merge from master

1 files changed, 15 insertions, 0 deletions

diff --git a/src/Utils.ts b/src/Utils.ts
index 65eb3cffd..4fac53c7d 100644
--- a/src/Utils.ts
+++ b/src/Utils.ts
@@ -235,6 +235,21 @@ export function timenow() {
     return now.toLocaleDateString() + ' ' + h + ':' + m + ' ' + ampm;
 }
 
+export function aggregateBounds(boundsList: { x: number, y: number, width: number, height: number }[]) {
+    return boundsList.reduce((bounds, b) => {
+        var [sptX, sptY] = [b.x, b.y];
+        let [bptX, bptY] = [sptX + b.width, sptY + b.height];
+        return {
+            x: Math.min(sptX, bounds.x), y: Math.min(sptY, bounds.y),
+            r: Math.max(bptX, bounds.r), b: Math.max(bptY, bounds.b)
+        };
+    }, { x: Number.MAX_VALUE, y: Number.MAX_VALUE, r: -Number.MAX_VALUE, b: -Number.MAX_VALUE });
+}
+export function intersectRect(r1: { left: number, top: number, width: number, height: number },
+    r2: { left: number, top: number, width: number, height: number }) {
+    return !(r2.left > r1.left + r1.width || r2.left + r2.width < r1.left || r2.top > r1.top + r1.height || r2.top + r2.height < r1.top);
+}
+
 export function percent2frac(percent: string) {
     return Number(percent.substr(0, percent.length - 1)) / 100;
 }