public void calcCorners() { ////////////////////////////////////////////////// calcCorners()
										//
	// Calculate the latlon coordinates of the top left and bottom right	//
	// corners of the icon assuming that the icon centre is placed		//
	// at the latlon position in this point. We use either the real world	//
	// width or height (whichever was last set) and set the other in	//
	// proportion. This preserves the aspect ratio of the icon when it	//
	// has been rescaled.							//
	//									//
	// This method assumes a circular earth and uses Great Circles to	//
	// calculate angles and distances for latitude distances (hieights).	//
	// It does the same for longitude distances (widths) but then applies	//
	// a factor to compensate for the fact that lines of longitude get	//
	// closer together on the ground as they approach the poles.		//
	// The factor is cos(latitude).						//
										//
	if (icon == null) return;						// No icon = bale out
										//
	float hDegs = 0.0f;							// Height (lat) adjustment
	float wDegs = 0.0f;							// Width (lon) adjustment
										//
	if (useWorldWidth && (worldWidth > 0.0)) {				// If have usable width
	    wDegs = ProjMath.sphericalUnitsToDeg(worldWidth, CIRCUM);		// Convert width to degrees
	    worldHeight = icon.getIconHeight() *				// Pix height -> world height
				(worldWidth / icon.getIconWidth());		//
	    hDegs = ProjMath.sphericalUnitsToDeg(worldHeight, CIRCUM);		// Convert height to degrees
	    }									//
	else if (useWorldHeight && (worldHeight > 0.0)) {			// Else if have useable height
	    hDegs = ProjMath.sphericalUnitsToDeg(worldHeight, CIRCUM);		// Convert height to degrees
	    worldWidth = icon.getIconWidth() *					// Pix width -> world width
				(worldHeight/ icon.getIconHeight());		//
	    wDegs = ProjMath.sphericalUnitsToDeg(worldWidth, CIRCUM);		// Convert width to degrees
	    }									//
										//
	wDegs /= Math.cos(ProjMath.degToRad(getLat()));				// Adjust for latitude
										//
	nwCorner.setLatLon(this);						// Start from centre
	nwCorner.translate(hDegs / 2.0f, -wDegs / 2.0f);			// Translate NW corner by half
	seCorner.setLatLon(this);						// Start from centre
	seCorner.translate(-hDegs / 2.0f, wDegs / 2.0f);			// Translate SE corner by half
										//
	} //////////////////////////////////////////////////////////////////////// End of calcCorners()