Add debug coordinates

a green line represents the y axis, a red one the x axis.

pkg/pattern/point/point.go

@@ -56,4 +56,25 @@ func Draw(c *canvas.Canvas, point Point, face *canvas.FontFace, debug bool) {
 
 	text := canvas.NewTextLine(face, point.Name(), canvas.Bottom)
 	c.RenderText(text, m.Translate(2, -4))
+
+	if debug {
+		yStyle := canvas.Style{
+			Fill:         canvas.Paint{},
+			Stroke:       canvas.Paint{Color: canvas.Green},
+			StrokeWidth:  0.2,
+			StrokeCapper: canvas.RoundCap,
+			StrokeJoiner: canvas.BevelJoin,
+		}
+		yLine := canvas.Line(0, 10)
+		xStyle := canvas.Style{
+			Fill:         canvas.Paint{},
+			Stroke:       canvas.Paint{Color: canvas.Red},
+			StrokeWidth:  0.2,
+			StrokeCapper: canvas.RoundCap,
+			StrokeJoiner: canvas.BevelJoin,
+		}
+		xLine := canvas.Line(10, 0)
+		c.RenderPath(yLine, yStyle, m)
+		c.RenderPath(xLine, xStyle, m)
+	}
 }