// 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 plot.Plotter interface.
func (g *Grid) Plot(c draw.Canvas, plt *plot.Plot) {
trX, trY := plt.Transforms(&c)
if g.Vertical.Color == nil {
goto horiz
}
for _, tk := range plt.X.Tick.Marker.Ticks(plt.X.Min, plt.X.Max) {
if tk.IsMinor() {
continue
}
x := trX(tk.Value)
c.StrokeLine2(g.Vertical, x, c.Min.Y, x, c.Min.Y+c.Size().Y)
}
horiz:
if g.Horizontal.Color == nil {
return
}
for _, tk := range plt.Y.Tick.Marker.Ticks(plt.Y.Min, plt.Y.Max) {
if tk.IsMinor() {
continue
}
y := trY(tk.Value)
c.StrokeLine2(g.Horizontal, c.Min.X, y, c.Min.X+c.Size().X, y)
}
}
func (b *QuartPlot) 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 := draw.Point{x, trY(b.Median)}
q1 := trY(b.Quartile1)
q3 := trY(b.Quartile3)
aLow := trY(b.AdjLow)
aHigh := trY(b.AdjHigh)
c.StrokeLine2(b.WhiskerStyle, x, aHigh, x, q3)
if c.ContainsY(med.Y) {
c.DrawGlyphNoClip(b.MedianStyle, med)
}
c.StrokeLine2(b.WhiskerStyle, x, aLow, x, q1)
ostyle := b.MedianStyle
ostyle.Radius = b.MedianStyle.Radius / 2
for _, out := range b.Outside {
y := trY(b.Value(out))
if c.ContainsY(y) {
c.DrawGlyphNoClip(ostyle, draw.Point{x, y})
}
}
}
// Plot implements the Plot method of the plot.Plotter interface.
func (h *Contour) Plot(c draw.Canvas, plt *plot.Plot) {
if naive {
h.naivePlot(c, plt)
return
}
var pal []color.Color
if h.Palette != nil {
pal = h.Palette.Colors()
}
trX, trY := plt.Transforms(&c)
// Collate contour paths and draw them.
//
// The alternative naive approach is to draw each line segment as
// conrec returns it. The integrated path approach allows graphical
// optimisations and is necessary for contour fill shading.
cp := contourPaths(h.GridXYZ, h.Levels, trX, trY)
// ps is a palette scaling factor to scale the palette uniformly
// across the given levels. This enables a discordance between the
// number of colours and the number of levels. Sorting is not
// necessary since contourPaths sorts the levels as a side effect.
ps := float64(len(pal)-1) / (h.Levels[len(h.Levels)-1] - h.Levels[0])
if len(h.Levels) == 1 {
ps = 0
}
for i, z := range h.Levels {
if math.IsNaN(z) {
continue
}
for _, pa := range cp[z] {
if isLoop(pa) {
pa.Close()
}
style := h.LineStyles[i%len(h.LineStyles)]
var col color.Color
switch {
case z < h.Min:
col = h.Underflow
case z > h.Max:
col = h.Overflow
case len(pal) == 0:
col = style.Color
default:
col = pal[int((z-h.Levels[0])*ps+0.5)] // Apply palette scaling.
}
if col != nil && style.Width != 0 {
c.SetLineStyle(style)
c.SetColor(col)
c.Stroke(pa)
}
}
}
}
// 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)...)
}
// 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)
}
}
// Plot implements the Plotter interface, drawing labels.
func (l *Labels) Plot(c draw.Canvas, p *plot.Plot) {
trX, trY := p.Transforms(&c)
for i, label := range l.Labels {
x := trX(l.XYs[i].X)
y := trY(l.XYs[i].Y)
if !c.Contains(draw.Point{x, y}) {
continue
}
x += l.XOffset
y += l.YOffset
c.FillText(l.TextStyle, x, y, l.XAlign, l.YAlign, label)
}
}
// 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)...)
}
}
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})
}
}
}
// Plot implements the Plot method of the plot.Plotter interface.
func (bs *Bubbles) Plot(c draw.Canvas, plt *plot.Plot) {
trX, trY := plt.Transforms(&c)
c.SetColor(bs.Color)
for _, d := range bs.XYZs {
x := trX(d.X)
y := trY(d.Y)
if !c.Contains(draw.Point{x, y}) {
continue
}
rad := bs.radius(d.Z)
// draw a circle centered at x, y
var p vg.Path
p.Move(x+rad, y)
p.Arc(x, y, rad, 0, 2*math.Pi)
p.Close()
c.Fill(p)
}
}
// 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)...)
