Method updateLabelsY

gui/chart.go:343–369

updateLabelsY updates the Y scale labels text and positions

()

// updateLabelsY updates the Y scale labels text and positions
func (ch *Chart) updateLabelsY() {

	if ch.scaleY == nil {
		return
	}

	th := float32(0)
	if ch.title != nil {
		th = ch.title.height
	}

	nlines := ch.scaleY.lines
	vstep := (ch.maxY - ch.minY) / float32(nlines-1)
	pstep := (ch.ContentHeight() - th - ch.top - ch.bottom) / float32(nlines-1)
	value := ch.minY
	for i := 0; i < nlines; i++ {
		label := ch.labelsY[i]
		label.SetText(fmt.Sprintf(ch.formatY, value))
		px := ch.left - 4 - label.Width()
		if px < 0 {
			px = 0
		}
		py := ch.ContentHeight() - ch.bottom - float32(i)*pstep
		label.SetPosition(px, py-label.Height()/2)
		value += vstep
	}
}

// calcRangeY calculates the minimum and maximum y values for all graphs
func (ch *Chart) calcRangeY() {