From 86615d4161b050fbf3335e30ae85801aa1cefe92 Mon Sep 17 00:00:00 2001
From: Willem Jan Palenstijn <wjp@usecode.org>
Date: Wed, 1 Dec 2021 14:43:03 +0100
Subject: Move bounding box projection to ProjectionGeometry3D

---
 src/ProjectionGeometry3D.cpp | 60 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)

(limited to 'src/ProjectionGeometry3D.cpp')

diff --git a/src/ProjectionGeometry3D.cpp b/src/ProjectionGeometry3D.cpp
index 71c8df5..39c9af5 100644
--- a/src/ProjectionGeometry3D.cpp
+++ b/src/ProjectionGeometry3D.cpp
@@ -249,4 +249,64 @@ bool CProjectionGeometry3D::_initialize(int _iProjectionAngleCount,
 	return true;
 }
 
+void CProjectionGeometry3D::getProjectedBBox(double fXMin, double fXMax,
+                                             double fYMin, double fYMax,
+                                             double fZMin, double fZMax,
+                                             double &fUMin, double &fUMax,
+                                             double &fVMin, double &fVMax) const
+{
+	double vmin_g, vmax_g;
+	double umin_g, umax_g;
+
+	// Default implementation, correct for flat panel detectors:
+	// Project corners of volume, take bounding box
+
+	assert(getProjectionCount() > 0);
+	for (int i = 0; i < getProjectionCount(); ++i) {
+
+		double vol_u[8];
+		double vol_v[8];
+
+		projectPoint(fXMin, fYMin, fZMin, i, vol_u[0], vol_v[0]);
+		projectPoint(fXMin, fYMin, fZMax, i, vol_u[1], vol_v[1]);
+		projectPoint(fXMin, fYMax, fZMin, i, vol_u[2], vol_v[2]);
+		projectPoint(fXMin, fYMax, fZMax, i, vol_u[3], vol_v[3]);
+		projectPoint(fXMax, fYMin, fZMin, i, vol_u[4], vol_v[4]);
+		projectPoint(fXMax, fYMin, fZMax, i, vol_u[5], vol_v[5]);
+		projectPoint(fXMax, fYMax, fZMin, i, vol_u[6], vol_v[6]);
+		projectPoint(fXMax, fYMax, fZMax, i, vol_u[7], vol_v[7]);
+
+		double umin = vol_u[0];
+		double umax = vol_u[0];
+		double vmin = vol_v[0];
+		double vmax = vol_v[0];
+
+		for (int j = 1; j < 8; ++j) {
+			if (vol_u[j] < umin)
+				umin = vol_u[j];
+			if (vol_u[j] > umax)
+				umax = vol_u[j];
+			if (vol_v[j] < vmin)
+				vmin = vol_v[j];
+			if (vol_v[j] > vmax)
+				vmax = vol_v[j];
+		}
+
+		if (i == 0 || umin < umin_g)
+			umin_g = umin;
+		if (i == 0 || umax > umax_g)
+			umax_g = umax;
+		if (i == 0 || vmin < vmin_g)
+			vmin_g = vmin;
+		if (i == 0 || vmax > vmax_g)
+			vmax_g = vmax;
+	}
+
+	fUMin = umin_g;
+	fUMax = umax_g;
+	fVMin = vmin_g;
+	fVMax = vmax_g;
+}
+
+
 } // namespace astra
-- 
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