Drawing a hollow circle

[nazariof]

Hello Guys,

 

 

Has anyone got experience on drawing a hollow circle with Pixi?, my current approach only works in the WebGL renderer which makes me think it's flawed, and i also need to fallback to the other rendered for other devices.

 

this.mathPiDub = 2 * Math.PI;

this.color = 0xFF00FF

var nuRad = 10;

this.pixiCircle.beginFill(this.color, 1);
this.pixiCircle.arc(0, 0, nuRad - 2, 0, this.mathPiDub, false);
this.pixiCircle.arc(0, 0, nuRad, 0, this.mathPiDub, false);
this.pixiCircle.endFill();

 

The 2D rendered gives me a full circle while the WebGL cuts the hole through.

 

What's the best approach?

 

Thanks!.

Naz.

 

 

[rich]

If you want a 'hollow' circle then just use the lineStroke and drawCircle. You're using beginFill, so it will always try to be filled.

[nazariof]

Thanks for your  reply Rich.

I'm aware of there being a lineStroke but due to other reasons i need to achieve what i request which is totally possible in other Graphics APIs like in Flash and CreateJS.

 

It's all related to the  Path Winding, and the clockwise property of the arc function helps achieving this but i still can't manage to have it work properly.

 

http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/display/GraphicsPathWinding.html

 

[nazariof]

Moare about Winding and Flash 

 

http://help.adobe.com/en_US/as3/dev/WS1EE3740D-F65C-43bf-9B12-74E34D7D1CBE.html

[msha]

You can do it with a standard canvas - http://stackoverflow.com/questions/8030069/how-to-draw-segment-of-a-donut-with-html5-canvas

Then generate a PIXI texture from that canvas.

 

The last time I tried to draw a hollow circle using pixi, it was buggy on some devices - https://github.com/GoodBoyDigital/pixi.js/issues/702

Maybe PIXI-s method of drawing circles and curves - triangulating them is not the optimal way and it would be better to do it with a fragment shader?...