openvg

package

v0.0.0-...-f136d1b Latest Latest Go to latest Published: Jul 2, 2015 License: MIT Imports: 9 Imported by: 0

Details

Valid go.mod file
Redistributable license
Tagged version
Stable version
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Repository

github.com/capnm/go_rpi

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Open Source Insights

Documentation ¶

Overview ¶

Package openvg is a high-level 2D vector graphics library built on OpenVG

Index ¶

func Arc(x, y, w, h, sa, aext float32, style ...string)
func Background(r, g, b uint8)
func BackgroundColor(s string, alpha ...float32)
func BackgroundRGB(r, g, b uint8, alpha float32)
func Cbezier(sx, sy, cx, cy, px, py, ex, ey float32, style ...string)
func Circle(x, y, r float32, style ...string)
func Ellipse(x, y, w, h float32, style ...string)
func End()
func FillColor(s string, alpha ...float32)
func FillLinearGradient(x1, y1, x2, y2 float32, ramp []Offcolor)
func FillRGB(r, g, b uint8, alpha float32)
func FillRadialGradient(cx, cy, fx, fy, radius float32, ramp []Offcolor)
func Finish()
func Image(x, y float32, w, h int, s string)
func Img(x, y float32, im image.Image)
func Init() (int, int)
func Line(x1, y1, x2, y2 float32, style ...string)
func Polygon(x, y []float32, style ...string)
func Polyline(x, y []float32, style ...string)
func Qbezier(sx, sy, cx, cy, ex, ey float32, style ...string)
func RawTerm()
func Rect(x, y, w, h float32, style ...string)
func RestoreTerm()
func Rotate(r float32)
func Roundrect(x, y, w, h, rw, rh float32, style ...string)
func SaveEnd(filename string)
func SaveTerm()
func Scale(x, y float32)
func Shear(x, y float32)
func Start(w, h int, color ...uint8)
func StartColor(w, h int, color string, alpha ...float32)
func StrokeColor(s string, alpha ...float32)
func StrokeRGB(r, g, b uint8, alpha float32)
func StrokeWidth(w float32)
func Text(x, y float32, s string, font string, size int, style ...string)
func TextEnd(x, y float32, s string, font string, size int, style ...string)
func TextMid(x, y float32, s string, font string, size int, style ...string)
func TextWidth(s string, font string, size int) float32
func Translate(x, y float32)
type Offcolor
type RGB

Constants ¶

This section is empty.

Variables ¶

This section is empty.

Functions ¶

func Arc ¶

func Arc(x, y, w, h, sa, aext float32, style ...string)

Arc draws an arc at (x,y) with dimensions (w,h). the arc starts at the angle sa, extended to aext

func Background ¶

func Background(r, g, b uint8)

Background clears the screen with the specified solid background color using RGB triples

func BackgroundColor ¶

func BackgroundColor(s string, alpha ...float32)

BackgroundColor sets the background color

func BackgroundRGB ¶

func BackgroundRGB(r, g, b uint8, alpha float32)

BackgroundRGB clears the screen with the specified background color using a RGBA quad

func Cbezier ¶

func Cbezier(sx, sy, cx, cy, px, py, ex, ey float32, style ...string)

Cbezier draws a cubic bezier curve with extrema (sx, sy) and (ex, ey). Control points at (cx, cy) and (px, py)

func Circle ¶

func Circle(x, y, r float32, style ...string)

Circle draws a circle centered at (x,y), with radius r

func Ellipse ¶

func Ellipse(x, y, w, h float32, style ...string)

Ellipse draws an ellipse at (x,y) with dimensions (w,h)

func End ¶

func End()

End ends the picture

func FillColor ¶

func FillColor(s string, alpha ...float32)

FillColor sets the fill color using names to specify the color, optionally applying alpha.

func FillLinearGradient ¶

func FillLinearGradient(x1, y1, x2, y2 float32, ramp []Offcolor)

FillLinearGradient sets up a linear gradient between (x1,y2) and (x2, y2) using the specified offsets and colors in ramp

func FillRGB ¶

func FillRGB(r, g, b uint8, alpha float32)

