support multi-module (#4)

* add multimodule
* re-package modules

server/internal/generator/map.go

@@ -0,0 +1,75 @@
+package generator
+
+import (
+	"fmt"
+	"math/rand"
+
+	"galaxy/util"
+
+	"github.com/iliadenisov/galaxy/server/internal/generator/plotter"
+)
+
+type Map struct {
+	Width       uint32
+	Height      uint32
+	HomePlanets []PlanetarySystem
+	FreePlanets []Planet
+	plotter     plotter.Plotter
+}
+
+type Coordinate struct {
+	X, Y float64
+}
+
+func NewMap(width, height, players uint32) (*Map, error) {
+	p, err := plotter.NewPlotter(width, height, defaultFactor)
+	if err != nil {
+		return nil, fmt.Errorf("NewPlotter: %s", err)
+	}
+	return &Map{
+		Width:       width,
+		Height:      height,
+		HomePlanets: make([]PlanetarySystem, players),
+		plotter:     p,
+	}, nil
+}
+
+func (m *Map) CreatePlanets(pc PlanetClass, num int, deadZoneRadius float64, size, resources func() float64) error {
+	for range num {
+		coord, err := m.NewCoordinate(deadZoneRadius)
+		if err != nil {
+			return err
+		}
+		planet := NewPlanet(pc, coord, size(), resources())
+		m.AddPlanet(planet)
+	}
+	return nil
+}
+
+func (m *Map) AddPlanet(planet Planet) {
+	m.FreePlanets = append(m.FreePlanets, planet)
+}
+
+func (m Map) NewCoordinate(deadZoneRaduis float64) (Coordinate, error) {
+	if x, y, err := m.plotter.RandomFreePoint(deadZoneRaduis); err != nil {
+		return Coordinate{}, fmt.Errorf("NewCoordinate: RandomFreePoint: %s", err)
+	} else {
+		return Coordinate{X: x, Y: y}, nil
+	}
+}
+
+func (m Map) ShortDistance(from, to Coordinate) float64 {
+	return util.ShortDistance(m.Width, m.Height, from.X, from.Y, to.X, to.Y)
+}
+
+// RandI returns a random float64 value between min and max
+func RandI(min, max float64) float64 {
+	return min + rand.Float64()*(max-min)
+}
+
+// RandIFn is a wrapper for the [RandI] func
+func RandIFn(min, max float64) func() float64 {
+	return func() float64 {
+		return RandI(min, max)
+	}
+}