From da37a84d5f8b2eeb1c41cba033abebdce12f148a Mon Sep 17 00:00:00 2001
From: ccolin
Date: Mon, 4 Jan 2021 01:29:44 +0100
Subject: add drone names when guides are enabled

---
 src/opengl_widget.cc | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

(limited to 'src/opengl_widget.cc')

diff --git a/src/opengl_widget.cc b/src/opengl_widget.cc
index 2100af0..a4d9c8c 100644
--- a/src/opengl_widget.cc
+++ b/src/opengl_widget.cc
@@ -176,7 +176,7 @@ void OpenGLWidget::resizeGL(int w, int h) {
 
 
 void OpenGLWidget::paintGL() {
-	glEnable(GL_CULL_FACE); // i shouldn't have to do this every frame, should i?
+	glEnable(GL_CULL_FACE);
 	glEnable(GL_DEPTH_TEST);
 	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 	QMatrix4x4 trans;
@@ -258,3 +258,19 @@ QOpenGLShaderProgram *OpenGLWidget::getMainProgram() {
 QOpenGLShaderProgram *OpenGLWidget::getLineProgram() {
 	return &line_program;
 }
+
+
+bool OpenGLWidget::project(const QVector3D &p, QPoint &point) const {
+	QMatrix4x4 trans;
+	trans.translate(0, 0, -cam_dist);
+	QMatrix4x4 view = trans * rot;
+	QVector3D projected = proj * view * p;
+	if (projected.x() < -1 || projected.x() > 1
+		|| projected.y() < -1 || projected.y() > 1
+		|| projected.z() < -1 || projected.z() > 1) {
+		return false;
+	}
+	point.setX((projected.x() / 2 + .5) * (float) width());
+	point.setY(((projected.y() / 2 - .5) * -1) * (float) height());
+	return true;
+}
-- 
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