Review change: wording

Extensions/PlatformBehavior/Extension.cpp

@@ -648,6 +648,19 @@ void DeclarePlatformBehaviorExtension(gd::PlatformExtension& extension) {
         .UseStandardOperatorParameters("number")
         .MarkAsAdvanced();
 
+    aut.AddScopedAction("FollowCurrentPlatform",
+                     _("Follow the floor"),
+                     _("Move the object to follow the platform it's currently" 
+                     "on if any. This action allows to avoid the 1-frame "
+                     "delay induced by the automatic following."),
+                     _("Move _PARAM0_ to follow the floor"),
+                     _(""),
+                     "CppPlatform/Extensions/platformerobjecticon.png",
+                     "CppPlatform/Extensions/platformerobjecticon.png")
+        .AddParameter("object", _("Object"))
+        .AddParameter("behavior", _("Behavior"), "PlatformerObjectBehavior")
+        .MarkAsAdvanced();
+
     aut.AddCondition("CurrentSpeed",
                      _("Current horizontal speed"),
                      _("Compare the current horizontal speed of the object "

Extensions/PlatformBehavior/JsExtension.cpp

@@ -131,10 +131,14 @@ class PlatformBehaviorJsExtension : public gd::PlatformExtension {
           "getCurrentJumpSpeed");
       autExpressions["CurrentJumpSpeed"].SetFunctionName("getCurrentJumpSpeed");
       autActions["PlatformBehavior::SetCanJump"].SetFunctionName("setCanJump");
-      autActions["PlatformBehavior::PlatformerObjectBehavior::SetCanNotAirJump"].SetFunctionName("setCanNotAirJump");
-      autActions["PlatformBehavior::PlatformerObjectBehavior::AbortJump"].SetFunctionName("abortJump");
-      autConditions["PlatformBehavior::CanJump"].SetFunctionName(
-          "canJump");
+      autActions["PlatformBehavior::PlatformerObjectBehavior::SetCanNotAirJump"]
+          .SetFunctionName("setCanNotAirJump");
+      autActions["PlatformBehavior::PlatformerObjectBehavior::AbortJump"]
+          .SetFunctionName("abortJump");
+      autActions
+          ["PlatformBehavior::PlatformerObjectBehavior::FollowCurrentPlatform"]
+              .SetFunctionName("followCurrentPlatformIfAny");
+      autConditions["PlatformBehavior::CanJump"].SetFunctionName("canJump");
       autActions["PlatformBehavior::SimulateLeftKey"].SetFunctionName(
           "simulateLeftKey");
       autActions["PlatformBehavior::SimulateRightKey"].SetFunctionName(

Extensions/PlatformBehavior/platformerobjectruntimebehavior.ts

@@ -1592,6 +1592,17 @@ namespace gdjs {
         this._currentFallSpeed !== 0
       );
     }
+
+    followCurrentPlatformIfAny(): boolean {
+      let hasMoved = false;
+      if (this.isOnFloor()) {
+        const timeDelta = this.owner.getElapsedTime() / 1000;
+        const hasMovedX = this._onFloor.followCurrentPlatformOnX(timeDelta);
+        const hasMovedY = this._onFloor.followCurrentPlatformOnY(timeDelta);
+        hasMoved = hasMovedX || hasMovedY;
+      }
+      return hasMoved;
+    }
   }
 
   /**
@@ -1666,6 +1677,11 @@ namespace gdjs {
     }
 
     beforeUpdatingObstacles(timeDelta: float) {
+      this.followCurrentPlatformOnY(timeDelta);
+    }
+
+    followCurrentPlatformOnY(timeDelta: float): boolean {
+      let hasMoved = false;
       const object = this._behavior.owner;
       //Stick the object to the floor if its height has changed.
       if (this._oldHeight !== object.getHeight()) {
@@ -1674,6 +1690,7 @@ namespace gdjs {
             object.getHeight() +
             (object.getY() - object.getDrawableY())
         );
+        hasMoved = true;
       }
       // Directly follow the floor movement on the Y axis by moving the character.
       // For the X axis, we follow the floor movement using `_requestedDeltaX`
@@ -1694,14 +1711,18 @@ namespace gdjs {
       // and the platform can go out of the spatial search rectangle
       // even though they are next to each other, which means
       // that the character will fall.
-      const deltaY = this._floorPlatform!.owner.getY() - this._floorLastY;
+      const floorY = this._floorPlatform!.owner.getY();
+      const deltaY = floorY - this._floorLastY;
       if (
         deltaY !== 0 &&
         Math.abs(deltaY) <=
           Math.abs(this._behavior._maxFallingSpeed * timeDelta)
       ) {
         object.setY(object.getY() + deltaY);
+        this._floorLastY = floorY;
+        hasMoved = true;
       }
+      return hasMoved;
     }
 
