gregoryv/draw

package shape

import (
    "io"

    "github.com/gregoryv/draw/xy"
    "github.com/gregoryv/nexus"
)

func NewDot() *Dot {
    return &Dot{
        Radius: 6,
        class:  "dot",
    }
}

type Dot struct {
    x, y   int
    Radius int
    class  string
}

func (d *Dot) Position() (x int, y int) { return d.x, d.y }
func (d *Dot) SetX(x int)               { d.x = x }
func (d *Dot) SetY(y int)               { d.y = y }

func (d *Dot) Width() int {
    return d.Radius * 2
}
func (d *Dot) Height() int           { return d.Width() }
func (d *Dot) Direction() Direction  { return DirectionRight }
func (d *Dot) SetClass(class string) { d.class = class }

func (d *Dot) WriteSVG(out io.Writer) error {
    w, err := nexus.NewPrinter(out)
    x, y := d.Position()
    x += d.Radius
    y += d.Radius
    w.Printf(
        `<circle class="%s" cx="%v" cy="%v" r="%v" />\n`,
        d.class, x, y, d.Radius,
    )
    return *err
}

func (d *Dot) Edge(start xy.Point) xy.Point {
    return boxEdge(start, d)
}