refactored mouseX / mouseY to use generic coordinate conversion

HISTORY.md

@@ -22,6 +22,7 @@
 * threads, blocks: added SIGN function to monadic dropdown
 * Catalan translation update, thanks, Joan!
 * Morphic: prevent browser override for ctrl+o gesture
+* objects, threads: refactored mouseX / mouseY to use generic coordinate conversion
 
 ### 2020-12-01
 * threads, objects: added hyperdyadic MIN and MAX primitives reachable via "relabel"

snap.html

@@ -10,7 +10,7 @@
         <script src="src/widgets.js?version=2020-10-06"></script>
         <script src="src/blocks.js?version=2020-12-02"></script>
         <script src="src/threads.js?version=2020-12-02"></script>
-        <script src="src/objects.js?version=2020-12-01"></script>
+        <script src="src/objects.js?version=2020-12-02"></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/objects.js

@@ -84,7 +84,7 @@ BlockEditorMorph, BlockDialogMorph, PrototypeHatBlockMorph,  BooleanSlotMorph,
 localize, TableMorph, TableFrameMorph, normalizeCanvas, VectorPaintEditorMorph,
 AlignmentMorph, Process, WorldMap, copyCanvas, useBlurredShadows*/
 
-modules.objects = '2020-December-01';
+modules.objects = '2020-December-02';
 
 var SpriteMorph;
 var StageMorph;
@@ -9303,6 +9303,11 @@ StageMorph.prototype.getLastAnswer
 StageMorph.prototype.reportThreadCount
     = SpriteMorph.prototype.reportThreadCount;
 
+// StageMorph coordinate conversion
+
+StageMorph.prototype.snapPoint
+    = SpriteMorph.prototype.snapPoint;
+
 // StageMorph dimension getters
 
 StageMorph.prototype.xCenter = function () {

src/threads.js

@@ -5193,30 +5193,22 @@ Process.prototype.reportContextFor = function (context, otherObj) {
 };
 
 Process.prototype.reportMouseX = function () {
-    var stage, world;
+    var world;
     if (this.homeContext.receiver) {
-        stage = this.homeContext.receiver.parentThatIsA(StageMorph);
-        if (stage) {
-            world = stage.world();
-            if (world) {
-                return (world.hand.position().x - stage.center().x)
-                    / stage.scale;
-            }
+        world = this.homeContext.receiver.world();
+        if (world) {
+            return this.homeContext.receiver.snapPoint(world.hand.position()).x;
         }
     }
     return 0;
 };
 
 Process.prototype.reportMouseY = function () {
-    var stage, world;
+    var world;
     if (this.homeContext.receiver) {
-        stage = this.homeContext.receiver.parentThatIsA(StageMorph);
-        if (stage) {
-            world = stage.world();
-            if (world) {
-                return (stage.center().y - world.hand.position().y)
-                    / stage.scale;
-            }
+        world = this.homeContext.receiver.world();
+        if (world) {
+            return this.homeContext.receiver.snapPoint(world.hand.position()).y;
         }
     }
     return 0;