/**
* @param file
* @return
* @throws FileNotFoundException
* @throws UnsupportedEncodingException
*/
private static SvgFile createBackgroundFile(File file)
throws UnsupportedEncodingException, FileNotFoundException {
SvgFile svg = new SvgFile(file, MAG);
svg.desc("DrawTrails of automics data, " + new Date());
svg.print("<filter id=\"desaturate\" primitiveUnits=\"objectBoundingBox\">");
// svg.print("<feImage x=\""+(500-width/2)+"\" y=\""+(500-width/2)+"\" width=\""+width+"\"
// height=\""+width+"\" xlink:href=\"altontowers-zoom15.png\"/>");
svg.print(
"<feImage x=\"0%\" y=\"0%\" width=\"100%\" height=\"100%\" xlink:href=\"altontowers-zoom15.png\"/>");
svg.print(
"<feColorMatrix type=\"matrix\" values=\"0.3333 0.3333 0.3333 0 0 "
+ "0.3333 0.3333 0.3333 0 0 "
+ "0.3333 0.3333 0.3333 0 0 "
+ "0 0 0 1 0\"/>");
svg.print(
"<feColorMatrix type=\"matrix\" values=\"0.3 0 0 0 0.7 "
+ "0 0.3 0 0 0.7 "
+ "0 0 0.3 0 0.7 "
+ "0 0 0 1 0\"/>");
svg.print("</filter>");
// zoom level - 2^zoom level tiles in x & y
int zoom = 15;
double imageWidth = 2 * Mercator.mercX(180) / Math.pow(2, zoom) * 640 / 256;
svg.print(
"<rect x=\""
+ MAG * SCALE * 0.5 * (1 - imageWidth / width)
+ "\" y=\""
+ MAG * SCALE * 0.5 * (1 - imageWidth / width)
+ "\" width=\""
+ MAG * SCALE * (imageWidth / width)
+ "\" height=\""
+ MAG * SCALE * (imageWidth / width)
+ "\" filter=\"url(#desaturate)\"/>");
return svg;
}
