From 0a0ceb8f2846c13c16839caa38a1ab849fb871f1 Mon Sep 17 00:00:00 2001
From: Fabien Benetou <fabien-services@benetou.fr>
Date: Mon, 3 Jun 2024 08:47:56 +0200
Subject: [PATCH] throw-on-drop partial examples (working but does not take
 time into account)

---
 index.html | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/index.html b/index.html
index 3ee32c0..b2d1ef8 100644
--- a/index.html
+++ b/index.html
@@ -115,6 +115,41 @@ function showOnlyThisGame(name){
 }
 
 //___________________________________________________________________________________________________________________________________
+AFRAME.registerComponent('throw-on-drop', {
+  init: function(){
+	let generatorName = this.attrName
+	let el = this.el
+
+        AFRAME.scenes[0].setAttribute("physics", "debug:true")
+        el.setAttribute("onpicked", 'window.pfp = e.detail.element.getAttribute("position").clone(); e.detail.element.removeAttribute("dynamic-body")')
+		// could also start an interval instead
+        el.setAttribute("onreleased", 'toss( e.detail.element )')
+  }
+})
+
+function toss(el, forcedvec){
+	// time as force multiplier, i.e .1m/s vs .1m/10s
+		// need to have another variable storing the time when window.pfp changed
+        //AFRAME.scenes[0].setAttribute("physics", "debug:true")
+        el.setAttribute("dynamic-body", "")
+	//el.body.applyImpulse( forcedvec, new CANNON.Vec3().copy(el.getAttribute('position')) )
+	//el.body.applyForce( forcedvec, new CANNON.Vec3().copy(el.getAttribute('position')) )
+	// tested via toss( document.querySelector("[throw-on-drop]"), new THREE.Vector3(0,1,-1) )
+	let pos = new THREE.Vector3().copy( el.getAttribute('position') ) 
+	pos.sub( window.pfp )
+	let vec = new CANNON.Vec3().copy( pos )
+	console.log("sub", vec ) // probably have to be normalized
+	//el.body.applyForce( vec, new CANNON.Vec3().copy(el.getAttribute('position')) )
+	el.body.applyImpulse( vec, new CANNON.Vec3().copy(el.getAttribute('position')) )
+	// cf https://schteppe.github.io/cannon.js/docs/classes/Body.html#method_applyImpulse
+		// could try alternatives, e.g applyForce () 
+	// kind of works... but no notion of power inherited from speed
+		// also the direction is from start from finish, which is not what others expect
+			// except if shown, e.g with helper arrow
+			// could clone and preview movement at interval
+		// does not move if we pick and release in place
+}
+
 /*
  physics https://github.com/c-frame/aframe-physics-system and setup docs https://github.com/c-frame/aframe-physics-system/blob/master/CannonDriver.md#installation
     should append to head script with src="https://cdn.jsdelivr.net/gh/c-frame/aframe-physics-system@v4.2.2/dist/aframe-physics-system.min.js"
@@ -1043,6 +1078,15 @@ S1111
 	  <!-- bug if #box missing, so hiding for now -->
 	  <!-- bug in start-on-press after XR init, as mentioned there -->
 
+	  <!-- testing on physics to toss/object objects -->
+	  <!-- does not work somehow at that position but -.5! -->
+	  <!--
+      <a-sphere target throw-on-drop radius=".05" position="0 1.5 -.2" color="orange"></a-sphere>
+      <a-troika-text throw-on-drop value="movable" target position="0 1.30 -.5" scale="0.1 0.1 0.1"></a-troika-text>
+
+      <a-plane position="0 1.1 -.5" rotation="-90 0 0" static-body></a-plane>
+	-->
+
     </a-scene>
   </body>
 </script>