/// <summary>
/// Merges the given newProperties with this one.
/// </summary>
/// <param name="newProperties"></param>
/// <returns></returns>
internal MapCSSRuleProperties Merge(MapCSSRuleProperties newProperties)
{
// determine the tightest zoom.
int minZoom = this.MinZoom;
int maxZoom = this.MaxZoom;
if (this.MinZoom < newProperties.MinZoom)
{
minZoom = newProperties.MinZoom;
}
if (this.MaxZoom > newProperties.MaxZoom)
{
maxZoom = newProperties.MaxZoom;
}
// create a new rule and merge properties from both.
var rule = new MapCSSRuleProperties(minZoom, maxZoom);
foreach (var key in this.GetKeys())
{
object value;
this.TryGetProperty(key, out value);
rule.AddProperty(key, value);
}
foreach (var key in newProperties.GetKeys())
{
object value;
newProperties.TryGetProperty(key, out value);
rule.AddProperty(key, value);
}
return(rule);
}
/// <summary>
/// Returns the ranged properties.
/// </summary>
/// <returns></returns>
public List <MapCSSRuleProperties> GetRanges()
{
var rules = new List <MapCSSRuleProperties>();
MapCSSRuleProperties currentRule = null;
string previousRuleString = string.Empty;
int minZoom = 0, maxZoom = 20;
for (int zoomLevel = 0; zoomLevel < 20; zoomLevel++)
{
// get the current rule string.
string currentRuleString = this.GetRuleStringForZoom(zoomLevel);
if (previousRuleString != currentRuleString)
{ // there is a new rule.
// store the previous rule.
if (currentRule != null)
{ // the current rule exists; store it.
currentRule.MinZoom = minZoom;
currentRule.MaxZoom = maxZoom + 1;
rules.Add(currentRule);
currentRule = null;
}
if (!string.IsNullOrWhiteSpace(currentRuleString))
{ // only do this part when string is not empty.
minZoom = zoomLevel; // set the min zoom.
MapCSSRuleProperties props = this.GetRulesForZoom(zoomLevel);
if (props != null)
{
currentRule = new MapCSSRuleProperties(minZoom, 20);
currentRule = currentRule.Merge(props);
}
}
previousRuleString = currentRuleString;
}
maxZoom = zoomLevel; // set the max zoom.
}
// store the previous rule.
if (currentRule != null)
{ // the current rule exists; store it.
currentRule.MinZoom = minZoom;
currentRule.MaxZoom = maxZoom + 1;
rules.Add(currentRule);
}
return(rules);
}
/// <summary>
/// Returns the rules for the given zoom.
/// </summary>
/// <param name="zoom"></param>
/// <returns></returns>
public MapCSSRuleProperties GetRulesForZoom(int zoom)
{
MapCSSRuleProperties rule = null;
for (int idx = 0; idx < _properties.Count; idx++)
{
if (_properties[idx].IsForZoom(zoom))
{
if (rule == null)
{
rule = new MapCSSRuleProperties(_properties[idx].MinZoom,
_properties[idx].MaxZoom);
rule = rule.Merge(_properties[idx]);
}
else
{
rule = rule.Merge(_properties[idx]);
}
}
}
return(rule);
}
/// <summary>
/// Adds the given properties to the ones already here.
/// </summary>
/// <param name="properties"></param>
public void AddProperties(MapCSSRuleProperties properties)
{
_properties.Add(properties);
}
/// <summary>
/// Returns true if the min/max zoom are equal.
/// </summary>
/// <param name="properties"></param>
/// <returns></returns>
public bool IsEqualForZoom(MapCSSRuleProperties properties)
{
return(this.IsEqualForZoom(
properties.MinZoom, properties.MaxZoom));
}