improve Unit and utilities

unit.odin

@@ -3,6 +3,10 @@ package main
 import "util"
 import "vendor:sdl3"
 
+DEFAULT_HP :: 100
+DEFAULT_VELOCITY: util.Velocity : util.Velocity{x = 0, y = 0}
+DEFAULT_SPEED: f32 : 200
+
 Faction :: enum {
 	Player,
 	Allied,
@@ -13,6 +17,7 @@ Unit :: struct {
 	faction:  Faction,
 	position: util.Position,
 	velocity: util.Velocity,
+	speed:    f32,
 	hp:       u32,
 }
 
@@ -31,6 +36,24 @@ RenderUnit :: proc(unit: Unit, game: ^Game) {
 	)
 }
 
+NewUnit :: proc {
+	NewUnitBase,
+	NewUnitHp,
+	NewUnitAll
+}
+
+NewUnitBase :: proc(faction: Faction, position: util.Position) -> Unit {
+	return Unit{faction, position, DEFAULT_VELOCITY, DEFAULT_SPEED, DEFAULT_HP}
+}
+
+NewUnitHp :: proc(faction: Faction, position: util.Position, hp: u32) -> Unit {
+	return Unit{faction, position, DEFAULT_VELOCITY, DEFAULT_SPEED, hp}
+}
+
+NewUnitAll :: proc(faction: Faction, position: util.Position, speed: f32, hp: u32) -> Unit {
+	return Unit{faction, position, DEFAULT_VELOCITY, speed, hp}
+}
+
 Projectile :: struct {
 	faction:   Faction,
 	position:  util.Position,