Google Earth API Samples - Polygon Styling

Relevant Resources:

• KmlPolygon Reference
• KmlStyle Reference
• KmlPolyStyle Reference
• KmlColor Reference

Relevant Code Excerpt:

// If polygonPlacemark doesn't already have a Style associated
// with it, we create it now.
if (!polygonPlacemark.getStyleSelector()) {
  polygonPlacemark.setStyleSelector(ge.createStyle(''));
}

// The Style of a Feature is retrieved as
// feature.getStyleSelector().  The Style itself contains a
// LineStyle and a PolyStyle, which are what we manipulate to change
// the line color, line width, and inner color of the polygon.
var lineStyle = polygonPlacemark.getStyleSelector().getLineStyle();
lineStyle.setWidth(lineStyle.getWidth() + 2);
// Color is specified in 'aabbggrr' format.
lineStyle.getColor().set('66ff0000');

// Color can also be specified by individual color components.
var polyColor = 
  polygonPlacemark.getStyleSelector().getPolyStyle().getColor();
polyColor.setA(200);
polyColor.setB(0);
polyColor.setG(255);
polyColor.setR(255);