How to draw border circle, not filled ?

[jdemaria22]

HI guys ,

I need to create a circle not filled (only borders),

I was investigating and i have this code that create the circle:

func DrawCircle(screen *ebiten.Image, x float32, y float32, radius float32, clr color.RGBA) {
var path vector.Path

path.MoveTo(x, y)
path.Arc(x, y, radius, 0, math.Pi*2, vector.Clockwise)

vertices, indices := path.AppendVerticesAndIndicesForFilling(nil, nil)

redScaled := float32(clr.R) / 255
greenScaled := float32(clr.G) / 255
blueScaled := float32(clr.B) / 255
alphaScaled := float32(clr.A) / 255

for i := range vertices {
	v := &vertices[i]

	v.ColorR = redScaled
	v.ColorG = greenScaled
	v.ColorB = blueScaled
	v.ColorA = alphaScaled
}

screen.DrawTrianglesShader(vertices, indices, simpleShader, &ebiten.DrawTrianglesShaderOptions{
	FillRule: ebiten.EvenOdd,
})

screen.DrawTrianglesShader(vertices, indices, simpleShader, nil)

}

simpleShader, err = ebiten.NewShader([]byte(`
	package gui

	func Fragment(position vec4, texCoord vec2, color vec4) vec4 {
		return color
	}
`))

What do I have wrong in the code that i'ts draw fill included?

Thanks!

[hajimehoshi]

What about using two circles by calling Arc twice so that the path will be a donut?

[jdemaria22]

Thanks for answering,

I need a circle like this:

If i call Arc twice, draw a circle inside another?, but i need the inside of the circle to be transparent

[hajimehoshi]

Yes, this is what I intended and what the even-odd mode does.

[jdemaria22]

Thanks !!
That worked!!