Initial commit

simulation/xel.go

@@ -0,0 +1,69 @@
+package simulation
+
+import (
+	"math/rand/v2"
+)
+
+const (
+	TurnNorth int = iota
+	TurnEast
+	TurnSouth
+	TurnWest
+)
+
+type Xel struct {
+	Energy int64
+}
+
+func (xel *Xel) Step(ownPos Vector2, grid *XelGrid) {
+	// get other xel
+	var otherXelPos Vector2
+	switch rand.IntN(4) {
+	case 0:
+		otherXelPos = Vector2{X: ownPos.X + 1, Y: ownPos.Y}
+	case 1:
+		otherXelPos = Vector2{X: ownPos.X - 1, Y: ownPos.Y}
+	case 2:
+		otherXelPos = Vector2{X: ownPos.X, Y: ownPos.Y + 1}
+	case 3:
+		otherXelPos = Vector2{X: ownPos.X, Y: ownPos.Y - 1}
+	}
+	otherXel := grid.GetXel(otherXelPos)
+	if otherXel == nil { return }
+	// interact
+	if (xel.Energy > 0 && otherXel.Energy > 0) || (xel.Energy < 0 && otherXel.Energy < 0) {
+		if rand.IntN(4) == 0 {
+			// create a higher energy xel and an inverted xel
+			xel.Energy += (2 * otherXel.Energy)
+			otherXel.Energy *= -1
+		} else {
+			xel.Energy += otherXel.Energy
+			otherXel.Energy = 0
+		}
+		return
+	}
+	if (xel.Energy < 0 && otherXel.Energy > 0) || (xel.Energy > 0 && otherXel.Energy < 0) {
+		// cancel out
+		xel.Energy += otherXel.Energy
+		otherXel.Energy = 0
+		return
+	}
+	if (xel.Energy == 0 && otherXel.Energy != 0) || (xel.Energy != 0 && otherXel.Energy == 0) {
+		if xel.Energy > 1 || xel.Energy < -1 || otherXel.Energy > 1 || otherXel.Energy < -1 { // prevent integer 1 / 0
+			// split
+			splitE := (xel.Energy + otherXel.Energy) / 2
+			xel.Energy = splitE + ((xel.Energy + otherXel.Energy) % 2)
+			otherXel.Energy = splitE
+		} else {
+			// move
+			if xel.Energy != 0 {
+				otherXel.Energy = xel.Energy
+				xel.Energy = 0
+			} else {
+				xel.Energy = otherXel.Energy
+				otherXel.Energy = 0
+			}
+		}
+		return
+	}
+}