topic Re: Transparency of graphics in ArcGIS JavaScript Maps SDK Questions

Transparency of graphics

TimWitt2 — Fri, 22 Aug 2014 14:44:24 GMT

Hey everybody,

Is there a way to change the transparency of a particular graphic or is this only possible for a graphic layer?

Tim

Re: Transparency of graphics

JakeSkinner — Fri, 22 Aug 2014 14:56:40 GMT

Hi Tim,

If the graphics is already created, you can use the setSymbol method to do this. Ex:

var symbol = new SimpleFillSymbol(SimpleFillSymbol.STYLE_SOLID,
        new SimpleLineSymbol(SimpleLineSymbol.STYLE_SOLID,
        new Color([255,0,0]), 2),new Color([255,255,0,0.25])
        )

map.graphics.graphics[2].setSymbol(symbol);

Re: Transparency of graphics

TimWitt2 — Fri, 22 Aug 2014 15:01:16 GMT

Thanks Jake!

Re: Transparency of graphics

KenBuja — Fri, 22 Aug 2014 15:04:28 GMT

You can change the transparency of the color you assign different graphics.

var trans = Math.random();

// lineSymbol used for freehand polyline, polyline and line.
var lineSymbol = new CartographicLineSymbol(
  CartographicLineSymbol.STYLE_SOLID,
  new Color([255, 0, 0, trans]), 10,
  CartographicLineSymbol.CAP_ROUND,
  CartographicLineSymbol.JOIN_MITER, 5
);

Re: Transparency of graphics

TimWitt2 — Fri, 22 Aug 2014 15:06:23 GMT

One more question, how does this work if my color is in Hex string?

Re: Transparency of graphics

KenBuja — Fri, 22 Aug 2014 15:09:50 GMT

According to the documentation, the transparency option is only available for RGB colors

Re: Transparency of graphics

TimWitt2 — Fri, 22 Aug 2014 15:11:04 GMT

Thanks Ken, I guess I need to change my color palette then to return RGB values.