Struct Sankey

plotter/sankey.go:24–71

A Sankey diagram presents stock and flow data as rectangles representing the amount of each stock and lines between the stocks representing the amount of each flow.

// the amount of each stock and lines between the stocks representing the
// amount of each flow.
type Sankey struct {
	// Color specifies the default fill
	// colors for the stocks and flows. If Color is not nil,
	// each stock and flow is rendered filled with Color,
	// otherwise no fill is performed. Colors can be
	// modified for individual stocks and flows.
	Color color.Color

	// StockBarWidth is the widths of the bars representing
	// the stocks. The default value is 15% larger than the
	// height of the stock label text.
	StockBarWidth vg.Length

	// LineStyle specifies the default border
	// line style for the stocks and flows. Styles can be
	// modified for individual stocks and flows.
	LineStyle draw.LineStyle

	// TextStyle specifies the default stock label
	// text style. Styles can be modified for
	// individual stocks.
	TextStyle text.Style

	flows []Flow

	// FlowStyle is a function that specifies the
	// background color and border line style of the
	// flow based on its group name. The default
	// function uses the default Color and LineStyle
	// specified above for all groups.
	FlowStyle func(group string) (color.Color, draw.LineStyle)

	// StockStyle is a function that specifies, for a stock
	// identified by its label and category, the label text
	// to be printed on the plot (lbl), the style of the text (ts),
	// the horizontal and vertical offsets for printing the text (xOff and yOff),
	// the color of the fill for the bar representing the stock (c),
	// and the style of the outline of the bar representing the stock (ls).
	// The default function uses the default TextStyle, color and LineStyle
	// specified above for all stocks; zero horizontal and vertical offsets;
	// and the stock label as the text to be printed on the plot.
	StockStyle func(label string, category int) (lbl string, ts text.Style, xOff, yOff vg.Length, c color.Color, ls draw.LineStyle)

	// stocks arranges the stocks by category.
	// The first key is the category and the seond
	// key is the label.
	stocks map[int]map[string]*stock
}

// StockRange returns the minimum and maximum value on the value axis
// for the stock with the specified label and category.