integrated raycasting into "relation TO object" primitive

HISTORY.md

@@ -3,6 +3,7 @@
 ## in development:
 
 * **New Features:**
+    * raycasting: new "ray length" option in the "relation TO object" primitive
     * hyperdyadic MIN and MAX primitives reachable via "relabel"
     * hyperdyadic less / great than or equals primitives reachable via "relabel"
     * new SIGN function in arithmetic dropdown
@@ -20,6 +21,7 @@
 
 ### 2020-12-04
 * threads: refactored raycasting
+* integrated raycasting into "relation TO object" primitive
 
 ### 2020-12-03
 * threads: raycasting edge detection, under construction

snap.html

@@ -8,9 +8,9 @@
         <script src="src/morphic.js?version=2020-12-02"></script>
         <script src="src/symbols.js?version=2020-10-07"></script>
         <script src="src/widgets.js?version=2020-10-06"></script>
-        <script src="src/blocks.js?version=2020-12-02"></script>
+        <script src="src/blocks.js?version=2020-12-04"></script>
         <script src="src/threads.js?version=2020-12-04"></script>
-        <script src="src/objects.js?version=2020-12-03"></script>
+        <script src="src/objects.js?version=2020-12-04"></script>
         <script src="src/gui.js?version=2020-12-01"></script>
         <script src="src/paint.js?version=2020-05-17"></script>
         <script src="src/lists.js?version=2020-12-01"></script>

src/blocks.js

@@ -158,7 +158,7 @@ CustomCommandBlockMorph, SymbolMorph, ToggleButtonMorph, DialMorph*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.blocks = '2020-December-02';
+modules.blocks = '2020-December-04';
 
 var SyntaxElementMorph;
 var BlockMorph;
@@ -473,7 +473,8 @@ SyntaxElementMorph.prototype.labelParts = {
         tags: 'read-only static',
         menu: {
             'distance' : ['distance'],
-            'direction' : ['direction']
+            'direction' : ['direction'],
+            'ray length' : ['ray length']
         }
     },
     '%loc': {

src/objects.js

@@ -84,7 +84,7 @@ BlockEditorMorph, BlockDialogMorph, PrototypeHatBlockMorph,  BooleanSlotMorph,
 localize, TableMorph, TableFrameMorph, normalizeCanvas, VectorPaintEditorMorph,
 AlignmentMorph, Process, WorldMap, copyCanvas, useBlurredShadows*/
 
-modules.objects = '2020-December-03';
+modules.objects = '2020-December-04';
 
 var SpriteMorph;
 var StageMorph;
@@ -979,13 +979,6 @@ SpriteMorph.prototype.initBlocks = function () {
             spec: '%rel to %dst',
             defaults: [['distance'], ['mouse-pointer']]
         },
-        reportDistanceFacing: { // experimental, under construction
-            only: SpriteMorph,
-            type: 'reporter',
-            category: 'sensing',
-            spec: 'distance facing %cln',
-            defaults: [['myself']]
-        },
         doResetTimer: {
             type: 'command',
             category: 'sensing',
@@ -2547,8 +2540,6 @@ SpriteMorph.prototype.blockTemplates = function (category) {
             blocks.push(block('reportThreadCount'));
             blocks.push(block('reportStackSize'));
             blocks.push(block('reportFrameCount'));
-            blocks.push('-');
-            blocks.push(block('reportDistanceFacing'));
         }
 
 	/////////////////////////////////

src/threads.js

@@ -4748,6 +4748,9 @@ Process.prototype.reportRelationTo = function (relation, name) {
  	if (rel === 'distance') {
   		return this.reportDistanceTo(name);
   	}
+    if (rel === 'ray length') {
+    	return this.reportRayLengthTo(name);
+    }
     if (rel === 'direction') {
     	return this.reportDirectionTo(name);
     }
@@ -4790,15 +4793,10 @@ Process.prototype.reportDistanceTo = function (name) {
     return 0;
 };
 
-Process.prototype.reportDistanceFacing = function (name) {
-    // raycasting edge detection, highly experimental - under construction
-
-    if (this.enableHyperOps) {
-        if (name instanceof List) {
-            return name.map(each => this.reportDistanceFacing(each));
-        }
-    }
-
+Process.prototype.reportRayLengthTo = function (name) {
+    // raycasting edge detection - answer the distance between the asking
+    // sprite's rotation center to the target sprite's outer edge (the first
+    // opaque pixel) in the asking sprite's current direction
     var thisObj = this.blockReceiver(),
         thatObj,
         stage,
@@ -4856,7 +4854,7 @@ Process.prototype.reportDistanceFacing = function (name) {
     point = rc;
     stage = thisObj.parentThatIsA(StageMorph);
     thatObj = this.getOtherObject(name, thisObj, stage);
-    if (!thatObj) {return -1; }
+    if (!(thatObj instanceof SpriteMorph)) {return -1; }
 
     // determine intersections with the target's bounding box
     dir = thisObj.heading;