Fix really stupid obvious bugs

git-svn-id: svn://cook.msm.cam.ac.uk:745/diff-tomo/dtr@134 bf6ca9ba-c028-0410-8290-897cf20841d1

1 files changed, 4 insertions, 3 deletions

diff --git a/src/control.c b/src/control.c
index 97ad34c..270be6f 100644
--- a/src/control.c
+++ b/src/control.c
@@ -11,6 +11,7 @@
 
 #include <inttypes.h>
 #include <stdlib.h>
+#include <math.h>
 
 #include "control.h"
 
@@ -71,7 +72,7 @@ double control_min_tilt(ControlContext *ctx) {
 
 }
 
-/* Return the maximum (most negative) tilt angle used */
+/* Return the maximum (most positive) tilt angle used */
 double control_max_tilt(ControlContext *ctx) {
 
 	int i;
@@ -93,8 +94,8 @@ ImageRecord *control_image_nearest_tilt(ControlContext *ctx, double tilt) {
 	ImageRecord *im = NULL;
 	
 	for ( i=0; i<ctx->n_images; i++ ) {
-		if ( ctx->images[i].tilt - tilt < dev ) {
-			dev = ctx->images[i].tilt - tilt;
+		if ( fabs(ctx->images[i].tilt - tilt) < dev ) {
+			dev = fabs(ctx->images[i].tilt - tilt);
 			im = &ctx->images[i];
 		}
 	}