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