}
// Plot implements the Plot method of the plot.Plotter interface.
func (h *HeatMap) Plot(c draw.Canvas, plt *plot.Plot) {
pal := h.Palette.Colors()
if len(pal) == 0 {
panic("heatmap: empty palette")
}
// ps scales the palette uniformly across the data range.
ps := float64(len(pal)-1) / (h.Max - h.Min)
trX, trY := plt.Transforms(&c)
var pa vg.Path
cols, rows := h.GridXYZ.Dims()
for i := 0; i < cols; i++ {
var right, left float64
switch i {
case 0:
right = (h.GridXYZ.X(i+1) - h.GridXYZ.X(i)) / 2
left = -right
case cols - 1:
right = (h.GridXYZ.X(i) - h.GridXYZ.X(i-1)) / 2
left = -right
default:
right = (h.GridXYZ.X(i+1) - h.GridXYZ.X(i)) / 2
left = -(h.GridXYZ.X(i) - h.GridXYZ.X(i-1)) / 2
}
for j := 0; j < rows; j++ {
v := h.GridXYZ.Z(i, j)
if math.IsNaN(v) || math.IsInf(v, 0) {
continue
}
pa = pa[:0]
var up, down float64
switch j {
case 0:
up = (h.GridXYZ.Y(j+1) - h.GridXYZ.Y(j)) / 2
down = -up
case rows - 1:
up = (h.GridXYZ.Y(j) - h.GridXYZ.Y(j-1)) / 2
down = -up
default:
up = (h.GridXYZ.Y(j+1) - h.GridXYZ.Y(j)) / 2
down = -(h.GridXYZ.Y(j) - h.GridXYZ.Y(j-1)) / 2
}
x, y := trX(h.GridXYZ.X(i)+left), trY(h.GridXYZ.Y(j)+down)
dx, dy := trX(h.GridXYZ.X(i)+right), trY(h.GridXYZ.Y(j)+up)
if !c.Contains(draw.Point{x, y}) || !c.Contains(draw.Point{dx, dy}) {
continue
}
pa.Move(x, y)
pa.Line(dx, y)
pa.Line(dx, dy)
pa.Line(x, dy)
pa.Close()
var col color.Color
switch {
case v < h.Min:
col = h.Underflow
case v > h.Max:
col = h.Overflow
default:
col = pal[int((v-h.Min)*ps+0.5)] // Apply palette scaling.
}
if col != nil {
c.SetColor(col)
c.Fill(pa)
}
}
}
}
// naivePlot implements the a naive rendering approach for contours.
// It is here as a debugging mode since it simply draws line segments
// generated by conrec without further computation.
func (h *Contour) naivePlot(c draw.Canvas, plt *plot.Plot) {
var pal []color.Color
if h.Palette != nil {
pal = h.Palette.Colors()
}
trX, trY := plt.Transforms(&c)
// Sort levels prior to palette scaling since we can't depend on
// sorting as a side effect from calling contourPaths.
sort.Float64s(h.Levels)
// ps is a palette scaling factor to scale the palette uniformly
// across the given levels. This enables a discordance between the
// number of colours and the number of levels.
ps := float64(len(pal)-1) / (h.Levels[len(h.Levels)-1] - h.Levels[0])
if len(h.Levels) == 1 {
ps = 0
}
levelMap := make(map[float64]int)
for i, z := range h.Levels {
levelMap[z] = i
}
// Draw each line segment as conrec generates it.
var pa vg.Path
conrec(h.GridXYZ, h.Levels, func(_, _ int, l line, z float64) {
if math.IsNaN(z) {
return
}
pa = pa[:0]
x1, y1 := trX(l.p1.X), trY(l.p1.Y)
x2, y2 := trX(l.p2.X), trY(l.p2.Y)
if !c.Contains(draw.Point{x1, y1}) || !c.Contains(draw.Point{x2, y2}) {
return
}
pa.Move(x1, y1)
pa.Line(x2, y2)
pa.Close()
style := h.LineStyles[levelMap[z]%len(h.LineStyles)]
var col color.Color
switch {
case z < h.Min:
col = h.Underflow
case z > h.Max:
col = h.Overflow
case len(pal) == 0:
col = style.Color
default:
col = pal[int((z-h.Levels[0])*ps+0.5)] // Apply palette scaling.
}
if col != nil && style.Width != 0 {
c.SetLineStyle(style)
c.SetColor(col)
c.Stroke(pa)
}
})
}
// Plot draws the Scatter, implementing the plot.Plotter
// interface.
func (pts *Scatter) Plot(c draw.Canvas, plt *plot.Plot) {
trX, trY := plt.Transforms(&c)
for _, p := range pts.XYs {
c.DrawGlyph(pts.GlyphStyle, draw.Point{trX(p.X), trY(p.Y)})
}
}