// Plot implements the plot.Plotter interface.
func (b *BarChart) Plot(c draw.Canvas, plt *plot.Plot) {
trX, trY := plt.Transforms(&c)
for i, ht := range b.Values {
x := b.XMin + float64(i)
xmin := trX(float64(x))
if !c.ContainsX(xmin) {
continue
}
xmin = xmin - b.Width/2 + b.Offset
xmax := xmin + b.Width
bottom := b.stackedOn.BarHeight(i)
ymin := trY(bottom)
ymax := trY(bottom + ht)
pts := []draw.Point{
{xmin, ymin},
{xmin, ymax},
{xmax, ymax},
{xmax, ymin},
}
poly := c.ClipPolygonY(pts)
c.FillPolygon(b.Color, poly)
pts = append(pts, draw.Point{xmin, ymin})
outline := c.ClipLinesY(pts)
c.StrokeLines(b.LineStyle, outline...)
}
}
// Plot implements the Plotter interface, drawing a line
// that connects each point in the Line.
func (f *Function) Plot(c draw.Canvas, p *plot.Plot) {
trX, trY := p.Transforms(&c)
d := (p.X.Max - p.X.Min) / float64(f.Samples-1)
line := make([]draw.Point, f.Samples)
for i := range line {
x := p.X.Min + float64(i)*d
line[i].X = trX(x)
line[i].Y = trY(f.F(x))
}
c.StrokeLines(f.LineStyle, c.ClipLinesXY(line)...)
}
func (g GlyphBoxes) Plot(c draw.Canvas, plt *plot.Plot) {
for _, b := range plt.GlyphBoxes(plt) {
x := c.X(b.X) + b.Rectangle.Min.X
y := c.Y(b.Y) + b.Rectangle.Min.Y
c.StrokeLines(g.LineStyle, []draw.Point{
{x, y},
{x + b.Rectangle.Size().X, y},
{x + b.Rectangle.Size().X, y + b.Rectangle.Size().Y},
{x, y + b.Rectangle.Size().Y},
{x, y},
})
}
}
// Plot implements the Plotter interface, drawing labels.
func (e *YErrorBars) Plot(c draw.Canvas, p *plot.Plot) {
trX, trY := p.Transforms(&c)
for i, err := range e.YErrors {
x := trX(e.XYs[i].X)
ylow := trY(e.XYs[i].Y - math.Abs(err.Low))
yhigh := trY(e.XYs[i].Y + math.Abs(err.High))
bar := c.ClipLinesY([]draw.Point{{x, ylow}, {x, yhigh}})
c.StrokeLines(e.LineStyle, bar...)
e.drawCap(&c, x, ylow)
e.drawCap(&c, x, yhigh)
}
}
// 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 *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{c.Min.X, c.Min.Y})
outline := c.ClipLinesY(pts)
c.StrokeLines(b.LineStyle, outline...)
}
// Plot implements the Plotter interface, drawing a line
// that connects each point in the Line.
func (h *Histogram) Plot(c draw.Canvas, p *plot.Plot) {
trX, trY := p.Transforms(&c)
for _, bin := range h.Bins {
pts := []draw.Point{
{trX(bin.Min), trY(0)},
{trX(bin.Max), trY(0)},
{trX(bin.Max), trY(bin.Weight)},
{trX(bin.Min), trY(bin.Weight)},
}
if h.FillColor != nil {
c.FillPolygon(h.FillColor, c.ClipPolygonXY(pts))
}
pts = append(pts, draw.Point{trX(bin.Min), trY(0)})
c.StrokeLines(h.LineStyle, c.ClipLinesXY(pts)...)
}
}
// Thumbnail draws a rectangle in the given style of the histogram.
func (h *Histogram) Thumbnail(c *draw.Canvas) {
ymin := c.Min.Y
ymax := c.Max.Y
xmin := c.Min.X
xmax := c.Max.X
pts := []draw.Point{
{xmin, ymin},
{xmax, ymin},
{xmax, ymax},
{xmin, ymax},
}
if h.FillColor != nil {
c.FillPolygon(h.FillColor, c.ClipPolygonXY(pts))
}
pts = append(pts, draw.Point{xmin, ymin})
c.StrokeLines(h.LineStyle, c.ClipLinesXY(pts)...)
}
// Plot draws the Line, implementing the plot.Plotter
// interface.
func (pts *Line) Plot(c draw.Canvas, plt *plot.Plot) {
trX, trY := plt.Transforms(&c)
ps := make([]draw.Point, len(pts.XYs))
for i, p := range pts.XYs {
ps[i].X = trX(p.X)
ps[i].Y = trY(p.Y)
}
if pts.ShadeColor != nil && len(ps) > 0 {
c.SetColor(*pts.ShadeColor)
minY := trY(plt.Y.Min)
var pa vg.Path
pa.Move(ps[0].X, minY)
for i := range pts.XYs {
pa.Line(ps[i].X, ps[i].Y)
}
pa.Line(ps[len(pts.XYs)-1].X, minY)
pa.Close()
c.Fill(pa)
}
c.StrokeLines(pts.LineStyle, c.ClipLinesXY(ps)...)
}
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, y})
}
}
}
func (b *BoxPlot) Plot(c draw.Canvas, plt *plot.Plot) {
trX, trY := plt.Transforms(&c)
x := trX(b.Location)
if !c.ContainsX(x) {
return
}
x += b.Offset
med := trY(b.Median)
q1 := trY(b.Quartile1)
q3 := trY(b.Quartile3)
aLow := trY(b.AdjLow)
aHigh := trY(b.AdjHigh)
box := c.ClipLinesY([]draw.Point{
{x - b.Width/2, q1},
{x - b.Width/2, q3},
{x + b.Width/2, q3},
{x + b.Width/2, q1},
{x - b.Width/2 - b.BoxStyle.Width/2, q1},
})
c.StrokeLines(b.BoxStyle, box...)
medLine := c.ClipLinesY([]draw.Point{
{x - b.Width/2, med},
{x + b.Width/2, med},
})
c.StrokeLines(b.MedianStyle, medLine...)
cap := b.CapWidth / 2
whisks := c.ClipLinesY([]draw.Point{{x, q3}, {x, aHigh}},
[]draw.Point{{x - cap, aHigh}, {x + cap, aHigh}},
[]draw.Point{{x, q1}, {x, aLow}},
[]draw.Point{{x - cap, aLow}, {x + cap, aLow}})
c.StrokeLines(b.WhiskerStyle, whisks...)
for _, out := range b.Outside {
y := trY(b.Value(out))
if c.ContainsY(y) {
c.DrawGlyphNoClip(b.GlyphStyle, draw.Point{x, y})
}
}
}