Basic implementations

js/geometry/GeometryPoint.js

@@ -1,6 +1,6 @@
 export default class GeometryPoint
 {
-    constructor(x, y)
+    constructor(x = 0, y = 0)
     {
         this.x = x;
         this.y = y;

js/geometry/GeometryRect.js

@@ -1,6 +1,7 @@
 import GeometryPoint from "./GeometryPoint.js";
 import GeometryStroke from "./GeometryStroke.js";
 import GeometryPointCollection from "./GeometryPointCollection.js";
+import GeometryLine from "./GeometryLine.js";
 
 export default class GeometryRect
 {
@@ -31,6 +32,11 @@ export default class GeometryRect
         return containsHorizontally && containsVertically;
     }
 
+    hasIntersectionWithRect(rect)
+    {
+        return this.getBorderIntersectonsWithRect(rect).getLength() > 0;
+    }
+
     getBorderTop()
     {
         return new GeometryStroke(
@@ -92,6 +98,12 @@ export default class GeometryRect
         return intersections;
     }
 
+    /**
+     * Returns the intersection points between the border lines and the given stroke.
+     *
+     * @param stroke
+     * @returns {GeometryPointCollection}
+     */
     getBorderIntersectionsWithStroke(stroke)
     {
         let borders = [
@@ -172,6 +184,12 @@ export default class GeometryRect
      */
     getRectIntersection(rect)
     {
+        let distanceToOrigin = this.getCenter().getDistanceToPoint(rect.getCenter());
+
+        if (distanceToOrigin > this.getDiagonal() * 0.5 + rect.getDiagonal() * 0.5) {
+            return null;
+        }
+
         let intersectionPoints = new GeometryPointCollection();
 
         this.getRectanglePoints().forEach(
@@ -211,6 +229,22 @@ export default class GeometryRect
         return null;
     }
 
+    getCenter()
+    {
+        return new GeometryPoint(
+            this.position.x + this.width * 0.5,
+            this.position.y + this.height * 0.5
+        );
+    }
+
+    getDiagonal()
+    {
+        return new GeometryStroke(
+            this.position,
+            new GeometryPoint(this.position.x + this.width, this.position.y + this.height)
+        );
+    }
+
     /**
      * Visualizes the rect.
      *

js/geometry/GeometryStroke.js

@@ -21,6 +21,11 @@ export default class GeometryStroke extends GeometryLine
         return new GeometryLine(this.pointA, this.pointB);
     }
 
+    getLength()
+    {
+        return this.pointA.getDistanceToPoint(this.pointB);
+    }
+
     getIntersectionWithStroke(stroke)
     {
         let intersection = super.getIntersectionWithLine(stroke);