     checkTransitionBeforeX() {
@@ -1739,11 +1760,29 @@ namespace gdjs {
     beforeMovingX() {
       const behavior = this._behavior;
       // Shift the object according to the floor movement.
-      behavior._requestedDeltaX +=
-        this._floorPlatform!.owner.getX() - this._floorLastX;
+      const floorX = this._floorPlatform!.owner.getX();
+      const deltaX = floorX - this._floorLastX;
+      behavior._requestedDeltaX += deltaX;
+      this._floorLastX = floorX;
       // See `beforeUpdatingObstacles` for the logic for the Y axis.
     }
 
+    followCurrentPlatformOnX(timeDelta: float): boolean {
+      let hasMoved = false;
+      const object = this._behavior.owner;
+
+      // Shift the object according to the floor movement.
+      const floorX = this._floorPlatform!.owner.getX();
+      const deltaX = floorX - this._floorLastX;
+      if (deltaX !== 0) {
+        console.log(deltaX);
+        object.setX(object.getX() + deltaX);
+        this._floorLastX = floorX;
+        hasMoved = true;
+      }
+      return hasMoved;
+    }
+
     checkTransitionBeforeY(timeDelta: float) {
       const behavior = this._behavior;
       // Go on a ladder

Extensions/PlatformBehavior/tests/FlatFloorPlatformer.spec.js

@@ -694,7 +694,7 @@ describe('gdjs.PlatformerObjectRuntimeBehavior', function () {
       expect(object.getBehavior('auto1').isFalling()).to.be(false);
       expect(object.getBehavior('auto1').isOnFloor()).to.be(true);
       expect(object.getY()).to.be.within(140.6297999, 140.6298001);
-      // TODO Remove the 1-frame delay
+      // The floor following has a 1-frame delay.
       expect(object.getX()).to.be(5);
       runtimeScene.renderAndStep(1000 / 60);
       expect(object.getX()).to.be(6);

Extensions/PlatformBehavior/tests/MovingPlatformPlatformer.spec.js

@@ -68,7 +68,7 @@ describe('gdjs.PlatformerObjectRuntimeBehavior', function () {
       runtimeScene.renderAndStepWithEventsFunction(1000 / 60, () => {
         platform.setX(platform.getX() + 0.12);
       });
-      // TODO Remove the 1-frame delay
+      // The floor following has a 1-frame delay.
       expect(object.getX()).to.be(0.24);
       runtimeScene.renderAndStep(1000 / 60);
       expect(object.getX()).to.be(0.36);
@@ -258,13 +258,13 @@ describe('gdjs.PlatformerObjectRuntimeBehavior', function () {
               // The object follow the platform
               // The rounding error is probably due to a separate call.
               // TODO Try to make it exact or find why
-              // TODO Remove the 1-frame delay
+              // The floor following has a 1-frame delay.
               expect(object.getY()).to.be.within(
                 previousPlatformY - object.getHeight() - epsilon,
                 previousPlatformY - object.getHeight() + epsilon
               );
             }
-            // TODO Remove the 1-frame delay
+            // The floor following has a 1-frame delay.
             expect(object.getX()).to.be(0 + 4 * deltaX);
             runtimeScene.renderAndStep(1000 / 60);
             expect(object.getX()).to.be(0 + 5 * deltaX);
@@ -400,13 +400,13 @@ describe('gdjs.PlatformerObjectRuntimeBehavior', function () {
                 expect(object.getBehavior('auto1').isFalling()).to.be(false);
                 expect(object.getBehavior('auto1').isMoving()).to.be(false);
                 // The object must not be inside the platform or it gets stuck
-                // TODO Remove the 1-frame delay
+                // The floor following has a 1-frame delay.
                 expect(object.getY()).to.be.within(
                   previousPlatformY - object.getHeight() - epsilon,
                   previousPlatformY - object.getHeight() + epsilon
                 );
               }
-              // TODO Remove the 1-frame delay
+              // The floor following has a 1-frame delay.
               expect(object.getX()).to.be(0 + 4 * deltaX);
               runtimeScene.renderAndStep(1000 / 60);
               expect(object.getX()).to.be(0 + 5 * deltaX);