From a2ed8e2e25cc73916a651d0ce9395130371e0d1c Mon Sep 17 00:00:00 2001
From: Kolan Sh <backbone@backbone.ws>
Date: Fri, 19 Jan 2018 13:45:21 +0300
Subject: [PATCH] In progress...

---
 src/Math.vala   | 7 ++++++-
 src/Series.vala | 4 ++--
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/src/Math.vala b/src/Math.vala
index 25b2544..7083dc7 100644
--- a/src/Math.vala
+++ b/src/Math.vala
@@ -21,13 +21,18 @@ namespace CairoChart {
 			return step;
 		}
 
-		internal bool are_intersect (double a_min, double a_max, double b_min, double b_max) {
+		internal bool coord_cross (double a_min, double a_max, double b_min, double b_max) {
 			if (   a_min < a_max <= b_min < b_max
 			    || b_min < b_max <= a_min < a_max)
 				return false;
 			return true;
 		}
 
+		internal bool rect_cross (Cairo.Rectangle r1, Cairo.Rectangle r2) {
+			return    coord_cross(r1.x, r1.x + r1.width, r2.x, r2.x + r2.width)
+			       && coord_cross(r1.y, r1.y + r1.height, r2.y, r2.y + r2.height);
+		}
+
 		internal bool point_belong (Float128 p, Float128 a, Float128 b) {
 			if (a > b) { Float128 tmp = a; a = b; b = tmp; }
 			if (a <= p <= b) return true;
diff --git a/src/Series.vala b/src/Series.vala
index 27a389d..674be21 100644
--- a/src/Series.vala
+++ b/src/Series.vala
@@ -188,7 +188,7 @@ namespace CairoChart {
 				for (int sk = si; sk > sj; --sk) {
 					var s3 = chart.series[sk];
 					if (!s3.zoom_show) continue;
-					if (Math.are_intersect(s2.place.zoom_x_min, s2.place.zoom_x_max, s3.place.zoom_x_min, s3.place.zoom_x_max)
+					if (Math.coord_cross(s2.place.zoom_x_min, s2.place.zoom_x_max, s3.place.zoom_x_min, s3.place.zoom_x_max)
 					    || s2.axis_x.position != s3.axis_x.position
 					    || s2.axis_x.type != s3.axis_x.type) {
 						has_intersection = true;
@@ -226,7 +226,7 @@ namespace CairoChart {
 				for (int sk = si; sk > sj; --sk) {
 					var s3 = chart.series[sk];
 					if (!s3.zoom_show) continue;
-					if (Math.are_intersect(s2.place.zoom_y_min, s2.place.zoom_y_max, s3.place.zoom_y_min, s3.place.zoom_y_max)
+					if (Math.coord_cross(s2.place.zoom_y_min, s2.place.zoom_y_max, s3.place.zoom_y_min, s3.place.zoom_y_max)
 					    || s2.axis_y.position != s3.axis_y.position
 					    || s2.axis_y.type != s3.axis_y.type) {
 						has_intersection = true;