repo_description: D2 is a modern diagram scripting language that turns text to diagrams.
repo_topics: developer-tools diagramming diagrams go golang software-architecture text-to-diagram
code: package shape
  
  import (
  	"math"
  
  	"oss.terrastruct.com/d2/lib/geo"
  	"oss.terrastruct.com/util-go/go2"
  )
  
  type shapeCircle struct {
  	*baseShape
  }
  
  func NewCircle(box *geo.Box) Shape {
  	shape := shapeCircle{
  		baseShape: &baseShape{
  			Type: CIRCLE_TYPE,
  			Box:  box,
  		},
  	}
  	shape.FullShape = go2.Pointer(Shape(shape))
  	return shape
  }
  
  func (s shapeCircle) GetInnerBox() *geo.Box {
  	width := s.Box.Width
  	height := s.Box.Height
  	insideTL := s.GetInsidePlacement(width, height, 0, 0)
  	tl := s.Box.TopLeft.Copy()
  	width -= 2 * (insideTL.X - tl.X)
  	height -= 2 * (insideTL.Y - tl.Y)
  	return geo.NewBox(&insideTL, width, height)
  }
  
  func (s shapeCircle) AspectRatio1() bool {
  	return true
  }
  
  func (s shapeCircle) GetDimensionsToFit(width, height, paddingX, paddingY float64) (float64, float64) {
  	length := math.Max(width+paddingX, height+paddingY)
  	diameter := math.Ceil(math.Sqrt2 * length)
  	return diameter, diameter
  }
  
  func (s shapeCircle) GetInsidePlacement(width, height, paddingX, paddingY float64) geo.Point {
  	r := s.GetBox().Width / 2
  	halfLength := r * math.Sqrt2 / 2.
  	p := geo.Point{
  		X: s.GetBox().TopLeft.X + math.Ceil(r-halfLength+paddingX/2.),
  		Y: s.GetBox().TopLeft.Y + math.Ceil(r-halfLength+paddingY/2.),
  	}
  	return p
  }
  
  func (s shapeCircle) Perimeter() []geo.Intersectable {
  	return []geo.Intersectable{geo.NewEllipse(s.Box.Center(), s.Box.Width/2, s.Box.Height/2)}
  }
  
  func (s shapeCircle) GetDefaultPadding() (paddingX, paddingY float64) {
  	return defaultPadding / math.Sqrt2, defaultPadding / math.Sqrt2
  }
  