???

grid_line.go

@@ -0,0 +1,43 @@
+package chart
+
+// GridLine is a line on a graph canvas.
+type GridLine struct {
+	IsMinor    bool
+	IsVertical bool
+	Style      Style
+	Value      float64
+}
+
+// Major returns if the gridline is a `major` line.
+func (gl GridLine) Major() bool {
+	return !gl.IsMinor
+}
+
+// Minor returns if the gridline is a `minor` line.
+func (gl GridLine) Minor() bool {
+	return gl.IsMinor
+}
+
+// Vertical returns if the line is vertical line or not.
+func (gl GridLine) Vertical() bool {
+	return gl.IsVertical
+}
+
+// Horizontal returns if the line is horizontal line or not.
+func (gl GridLine) Horizontal() bool {
+	return !gl.IsVertical
+}
+
+// Render renders the gridline
+func (gl GridLine) Render(r Renderer, canvasBox Box, ra Range) {
+	lineleft := canvasBox.Left
+	lineright := canvasBox.Right
+	lineheight := canvasBox.Bottom - ra.Translate(gl.Value)
+
+	r.SetStrokeColor(gl.Style.GetStrokeColor(DefaultAxisColor))
+	r.SetStrokeWidth(gl.Style.GetStrokeWidth(DefaultAxisLineWidth))
+
+	r.MoveTo(lineleft, lineheight)
+	r.LineTo(lineright, lineheight)
+	r.Stroke()
+}