private boolean allShowExtent(Field[] fields) {
// Categorical and numeric fields both show elements as extents on the axis
for (Field field : fields) {
if (field.isNumeric() && !field.isBinned()) return false;
}
return true;
}
private void setLocations(
ElementDefinition.ElementDimensionDefinition dim,
String dimName,
Field[] fields,
boolean categorical) {
String scaleName = "scale_" + dimName;
if (fields.length == 0) {
// There are no fields -- we have a notional [0,1] extent, so use the center of that
dim.center = "function() { return " + scaleName + "(0.5) }";
dim.left = "function() { return " + scaleName + "(0) }";
dim.right = "function() { return " + scaleName + "(1) }";
} else if (fields.length == 1) {
Field field = fields[0]; // The single field
String dataFunction = D3Util.writeCall(field); // A call to that field using the datum 'd'
if (isRange(field)) {
// This is a range field, but we have not been asked to show both ends,
// so we use the difference between the top and bottom
dim.center = "function(d) { return " + scaleName + "(" + dataFunction + ".extent()) }";
// Left and Right are not defined
} else if (field.isBinned() && !categorical) {
// A Binned value on a non-categorical axes
dim.center = "function(d) { return " + scaleName + "(" + dataFunction + ".mid) }";
dim.left = "function(d) { return " + scaleName + "(" + dataFunction + ".low) }";
dim.right = "function(d) { return " + scaleName + "(" + dataFunction + ".high) }";
} else {
// Nothing unusual -- just define the center
dim.center = "function(d) { return " + scaleName + "(" + dataFunction + ") }";
}
} else {
// The dimension contains two fields: a range
String lowDataFunc =
D3Util.writeCall(fields[0]); // A call to the low field using the datum 'd'
String highDataFunc =
D3Util.writeCall(fields[1]); // A call to the high field using the datum 'd'
// When one of the fields is a range, use the outermost value of that
if (isRange(fields[0])) lowDataFunc += ".low";
if (isRange(fields[1])) highDataFunc += ".high";
dim.left = "function(d) { return " + scaleName + "(" + lowDataFunc + ") }";
dim.right = "function(d) { return " + scaleName + "(" + highDataFunc + ") }";
dim.center =
"function(d) { return "
+ scaleName
+ "( ("
+ highDataFunc
+ " + "
+ lowDataFunc
+ " )/2) }";
}
}