From 7a100b773324421ca0739084f2afd24cdde2693f Mon Sep 17 00:00:00 2001
From: Thomas White <taw@physics.org>
Date: Sat, 15 Jun 2019 10:12:31 +0200
Subject: Hold shift for fine control

---
 src/nanolight.c | 37 ++++++++++++++++++++++++++++++-------
 src/nanolight.h |  1 +
 2 files changed, 31 insertions(+), 7 deletions(-)

diff --git a/src/nanolight.c b/src/nanolight.c
index fe4d1a5..40c8bd1 100644
--- a/src/nanolight.c
+++ b/src/nanolight.c
@@ -395,37 +395,60 @@ static gboolean button_release_sig(GtkWidget *da, GdkEventButton *event, struct
 }
 
 
+static double maybe_fine(struct fixture *fix, int n, double inc, int shift)
+{
+	if ( !(fix->cls->attrs[n].props & ATTR_16BIT) ) return inc;
+	if ( shift ) return inc;
+	return inc * 100.0;
+}
+
+
 static gboolean motion_sig(GtkWidget *da, GdkEventMotion *event, struct nanolight *nl)
 {
 	int i;
+	double x_inc, y_inc;
+	int shift;
 
 	if ( !nl->dragging ) return FALSE;
 
+	x_inc = (event->x - nl->x_orig)/3;
+	y_inc = (nl->y_orig - event->y)/3;  /* Mouse up means increase */
+
+	shift = event->state & GDK_SHIFT_MASK;
+	if ( shift != nl->fine ) {
+		nl->fine = shift;
+		set_start_attrs(nl, nl->sel_attr);
+		nl->x_orig = event->x;
+		nl->y_orig = event->y;
+		return FALSE;
+	}
+
 	if ( nl->sel_attr == ATT_TILT ) {
-		double pan_inc, tilt_inc;
-		pan_inc = 9*(event->x - nl->x_orig);
-		tilt_inc = 9*(event->y - nl->y_orig);
 		for ( i=0; i<nl->n_sel; i++ ) {
 			int n;
 			struct fixture *fix = &nl->fixtures[nl->selection[i]];
 			if ( find_attribute(fix, ATT_PAN, &n) ) {
-				signed int nv = fix->attr_vals_start[n] + pan_inc;
+				double inc = maybe_fine(fix, n, x_inc,
+				                        event->state & GDK_SHIFT_MASK);
+				signed int nv = fix->attr_vals_start[n] + inc;
 				cap_value(fix, n, &nv);
 				fix->attr_vals[n] = nv;
 			}
 			if ( find_attribute(fix, ATT_TILT, &n) ) {
-				signed int nv = fix->attr_vals_start[n] + tilt_inc;
+				double inc = maybe_fine(fix, n, y_inc,
+				                        event->state & GDK_SHIFT_MASK);
+				signed int nv = fix->attr_vals_start[n] + inc;
 				cap_value(fix, n, &nv);
 				fix->attr_vals[n] = nv;
 			}
 		}
 	} else {
-		double inc;
-		inc = event->y - nl->y_orig;
 		for ( i=0; i<nl->n_sel; i++ ) {
 			int n;
 			struct fixture *fix = &nl->fixtures[nl->selection[i]];
 			if ( find_attribute(fix, nl->sel_attr, &n) ) {
+				double inc = maybe_fine(fix, n, y_inc,
+				                        event->state & GDK_SHIFT_MASK);
 				signed int nv = fix->attr_vals_start[n] + inc;
 				cap_value(fix, n, &nv);
 				fix->attr_vals[n] = nv;
diff --git a/src/nanolight.h b/src/nanolight.h
index e5540f5..5947665 100644
--- a/src/nanolight.h
+++ b/src/nanolight.h
@@ -94,6 +94,7 @@ struct nanolight
 	int n_sel;
 	enum attr_class sel_attr;
 	int dragging;
+	int fine;
 
 	double x_orig;
 	double y_orig;
-- 
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