png

Documentation

Index

• Constants
• Variables
• func Description() map[string]types.FunctionDescription
• func EvalExprGraph(ctx context.Context, e parser.Expr, from, until int32, ...) ([]*types.MetricData, error)
• func MarshalPNG(params PictureParams, results []*types.MetricData) ([]byte, error)
• func MarshalPNGRequest(r *http.Request, results []*types.MetricData, templateName string) ([]byte, error)
• func MarshalPNGRequestErr(r *http.Request, errStr string, templateName string) ([]byte, error)
• func MarshalSVG(params PictureParams, results []*types.MetricData) ([]byte, error)
• func MarshalSVGRequest(r *http.Request, results []*types.MetricData, templateName string) ([]byte, error)
• func SetColor(name, rgba string) error
• func SetTemplate(name string, params PictureParams)
• type AreaMode
• type FontSlant
• type FontWeight
• type LineMode
• type PictureParams
  • func GetPictureParams(r *http.Request, metricData []*types.MetricData) PictureParams
  • func GetPictureParamsWithTemplate(r *http.Request, template string, metricData []*types.MetricData) PictureParams
• type PieMode
• type YAxisSide

Constants

const HaveGraphSupport = false

Variables

var DefaultColorList = []string{"blue", "green", "red", "purple", "brown", "yellow", "aqua", "grey", "magenta", "pink", "gold", "rose"}

var DefaultParams = PictureParams{
	Width:      330,
	Height:     250,
	Margin:     10,
	LogBase:    0,
	FgColor:    "white",
	BgColor:    "black",
	MajorLine:  "rose",
	MinorLine:  "grey",
	FontName:   "Sans",
	FontSize:   10,
	FontBold:   FontWeightNormal,
	FontItalic: FontSlantNormal,

	GraphOnly:  false,
	HideLegend: false,
	HideGrid:   false,
	HideAxes:   false,
	HideYAxis:  false,
	HideXAxis:  false,
	YAxisSide:  YAxisSideLeft,

	Title:       "",
	Vtitle:      "",
	VtitleRight: "",

	Tz: time.Local,

	ConnectedLimit: math.MaxInt32,
	LineMode:       LineModeSlope,
	AreaMode:       AreaModeNone,
	AreaAlpha:      math.NaN(),
	PieMode:        PieModeAverage,
	LineWidth:      1.2,
	ColorList:      DefaultColorList,

	YMin:    math.NaN(),
	YMax:    math.NaN(),
	YStep:   math.NaN(),
	XMin:    math.NaN(),
	XMax:    math.NaN(),
	XStep:   math.NaN(),
	XFormat: "",
	MinorY:  1,

	UniqueLegend:   false,
	DrawNullAsZero: false,
	DrawAsInfinite: false,

	YMinLeft:    math.NaN(),
	YMinRight:   math.NaN(),
	YMaxLeft:    math.NaN(),
	YMaxRight:   math.NaN(),
	YStepL:      math.NaN(),
	YStepR:      math.NaN(),
	YLimitLeft:  math.NaN(),
	YLimitRight: math.NaN(),

	YUnitSystem: "si",
	YDivisors:   []float64{4, 5, 6},

	RightWidth:  1.2,
	RightDashed: false,
	RightColor:  "",
	LeftWidth:   1.2,
	LeftDashed:  false,
	LeftColor:   "",

	MajorGridLineColor: "white",
	MinorGridLineColor: "grey",
}

Functions

func Description

func Description() map[string]types.FunctionDescription

func EvalExprGraph

func EvalExprGraph(ctx context.Context, e parser.Expr, from, until int32, values map[parser.MetricRequest][]*types.MetricData, getTargetData interfaces.GetTargetData) ([]*types.MetricData, error)

func MarshalPNG

func MarshalPNG(params PictureParams, results []*types.MetricData) ([]byte, error)

func MarshalPNGRequest

func MarshalPNGRequest(r *http.Request, results []*types.MetricData, templateName string) ([]byte, error)

func MarshalPNGRequestErr

func MarshalPNGRequestErr(r *http.Request, errStr string, templateName string) ([]byte, error)

func MarshalSVG

func MarshalSVG(params PictureParams, results []*types.MetricData) ([]byte, error)

func MarshalSVGRequest

func MarshalSVGRequest(r *http.Request, results []*types.MetricData, templateName string) ([]byte, error)

func SetColor

func SetColor(name, rgba string) error

func SetTemplate

func SetTemplate(name string, params PictureParams)

SetTemplate adds a picture param template with specified name and parameters

Types

type AreaMode

type AreaMode int

const (
	AreaModeNone AreaMode = 1 << iota
	AreaModeFirst
	AreaModeAll
	AreaModeStacked
)

type FontSlant

type FontSlant int

const (
	FontSlantNormal FontSlant = iota
	FontSlantItalic
	FontSlantOblique
)

type FontWeight

type FontWeight int

const (
	FontWeightNormal FontWeight = iota
	FontWeightBold
)

type LineMode

type LineMode int

const (
	LineModeSlope LineMode = 1 << iota
	LineModeStaircase
	LineModeConnected
)

type PictureParams

type PictureParams struct {
	PixelRatio float64
	Width      float64
	Height     float64
	Margin     int
	LogBase    float64
	FgColor    string
	BgColor    string
	MajorLine  string
	MinorLine  string
	FontName   string
	FontSize   float64
	FontBold   FontWeight
	FontItalic FontSlant

	GraphOnly  bool
	HideLegend bool
	HideGrid   bool
	HideAxes   bool
	HideYAxis  bool
	HideXAxis  bool
	YAxisSide  YAxisSide

	Title       string
	Vtitle      string
	VtitleRight string

	Tz *time.Location

	ConnectedLimit int
	LineMode       LineMode
	AreaMode       AreaMode
	AreaAlpha      float64
	PieMode        PieMode
	LineWidth      float64
	ColorList      []string

	YMin    float64
	YMax    float64
	XMin    float64
	XMax    float64
	YStep   float64
	XStep   float64
	MinorY  int
	XFormat string

	YMaxLeft    float64
	YLimitLeft  float64
	YMaxRight   float64
	YLimitRight float64
	YMinLeft    float64
	YMinRight   float64
	YStepL      float64
	YStepR      float64

	UniqueLegend   bool
	DrawNullAsZero bool
	DrawAsInfinite bool

	YUnitSystem string
	YDivisors   []float64

	RightWidth  float64
	RightDashed bool
	RightColor  string
	LeftWidth   float64
	LeftDashed  bool
	LeftColor   string

	MinorGridLineColor string
	MajorGridLineColor string
}

func GetPictureParams

func GetPictureParams(r *http.Request, metricData []*types.MetricData) PictureParams

GetPictureParams returns PictureParams with default settings

func GetPictureParamsWithTemplate

func GetPictureParamsWithTemplate(r *http.Request, template string, metricData []*types.MetricData) PictureParams

GetPictureParamsWithTemplate returns PictureParams with specified template

type PieMode

type PieMode int

const (
	PieModeMaximum PieMode = 1 << iota
	PieModeMinimum
	PieModeAverage
)

type YAxisSide

type YAxisSide int

const (
	YAxisSideRight YAxisSide = 1 << iota
	YAxisSideLeft
)