2019 Day 10 Complete

helpers/coordinate.go

@@ -0,0 +1,37 @@
+package aoc
+
+import (
+	"fmt"
+	"math"
+	"strings"
+)
+
+type Coordinate struct {
+	X, Y int
+}
+
+func CoordinateFromString(str string) *Coordinate {
+	c := Coordinate{}
+	r := strings.NewReader(str)
+	_, err := fmt.Fscanf(r, "[%d, %d]", c.X, c.Y)
+	if err != nil {
+		panic(err)
+	}
+	return &c
+}
+
+func (c Coordinate) Angle(t Coordinate) float64 {
+	ret := math.Atan2(float64(t.X-c.X), float64(c.Y-t.Y)) * 180 / math.Pi
+	if ret < 0 {
+		ret = ret + 360
+	}
+	return ret
+}
+
+func (c Coordinate) String() string {
+	return fmt.Sprintf("[%d, %d]", c.X, c.Y)
+}
+
+func (c Coordinate) Distance(t Coordinate) int {
+	return AbsInt(c.X-t.X) + AbsInt(c.Y-t.Y)
+}

helpers/helpers.go

@@ -27,6 +27,13 @@ const (
 	MIN_INT = -MAX_INT - 1
 )
 
+func AbsInt(i int) int {
+	if i < 0 {
+		return i * -1
+	}
+	return i
+}
+
 func ArgIsSet(a string) bool {
 	for i := range os.Args {
 		if os.Args[i] == a || strings.HasPrefix(os.Args[i], a+"=") {