// Plot implements the plot.Plotter interface.
func (b *BarChart) Plot(c draw.Canvas, plt *plot.Plot) {
trCat, trVal := plt.Transforms(&c)
if b.Horizontal {
trCat, trVal = trVal, trCat
}
for i, ht := range b.Values {
catVal := b.XMin + float64(i)
catMin := trCat(float64(catVal))
if !b.Horizontal {
if !c.ContainsX(catMin) {
continue
}
} else {
if !c.ContainsY(catMin) {
continue
}
}
catMin = catMin - b.Width/2 + b.Offset
catMax := catMin + b.Width
bottom := b.stackedOn.BarHeight(i)
valMin := trVal(bottom)
valMax := trVal(bottom + ht)
var pts []draw.Point
var poly []draw.Point
if !b.Horizontal {
pts = []draw.Point{
{catMin, valMin},
{catMin, valMax},
{catMax, valMax},
{catMax, valMin},
}
poly = c.ClipPolygonY(pts)
} else {
pts = []draw.Point{
{valMin, catMin},
{valMin, catMax},
{valMax, catMax},
{valMax, catMin},
}
poly = c.ClipPolygonX(pts)
}
c.FillPolygon(b.Color, poly)
var outline [][]draw.Point
if !b.Horizontal {
pts = append(pts, draw.Point{X: catMin, Y: valMin})
outline = c.ClipLinesY(pts)
} else {
pts = append(pts, draw.Point{X: valMin, Y: catMin})
outline = c.ClipLinesX(pts)
}
c.StrokeLines(b.LineStyle, outline...)
}
}
// Plot implements the Plotter interface, drawing labels.
func (e *XErrorBars) Plot(c draw.Canvas, p *plot.Plot) {
trX, trY := p.Transforms(&c)
for i, err := range e.XErrors {
y := trY(e.XYs[i].Y)
xlow := trX(e.XYs[i].X - math.Abs(err.Low))
xhigh := trX(e.XYs[i].X + math.Abs(err.High))
bar := c.ClipLinesX([]draw.Point{{xlow, y}, {xhigh, y}})
c.StrokeLines(e.LineStyle, bar...)
e.drawCap(&c, xlow, y)
e.drawCap(&c, xhigh, y)
}
}
func (b horizBoxPlot) Plot(c draw.Canvas, plt *plot.Plot) {
trX, trY := plt.Transforms(&c)
y := trY(b.Location)
if !c.ContainsY(y) {
return
}
y += b.Offset
med := trX(b.Median)
q1 := trX(b.Quartile1)
q3 := trX(b.Quartile3)
aLow := trX(b.AdjLow)
aHigh := trX(b.AdjHigh)
box := c.ClipLinesX([]draw.Point{
{q1, y - b.Width/2},
{q3, y - b.Width/2},
{q3, y + b.Width/2},
{q1, y + b.Width/2},
{q1, y - b.Width/2 - b.BoxStyle.Width/2},
})
c.StrokeLines(b.BoxStyle, box...)
medLine := c.ClipLinesX([]draw.Point{
{med, y - b.Width/2},
{med, y + b.Width/2},
})
c.StrokeLines(b.MedianStyle, medLine...)
cap := b.CapWidth / 2
whisks := c.ClipLinesX([]draw.Point{{q3, y}, {aHigh, y}},
[]draw.Point{{aHigh, y - cap}, {aHigh, y + cap}},
[]draw.Point{{q1, y}, {aLow, y}},
[]draw.Point{{aLow, y - cap}, {aLow, y + cap}})
c.StrokeLines(b.WhiskerStyle, whisks...)
for _, out := range b.Outside {
x := trX(b.Value(out))
if c.ContainsX(x) {
c.DrawGlyphNoClip(b.GlyphStyle, draw.Point{X: x, Y: y})
}
}
}