FillRGB sets the fill color, using RGB triples and alpha values

func FillRadialGradient ¶

func FillRadialGradient(cx, cy, fx, fy, radius float32, ramp []Offcolor)

FillRadialGradient sets up a radial gradient centered at (cx, cy), radius r, with a focal point at (fx, fy) using the specified offsets and colors in ramp

func Finish ¶

func Finish()

Finish shuts down the graphics subsystem

func Image ¶

func Image(x, y float32, w, h int, s string)

Image places the named image at (x,y) with dimensions (w,h) the derived image dimensions override the specified ones.

func Img ¶

func Img(x, y float32, im image.Image)

Img places an image object at (x,y)

func Init ¶

func Init() (int, int)

Init initializes the graphics subsystem

func Line ¶

func Line(x1, y1, x2, y2 float32, style ...string)

Line draws a line between two points

func Polygon ¶

func Polygon(x, y []float32, style ...string)

Polygon draws a polygon with coordinate in x,y

func Polyline ¶

func Polyline(x, y []float32, style ...string)

Polyline draws a polyline with coordinates in x, y

func Qbezier ¶

func Qbezier(sx, sy, cx, cy, ex, ey float32, style ...string)

Qbezier draws a quadratic bezier curve with extrema (sx, sy) and (ex, ey) Control points are at (cx, cy)

func RawTerm ¶

func RawTerm()

RawTerm sets the terminal to raw mode

func Rect ¶

func Rect(x, y, w, h float32, style ...string)

Rect draws a rectangle at (x,y) with dimesions (w,h)

func RestoreTerm ¶

func RestoreTerm()

RestoreTerm retores terminal settings

func Rotate ¶

func Rotate(r float32)

Rotate rotates the coordinate system around the specifed angle

func Roundrect ¶

func Roundrect(x, y, w, h, rw, rh float32, style ...string)

Roundrect draws a rounded rectangle at (x,y) with dimesions (w,h). the corner radii are at (rw, rh)

func SaveEnd ¶

func SaveEnd(filename string)

SaveEnd ends the picture, saving the raw raster

func SaveTerm ¶

func SaveTerm()

SaveTerm saves terminal settings

func Scale ¶

func Scale(x, y float32)

Scale scales the coordinate system by (x,y)

func Shear ¶

func Shear(x, y float32)

Shear warps the coordinate system by (x,y)

func Start ¶

func Start(w, h int, color ...uint8)

Start begins a picture

func StartColor ¶

func StartColor(w, h int, color string, alpha ...float32)

StartColor begins the picture with the specified color background

func StrokeColor ¶

func StrokeColor(s string, alpha ...float32)

StrokeColor sets the fill color using names to specify the color, optionally applying alpha.

func StrokeRGB ¶

func StrokeRGB(r, g, b uint8, alpha float32)

StrokeRGB sets the stroke color, using RGB triples

func StrokeWidth ¶

func StrokeWidth(w float32)

StrokeWidth sets the stroke width

func Text ¶

func Text(x, y float32, s string, font string, size int, style ...string)

Text draws text whose aligment begins (x,y)

func TextEnd ¶

func TextEnd(x, y float32, s string, font string, size int, style ...string)

TextEnd draws text end-aligned at (x,y)

func TextMid ¶

func TextMid(x, y float32, s string, font string, size int, style ...string)

TextMid draws text centered at (x,y)

func TextWidth ¶

func TextWidth(s string, font string, size int) float32

TextWidth returns the length of text at a specified font and size

func Translate ¶

func Translate(x, y float32)

Translate translates the coordinate system to (x,y)

Types ¶

type Offcolor ¶

type Offcolor struct {
	Offset float32
	RGB
	Alpha float32
}

Offcolor defines the offset, color and alpha values used in gradients the Offset ranges from 0..1, colors as RGB triples, alpha ranges from 0..1

type RGB ¶

type RGB struct {
	Red, Green, Blue uint8
}

RGB defines the red, green, blue triple that makes up colors.

Source Files ¶

View all Source files

openvg.go

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