renderers

package
v1.0.3 Latest Latest
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 Go to latest Published: Dec 3, 2024 License: MIT Imports: 27 Imported by: 0

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Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func AVIF 

func AVIF(opts ...interface{}) canvas.Writer

AVIF returns a AVIF writer that uses libaom and accepts the following options: canvas.Resolution, canvas.Colorspace, github.com/Kagami/go-avif.*Options

func BMP 

func BMP(opts ...interface{}) canvas.Writer

BMP returns a BMP writer and accepts the following options: canvas.Resolution, canvas.Colorspace

func EPS 

func EPS(opts ...interface{}) canvas.Writer

EPS returns a Encapsulated PostScript writer and accepts the following options: canvas/renderers/ps.*Options

func GIF 

func GIF(opts ...interface{}) canvas.Writer

GIF returns a GIF writer and accepts the following options: canvas.Resolution, canvas.Colorspace, image/gif.*Options

func JPEG 

func JPEG(opts ...interface{}) canvas.Writer

JPEG returns a JPEG writer and accepts the following options: canvas.Resolution, canvas.Colorspace, image/jpeg.*Options

func NewGoChart 

func NewGoChart(writer canvas.Writer) func(int, int) (chart.Renderer, error)

NewGoChart returns a new github.com/wcharczuk/go-chart renderer.

func NewGonumPlot 

func NewGonumPlot(r canvas.Renderer) draw.Canvas

NewGonumPlot returns a new github.com/gonum/plot/vg renderer.

func PDF 

func PDF(opts ...interface{}) canvas.Writer

PDF returns a PDF writer and accepts the following options: canvas/renderers/pdf.*Options

func PNG 

func PNG(opts ...interface{}) canvas.Writer

PNG returns a PNG writer and accepts the following options: canvas.Resolution, canvas.Colorspace, image/png.Encoder

func PS 

func PS(opts ...interface{}) canvas.Writer

PS returns a PostScript writer and accepts the following options: canvas/renderers/ps.*Options

func SVG 

func SVG(opts ...interface{}) canvas.Writer

SVG returns an SVG writer and accepts the following options: canvas/renderers/svg.*Options

func SVGZ 

func SVGZ(opts ...interface{}) canvas.Writer

SVGZ returns a GZIP compressed SVG writer and accepts the following options: canvas/renderers/svgsvg.*Options

func TIFF 

func TIFF(opts ...interface{}) canvas.Writer

TIFF returns a TIFF writer and accepts the following options: canvas.Resolution, canvas.Colorspace, golang.org/x/image/tiff.*Options

func TeX 

func TeX(opts ...interface{}) canvas.Writer

TeX returns a TeX writer.

func WebP 

func WebP(opts ...interface{}) canvas.Writer

WebP returns a Webp writer that uses libwebp and accepts the following options: canvas.Resolution, canvas.Colorspace, github.com/kolesa-team/go-webp/encoder.*Options

func Write 

func Write(filename string, c *canvas.Canvas, opts ...interface{}) error

Write renders the canvas and writes to a file. A renderer is chosen based on the filename extension. The options will be passed to the respective renderer. Supported extensions: .(png|jpe?g|gif|tiff?|bmp|webp|avif|svgz?|pdf|tex|pgf|ps|eps).

Types

type GoChart 

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

GoChart is a github.com/wcharczuk/go-chart renderer.

func (*GoChart) ArcTo 

func (r *GoChart) ArcTo(cx, cy int, rx, ry, startAngle, delta float64)

ArcTo draws an arc with a given center (cx,cy) a given set of radii (rx,ry), a startAngle and delta (in radians).

func (*GoChart) Circle 

func (r *GoChart) Circle(radius float64, x, y int)

Circle draws a circle at the given coords with a given radius.

func (*GoChart) ClearTextRotation 

func (r *GoChart) ClearTextRotation()

ClearTextRotation clears rotation.

func (*GoChart) Close 

func (r *GoChart) Close()

Close finalizes a shape as drawn by LineTo.

func (*GoChart) Fill 

func (r *GoChart) Fill()

Fill fills the path, but does not stroke.

func (*GoChart) FillStroke 

func (r *GoChart) FillStroke()

FillStroke fills and strokes a path.

func (*GoChart) GetDPI 

func (r *GoChart) GetDPI() float64

GetDPI gets the DPI for the renderer.

func (*GoChart) LineTo 

func (r *GoChart) LineTo(x, y int)

LineTo both starts a shape and draws a line to a given point from the previous point.

func (*GoChart) MeasureText 

func (r *GoChart) MeasureText(body string) chart.Box

MeasureText measures text.

func (*GoChart) MoveTo 

func (r *GoChart) MoveTo(x, y int)

