wchart

package module
v0.0.0-...-d64bbd6 Latest Latest
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 Go to latest Published: Mar 16, 2022 License: BSD-2-Clause Imports: 3 Imported by: 0

README

wchart

syscall/js bindings for Chart.js

Documentation

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func Init 

func Init()

Types

type Chart 

type Chart struct {
	js.Value
}

func NewChart 

func NewChart(ctx js.Value, config *Config) Chart

func (Chart) Decimate 

func (c Chart) Decimate(mod int)

Decimate keeps every mod'th point of all datasets. This can be used to improve rendering performance on graphs with many points. Higher mod values yield more aggressive decimation, with mod=2 being the least aggressive possible discarding 1 of every two sample points. mod must be greater than 1. Example: mod=10 discards 9 of every 10 points.

func (Chart) GetConfig 

func (c Chart) GetConfig() ConfigHandle

func (Chart) IsHidden 

func (c Chart) IsHidden(datasetIdx int) bool

IsHidden returns true if dataset hidden property is set to true.

func (Chart) IsHiddenMeta 

func (c Chart) IsHiddenMeta(datasetIdx int) js.Value

IsHiddenMeta is null until user clicks on legend, then it is set to true if user has hidden dataset, or false if dataset is visible.

func (Chart) SetLabels 

func (c Chart) SetLabels(newLabels []string)

func (Chart) Update 

func (c Chart) Update()

type Clip 

type Clip struct {
	Left   float64 `js:"left"`
	Top    float64 `js:"top"`
	Right  float64 `js:"right"`
	Bottom float64 `js:"bottom"`
}

type Config 

type Config struct {
	Type    string   `js:"type"`
	Data    Data     `js:"data"`
	Options *Options `js:"options"`
}

type ConfigHandle 

type ConfigHandle struct {
	js.Value
}

func (ConfigHandle) AppendFloats 

func (ch ConfigHandle) AppendFloats(label string, data []float64)

func (ConfigHandle) ClearChartData 

func (ch ConfigHandle) ClearChartData()

ClearChartData destroys dataset `data` fields and config data.labels and sets them to empty array

func (ConfigHandle) Datasets 

func (ch ConfigHandle) Datasets() []DatasetHandle

func (ConfigHandle) SetAnimation 

func (ch ConfigHandle) SetAnimation(enableAnimation bool)

SetAnimation enables or disables animations for the chart. Usually used for performance reasons or when animations are distracting.

func (ConfigHandle) SetPointRadius 

func (ch ConfigHandle) SetPointRadius(pointRadius float64)

SetPointRadius sets the point radius of the chart. Set to zero for performance gains.

func (ConfigHandle) SetShowLine 

func (ch ConfigHandle) SetShowLine(enableShowLine bool)

SetShowLine enables/disables line drawing for the chart.

func (ConfigHandle) SetSpanGaps 

func (ch ConfigHandle) SetSpanGaps(enableSpanGaps bool)

SetSpanGaps If you have a lot of data points, it can be more performant to enable spanGaps. This disables segmentation of the line, which can be an unneeded step.

type Data 

type Data struct {
	Datasets []Dataset `js:"datasets"`
	Labels   []string  `js:"labels"`
}

type Dataset 

type Dataset struct {
	Data            js.Value `js:"data"`
	BackgroundColor js.Value `js:"backgroundColor"`
	BorderColor     js.Value `js:"borderColor"`
	Color           js.Value `js:"color"`
	// The label for the dataset which appears in the legend and tooltips.
	Label string `js:"label"`
	// How to clip relative to chartArea. Positive value allows overflow, negative value clips that many pixels inside chartArea. 0 = clip at chartArea.
	// Clipping can also be configured per side: clip: {left: 5, top: false, right: -2, bottom: 0}
	Clip Clip `js:"clip"`
	// The drawing order of dataset. Also affects order for stacking, tooltip and legend.
	Order int `js:"order"`
	// The ID of the group to which this dataset belongs to (when stacked, each group will be a separate stack). Defaults to dataset `type`.
	Stack    string `js:"stack"`
	Parsing  bool   `js:"parsing"`
	Hidden   bool   `js:"hidden"`
	SpanGaps bool   `js:"spanGaps"`
}

type DatasetHandle 

type DatasetHandle struct {
	js.Value
}

func (DatasetHandle) AppendFloat 

func (dh DatasetHandle) AppendFloat(f float64)

func (DatasetHandle) SetAnimation 

func (dh DatasetHandle) SetAnimation(enableAnimation bool)

SetAnimation enables or disables animations for the dataset. Usually used for performance reasons or when animations are distracting.

func (DatasetHandle) SetBackgroundColor 

func (dh DatasetHandle) SetBackgroundColor(c color.Color)

func (DatasetHandle) SetBorderColor 

func (dh DatasetHandle) SetBorderColor(c color.Color)

SetBorderColor sets outline color of the chart data.

func (DatasetHandle) SetColor 

func (dh DatasetHandle) SetColor(c color.Color)

SetColor sets font color

func (DatasetHandle) SetData 

func (dh DatasetHandle) SetData(ydata []float64)

func (DatasetHandle) SetHidden 

func (dh DatasetHandle) SetHidden(hidden bool)

SetHidden hides/shows dataset data in chart.

func (DatasetHandle) SetPointRadius 

func (dh DatasetHandle) SetPointRadius(pointRadius float64)

SetPointRadius sets the point radius of dataset. Set to zero for performance gains.

func (DatasetHandle) SetSpanGaps 

func (dh DatasetHandle) SetSpanGaps(enableSpanGaps bool)

SetSpanGaps if the dataset has a lot of data points, it can be more performant to enable spanGaps. This disables segmentation of the line, which can be an unneeded step.

type LabelledXYer 

type LabelledXYer interface {
	XYer
	Label() string
}

func LabelXYer 

func LabelXYer(label string, xyer XYer) LabelledXYer

type LinePlot 

type LinePlot struct {
	Chart
}

func NewLineFromXYers 

func NewLineFromXYers(ctx js.Value, xyers ...XYer) LinePlot

NewLineFromXYers plots several XYers on a plot. If an xyer implements the LabelledXYer interface then the dataset is labelled.

type Options 

type Options struct {
	Animation bool     `js:"animation"`
	Scales    js.Value `js:"scales"`
	Plugins   js.Value `js:"plugins"`
}

func (*Options) AddPlugins 

func (o *Options) AddPlugins(plugins ...Plugin)

type Plugin 

type Plugin interface {
	// contains filtered or unexported methods
}

type PluginTitle 

type PluginTitle struct {
	Text    string `js:"text"`
	Display bool   `js:"display"`
	Align   string `js:"align"`
}

type RealtimeLinePlot 

type RealtimeLinePlot struct {
	Chart
}

func NewRealtimeLinePlot 

func NewRealtimeLinePlot(ctx js.Value, xLabels []string, datasets []Dataset) RealtimeLinePlot

func (RealtimeLinePlot) AddData 

func (r RealtimeLinePlot) AddData(xLabel string, data []float64)

Call Update after calling AddData to update graph. data must be of length

func (RealtimeLinePlot) ClearChartData 

func (r RealtimeLinePlot) ClearChartData()

ClearChartData removes all data from chart.

type XYer 

type XYer interface {
	XY(int) (x, y float64)
	Len() int
}

Source Files

View all Source files

Directories

Path Synopsis
examples
lineplot
realtime
title

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