up3

server/item/dye.go

@@ -0,0 +1,37 @@
+package item
+
+import (
+	"github.com/df-mc/dragonfly/server/block/cube"
+	"github.com/df-mc/dragonfly/server/world"
+	"github.com/go-gl/mathgl/mgl64"
+)
+
+// Dye is an item that comes in 16 colours which allows you to colour blocks like concrete and sheep.
+type Dye struct {
+	// Colour is the colour of the dye.
+	Colour Colour
+}
+
+// UseOnBlock implements the colouring behaviour of signs.
+func (d Dye) UseOnBlock(pos cube.Pos, _ cube.Face, _ mgl64.Vec3, tx *world.Tx, user User, ctx *UseContext) bool {
+	if dy, ok := tx.Block(pos).(dyeable); ok {
+		if res, ok := dy.Dye(pos, user.Position(), d.Colour); ok {
+			tx.SetBlock(pos, res, nil)
+			ctx.SubtractFromCount(1)
+			return true
+		}
+	}
+	return false
+}
+
+// dyeable represents a block that may be dyed by clicking it with a dye item.
+type dyeable interface {
+	// Dye uses a dye with the Colour passed on the block. The resulting block is returned. A bool is returned to
+	// indicate if dyeing the block was successful.
+	Dye(pos cube.Pos, userPos mgl64.Vec3, c Colour) (world.Block, bool)
+}
+
+// EncodeItem ...
+func (d Dye) EncodeItem() (name string, meta int16) {
+	return "minecraft:" + d.Colour.String() + "_dye", 0
+}