go-chart/yaxis.go

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package chart
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import (
"math"
"sort"
)
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// YAxis is a veritcal rule of the range.
// There can be (2) y-axes; a primary and secondary.
type YAxis struct {
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Name string
NameStyle Style
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Style Style
Zero GridLine
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AxisType YAxisType
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ValueFormatter ValueFormatter
Range Range
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Ticks []Tick
GridLines []GridLine
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GridMajorStyle Style
GridMinorStyle Style
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}
// GetName returns the name.
func (ya YAxis) GetName() string {
return ya.Name
}
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// GetNameStyle returns the name style.
func (ya YAxis) GetNameStyle() Style {
return ya.NameStyle
}
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// GetStyle returns the style.
func (ya YAxis) GetStyle() Style {
return ya.Style
}
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// GetTicks returns the ticks for a series.
// The coalesce priority is:
// - User Supplied Ticks (i.e. Ticks array on the axis itself).
// - Range ticks (i.e. if the range provides ticks).
// - Generating continuous ticks based on minimum spacing and canvas width.
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func (ya YAxis) GetTicks(r Renderer, ra Range, defaults Style, vf ValueFormatter) []Tick {
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if len(ya.Ticks) > 0 {
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return ya.Ticks
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}
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if tp, isTickProvider := ra.(TicksProvider); isTickProvider {
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return tp.GetTicks(r, defaults, vf)
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}
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tickStyle := ya.Style.InheritFrom(defaults)
return GenerateContinuousTicks(r, ra, true, tickStyle, vf)
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}
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// GetGridLines returns the gridlines for the axis.
func (ya YAxis) GetGridLines(ticks []Tick) []GridLine {
if len(ya.GridLines) > 0 {
return ya.GridLines
}
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return GenerateGridLines(ticks, ya.GridMajorStyle, ya.GridMinorStyle, false)
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}
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// Measure returns the bounds of the axis.
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func (ya YAxis) Measure(r Renderer, canvasBox Box, ra Range, defaults Style, ticks []Tick) Box {
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ya.Style.InheritFrom(defaults).WriteToRenderer(r)
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sort.Sort(Ticks(ticks))
var tx int
if ya.AxisType == YAxisPrimary {
tx = canvasBox.Right + DefaultYAxisMargin
} else if ya.AxisType == YAxisSecondary {
tx = canvasBox.Left - DefaultYAxisMargin
}
var minx, maxx, miny, maxy = math.MaxInt32, 0, math.MaxInt32, 0
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var maxTextHeight int
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for _, t := range ticks {
v := t.Value
ly := canvasBox.Bottom - ra.Translate(v)
tb := r.MeasureText(t.Label)
finalTextX := tx
if ya.AxisType == YAxisSecondary {
finalTextX = tx - tb.Width()
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}
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if tb.Height() > maxTextHeight {
maxTextHeight = tb.Height()
}
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if ya.AxisType == YAxisPrimary {
minx = canvasBox.Right
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maxx = Math.MaxInt(maxx, tx+tb.Width())
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} else if ya.AxisType == YAxisSecondary {
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minx = Math.MinInt(minx, finalTextX)
maxx = Math.MaxInt(maxx, tx)
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}
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miny = Math.MinInt(miny, ly-tb.Height()>>1)
maxy = Math.MaxInt(maxy, ly+tb.Height()>>1)
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}
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if ya.NameStyle.Show && len(ya.Name) > 0 {
maxx += (DefaultYAxisMargin + maxTextHeight)
}
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return Box{
Top: miny,
Left: minx,
Right: maxx,
Bottom: maxy,
}
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}
// Render renders the axis.
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func (ya YAxis) Render(r Renderer, canvasBox Box, ra Range, defaults Style, ticks []Tick) {
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ya.Style.InheritFrom(defaults).WriteToRenderer(r)
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sort.Sort(Ticks(ticks))
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sw := ya.Style.GetStrokeWidth(defaults.StrokeWidth)
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var lx int
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var tx int
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if ya.AxisType == YAxisPrimary {
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lx = canvasBox.Right + int(sw)
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tx = lx + DefaultYAxisMargin
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} else if ya.AxisType == YAxisSecondary {
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lx = canvasBox.Left - int(sw)
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tx = lx - DefaultYAxisMargin
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}
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r.MoveTo(lx, canvasBox.Bottom)
r.LineTo(lx, canvasBox.Top)
r.Stroke()
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var maxTextWidth int
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for _, t := range ticks {
v := t.Value
ly := canvasBox.Bottom - ra.Translate(v)
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tb := r.MeasureText(t.Label)
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if tb.Width() > maxTextWidth {
maxTextWidth = tb.Width()
}
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finalTextX := tx
finalTextY := ly + tb.Height()>>1
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if ya.AxisType == YAxisSecondary {
finalTextX = tx - tb.Width()
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}
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r.Text(t.Label, finalTextX, finalTextY)
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r.MoveTo(lx, ly)
if ya.AxisType == YAxisPrimary {
r.LineTo(lx+DefaultHorizontalTickWidth, ly)
} else if ya.AxisType == YAxisSecondary {
r.LineTo(lx-DefaultHorizontalTickWidth, ly)
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}
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r.Stroke()
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}
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nameStyle := ya.NameStyle.InheritFrom(defaults)
if ya.NameStyle.Show && len(ya.Name) > 0 {
nameStyle.GetTextOptions().WriteToRenderer(r)
r.SetTextRotation(Math.DegreesToRadians(90))
tb := r.MeasureText(ya.Name)
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var tx int
if ya.AxisType == YAxisPrimary {
tx = canvasBox.Right + int(sw) + DefaultYAxisMargin + maxTextWidth + DefaultYAxisMargin
} else if ya.AxisType == YAxisSecondary {
tx = canvasBox.Left - (DefaultYAxisMargin + int(sw) + maxTextWidth + DefaultYAxisMargin)
}
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ty := canvasBox.Bottom - (canvasBox.Height()>>1 + tb.Width()>>1)
r.Text(ya.Name, tx, ty)
r.ClearTextRotation()
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}
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if ya.Zero.Style.Show {
ya.Zero.Render(r, canvasBox, ra, Style{})
}
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if ya.GridMajorStyle.Show || ya.GridMinorStyle.Show {
for _, gl := range ya.GetGridLines(ticks) {
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if (gl.IsMinor && ya.GridMinorStyle.Show) || (!gl.IsMinor && ya.GridMajorStyle.Show) {
defaults := ya.GridMajorStyle
if gl.IsMinor {
defaults = ya.GridMinorStyle
}
gl.Render(r, canvasBox, ra, defaults)
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}
}
}
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}