public static StringBuilder GetLegendJson(string serviceUri)
{
StringBuilder result = new StringBuilder();
result.Append("[");
MapServerProxy proxy = new MapServerProxy(serviceUri);
string mapName = proxy.GetDefaultMapName();
ImageType imageType = new ImageType();
imageType.ImageFormat = esriImageFormat.esriImageBMP;
imageType.ImageReturnType = esriImageReturnType.esriImageReturnMimeData;
MapServerLegendInfo[] legends = proxy.GetLegendInfo(mapName, null, null, imageType);
if (legends != null && legends.Length > 0) {
bool firstLegend = true;
foreach (MapServerLegendInfo legend in legends) {
if (firstLegend) {
firstLegend = false;
} else {
result.Append(",");
}
result.Append("{");
if (legend.Name.Length > 0) {
result.Append("\"Name\":\"");
result.Append(legend.Name);
result.Append("\",");
}
result.Append("\"Groups\":[");
bool firstGroup = true;
foreach (MapServerLegendGroup group in legend.LegendGroups) {
if (firstGroup) {
firstGroup = false;
} else {
result.Append(",");
}
result.Append("{");
if (group.Heading.Length > 0) {
result.Append("\"Heading\":\"");
result.Append(group.Heading);
result.Append("\",");
}
result.Append("\"Entries\":[");
bool firstEntry = true;
for (int i = 0; i < group.LegendClasses.Length; i += 1) {
MapServerLegendClass legendClass = group.LegendClasses[i];
if (firstEntry) {
firstEntry = false;
} else {
result.Append(",");
}
result.Append("{\"Label\":\"");
result.Append(legendClass.Label);
result.Append("\",");
Bitmap colors = new Bitmap(new System.IO.MemoryStream(legendClass.SymbolImage.ImageData));
//colors.Save(@"E:\arcgisserver\arcgisoutput\Class" + (i++).ToString() + ".jpg");
System.Drawing.Color lc = colors.GetPixel(2, 2);
result.Append("\"LineColor\":{\"r\":");
result.Append(lc.R);
result.Append(",\"g\":");
result.Append(lc.G);
result.Append(",\"b\":");
result.Append(lc.B);
result.Append("},");
int sampleX = colors.Width / 2;
int sampleY;
if (group.LegendClasses.Length == 1) {
sampleY = colors.Height / 2;
} else {
sampleY = (int)(3 + ((colors.Height - 6) * (i / (group.LegendClasses.Length - 1.0))));
}
System.Drawing.Color fc = colors.GetPixel(sampleX, sampleY);
result.Append("\"FillColor\":{\"r\":");
result.Append(fc.R);
result.Append(",\"g\":");
result.Append(fc.G);
result.Append(",\"b\":");
result.Append(fc.B);
result.Append("}}");
}
result.Append("]}");
}
result.Append("]}");
}
result.Append("]");
}
return result;
}
