package main import ( "math/rand" "sync" "github.com/hajimehoshi/ebiten/v2" ) type gameCreep struct { x, y float64 sprite *ebiten.Image moveX, moveY float64 tick int nextAction int level *Level health int sync.Mutex } func NewCreep(sprite *ebiten.Image, level *Level) *gameCreep { return &gameCreep{ x: float64(1 + rand.Intn(108)), y: float64(1 + rand.Intn(108)), sprite: sprite, level: level, health: 1, } } func (c *gameCreep) doNextAction() { c.moveX = (rand.Float64() - 0.5) / 7 c.moveY = (rand.Float64() - 0.5) / 7 if c.x <= 2 && c.moveX < 0 { c.moveX *= 1 } else if c.x >= float64(c.level.w-3) && c.moveX > 0 { c.moveX *= 1 } if c.y <= 2 && c.moveY > 0 { c.moveY *= 1 } else if c.y >= float64(c.level.h-3) && c.moveY < 0 { c.moveY *= 1 } c.nextAction = 400 + rand.Intn(400) } func (c *gameCreep) Update() { c.Lock() defer c.Unlock() if c.health == 0 { return } c.tick++ if c.tick >= c.nextAction { c.doNextAction() c.tick = 0 } x, y := c.x+c.moveX, c.y+c.moveY clampX, clampY := c.level.Clamp(x, y) c.x, c.y = clampX, clampY if clampX != x || clampY != y { c.nextAction = 0 } } func (c *gameCreep) Position() (float64, float64) { c.Lock() defer c.Unlock() return c.x, c.y }