Zombie and health bar

zombie/zombie.go

@@ -0,0 +1,114 @@
+package zombie
+
+import (
+	"bytes"
+	"github.com/hajimehoshi/ebiten/v2"
+	"gitlab.com/kbr4/9heroja/configuration"
+	"gitlab.com/kbr4/9heroja/resources"
+	"image"
+	"log"
+	"time"
+)
+
+const WalkSpeedMs = 50
+
+var (
+	zombieImage *ebiten.Image
+	walkTicker  *time.Ticker
+)
+
+type Zombie struct {
+	step      int
+	direction configuration.Direction
+	IsWalking bool
+	X         float64
+	Y         float64
+	OffsetX   float64
+	OffsetY   float64
+}
+
+type spritePosition struct {
+	x int
+	y int
+}
+
+func (z *Zombie) DrawZombie(screen *ebiten.Image) {
+
+	// set movement positions to be hashmap of sprite positions for each direction
+
+	movementPositions := map[configuration.Direction][]spritePosition{}
+	movementPositions[configuration.North] = []spritePosition{
+		{0, 0},
+		{32, 0},
+		{64, 0},
+		{96, 0},
+	}
+	movementPositions[configuration.NorthEast] = movementPositions[configuration.North]
+	movementPositions[configuration.East] = movementPositions[configuration.North]
+	movementPositions[configuration.SouthEast] = movementPositions[configuration.North]
+	movementPositions[configuration.South] = movementPositions[configuration.North]
+	movementPositions[configuration.SouthWest] = movementPositions[configuration.North]
+	movementPositions[configuration.West] = movementPositions[configuration.North]
+	movementPositions[configuration.NorthWest] = movementPositions[configuration.North]
+
+	p := movementPositions[z.direction][z.step%4]
+
+	op := &ebiten.DrawImageOptions{}
+	op.GeoM.Reset()
+	op.GeoM.Translate(z.X+z.OffsetX, z.Y+z.OffsetY)
+	op.GeoM.Scale(1, 1)
+
+	screen.DrawImage(zombieImage.SubImage(image.Rect(p.x+1, p.y, p.x+resources.ZombieTileSize, p.y+resources.HeroTileSize)).(*ebiten.Image), op)
+}
+
+func init() {
+	img, _, err := image.Decode(bytes.NewReader(resources.Zombie_png))
+	if err != nil {
+		log.Fatal(err)
+	}
+	zombieImage = ebiten.NewImageFromImage(img)
+	walkTicker = time.NewTicker(WalkSpeedMs * time.Millisecond)
+	// go routine that runs on every tick and increases step
+
+}
+
+func NewZombie() *Zombie {
+	hero := &Zombie{
+		step:      0,
+		IsWalking: false,
+	}
+
+	go func() {
+		for {
+			select {
+			case <-walkTicker.C:
+				hero.step++
+				if hero.step > 3 {
+					hero.step = 0
+				}
+			}
+		}
+	}()
+	return hero
+}
+
+func (z *Zombie) Walk() {
+
+	if !z.IsWalking {
+		walkTicker.Reset(WalkSpeedMs * time.Millisecond)
+		z.IsWalking = true
+	}
+
+}
+
+func (z *Zombie) ChangeDirection(d configuration.Direction) {
+	if d != configuration.PreviouslyHeld {
+		z.direction = d
+	}
+}
+
+func (z *Zombie) Stop() {
+	z.step = 2
+	walkTicker.Stop()
+	z.IsWalking = false
+}