use top location on FancyHolograms

Author: HSGamer

spigot/fancyholograms/src/main/java/me/hsgamer/unihologram/spigot/fancyholograms/hologram/FHHologram.java

@@ -14,13 +14,15 @@
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Objects;
 import java.util.function.Consumer;
 import java.util.stream.Collectors;
 
 /**
  * The hologram for FancyHolograms
  */
 public class FHHologram implements me.hsgamer.unihologram.common.api.Hologram<Location>, PlayerVisibility {
+    private static final double LINE_HEIGHT = 0.25;
     private final Hologram hologram;
 
     /**
@@ -44,6 +46,32 @@ public FHHologram(Hologram hologram) {
         this.hologram = hologram;
     }
 
+    private static Location getTopLocation(Location location, float scale, int lineCount) {
+        Location newLocation = Objects.requireNonNull(location).clone();
+        newLocation.setY(newLocation.getY() + LINE_HEIGHT * scale * lineCount);
+        return newLocation;
+    }
+
+    private static Location getBottomLocation(Location location, float scale, int lineCount) {
+        Location newLocation = Objects.requireNonNull(location).clone();
+        newLocation.setY(newLocation.getY() - LINE_HEIGHT * scale * lineCount);
+        return newLocation;
+    }
+
+    private Location getTopLocation() {
+        return getTopLocation(hologram.getData().getLocation(), hologram.getData().getScale(), hologram.getData().getText().size());
+    }
+
+    private void setTopLocation(Location location) {
+        hologram.getData().setLocation(getBottomLocation(location, hologram.getData().getScale(), hologram.getData().getText().size()));
+    }
+
+    private void updateTopLocation(int lineCount) {
+        Location topLocation = getTopLocation(hologram.getData().getLocation(), hologram.getData().getScale(), hologram.getData().getText().size());
+        Location bottomLocation = getBottomLocation(topLocation, hologram.getData().getScale(), lineCount);
+        hologram.getData().setLocation(bottomLocation);
+    }
+
     private void checkHologramInitialized() {
         Preconditions.checkArgument(isInitialized(), "Hologram is not initialized");
     }
@@ -70,6 +98,7 @@ private void editLine(Consumer<List<HologramLine>> consumer) {
         checkHologramInitialized();
         List<HologramLine> lines = new ArrayList<>(getLines());
         consumer.accept(lines);
+        updateTopLocation(lines.size());
         setLines(lines);
     }
 
@@ -115,13 +144,13 @@ public boolean isInitialized() {
     @Override
     public Location getLocation() {
         checkHologramInitialized();
-        return hologram.getData().getLocation();
+        return getTopLocation();
     }
 
     @Override
     public void setLocation(Location location) {
         checkHologramInitialized();
-        hologram.getData().setLocation(location);
+        setTopLocation(location);
         updateHologram();
     }