google_jsgraph

type BarGraph struct {

	// The graph data
	Data GraphData

	// Palette consists of the RGB colors to use in the bar graph.
	// e.g []String{"FF0000", "00FF00", "0000FF"}
	Palette []string
}

type Graph interface {

	// Packages returns the Google javascript packages this graph depends on
	Packages() []string

	// WriteCode writes the code within the drawCharts() function that draws
	// this graph. name is the id of the div tag where this graph will go.
	// When Emit or MustEmit calls this, it provides a w that also implements
	// io.ByteWriter and io.StringWriter.
	WriteCode(name string, w io.Writer) error
}

type GraphData interface {

	// The number of X data points
	XLen() int

	// The number of Y data points
	YLen() int

	// The title of the X labels
	XTitle() string

	// Return 0-based label for X axis
	XLabel(x int) string

	// Return 0-based label for Y axis
	YLabel(y int) string

	// Return value at (x, y)
	Value(x, y int) float64
}

type PieGraph struct {

	// The graph data. YLen should be 1.
	Data GraphData

	// Optional: Palette consists of the RGB colors to use in the pie graph.
	// e.g []String{"FF0000", "00FF00", "0000FF"}. If omitted, Google chooses
	// the palette.
	Palette []string
}