From ec4017bb0ff221c5c3e192a165c8d60a54f3bedc Mon Sep 17 00:00:00 2001
From: ccolin
Date: Sun, 3 Jan 2021 17:10:26 +0100
Subject: highlight colliding drones

---
 src/drone_controller.cc | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'src/drone_controller.cc')

diff --git a/src/drone_controller.cc b/src/drone_controller.cc
index 3284acf..512ad23 100644
--- a/src/drone_controller.cc
+++ b/src/drone_controller.cc
@@ -45,14 +45,21 @@ DroneController::DroneController(const QJsonObject &json)
 
 
 void DroneController::draw(QOpenGLExtraFunctions *f) const {
+	const QVector<QPair<int, int>> &col = collisions[frame];
 	for (const Drone &d : drones) {
 		QMatrix4x4 mat;
 		mat.translate(d.getPos());
+		for (const QPair<int, int> &p : col) {
+			if (d.getId() == p.first || d.getId() == p.second) {
+				OpenGLWidget::instance->getMainProgram()->setUniformValue("highlight", true);
+			}
+		}
 		d.getMesh()->draw(f, mat);
 		if (draw_spheres) {
 			mat.scale(sphere_radius);
 			sphere->draw(f, mat);
 		}
+		OpenGLWidget::instance->getMainProgram()->setUniformValue("highlight", false);
 	}
 }
 
@@ -116,6 +123,7 @@ void DroneController::seek(int frame) {
 
 
 void DroneController::computeCollisions(double sphere_radius) {
+	collisions.clear();
 	double sqDist = sphere_radius * sphere_radius * 4;
 	for (int i = 0; i < duration; i++) {
 		for (Drone &a : drones) {
@@ -124,6 +132,7 @@ void DroneController::computeCollisions(double sphere_radius) {
 				b.setTo(i);
 				if (&a == &b) continue;
 				if (collides(a, b, sqDist)) {
+					collisions[i].append(QPair<int, int>(a.getId(), b.getId()));
 					emit collision(a.getId(), b.getId(), i);
 				}
 			}
-- 
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