Zoom curve

src/main/java/org/saturnclient/mod/mods/ZoomMod.java

@@ -1,30 +1,28 @@
 package org.saturnclient.mod.mods;
 
+import java.util.function.Function;
+
 import org.saturnclient.common.provider.GLFWProvider;
 import org.saturnclient.config.property.BoolProperty;
 import org.saturnclient.config.property.FloatProperty;
+import org.saturnclient.config.property.IntProperty;
 import org.saturnclient.config.property.KeybindingProperty;
 import org.saturnclient.config.property.Property;
+import org.saturnclient.config.property.SelectProperty;
 import org.saturnclient.mod.Mod;
 import org.saturnclient.mod.ModSpec;
+import org.saturnclient.ui.anim.Animation;
 
-/**
- * ZoomMod multiplies the camera's field-of-view to create an
- * optical-zoom effect.
- *
- * The FOV override is applied inside a mixin that polls
- * {@link #shouldZoom()} and {@link #getZoomLevel()} each frame.
- * No FeatureProvider is needed — there is no per-tick engine query.
- */
 public class ZoomMod extends Mod {
 
     private static final BoolProperty enabled = Property.bool(false);
     private static final BoolProperty toggle = Property.bool(false);
     public static final KeybindingProperty zoomKey = Property.keybinding(GLFWProvider.GLFW_KEY_C);
     public static final FloatProperty zoomLevel = Property.floatProp(3.0f);
-
-    /** Whether zoom is currently active (read by the FOV mixin). */
-    public static boolean isZooming = false;
+    public static final IntProperty zoomInDuration = Property.integer(700);
+    public static final IntProperty zoomOutDuration = Property.integer(300);
+    public static final SelectProperty curve = Property.select(1, "Ease In Out Cubic", "Ease Out Cubic",
+            "Ease In Out Back");
 
     public ZoomMod() {
         super(
@@ -35,15 +33,31 @@ public class ZoomMod extends Mod {
                 enabled.named("Enabled"),
                 toggle.named("Toggle zoom"),
                 zoomKey.named("Zoom Keybinding"),
-                zoomLevel.named("Zoom Level"));
+                zoomLevel.named("Zoom Level"),
+                zoomInDuration.named("Zoom In Duration"),
+                zoomOutDuration.named("Zoom Out Duration"),
+                curve.named("Curve"));
     }
 
+    // ---------------------------------------------------------------
+    // Mod fields
+    // ---------------------------------------------------------------
+
+    /** Zooming state */
+    public static boolean isZooming = false;
+
+    /** Animation state */
+    private static float progress = 0f; // 0 → 1
+    private static long lastTime = System.currentTimeMillis();
+    private static boolean lastTarget = false; // remember previous zoom state
+
     // ---------------------------------------------------------------
     // Mod contract
     // ---------------------------------------------------------------
 
     @Override
     public void tick() {
+        // Update target zoom state
         if (toggle.value) {
             if (zoomKey.wasKeyPressed()) {
                 isZooming = !isZooming;
@@ -71,11 +85,41 @@ public class ZoomMod extends Mod {
 
     /** Returns {@code true} when the FOV override should be applied. */
     public static boolean shouldZoom() {
-        return enabled.value && isZooming;
+        return enabled.value && (isZooming || progress > 0f);
+    }
+
+    public static int getZoomDuration() {
+        if (isZooming) {
+            return zoomInDuration.value;
+        } else {
+            return zoomOutDuration.value;
+        }
     }
 
     /** Returns the zoom divisor (e.g. 3.0 → one-third of normal FOV). */
     public static float getZoomLevel() {
-        return zoomLevel.value;
+        // Detect target change and reset timer
+        if (isZooming != lastTarget) {
+            lastTime = System.currentTimeMillis();
+            lastTarget = isZooming;
+        }
+
+        long now = System.currentTimeMillis();
+        float delta = (now - lastTime) / (float) getZoomDuration();
+        lastTime = now;
+
+        // Animate progress toward target
+        if (isZooming) {
+            progress = Math.min(1f, progress + delta);
+        } else {
+            progress = Math.max(0f, progress - delta);
+        }
+
+        // Apply curve
+        Function<Double, Double> curveFn = Animation.getCurve(curve.value);
+        double curved = curveFn.apply((double) progress);
+
+        // Map to zoom level
+        return 1.0f + (float) curved * (zoomLevel.value - 1f);
     }
-}
+}