// 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...)
}
}
// Thumbnail fulfills the plot.Thumbnailer interface.
func (b *BarChart) Thumbnail(c *draw.Canvas) {
pts := []draw.Point{
{c.Min.X, c.Min.Y},
{c.Min.X, c.Max.Y},
{c.Max.X, c.Max.Y},
{c.Max.X, c.Min.Y},
}
poly := c.ClipPolygonY(pts)
c.FillPolygon(b.Color, poly)
pts = append(pts, draw.Point{X: c.Min.X, Y: c.Min.Y})
outline := c.ClipLinesY(pts)
c.StrokeLines(b.LineStyle, outline...)
}
// Thumbnail the thumbnail for the Line,
// implementing the plot.Thumbnailer interface.
func (pts *Line) Thumbnail(c *draw.Canvas) {
if pts.ShadeColor != nil {
points := []draw.Point{
{c.Min.X, c.Min.Y},
{c.Min.X, c.Max.Y},
{c.Max.X, c.Max.Y},
{c.Max.X, c.Min.Y},
}
poly := c.ClipPolygonY(points)
c.FillPolygon(*pts.ShadeColor, poly)
points = append(points, draw.Point{c.Min.X, c.Min.Y})
} else {
y := c.Center().Y
c.StrokeLine2(pts.LineStyle, c.Min.X, y, c.Max.X, y)
}
}
func (b *BoxPlotWithConfidenceIntervals) Plot(c draw.Canvas, plt *plot.Plot) {
if b.Horizontal {
panic("not handling horizontal BoxPlotWithConfidenceIntervals")
}
b.BoxPlot.Plot(c, plt)
trX, trY := plt.Transforms(&c)
x := trX(b.Location)
if !c.ContainsX(x) {
return
}
x += b.Offset
mean, err, _ := meanAndConf95(b.Values)
meanLength := trY(mean)
lowLength := trY(mean - err)
highLength := trY(mean + err)
confidenceVertices := []draw.Point{
{x - b.Width/4, lowLength},
{x + b.Width/4, lowLength},
{x + b.Width/4, highLength},
{x - b.Width/4, highLength},
}
confidencePoly := c.ClipPolygonY(confidenceVertices)
gray := color.RGBA{200, 200, 200, 255}
c.FillPolygon(gray, confidencePoly)
meanLine := c.ClipLinesY([]draw.Point{
{x - b.Width/4, meanLength},
{x + b.Width/4, meanLength},
})
meanStyle := b.BoxStyle
meanStyle.Color = color.RGBA{150, 150, 150, 255}
c.StrokeLines(meanStyle, meanLine...)
}