renderer) drawLineText(gtx layout.Context, shp *text.Shaper, x, y unit.
// drawLine draws a line of glyphs using shaper.Shape() and shaper.Bitmaps().
func (r *Renderer) drawLine(gtx layout.Context, shp *text.Shaper, line []text.Glyph, x, y unit.Dp, col color.NRGBA) {
// Offset coordinate system to (x, y).
// The shaper's glyph positions (g.X, g.Y) are absolute within the text block.
// g.Y for the first line is the ascent, so the top of the text will be at y.
t := op.Offset(image.Pt(gtx.Dp(x), gtx.Dp(y))).Push(gtx.Ops)
if len(line) == 0 {
return
}
first := line[0]
// shaper.Shape(line) returns a path where glyph positions are relative to
// the first glyph (first.X == 0 in the returned path). So we offset by
// (x, y) and let the shaper handle the rest.
// first.Y is the baseline; we subtract it so the top of the text is at y.
offX := float32(gtx.Dp(x))
offY := float32(gtx.Dp(y)) - float32(first.Y)
t := op.Affine(f32.Affine2D{}.Offset(f32.Pt(offX, offY))).Push(gtx.Ops)
// Draw vector glyphs
path := shp.Shape(line)