gregoryv/draw

package shape

import (
    "io"

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

func NewCircle(radius int) *Circle {
    return &Circle{
        Radius: radius,
        class:  "circle",
    }
}

type Circle struct {
    xy.Point
    Radius int
    class  string
}

func (c *Circle) Width() int {
    stroke := 1
    return (c.Radius+stroke)*2 - 2
}
func (c *Circle) Height() int           { return c.Width() }
func (c *Circle) Direction() Direction  { return DirectionRight }
func (c *Circle) SetClass(class string) { c.class = class }

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

func (c *Circle) Edge(start xy.Point) xy.Point {
    return boxEdge(start, c)
}