Selection fixed, SimpleSelectionModel added

js/SimpleSelectionModel.js

@@ -0,0 +1,44 @@
+export default class SimpleSelectionModel {
+
+    /**
+     * @typedef {{
+     *      primaryInf: number,
+     *      primarySup: number,
+     *      secondaryInf: number,
+     *      secondarySup: number
+     * }} BoundariesInfo
+     * @typedef {numeric} Rectangle
+     * @param {number[]} initialPosition Coordinates of the starting point of selection [primaryAxisValue, secondaryAxisValue].
+     * @param {Rectangle[]} rectangles Rectangles that can be selected by this object.
+     * @param {(rect: Rectangle) => BoundariesInfo} boundariesFunc A function that, given a rectangle, it provides the boundaries of such rectangle.
+     * @param {(rect: Rectangle, selected: bool) => void} selectToggleFunction A function that selects or deselects individual rectangles.
+     */
+    constructor(initialPosition, rectangles, boundariesFunc, selectToggleFunction) {
+        this.initialPosition = initialPosition
+        this.finalPosition = initialPosition
+        this.boundariesFunc = boundariesFunc
+        this.selectToggleFunction = selectToggleFunction
+        this.rectangles = rectangles
+    }
+
+    selectTo(finalPosition) {
+        let primaryInf = Math.min(finalPosition[0], this.initialPosition[0])
+        let primarySup = Math.max(finalPosition[0], this.initialPosition[0])
+        let secondaryInf = Math.min(finalPosition[1], this.initialPosition[1])
+        let secondarySup = Math.max(finalPosition[1], this.initialPosition[1])
+        this.finalPosition = finalPosition
+        this.rectangles.forEach(rect => {
+            let boundaries = this.boundariesFunc(rect)
+            if (
+                Math.max(boundaries.primaryInf, primaryInf) < Math.min(boundaries.primarySup, primarySup)
+                && Math.max(boundaries.secondaryInf, secondaryInf) < Math.min(boundaries.secondarySup, secondarySup)
+            ) {
+                this.selectToggleFunction(rect, true)
+            } else {
+
+                this.selectToggleFunction(rect, false)
+            }
+        })
+    }
+
+}