Shape

A library for drawing common shapes like: line, circle, rectangle and more.

Line

shape.Line{a,b,...}.Stroke(color, width, gtx)

Circle

shape.Circle{c,r}.Stroke(color, width, gtx)
shape.Circle{c,r}.Fill(color, gtx)

Rectangle

shape.Rectangle{a,b}.Stroke(color, width, gtx)
shape.Rectangle{a,b}.Fill(color, gtx)

Triangle

shape.Triangle{a,b,c}.Stroke(color, width, gtx)
shape.Triangle{a,b,c}.Fill(color, gtx)

Curve

shape.Curve{a,b,...}.Stroke(color, width,gtx)

Points

...

Example Draw Red Line

func drawLine(gtx *layout.Context) {
    red := color.RGBA{255,0,0,255}
    s := gtx.Constraints
    w, h := float32(s.Width.Max), float32(s.Height.Max)
    shape.Line{{0,h/2},{w,h/2}}.Stroke(red, width, gtx)
}

See in example folder for gio application with more examples of shapes.

Read More

• Drawing Antialiased Lines with OpenGL