Add math functions for govaluate expressions

pkg/pattern/template/point.go

@@ -3,6 +3,7 @@ package template
 import (
 	"errors"
 	"fmt"
+	"maps"
 	"math"
 	"strconv"
 
@@ -40,7 +41,9 @@ type Point struct {
 var ErrInvalidPointID = errors.New("type cannot be converted to a PointID")
 
 func (p Points) Functions(pat *pattern.Pattern) map[string]govaluate.ExpressionFunction {
-	return map[string]govaluate.ExpressionFunction{
+	functions := p.evaluationFunctions()
+
+	maps.Copy(functions, map[string]govaluate.ExpressionFunction{
 		"DistanceBetween": func(args ...interface{}) (interface{}, error) {
 			if len(args) != 2 {
 				return nil, fmt.Errorf("function DistanceBetween() requires 2 arguments: %w",
@@ -66,7 +69,35 @@ func (p Points) Functions(pat *pattern.Pattern) map[string]govaluate.ExpressionF
 
 			return points[0].Vector().AngleBetween(points[1].Vector()), nil
 		},
-	}
+		"YDistanceBetween": func(args ...interface{}) (interface{}, error) {
+			if len(args) != 2 {
+				return nil, fmt.Errorf("function DistanceBetween() requires 2 arguments: %w",
+					ErrInvalidArguments)
+			}
+
+			points, err := p.getOrCreateFromArgs(pat, args...)
+			if err != nil {
+				return nil, err
+			}
+
+			return points[0].Vector().Y - points[1].Vector().Y, nil
+		},
+		"XDistanceBetween": func(args ...interface{}) (interface{}, error) {
+			if len(args) != 2 {
+				return nil, fmt.Errorf("function DistanceBetween() requires 2 arguments: %w",
+					ErrInvalidArguments)
+			}
+
+			points, err := p.getOrCreateFromArgs(pat, args...)
+			if err != nil {
+				return nil, err
+			}
+
+			return points[0].Vector().X - points[1].Vector().X, nil
+		},
+	})
+
+	return functions
 }
 
 func (p Points) getOrCreateFromArgs(pat *pattern.Pattern, args ...interface{}) ([]point.Point, error) {