101 lines
1.9 KiB
Go
101 lines
1.9 KiB
Go
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package main
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import (
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"cart/w4"
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"math"
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)
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const enemyWidth = 8
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const enemyHeight = 8
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const enemyFlags = 1 // BLIT_2BPP
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var enemy = [16]byte{0x80, 0x80, 0xaa, 0x80, 0xa6, 0xa4, 0xa9, 0x9a, 0xaa, 0xaa, 0xaa, 0x9a, 0xaa, 0xa8, 0x20, 0x20}
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type Enemy struct {
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Position Vector
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Speed Vector
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Dead bool
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ShootTimer uint8
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}
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func (e *Enemy) GetPosition() Vector {
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return e.Position
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}
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func (e *Enemy) Update() bool {
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if e.Position.Y > 320 {
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return true
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}
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if e.Dead {
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e.Speed.Y = math.Min(e.Speed.Y+0.2, 4)
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}
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e.Position.MoveVec(e.Speed)
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if e.Position.X < 0 && e.Speed.X < 0 {
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e.Position.X = 0
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e.Speed.X *= -1
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}
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if e.Position.X > 320 && e.Speed.X > 0 {
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e.Position.X = 320
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e.Speed.X *= -1
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}
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if e.ShootTimer > 0 {
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e.ShootTimer--
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} else if e.Position.X > 0 && e.Position.X < 320 {
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e.ShootTimer = 180
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distance := math.MaxFloat64
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direction := Vector{}
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var player *Player
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for _, p := range players {
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if p.Health == 0 {
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continue
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}
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diff := p.Position.Sub(e.Position)
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dis := diff.LenSquared()
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if distance > dis {
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distance = dis
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player = p
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direction = diff.Normalized()
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}
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}
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if player != nil {
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sx := int8(direction.X*5) / 3
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sy := int8(direction.Y*5) / 3
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b := &Bullet{
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Position: e.Position,
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Owner: e,
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SpeedX: sx,
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SpeedY: sy,
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}
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w4.Tone(400|300<<16, 3, 5, w4.TONE_PULSE2)
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actors = append(actors, b)
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}
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}
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return false
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}
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func (e *Enemy) Draw() {
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*w4.DRAW_COLORS = 0x44
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var f uint = w4.BLIT_2BPP
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if e.Speed.X < 0 {
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f |= w4.BLIT_FLIP_X
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}
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*w4.DRAW_COLORS = 0x430
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w4.Blit(&enemy[0], int(e.Position.X)-camX-4, int(e.Position.Y)-camY-4, 8, 8, f)
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}
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func (e *Enemy) TakeHit(from Actor) {
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if e.Dead {
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return
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}
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if bullet, ok := from.(*Bullet); ok {
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if _, ok := bullet.Owner.(*Player); !ok {
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return
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}
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}
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enemies--
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kills++
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e.Dead = true
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e.Speed.Y = -3
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w4.Tone(300|200<<16, 5, 20, w4.TONE_PULSE2)
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}
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