Added zoom functionality

src/client/java/wtf/hak/survivalfabric/SurvivalFabricClient.java

@@ -5,6 +5,7 @@ import wtf.hak.survivalfabric.config.client.ClientConfigManager;
 import wtf.hak.survivalfabric.features.AngleViewer;
 import wtf.hak.survivalfabric.features.RemoveDarknessEffect;
 import wtf.hak.survivalfabric.features.SFKeyBindings;
+import wtf.hak.survivalfabric.features.Zoom;
 
 public class SurvivalFabricClient implements ClientModInitializer {
 
@@ -18,6 +19,6 @@ public class SurvivalFabricClient implements ClientModInitializer {
         AngleViewer.register();
         RemoveDarknessEffect.register();
         SFKeyBindings.register();
-
+        Zoom.register();
     }
 }

src/client/java/wtf/hak/survivalfabric/features/Zoom.java

@@ -0,0 +1,52 @@
+package wtf.hak.survivalfabric.features;
+
+import net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientTickEvents;
+import net.fabricmc.fabric.api.client.keybinding.v1.KeyBindingHelper;
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.client.option.KeyBinding;
+import net.minecraft.client.util.InputUtil;
+import net.minecraft.text.Text;
+import org.lwjgl.glfw.GLFW;
+import wtf.hak.survivalfabric.utils.MathUtils;
+
+public class Zoom {
+
+    private static final KeyBinding ZOOM_BIND = KeyBindingHelper.registerKeyBinding(new KeyBinding("key.survivalfabric.zoom", InputUtil.Type.KEYSYM, GLFW.GLFW_KEY_C, "category.survivalfabric.survivalfabric"));
+    private static final float INITIAL_ZOOM = 20f;
+
+    private static boolean SHOULD_ZOOM = false;
+    private static float ZOOM_STEP_VALUE = 2.5f;
+    private static int ZOOM_STEP = 0;
+
+    public static void register() {
+        ClientTickEvents.END_CLIENT_TICK.register(client -> {
+            if(ZOOM_BIND.isPressed())
+                SHOULD_ZOOM = true;
+            else {
+                SHOULD_ZOOM = false;
+                ZOOM_STEP = 0;
+            }
+        });
+    }
+
+    public static boolean isZooming() {
+        return SHOULD_ZOOM;
+    }
+
+    public static float getZoomFov() {
+        return INITIAL_ZOOM - -ZOOM_STEP * ZOOM_STEP_VALUE;
+    }
+
+    public static void modifyStep(int step) {
+        ZOOM_STEP += step;
+
+        // Clamp the zoom level so the FOV stays within [1, 110]
+        float zoomFov = getZoomFov();
+        if (zoomFov < 1) {
+            ZOOM_STEP = Math.round((1 - INITIAL_ZOOM) / ZOOM_STEP_VALUE)+1;
+        } else if (zoomFov > 110) {
+            ZOOM_STEP = Math.round((110 - INITIAL_ZOOM) / ZOOM_STEP_VALUE);
+        }
+        MinecraftClient.getInstance().player.sendMessage(Text.literal(ZOOM_STEP + ""), true);
+    }
+}

src/client/java/wtf/hak/survivalfabric/mixin/client/GameRendererMixin.java

@@ -0,0 +1,21 @@
+package wtf.hak.survivalfabric.mixin.client;
+
+import com.llamalad7.mixinextras.injector.ModifyReturnValue;
+import com.llamalad7.mixinextras.sugar.Local;
+import net.minecraft.client.render.GameRenderer;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import wtf.hak.survivalfabric.features.Zoom;
+
+@Mixin(GameRenderer.class)
+public abstract class GameRendererMixin {
+
+    /**
+     * Modify Zoom FOV
+     */
+    @ModifyReturnValue(method = "getFov", at = @At("RETURN"))
+    private float modifyFovWithZoom(float fov, @Local(argsOnly = true) float tickDelta) {
+        return Zoom.isZooming() ? Zoom.getZoomFov() : fov;
+    }
+
+}

src/client/java/wtf/hak/survivalfabric/mixin/client/MouseMixin.java

@@ -0,0 +1,31 @@
+package wtf.hak.survivalfabric.mixin.client;
+
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.client.Mouse;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+import wtf.hak.survivalfabric.features.Zoom;
+
+@Mixin(Mouse.class)
+public class MouseMixin {
+
+    /**
+     * Scrolling listener for zooming
+     */
+    @Inject(method = "onMouseScroll", at = @At("HEAD"), cancellable = true)
+    private void onMouseScroll(long window, double horizontal, double vertical, CallbackInfo ci) {
+        if(Zoom.isZooming()) {
+            if(MinecraftClient.getInstance().player != null) {
+                if(vertical>0)
+                    Zoom.modifyStep(-1);
+                else
+                    Zoom.modifyStep(1);
+            }
+            ci.cancel();
+        }
+    }
+
+
+}

src/client/resources/survivalfabric.client.mixins.json

@@ -5,7 +5,9 @@
   "client": [
     "BackgroundRendererMixin",
     "BlockEntityRendererMixin",
-    "EntityMixin"
+    "EntityMixin",
+    "GameRendererMixin",
+    "MouseMixin"
   ],
   "injectors": {
     "defaultRequire": 1

src/main/java/wtf/hak/survivalfabric/utils/MathUtils.java

@@ -3,6 +3,18 @@ package wtf.hak.survivalfabric.utils;
 public class MathUtils {
 
 
+    public static double clamp(double value, double min, double max) {
+        return Math.max(min, Math.min(max, value));
+    }
+
+    public static float clamp(float value, float min, float max) {
+        return Math.max(min, Math.min(max, value));
+    }
+
+    public static int clamp(int value, int min, int max) {
+        return Math.max(min, Math.min(max, value));
+    }
+
     public static boolean hasSupportedOperator(String msg) {
         return msg.contains("+") || msg.contains("-") || msg.contains("*") || msg.contains("/");
     }

src/main/resources/assets/survivalfabric/lang/en_us.json

@@ -17,5 +17,6 @@
   "key.survivalfabric.angle14": "204.98 / -41.68",
   "key.survivalfabric.angle15": "244.97 / -41.71",
   "category.survivalfabric.survivalfabric": "Survival Fabric",
-  "key.survivalfabric.camera": "/camera"
+  "key.survivalfabric.camera": "/camera",
+  "key.survivalfabric.zoom": "Zoom"
 }