Method Plot

plotter/grid.go:43–81

Plot implements the plot.Plotter interface.

(c draw.Canvas, plt *plot.Plot)

// Plot implements the plot.Plotter interface.
func (g *Grid) Plot(c draw.Canvas, plt *plot.Plot) {
	trX, trY := plt.Transforms(&c)

	var (
		ymin = c.Min.Y
		ymax = c.Max.Y
		xmin = c.Min.X
		xmax = c.Max.X
	)

	if g.Vertical.Color == nil {
		goto horiz
	}
	for _, tk := range plt.X.Tick.Marker.Ticks(plt.X.Min, plt.X.Max) {
		if tk.IsMinor() {
			continue
		}
		x := trX(tk.Value)
		if x > xmax || x < xmin {
			continue
		}
		c.StrokeLine2(g.Vertical, x, ymin, x, ymax)
	}

horiz:
	if g.Horizontal.Color == nil {
		return
	}
	for _, tk := range plt.Y.Tick.Marker.Ticks(plt.Y.Min, plt.Y.Max) {
		if tk.IsMinor() {
			continue
		}
		y := trY(tk.Value)
		if y > ymax || y < ymin {
			continue
		}
		c.StrokeLine2(g.Horizontal, xmin, y, xmax, y)
	}
}