#!/usr/bin/env python3 # -*- coding: utf-8 -*- # Digital Peak Meter, a custom Qt4 widget # Copyright (C) 2011-2013 Filipe Coelho # # 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; either version 2 of # the License, or any later version. # # 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. # # For a full copy of the GNU General Public License see the GPL.txt file # ------------------------------------------------------------------------------------------------------------ # Imports (Global) from PyQt4.QtCore import qCritical, Qt, QTimer, QSize from PyQt4.QtGui import QColor, QLinearGradient, QPainter, QWidget # ------------------------------------------------------------------------------------------------------------ # Widget Class class DigitalPeakMeter(QWidget): # enum Orientation HORIZONTAL = 1 VERTICAL = 2 # enum Color GREEN = 1 BLUE = 2 def __init__(self, parent): QWidget.__init__(self, parent) self.fChannels = 0 self.fOrientation = self.VERTICAL self.fSmoothMultiplier = 1 self.fColorBackground = QColor("#111111") self.fGradientMeter = QLinearGradient(0, 0, 1, 1) self.setChannels(0) self.setColor(self.GREEN) self.fPaintTimer = QTimer(self) self.fPaintTimer.setInterval(60) self.fPaintTimer.timeout.connect(self.update) self.fPaintTimer.start() def displayMeter(self, meter, level): if meter <= 0 or meter > self.fChannels: return qCritical("DigitalPeakMeter::displayMeter(%i, %f) - invalid meter number" % (meter, level)) if level < 0.0: level = -level elif level > 1.0: level = 1.0 self.fChannelsData[meter-1] = float(level) def setChannels(self, channels): if channels < 0: return qCritical("DigitalPeakMeter::setChannels(%i) - 'channels' must be a positive integer" % channels) self.fChannels = channels self.fChannelsData = [] self.fLastValueData = [] for x in range(channels): self.fChannelsData.append(0.0) self.fLastValueData.append(0.0) def setColor(self, color): if color == self.GREEN: self.fColorBase = QColor(93, 231, 61) self.fColorBaseAlt = QColor(15, 110, 15, 100) elif color == self.BLUE: self.fColorBase = QColor(82, 238, 248) self.fColorBaseAlt = QColor(15, 15, 110, 100) else: return qCritical("DigitalPeakMeter::setColor(%i) - invalid color" % color) self.setOrientation(self.fOrientation) def setOrientation(self, orientation): self.fOrientation = orientation if self.fOrientation == self.HORIZONTAL: self.fGradientMeter.setColorAt(0.0, self.fColorBase) self.fGradientMeter.setColorAt(0.2, self.fColorBase) self.fGradientMeter.setColorAt(0.4, self.fColorBase) self.fGradientMeter.setColorAt(0.6, self.fColorBase) self.fGradientMeter.setColorAt(0.8, Qt.yellow) self.fGradientMeter.setColorAt(1.0, Qt.red) elif self.fOrientation == self.VERTICAL: self.fGradientMeter.setColorAt(0.0, Qt.red) self.fGradientMeter.setColorAt(0.2, Qt.yellow) self.fGradientMeter.setColorAt(0.4, self.fColorBase) self.fGradientMeter.setColorAt(0.6, self.fColorBase) self.fGradientMeter.setColorAt(0.8, self.fColorBase) self.fGradientMeter.setColorAt(1.0, self.fColorBase) else: return qCritical("DigitalPeakMeter::setOrientation(%i) - invalid orientation" % orientation) self.updateSizes() def setRefreshRate(self, rate): self.fPaintTimer.stop() self.fPaintTimer.setInterval(rate) self.fPaintTimer.start() def