Golang Canvas.StrokeLines方法代码示例

// 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 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)
	}
}

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},
		})
	}
}

// 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...)
}

// 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)...)
}

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...)
}

// 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)...)
}