[V14] Emanation AutoSizing (#1686)

* Added so that emanation templates auto size their base to any token at the spot its placed

* Correct option useage

* Also snap emanations when done from scene controls

---------

Co-authored-by: Carlos Fernandez <cfern1990@gmail.com>

module/canvas/placeables/regionLayer.mjs

@@ -43,6 +43,53 @@ export default class DhRegionLayer extends foundry.canvas.layers.RegionLayer {
         const hole = ui.controls.controls[this.options.name].tools.hole?.active ?? false;
         if (game.activeTool === 'inFront') return { type: 'cone', x: 0, y: 0, radius: 0, angle: 180, hole };
 
-        return super._createDragShapeData(event);
+        const shape = super._createDragShapeData(event);
+        const token = shape?.type === 'emanation' && shape.base?.type === 'token' ? this.#findTokenInBounds(event.interactionData.origin) : null;
+        if (token) {
+            shape.base.width = token.width;
+            shape.base.height = token.height;
+            event.interactionData.origin = token.getCenterPoint();
+        }
+        return shape;
+    }
+
+    async placeRegion(data, options = {}) {
+        const preConfirm = ({ _event, document, _create, _options }) => {
+            const shape = document.shapes[0];
+            const isEmanation = shape.type === 'emanation';
+            if (isEmanation) {
+                const token = this.#findTokenInBounds(shape.base.origin);
+                if (!token) return options.preConfirm?.() ?? true;
+                const shapeData = shape.toObject();
+                document.updateSource({
+                    shapes: [
+                        {
+                            ...shapeData,
+                            base: {
+                                ...shapeData.base,
+                                height: token.height,
+                                width: token.width,
+                                x: token.x,
+                                y: token.y
+                            }
+                        }
+                    ]
+                });
+            }
+
+            return options?.preConfirm?.() ?? true;
+        };
+
+        super.placeRegion(data, { ...options, preConfirm });
+    }
+
+    /** Searches for token at origin point, returning null if there are no tokens or multiple overlapping tokens */
+    #findTokenInBounds(origin) {
+        const { x, y } = origin;
+        const gridSize = canvas.grid.size;
+        const inBounds = canvas.scene.tokens.filter(t => {
+            return x.between(t.x, t.x + t.width * gridSize) && y.between(t.y, t.y + t.height * gridSize);
+        });
+        return inBounds.length === 1 ? inBounds[0] : null;
     }
 }