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# This file is part of jack_mixer
#
# Copyright (C) 2006 Nedko Arnaudov <nedko@arnaudov.name>
#
# This program 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; version 2 of the License
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
import gtk
import cairo
class MeterWidget(gtk.DrawingArea):
def __init__(self, scale):
gtk.DrawingArea.__init__(self)
self.scale = scale
self.connect("expose-event", self.on_expose)
self.connect("size-request", self.on_size_request)
self.connect("size_allocate", self.on_size_allocate)
self.color_bg = gtk.gdk.Color(0,0,0)
self.color_value = None
self.color_mark = gtk.gdk.Color(int(65535 * 0.2), int(65535 * 0.2), int(65535 * 0.2))
self.width = 0
self.height = 0
self.cache_surface = None
def set_color(self, color):
self.color_value = color
self.cache_surface = None
self.invalidate_all()
def on_expose(self, widget, event):
cairo_ctx = widget.window.cairo_create()
# set a clip region for the expose event
cairo_ctx.rectangle(event.area.x, event.area.y, event.area.width, event.area.height)
cairo_ctx.clip()
self.draw(cairo_ctx)
return False
def on_size_allocate(self, widget, allocation):
#print allocation.x, allocation.y, allocation.width, allocation.height
self.width = float(allocation.width)
self.height = float(allocation.height)
self.font_size = 10
self.cache_surface = None
def on_size_request(self, widget, requisition):
#print "size-request, %u x %u" % (requisition.width, requisition.height)
requisition.width = 20
return
def invalidate_all(self):
self.queue_draw_area(0, 0, int(self.width), int(self.height))
def draw_background(self, cairo_ctx):
if not self.cache_surface:
self.cache_surface = cairo.Surface.create_similar(
cairo_ctx.get_target(),
cairo.CONTENT_COLOR,
int(self.width),
int(self.height))
cache_cairo_ctx = cairo.Context(self.cache_surface)
cache_cairo_ctx.set_source_rgba(0, 0, 0, 0)
cache_cairo_ctx.rectangle(0, 0, self.width, self.height)
cache_cairo_ctx.fill()
cache_cairo_ctx.set_source_rgba(0.2, 0.2, 0.2, 1)
cache_cairo_ctx.select_font_face("Fixed")
cache_cairo_ctx.set_font_size(self.font_size)
glyph_width = self.font_size * 3 / 5 # avarage glyph ratio
for mark in self.scale.get_marks():
mark_position = int(self.height * (1 - mark.scale))
cache_cairo_ctx.move_to(0, mark_position)
cache_cairo_ctx.line_to(self.width, mark_position)
cache_cairo_ctx.stroke()
x_correction = self.width / 2 - glyph_width * len(mark.text) / 2
cache_cairo_ctx.move_to(x_correction, mark_position - 2)
cache_cairo_ctx.show_text(mark.text)
cairo_ctx.set_source_surface(self.cache_surface, 0, 0)
cairo_ctx.paint()
def draw_value(self, cairo_ctx, value, x, width):
if self.color_value is not None:
cairo_ctx.set_source_color(self.color_value)
else:
height = self.allocation.height
gradient = cairo.LinearGradient(1, 1, width-1, height-1)
gradient.add_color_stop_rgb(0, 1, 0, 0)
gradient.add_color_stop_rgb(0.2, 1, 1, 0)
gradient.add_color_stop_rgb(1, 0, 1, 0)
cairo_ctx.set_source(gradient)
cairo_ctx.rectangle(x, self.height * (1 - value), width, self.height * value)
cairo_ctx.fill()
def set_scale(self, scale):
self.scale = scale
self.cache_surface = None
self.invalidate_all()
class MonoMeterWidget(MeterWidget):
def __init__(self, scale):
MeterWidget.__init__(self, scale)
self.value = 0.0
self.raw_value = 0.0
def draw(self, cairo_ctx):
self.draw_background(cairo_ctx)
self.draw_value(cairo_ctx, self.value, self.width/4.0, self.width/2.0)
def set_value(self, value):
if value != self.raw_value:
self.raw_value = value
self.value = self.scale.db_to_scale(value)
self.invalidate_all()
if value == self.raw_value:
return
self.raw_value = value
old_value = self.value
self.value = self.scale.db_to_scale(value)
if (abs(old_value-self.value) * self.height) > 1:
self.invalidate_all()
class StereoMeterWidget(MeterWidget):
def __init__(self, scale):
MeterWidget.__init__(self, scale)
self.left = 0.0
self.right = 0.0
self.raw_left = 0.0
self.raw_right = 0.0
def draw(self, cairo_ctx):
self.draw_background(cairo_ctx)
self.draw_value(cairo_ctx, self.left, self.width/5.0, self.width/5.0)
self.draw_value(cairo_ctx, self.right, self.width/5.0 * 3.0, self.width/5.0)
def set_values(self, left, right):
if left == self.raw_left and right == self.raw_right:
return
self.raw_left = left
self.raw_right = right
old_left = self.left
old_right = self.right
self.left = self.scale.db_to_scale(left)
self.right = self.scale.db_to_scale(right)
if (abs(old_left-self.left) * self.height) > 1 or (abs(old_right-self.right) * self.height) > 1:
self.invalidate_all()
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