Add files via upload
diff --git a/js/circle-mode.js b/js/circle-mode.js
index ea5f423..d5ecff3 100644
--- a/js/circle-mode.js
+++ b/js/circle-mode.js
@@ -1,9 +1,11 @@
+// *********** HERE STARTS circle-mode.js *************
+
window.addEventListener("load", initCircleMode);
circleMode = false;
function initCircleMode() {
- document.querySelector("#circle-mode").addEventListener('click', function() {
+ document.querySelector("#circle-mode").addEventListener('click', function() {
if(circleMode) {
circleMode = false;
document.querySelector("#circle-mode i").innerText = "trip_origin";
@@ -29,4 +31,22 @@
s.refresh();
}
});
+}
+
+function isInRect (x, y, rect) {
+ if (x < -10000 || x > 10000) return true;
+ if (y < -10000 || y > 10000) return true;
+
+ var ans = true;
+ var c = crossProd (rect[0], rect[1], x, y);
+
+ for(var i=1; i<4; i++) {
+ var temp = crossProd (rect[i], rect[(i+1)%4], x, y);
+ if (c*temp < 0) ans = false;
+ }
+ return ans;
+}
+
+function crossProd(r1, r2, x, y) {
+ return r1[0]*r2[1] + r2[0]*y + x*r1[1] - r1[0]*y - r2[0]*r1[1] - x*r2[1];
}
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