up3

server/block/cactus.go

@@ -0,0 +1,121 @@
+package block
+
+import (
+	"github.com/df-mc/dragonfly/server/block/cube"
+	"github.com/df-mc/dragonfly/server/block/model"
+	"github.com/df-mc/dragonfly/server/item"
+	"github.com/df-mc/dragonfly/server/world"
+	"github.com/go-gl/mathgl/mgl64"
+	"math/rand/v2"
+)
+
+// Cactus is a plant block that generates naturally in dry areas and causes damage.
+type Cactus struct {
+	transparent
+
+	// Age is the growth state of cactus. Values range from 0 to 15.
+	Age int
+}
+
+// UseOnBlock handles making sure the neighbouring blocks are air.
+func (c Cactus) UseOnBlock(pos cube.Pos, face cube.Face, _ mgl64.Vec3, tx *world.Tx, user item.User, ctx *item.UseContext) (used bool) {
+	pos, _, used = firstReplaceable(tx, pos, face, c)
+	if !used || !c.canGrowHere(pos, tx, true) {
+		return false
+	}
+
+	place(tx, pos, c, user, ctx)
+	return placed(ctx)
+}
+
+// NeighbourUpdateTick ...
+func (c Cactus) NeighbourUpdateTick(pos, _ cube.Pos, tx *world.Tx) {
+	if !c.canGrowHere(pos, tx, true) {
+		breakBlock(c, pos, tx)
+	}
+}
+
+// RandomTick ...
+func (c Cactus) RandomTick(pos cube.Pos, tx *world.Tx, _ *rand.Rand) {
+	if c.Age < 15 {
+		c.Age++
+	} else if c.Age == 15 {
+		c.Age = 0
+		if c.canGrowHere(pos.Side(cube.FaceDown), tx, false) {
+			for y := 1; y < 3; y++ {
+				if _, ok := tx.Block(pos.Add(cube.Pos{0, y})).(Air); ok {
+					tx.SetBlock(pos.Add(cube.Pos{0, y}), Cactus{Age: 0}, nil)
+					break
+				} else if _, ok := tx.Block(pos.Add(cube.Pos{0, y})).(Cactus); !ok {
+					break
+				}
+			}
+		}
+	}
+	tx.SetBlock(pos, c, nil)
+}
+
+// canGrowHere implements logic to check if cactus can live/grow here.
+func (c Cactus) canGrowHere(pos cube.Pos, tx *world.Tx, recursive bool) bool {
+	for _, face := range cube.HorizontalFaces() {
+		if _, ok := tx.Block(pos.Side(face)).(Air); !ok {
+			return false
+		}
+	}
+	if _, ok := tx.Block(pos.Side(cube.FaceDown)).(Cactus); ok && recursive {
+		return c.canGrowHere(pos.Side(cube.FaceDown), tx, recursive)
+	}
+	return supportsVegetation(c, tx.Block(pos.Sub(cube.Pos{0, 1})))
+}
+
+// EntityInside ...
+func (c Cactus) EntityInside(_ cube.Pos, _ *world.Tx, e world.Entity) {
+	if l, ok := e.(livingEntity); ok {
+		l.Hurt(0.5, DamageSource{Block: c})
+	}
+}
+
+// BreakInfo ...
+func (c Cactus) BreakInfo() BreakInfo {
+	return newBreakInfo(0.4, alwaysHarvestable, nothingEffective, oneOf(c))
+}
+
+// CompostChance ...
+func (Cactus) CompostChance() float64 {
+	return 0.5
+}
+
+// EncodeItem ...
+func (c Cactus) EncodeItem() (name string, meta int16) {
+	return "minecraft:cactus", 0
+}
+
+// EncodeBlock ...
+func (c Cactus) EncodeBlock() (name string, properties map[string]any) {
+	return "minecraft:cactus", map[string]any{"age": int32(c.Age)}
+}
+
+// Model ...
+func (c Cactus) Model() world.BlockModel {
+	return model.Cactus{}
+}
+
+// allCactus returns all possible states of a cactus block.
+func allCactus() (b []world.Block) {
+	for i := 0; i < 16; i++ {
+		b = append(b, Cactus{Age: i})
+	}
+	return
+}
+
+// DamageSource is passed as world.DamageSource for damage caused by a block,
+// such as a cactus or a falling anvil.
+type DamageSource struct {
+	// Block is the block that caused the damage.
+	Block world.Block
+}
+
+func (DamageSource) ReducedByResistance() bool { return true }
+func (DamageSource) ReducedByArmour() bool     { return true }
+func (DamageSource) Fire() bool                { return false }
+func (DamageSource) IgnoreTotem() bool         { return false }