gochart

package module

v0.0.0-...-5c470e4 Latest Latest Go to latest Published: Aug 12, 2021 License: MIT Imports: 8 Imported by: 0

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Repository

github.com/lucas-inacio/gochart

Links

Open Source Insights

README ¶

gochart

Simple chart implementation using fyne and gg libraries

Dependencies

gg (https://github.com/fogleman/gg)
fyne (https://github.com/fyne-io/fyne)

Functionality

Currently only BarChart and LineChart are provided. More types can be created by embedding BaseChart and implementing the required methods:

Required by Chart interface

      // A "contructor" like NewAwesomeChart should be created as well
      BeginDraw(dc *gg.Context, x, y float64)
      DrawPoint(dc *gg.Context, x, y, yOffset float64, int, image.Rectangle)
      EndDraw(dc *gg.Context)

Required by Fyne (follow the guidelines at Extending Widgets) for more information:

      CreateRenderer() fyne.WidgetRenderer

Documentation ¶

Index ¶

func SetFont(path string, points float64) error
type BarChart
- func NewBarChart(w, h int) *BarChart
type BaseChart
- func NewBaseChart(w, h int) *BaseChart
type Chart
type ChartRenderer
type LineChart
- func NewLineChart(w, h int) *LineChart

Constants ¶

This section is empty.

Variables ¶

This section is empty.

Functions ¶

func SetFont ¶

func SetFont(path string, points float64) error

Types ¶

type BarChart ¶

type BarChart struct {
	BaseChart
}

func NewBarChart ¶

func NewBarChart(w, h int) *BarChart

func (*BarChart) BeginDraw ¶

func (c *BarChart) BeginDraw(dc *gg.Context, x, y float64)

func (*BarChart) CreateRenderer ¶

func (l *BarChart) CreateRenderer() fyne.WidgetRenderer

func (*BarChart) DrawPoint ¶

func (c *BarChart) DrawPoint(dc *gg.Context, x, y, yOffset float64, pointCount int, rect image.Rectangle)

func (*BarChart) EndDraw ¶

func (c *BarChart) EndDraw(dc *gg.Context)

type BaseChart ¶

type BaseChart struct {
	widget.BaseWidget
	Screen image.Image
	// contains filtered or unexported fields
}

func NewBaseChart ¶

func NewBaseChart(w, h int) *BaseChart

func (*BaseChart) BeginDraw ¶

func (c *BaseChart) BeginDraw(dc *gg.Context, x, y float64)

func (*BaseChart) CreateRenderer ¶

func (l *BaseChart) CreateRenderer() fyne.WidgetRenderer

func (*BaseChart) DragEnd ¶

func (c *BaseChart) DragEnd()

func (*BaseChart) Dragged ¶

func (c *BaseChart) Dragged(event *fyne.DragEvent)

Events A minimum implementation is provided so the cursor is is tracked when it's over the chart area

func (*BaseChart) DrawCursor ¶

func (c *BaseChart) DrawCursor(dc *gg.Context, ratioX float64)

func (*BaseChart) DrawFrame ¶

func (c *BaseChart) DrawFrame(dc *gg.Context, ratioX, ratioY, yOffset, height, width, xSpan, ySpan float64)

func (*BaseChart) DrawPoint ¶

func (c *BaseChart) DrawPoint(dc *gg.Context, x, y, yOffset float64, pointCount int, rect image.Rectangle)

func (*BaseChart) EndDraw ¶

func (c *BaseChart) EndDraw(dc *gg.Context)

func (*BaseChart) GetData ¶

func (c *BaseChart) GetData() ([]float64, []float64)

func (*BaseChart) GetGrowY ¶

func (c *BaseChart) GetGrowY() bool

func (*BaseChart) GetMargin ¶

func (c *BaseChart) GetMargin() float64

func (*BaseChart) GetMouse ¶

func (c *BaseChart) GetMouse() (float32, float32)

func (*BaseChart) GetScreen ¶

func (c *BaseChart) GetScreen() image.Image

func (*BaseChart) GetShowLabel ¶

func (c *BaseChart) GetShowLabel() bool

func (*BaseChart) ResizeIfNeeded ¶

func (c *BaseChart) ResizeIfNeeded(w, h int)

func (*BaseChart) SetData ¶

func (c *BaseChart) SetData(x, y []float64)

func (*BaseChart) SetGrowY ¶

func (c *BaseChart) SetGrowY(grow bool)

type Chart ¶

type Chart interface {
	fyne.Widget
	SetGrowY(grow bool)
	SetData(x, y []float64)

	BeginDraw(dc *gg.Context, x, y float64)
	DrawPoint(dc *gg.Context, x, y, yOffset float64, pointCount int, rect image.Rectangle)
	EndDraw(dc *gg.Context)

	DrawCursor(dc *gg.Context, ratioX float64)
	DrawFrame(dc *gg.Context, ratioX, ratioY, yOffset, height, width, xSpan, ySpan float64)

	ResizeIfNeeded(w, h int)

	GetData() ([]float64, []float64)
	GetScreen() image.Image
	GetGrowY() bool
	GetMargin() float64
	GetMouse() (float32, float32)
	GetShowLabel() bool
}

type ChartRenderer ¶

type ChartRenderer struct {
	// contains filtered or unexported fields
}

func (*ChartRenderer) Destroy ¶

func (l *ChartRenderer) Destroy()

func (*ChartRenderer) Layout ¶

func (l *ChartRenderer) Layout(size fyne.Size)

func (*ChartRenderer) MinSize ¶

func (l *ChartRenderer) MinSize() fyne.Size

func (*ChartRenderer) Objects ¶

func (l *ChartRenderer) Objects() []fyne.CanvasObject

func (*ChartRenderer) Refresh ¶

func (l *ChartRenderer) Refresh()

type LineChart ¶

type LineChart struct {
	BaseChart
}

func NewLineChart ¶

func NewLineChart(w, h int) *LineChart

func (*LineChart) BeginDraw ¶

func (c *LineChart) BeginDraw(dc *gg.Context, x, y float64)

func (*LineChart) CreateRenderer ¶

func (l *LineChart) CreateRenderer() fyne.WidgetRenderer

func (*LineChart) DrawPoint ¶

func (c *LineChart) DrawPoint(dc *gg.Context, x, y, yOffset float64, pointCount int, rect image.Rectangle)

func (*LineChart) EndDraw ¶

func (c *LineChart) EndDraw(dc *gg.Context)

Source Files ¶

View all Source files

Directories ¶

Path	Synopsis
examples
defaultcursors

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