// draw draws the axis along the left side of a draw.Canvas.
func (a *verticalAxis) draw(c draw.Canvas) {
x := c.Min.X
if a.Label.Text != "" {
x += a.Label.Height(a.Label.Text)
c.Push()
c.Rotate(math.Pi / 2)
c.FillText(a.Label.TextStyle, c.Center().Y, -x, -0.5, 0, a.Label.Text)
c.Pop()
x += -a.Label.Font.Extents().Descent
}
marks := a.Tick.Marker.Ticks(a.Min, a.Max)
if w := tickLabelWidth(a.Tick.Label, marks); len(marks) > 0 && w > 0 {
x += w
}
major := false
for _, t := range marks {
y := c.Y(a.Norm(t.Value))
if !c.ContainsY(y) || t.IsMinor() {
continue
}
c.FillText(a.Tick.Label, x, y, -1, -0.5, t.Label)
major = true
}
if major {
x += a.Tick.Label.Width(" ")
}
if a.drawTicks() && len(marks) > 0 {
len := a.Tick.Length
for _, t := range marks {
y := c.Y(a.Norm(t.Value))
if !c.ContainsY(y) {
continue
}
start := t.lengthOffset(len)
c.StrokeLine2(a.Tick.LineStyle, x+start, y, x+len, y)
}
x += len
}
c.StrokeLine2(a.LineStyle, x, c.Min.Y, x, c.Max.Y)
}