From 35ecb47892057c6650fc661a1561a1927ab4e525 Mon Sep 17 00:00:00 2001
From: Thomas White <taw@physics.org>
Date: Tue, 11 Jun 2019 23:33:25 +0200
Subject: Show crosshairs for pan/tilt

---
 src/nanolight.c | 55 +++++++++++++++++++++++++++++++++++++++----------------
 1 file changed, 39 insertions(+), 16 deletions(-)

diff --git a/src/nanolight.c b/src/nanolight.c
index 6f6ebab..c4cc480 100644
--- a/src/nanolight.c
+++ b/src/nanolight.c
@@ -71,18 +71,51 @@ static int fixture_selected(struct nanolight *nl, struct fixture *fix)
 }
 
 
+static int find_attribute(struct fixture *fix, enum attr_class cls, int *n)
+{
+	int j;
+	for ( j=0; j<fix->cls->n_attrs; j++ ) {
+		if ( fix->cls->attrs[j].cls == cls ) {
+			*n = j;
+			return 1;
+		}
+	}
+	return 0;
+}
+
+
 static void draw_fixture(cairo_t *cr, PangoContext *pc, PangoFontDescription *fontdesc,
                          struct nanolight *nl, struct fixture *fix)
 {
 	PangoLayout *layout;
 	const double w = 40.0;
+	const double h = 3.0/2.0*w;
 	char tmp[32];
+	int n;
+
+	/* Pan/tilt (underneath rectangle) */
+	if ( find_attribute(fix, ATT_PAN, &n) ) {
+		double x = w*fix->attr_vals[n] / 65535;
+		cairo_move_to(cr, x, -1.0);
+		cairo_line_to(cr, x, h+2.0);
+		cairo_set_source_rgb(cr, 1.0, 0.0, 0.0);
+		cairo_set_line_width(cr, 1.0);
+		cairo_stroke(cr);
+	}
+	if ( find_attribute(fix, ATT_TILT, &n) ) {
+		double y = h*fix->attr_vals[n] / 65535;
+		cairo_move_to(cr, -1.0, y);
+		cairo_line_to(cr, w+2.0, y);
+		cairo_set_source_rgb(cr, 1.0, 0.0, 0.0);
+		cairo_set_line_width(cr, 1.0);
+		cairo_stroke(cr);
+	}
 
-	cairo_rectangle(cr, 0.5, 0.5, w, 3.0/2.0*w);
+	cairo_rectangle(cr, 0.5, 0.5, w, h);
 	if ( fixture_selected(nl, fix) ) {
-		cairo_set_source_rgb(cr, 0.3, 0.3, 0.9);
+		cairo_set_source_rgba(cr, 0.3, 0.3, 0.9, 0.9);
 	} else {
-		cairo_set_source_rgb(cr, 0.3, 0.3, 0.3);
+		cairo_set_source_rgba(cr, 0.3, 0.3, 0.3, 0.9);
 	}
 	cairo_fill_preserve(cr);
 	cairo_set_source_rgb(cr, 1.0, 1.0, 1.0);
@@ -257,19 +290,6 @@ static size_t delete_char(char *str)
 }
 
 
-static int find_attribute(struct fixture *fix, enum attr_class cls, int *n)
-{
-	int j;
-	for ( j=0; j<fix->cls->n_attrs; j++ ) {
-		if ( fix->cls->attrs[j].cls == cls ) {
-			*n = j;
-			return 1;
-		}
-	}
-	return 0;
-}
-
-
 static void cap_value(struct fixture *fix, int n, signed int *v)
 {
 	if ( *v < 0 ) *v = 0;
@@ -320,6 +340,8 @@ static gboolean motion_sig(GtkWidget *da, GdkEventMotion *event, struct nanoligh
 		}
 	}
 
+	redraw(nl);
+
 	return FALSE;
 }
 
@@ -366,6 +388,7 @@ static void home_value(struct nanolight *nl)
 		}
 
 	}
+	redraw(nl);
 }
 
 
-- 
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