plot

type Axis struct {
	// Min and Max are the minimum and maximum data
	// values represented by the axis.
	Min, Max float64

	Label struct {
		// Text is the axis label string.
		Text string

		// Padding is the distance between the label and the axis.
		Padding vg.Length

		// TextStyle is the style of the axis label text.
		// For the vertical axis, one quarter turn
		// counterclockwise will be added to the label
		// text before drawing.
		TextStyle text.Style

		// Position is where the axis label string should be drawn.
		// The default value is draw.PosCenter, displaying the label
		// at the center of the axis.
		// Valid values are [-1,+1], with +1 being the far right/top
		// of the axis, and -1 the far left/bottom of the axis.
		Position float64
	}

	// LineStyle is the style of the axis line.
	draw.LineStyle

	// Padding between the axis line and the data.  Having
	// non-zero padding ensures that the data is never drawn
	// on the axis, thus making it easier to see.
	Padding vg.Length

	Tick struct {
		// Label is the TextStyle on the tick labels.
		Label text.Style

		// LineStyle is the LineStyle of the tick lines.
		draw.LineStyle

		// Length is the length of a major tick mark.
		// Minor tick marks are half of the length of major
		// tick marks.
		Length vg.Length

		// Marker returns the tick marks.  Any tick marks
		// returned by the Marker function that are not in
		// range of the axis are not drawn.
		Marker Ticker
	}

	// Scale transforms a value given in the data coordinate system
	// to the normalized coordinate system of the axis—its distance
	// along the axis as a fraction of the axis range.
	Scale Normalizer

	// AutoRescale enables an axis to automatically adapt its minimum
	// and maximum boundaries, according to its underlying Ticker.
	AutoRescale bool
}

type ConstantTicks []Tick

type DataRanger interface {
	// DataRange returns the range of X and Y values.
	DataRange() (xmin, xmax, ymin, ymax float64)
}

type DefaultTicks struct{}

type GlyphBox struct {
	// The glyph location in normalized coordinates.
	X, Y float64

	// Rectangle is the offset of the glyph's minimum drawing
	// point relative to the glyph location and its size.
	vg.Rectangle
}

type GlyphBoxer interface {
	GlyphBoxes(*Plot) []GlyphBox
}

type InvertedScale struct{ Normalizer }

type Legend struct {
	// TextStyle is the style given to the legend
	// entry texts.
	TextStyle text.Style

	// Padding is the amount of padding to add
	// between each entry in the legend.  If Padding
	// is zero then entries are spaced based on the
	// font size.
	Padding vg.Length

	// Top and Left specify the location of the legend.
	// If Top is true the legend is located along the top
	// edge of the plot, otherwise it is located along
	// the bottom edge.  If Left is true then the legend
	// is located along the left edge of the plot, and the
	// text is positioned after the icons, otherwise it is
	// located along the right edge and the text is
	// positioned before the icons.
	Top, Left bool

	// XOffs and YOffs are added to the legend's
	// final position.
	XOffs, YOffs vg.Length

	// YPosition specifies the vertical position of a legend entry.
	// Valid values are [-1,+1], with +1 being the top of the
	// entry vertical space, and -1 the bottom.
	YPosition float64

	// ThumbnailWidth is the width of legend thumbnails.
	ThumbnailWidth vg.Length
	// contains filtered or unexported fields
}

type LinearScale struct{}

type LogScale struct{}

type LogTicks struct {
	// Prec specifies the precision of tick rendering
	// according to the documentation for strconv.FormatFloat.
	Prec int
}

type Normalizer interface {
	// Normalize transforms a value x in the data coordinate system to
	// the normalized coordinate system.
	Normalize(min, max, x float64) float64
}

type Plot struct {
	Title struct {
		// Text is the text of the plot title.  If
		// Text is the empty string then the plot
		// will not have a title.
		Text string

		// Padding is the amount of padding
		// between the bottom of the title and
		// the top of the plot.
		Padding vg.Length

		// TextStyle specifies how the plot title text should be displayed.
		TextStyle text.Style
	}

	// BackgroundColor is the background color of the plot.
	// The default is White.
	BackgroundColor color.Color

	// X and Y are the horizontal and vertical axes
	// of the plot respectively.
	X, Y Axis

	// Legend is the plot's legend.
	Legend Legend

	// TextHandler parses and formats text according to a given
	// dialect (Markdown, LaTeX, plain, ...)
	// The default is a plain text handler.
	TextHandler text.Handler
	// contains filtered or unexported fields
}

type Plotter interface {
	// Plot draws the data to a draw.Canvas.
	Plot(draw.Canvas, *Plot)
}

type Thumbnailer interface {
	// Thumbnail draws an thumbnail representing
	// a legend entry.  The thumbnail will usually show
	// a smaller representation of the style used
	// to plot the corresponding data.
	Thumbnail(c *draw.Canvas)
}

type Tick struct {
	// Value is the data value marked by this Tick.
	Value float64

	// Label is the text to display at the tick mark.
	// If Label is an empty string then this is a minor
	// tick mark.
	Label string
}

type Ticker interface {
	// Ticks returns Ticks in a specified range
	Ticks(min, max float64) []Tick
}

type TickerFunc func(min, max float64) []Tick

type TimeTicks struct {
	// Ticker is used to generate a set of ticks.
	// If nil, DefaultTicks will be used.
	Ticker Ticker

	// Format is the textual representation of the time value.
	// If empty, time.RFC3339 will be used
	Format string

	// Time takes a float64 value and converts it into a time.Time.
	// If nil, UTCUnixTime is used.
	Time func(t float64) time.Time
}