MoveTo moves the cursor to a given point.

func (*GoChart) QuadCurveTo 

func (r *GoChart) QuadCurveTo(cx, cy, x, y int)

QuadCurveTo draws a quad curve. cx and cy represent the Bézier control points.

func (*GoChart) ResetStyle 

func (r *GoChart) ResetStyle()

ResetStyle resets any style related settings of the renderer.

func (*GoChart) Save 

func (r *GoChart) Save(w io.Writer) error

Save writes the image to the given writer.

func (*GoChart) SetClassName 

func (r *GoChart) SetClassName(name string)

SetClassName sets the current class name.

func (*GoChart) SetDPI 

func (r *GoChart) SetDPI(dpi float64)

SetDPI sets the DPI for the renderer.

func (*GoChart) SetFillColor 

func (r *GoChart) SetFillColor(col drawing.Color)

SetFillColor sets the current fill color.

func (*GoChart) SetFont 

func (r *GoChart) SetFont(f *truetype.Font)

SetFont sets a font for a text field.

func (*GoChart) SetFontColor 

func (r *GoChart) SetFontColor(col drawing.Color)

SetFontColor sets a font's color.

func (*GoChart) SetFontSize 

func (r *GoChart) SetFontSize(size float64)

SetFontSize sets the font size for a text field.

func (*GoChart) SetStrokeColor 

func (r *GoChart) SetStrokeColor(col drawing.Color)

SetStrokeColor sets the current stroke color.

func (*GoChart) SetStrokeDashArray 

func (r *GoChart) SetStrokeDashArray(dashArray []float64)

SetStrokeDashArray sets the stroke dash array.

func (*GoChart) SetStrokeWidth 

func (r *GoChart) SetStrokeWidth(width float64)

SetStrokeWidth sets the stroke width.

func (*GoChart) SetTextRotation 

func (r *GoChart) SetTextRotation(radian float64)

SetTextRotation sets a rotation for drawing elements.

func (*GoChart) Stroke 

func (r *GoChart) Stroke()

Stroke strokes the path.

func (*GoChart) Text 

func (r *GoChart) Text(body string, x, y int)

Text draws a text blob.

type GonumPlot 

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

GonumPlot is a github.com/gonum/plot/vg renderer.

func (*GonumPlot) DrawImage 

func (r *GonumPlot) DrawImage(rect vg.Rectangle, img image.Image)

DrawImage draws the image, scaled to fit the destination rectangle.

func (*GonumPlot) Fill 

func (r *GonumPlot) Fill(path vg.Path)

Fill fills the given path.

func (*GonumPlot) FillString 

func (r *GonumPlot) FillString(f gonumFont.Face, pt vg.Point, text string)

FillString fills in text at the specified location using the given font. If the font size is zero, the text is not drawn.

func (*GonumPlot) Pop 

func (r *GonumPlot) Pop()

Pop restores the context saved by the corresponding call to Push().

func (*GonumPlot) Push 

func (r *GonumPlot) Push()

Push saves the current line width, the current dash pattern, the current transforms, and the current color onto a stack so that the state can later be restored by calling Pop().

func (*GonumPlot) Rotate 

func (r *GonumPlot) Rotate(rad float64)

Rotate applies a rotation transform to the context. The parameter is specified in radians.

func (*GonumPlot) Scale 

func (r *GonumPlot) Scale(x, y float64)

Scale applies a scaling transform to the context

func (*GonumPlot) SetColor 

func (r *GonumPlot) SetColor(col color.Color)

SetColor sets the current drawing color. Note that fill color and stroke color are the same, so if you want different fill and stroke colors then you must set a color, draw fills, set a new color and then draw lines.

The initial color is black. If SetColor is called with a nil color then black is used.

func (*GonumPlot) SetLineDash 

func (r *GonumPlot) SetLineDash(pattern []vg.Length, offset vg.Length)

SetLineDash sets the dash pattern for lines. The pattern slice specifies the lengths of alternating dashes and gaps, and the offset specifies the distance into the dash pattern to start the dash.

The initial dash pattern is a solid line.

func (*GonumPlot) SetLineWidth 

func (r *GonumPlot) SetLineWidth(length vg.Length)

SetLineWidth sets the width of stroked paths. If the width is not positive then stroked lines are not drawn.

The initial line width is 1 point.

func (*GonumPlot) Size 

func (r *GonumPlot) Size() (vg.Length, vg.Length)

Size returns the width and height of the canvas.

func (*GonumPlot) Stroke 

func (r *GonumPlot) Stroke(path vg.Path)

Stroke strokes the given path.

func (*GonumPlot) Translate 

func (r *GonumPlot) Translate(pt vg.Point)

Translate applies a translational transform to the context.

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