// 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...)
}
}
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.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 draws the BoxPlot on Canvas c and Plot plt.
func (b *BoxPlot) Plot(c draw.Canvas, plt *plot.Plot) {
if b.Horizontal {
b := &horizBoxPlot{b}
b.Plot(c, plt)
return
}
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: x, Y: 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, y})
}
}
}
// draw draws the axis along the lower edge of a draw.Canvas.
func (a *horizontalAxis) draw(c draw.Canvas) {
y := c.Min.Y
if a.Label.Text != "" {
y -= a.Label.Font.Extents().Descent
c.FillText(a.Label.TextStyle, c.Center().X, y, -0.5, 0, a.Label.Text)
y += a.Label.Height(a.Label.Text)
}
marks := a.Tick.Marker.Ticks(a.Min, a.Max)
for _, t := range marks {
x := c.X(a.Norm(t.Value))
if !c.ContainsX(x) || t.IsMinor() {
continue
}
c.FillText(a.Tick.Label, x, y, -0.5, 0, t.Label)
}
if len(marks) > 0 {
y += tickLabelHeight(a.Tick.Label, marks)
} else {
y += a.Width / 2
}
if len(marks) > 0 && a.drawTicks() {
len := a.Tick.Length
for _, t := range marks {
x := c.X(a.Norm(t.Value))
if !c.ContainsX(x) {
continue
}
start := t.lengthOffset(len)
c.StrokeLine2(a.Tick.LineStyle, x, y+start, x, y+len)
}
y += len
}
c.StrokeLine2(a.LineStyle, c.Min.X, y, c.Max.X, y)
}