up3

server/player/dialogue/display.go

@@ -0,0 +1,38 @@
+package dialogue
+
+import (
+	"encoding/json"
+	"github.com/go-gl/mathgl/mgl64"
+)
+
+// DisplaySettings holds optional fields that change the way the dialogue,
+// particularly the entity shown in it, is displayed.
+type DisplaySettings struct {
+	// EntityScale specifies the scale of the entity displayed in the dialogue.
+	EntityScale mgl64.Vec3
+	// EntityOffset specifies the offset of the entity shown in the dialogue.
+	EntityOffset mgl64.Vec3
+	// EntityRotation is the rotation of the entity shown in the dialogue. This
+	// rotation functions a bit differently to the normal entity rotation in
+	// Minecraft: The values are still degrees, but pitch (rot[1]) values are
+	// whole-body pitch instead of head-specific, and rot[2] is whole-body roll.
+	EntityRotation mgl64.Vec3
+}
+
+// MarshalJSON encodes the DisplaySettings to JSON.
+func (d DisplaySettings) MarshalJSON() ([]byte, error) {
+	// Yaw and pitch are swapped in this display.
+	d.EntityRotation[0], d.EntityRotation[1] = d.EntityRotation[1], d.EntityRotation[0]-32
+	m := map[string]any{
+		// Translate needs to be multiplied by -32 to get a rough block
+		// equivalent.
+		"translate": d.EntityOffset.Mul(-32),
+		// Entity is rotated by 32 degrees by default.
+		"rotate": d.EntityRotation,
+		"scale":  [3]float64{1, 1, 1},
+	}
+	if (d.EntityScale != mgl64.Vec3{}) {
+		m["scale"] = d.EntityScale
+	}
+	return json.Marshal(m)
+}