diff --git a/allg5ui/renderer.go b/allg5ui/renderer.go
index 8f035a2..6789b11 100644
--- a/allg5ui/renderer.go
+++ b/allg5ui/renderer.go
@@ -279,6 +279,10 @@ func (r *Renderer) FillRectangle(rect geom.RectangleF32, c color.Color) {
 	allg5.DrawFilledRectangle(rect.Min.X, rect.Min.Y, rect.Max.X, rect.Max.Y, newColor(c))
 }
 
+func (r *Renderer) Line(p, q geom.PointF32, color color.Color, thickness float32) {
+	allg5.DrawLine(p.X, p.Y, q.X, q.Y, newColor(color), thickness)
+}
+
 func (r *Renderer) mustGetBitmap(t ui.Texture) *allg5.Bitmap {
 	texture, ok := t.(*texture)
 	if !ok {
diff --git a/sdlui/renderer.go b/sdlui/renderer.go
index 181c5e7..ab20896 100644
--- a/sdlui/renderer.go
+++ b/sdlui/renderer.go
@@ -361,6 +361,11 @@ func (r *Renderer) FillRectangle(rect geom.RectangleF32, c color.Color) {
 	r.renderer.FillRect(SDLRectanglePtr(rect))
 }
 
+func (r *Renderer) Line(p, q geom.PointF32, color color.Color, thickness float32) {
+	r.SetDrawColorGo(color)
+	r.renderer.DrawLineF(p.X, p.Y, p.X, p.Y)
+}
+
 func (r *Renderer) Rectangle(rect geom.RectangleF32, c color.Color, thickness float32) {
 	r.SetDrawColorGo(c)
 	if rect.Dx() == 0 { // SDL doesn't draw a 1 px wide line when Dx() == 0 && thickness == 1
diff --git a/ui/renderer.go b/ui/renderer.go
index 0c2c5ff..bc51bdf 100644
--- a/ui/renderer.go
+++ b/ui/renderer.go
@@ -29,6 +29,7 @@ type Renderer interface {
 	DrawTexturePoint(t Texture, p geom.PointF32)
 	DrawTexturePointOptions(t Texture, p geom.PointF32, opts DrawOptions)
 	FillRectangle(r geom.RectangleF32, c color.Color)
+	Line(p, q geom.PointF32, color color.Color, thickness float32)
 	Rectangle(r geom.RectangleF32, c color.Color, thickness float32)
 	RenderTo(Texture)
 	RenderToDisplay()