28 lines
507 B
Go
28 lines
507 B
Go
package profilebtn
|
|
|
|
import (
|
|
"image"
|
|
"image/color"
|
|
)
|
|
|
|
type circle struct {
|
|
p image.Point
|
|
r int
|
|
}
|
|
|
|
func (c *circle) ColorModel() color.Model {
|
|
return color.AlphaModel
|
|
}
|
|
|
|
func (c *circle) Bounds() image.Rectangle {
|
|
return image.Rect(c.p.X-c.r, c.p.Y-c.r, c.p.X+c.r, c.p.Y+c.r)
|
|
}
|
|
|
|
func (c *circle) At(x, y int) color.Color {
|
|
xx, yy, rr := float64(x-c.p.X)+0.5, float64(y-c.p.Y)+0.5, float64(c.r)
|
|
if xx*xx+yy*yy < rr*rr {
|
|
return color.Alpha{255}
|
|
}
|
|
return color.Alpha{0}
|
|
}
|