only send draw updates if the diameter or value has changedHEADsvn2git-headexternals/flatgui

svn path=/trunk/externals/flatgui/; revision=16780

1 files changed, 6 insertions, 1 deletions

diff --git a/knob.c b/knob.c
index fdd8a93..818aa17 100644
--- a/knob.c
+++ b/knob.c
@@ -50,8 +50,10 @@ t_symbol *iemgui_key_sym=0;		/* taken from g_all_guis.c */
 typedef struct _knob			/* taken from Frank's modyfied g_all_guis.h */
 {
     t_iemgui x_gui;
+    int      x_prev_h;
     int      x_pos;
     int      x_val;
+    int      x_prev_val;
     int      x_lin0_log1;
     int      x_steady;
     double   x_min;
@@ -63,9 +65,12 @@ typedef struct _knob			/* taken from Frank's modyfied g_all_guis.h */
 
 static void knob_draw_update(t_knob *x, t_glist *glist)
 {
-    if (glist_isvisible(glist))
+    if (glist_isvisible(glist) && 
+        (x->x_gui.x_h != x->x_prev_h || x->x_val != x->x_prev_val))
     {
 	/* compute dial:*/ 
+        x->x_prev_h = x->x_gui.x_h;
+        x->x_prev_val = x->x_val;
 	float radius = 0.5*(float)x->x_gui.x_h;
 	double angle = 7.0/36.0 + 34.0/36.0*2.0*M_PI*( (double)x->x_val*0.01/(double)x->x_gui.x_h );
 	int start = -80;