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/*
* Copyright (C) 2002 2003 2004, Magnus Hjorth
*
* This file is part of mhWaveEdit.
*
* mhWaveEdit is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* mhWaveEdit is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with mhWaveEdit; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
*/
#include <config.h>
#include <math.h>
#include "main.h"
#include "vu_meter.h"
static void vu_meter_size_request(GtkWidget *widget, GtkRequisition *req)
{
req->width = 80;
req->height = 60;
}
static void draw_meter_line(VuMeter *v, GdkGC *gc)
{
guint w,h;
gfloat ang = (0.75-0.5*v->value)*3.1415;
gfloat len;
w = GTK_WIDGET(v)->allocation.width;
h = GTK_WIDGET(v)->allocation.height;
len = ((gfloat)h)*0.8;
gdk_draw_line(GTK_WIDGET(v)->window,gc,w/2,h,
w/2+(gint)(len*cos(ang)),h-(gint)(len*sin(ang)));
}
static void draw_black_arc(VuMeter *v)
{
GtkWidget *widget = GTK_WIDGET(v);
gdk_draw_arc(widget->window,widget->style->black_gc,1,
widget->allocation.width/2-15,
widget->allocation.height-15,30,30,0,180*64);
}
static gint vu_meter_expose(GtkWidget *widget, GdkEventExpose *event)
{
VuMeter *vu = VU_METER(widget);
guint w,h;
gfloat len;
w = widget->allocation.width;
h = widget->allocation.height;
len = ((gfloat)h)*0.8;
gdk_draw_rectangle(widget->window,widget->style->black_gc,0,0,0,w,h);
gdk_draw_rectangle(widget->window,widget->style->black_gc,0,1,1,w-2,h-2);
gdk_draw_rectangle(widget->window,widget->style->black_gc,0,2,2,w-4,h-4);
/* gdk_draw_rectangle(widget->window,widget->style->bg_gc[0],1,3,3,w-6,h-6); */
gdk_draw_arc(widget->window,widget->style->white_gc,1,w/2-len,h-len,
len*2,len*2,45*64,90*64);
draw_black_arc(vu);
draw_meter_line(vu,widget->style->black_gc);
return TRUE;
}
static void vu_meter_class_init(GtkWidgetClass *klass)
{
klass->size_request = vu_meter_size_request;
klass->expose_event = vu_meter_expose;
}
static void vu_meter_init(VuMeter *v)
{
v->value = 0.0;
v->goal = 0.0;
}
GtkType vu_meter_get_type(void)
{
static GtkType id = 0;
if (!id) {
GtkTypeInfo info = {
"VuMeter",
sizeof(VuMeter),
sizeof(VuMeterClass),
(GtkClassInitFunc) vu_meter_class_init,
(GtkObjectInitFunc) vu_meter_init
};
id = gtk_type_unique(gtk_drawing_area_get_type(),&info);
}
return id;
}
GtkWidget *vu_meter_new(gfloat value)
{
VuMeter *v;
v = gtk_type_new(vu_meter_get_type());
v->value = value;
v->goal = value;
g_get_current_time(&(v->valuetime));
return GTK_WIDGET(v);
}
static void vu_meter_update_value_real(VuMeter *v, GTimeVal *tv)
{
GTimeVal diff;
float f;
timeval_subtract(&diff,tv,&(v->valuetime));
f = ((float)diff.tv_usec) / 1000000.0 + ((float)diff.tv_sec);
v->value = v->value + (v->goal - v->value)*(1-exp(-f*10.0));
memcpy(&(v->valuetime),tv,sizeof(GTimeVal));
}
static void undraw_value(VuMeter *v)
{
draw_meter_line(v,GTK_WIDGET(v)->style->white_gc);
draw_black_arc(v);
}
static void draw_value(VuMeter *v)
{
draw_meter_line(v,GTK_WIDGET(v)->style->black_gc);
}
void vu_meter_update(VuMeter *v)
{
GTimeVal tv;
undraw_value(v);
g_get_current_time(&tv);
vu_meter_update_value_real(v,&tv);
draw_value(v);
}
void vu_meter_set_value(VuMeter *v, gfloat value)
{
GTimeVal tv;
undraw_value(v);
g_get_current_time(&tv);
vu_meter_update_value_real(v,&tv);
v->goal = value;
if (value > v->value) v->value = value;
draw_value(v);
}
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