setSmoothRelease(self, value): if value < 0: value = 0 elif value > 5: value = 5 self.fSmoothMultiplier = value def minimumSizeHint(self): return QSize(10, 10) def sizeHint(self): return QSize(self.fWidth, self.fHeight) def updateSizes(self): self.fWidth = self.width() self.fHeight = self.height() self.fSizeMeter = 0 if self.fOrientation == self.HORIZONTAL: self.fGradientMeter.setFinalStop(self.fWidth, 0) if self.fChannels > 0: self.fSizeMeter = self.fHeight / self.fChannels elif self.fOrientation == self.VERTICAL: self.fGradientMeter.setFinalStop(0, self.fHeight) if self.fChannels > 0: self.fSizeMeter = self.fWidth / self.fChannels def paintEvent(self, event): painter = QPainter(self) event.accept() painter.setPen(Qt.black) painter.setBrush(Qt.black) painter.drawRect(0, 0, self.fWidth, self.fHeight) meterX = 0 painter.setPen(self.fColorBackground) painter.setBrush(self.fGradientMeter) for i in range(self.fChannels): level = self.fChannelsData[i] if level == self.fLastValueData[i]: continue if self.fOrientation == self.HORIZONTAL: value = level * float(self.fWidth) elif self.fOrientation == self.VERTICAL: value = float(self.fHeight) - (level * float(self.fHeight)) else: value = 0.0 if value < 0.0: value = 0.0 elif self.fSmoothMultiplier > 0: value = (self.fLastValueData[i] * self.fSmoothMultiplier + value) / float(self.fSmoothMultiplier + 1) if self.fOrientation == self.HORIZONTAL: painter.drawRect(0, meterX, int(value), self.fSizeMeter) elif self.fOrientation == self.VERTICAL: painter.drawRect(meterX, int(value), self.fSizeMeter, self.fHeight) meterX += self.fSizeMeter self.fLastValueData[i] = value painter.setBrush(Qt.black) if self.fOrientation == self.HORIZONTAL: # Variables lsmall = float(self.fWidth) lfull = float(self.fHeight - 1) # Base painter.setPen(self.fColorBaseAlt) painter.drawLine(lsmall * 0.25, 2, lsmall * 0.25, lfull-2.0) painter.drawLine(lsmall * 0.50, 2, lsmall * 0.50, lfull-2.0) # Yellow painter.setPen(QColor(110, 110, 15, 100)) painter.drawLine(lsmall * 0.70, 2, lsmall * 0.70, lfull-2.0) painter.drawLine(lsmall * 0.83, 2, lsmall * 0.83, lfull-2.0) # Orange painter.setPen(QColor(180, 110, 15, 100)) painter.drawLine(lsmall * 0.90, 2, lsmall * 0.90, lfull-2.0) # Red painter.setPen(QColor(110, 15, 15, 100)) painter.drawLine(lsmall * 0.96, 2, lsmall * 0.96, lfull-2.0) elif self.fOrientation == self.VERTICAL: # Variables lsmall = float(self.fHeight) lfull = float(self.fWidth - 1) # Base painter.setPen(self.fColorBaseAlt) painter.drawLine(2, lsmall - (lsmall * 0.25), lfull-2.0, lsmall - (lsmall * 0.25)) painter.drawLine(2, lsmall - (lsmall * 0.50), lfull-2.0, lsmall - (lsmall * 0.50)) # Yellow painter.setPen(QColor(110, 110, 15, 100)) painter.drawLine(2, lsmall - (lsmall * 0.70), lfull-2.0, lsmall - (lsmall * 0.70)) painter.drawLine(2, lsmall - (lsmall * 0.82), lfull-2.0, lsmall - (lsmall * 0.82)) # Orange painter.setPen(QColor(180, 110, 15, 100)) painter.drawLine(2, lsmall - (lsmall * 0.90), lfull-2.0, lsmall - (lsmall * 0.90)) # Red painter.setPen(QColor(110, 15, 15, 100)) painter.drawLine(2, lsmall - (lsmall * 0.96), lfull-2.0, lsmall - (lsmall * 0.96)) def resizeEvent(self, event): self.updateSizes() QWidget.resizeEvent(self, event)