diff options
Diffstat (limited to 'muse2/muse/widgets/meter.cpp')
| -rw-r--r-- | muse2/muse/widgets/meter.cpp | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/muse2/muse/widgets/meter.cpp b/muse2/muse/widgets/meter.cpp new file mode 100644 index 00000000..6619d1dc --- /dev/null +++ b/muse2/muse/widgets/meter.cpp @@ -0,0 +1,217 @@ +//========================================================= +// MusE +// Linux Music Editor +// $Id: meter.cpp,v 1.4.2.2 2009/05/03 04:14:00 terminator356 Exp $ +// +// (C) Copyright 2000 Werner Schweer (ws@seh.de) +//========================================================= + +#include <stdio.h> +#include <cmath> + +#include <QMouseEvent> +#include <QPainter> +#include <QResizeEvent> + +#include "meter.h" +#include "gconfig.h" +#include "fastlog.h" + +//--------------------------------------------------------- +// Meter +//--------------------------------------------------------- + +Meter::Meter(QWidget* parent, MeterType type) + : QFrame(parent) //Qt::WNoAutoErase + { + setBackgroundRole(QPalette::NoRole); + setAttribute(Qt::WA_NoSystemBackground); + setAttribute(Qt::WA_StaticContents); + // This is absolutely required for speed! Otherwise painfully slow because we get + // full rect paint events even on small scrolls! See help on QPainter::scroll(). + setAttribute(Qt::WA_OpaquePaintEvent); + + mtype = type; + overflow = false; + val = 0.0; + maxVal = 0.0; + minScale = mtype == DBMeter ? config.minMeter : 0.0; // min value in dB or int + maxScale = mtype == DBMeter ? 10.0 : 127.0; + yellowScale = -10; + redScale = 0; + setLineWidth(0); + setMidLineWidth(0); + } + +//--------------------------------------------------------- +// setVal +//--------------------------------------------------------- + +void Meter::setVal(double v, double max, bool ovl) + { + overflow = ovl; + bool ud = false; + + if(mtype == DBMeter) + { + double minScaleLin = pow(10.0, minScale/20.0); + if((v >= minScaleLin && val != v) || val >= minScaleLin) + { + val = v; + ud = true; + } + } + else + { + if(val != v) + { + val = v; + ud = true; + } + } + + if(maxVal != max) + { + maxVal = max; + ud = true; + } + + if(ud) + update(); + } +//--------------------------------------------------------- +// resetPeaks +// reset peak and overflow indicator +//--------------------------------------------------------- + +void Meter::resetPeaks() + { + maxVal = val; + overflow = val > 0.0; + update(); + } + +//--------------------------------------------------------- +// setRange +//--------------------------------------------------------- + +void Meter::setRange(double min, double max) + { + minScale = min; + maxScale = max; + update(); + } + +//--------------------------------------------------------- +// paintEvent +//--------------------------------------------------------- + +void Meter::paintEvent(QPaintEvent* /*ev*/) + { + // TODO: Could make better use of event rectangle, for speed. + + QPainter p(this); + + double range = maxScale - minScale; + + int fw = frameWidth(); + int w = width() - 2*fw; + int h = height() - 2*fw; + int yv; + + if(mtype == DBMeter) + yv = val == 0 ? h : int(((maxScale - (fast_log10(val) * 20.0)) * h)/range); + else + yv = val == 0 ? h : int(((maxScale - val) * h)/range); + + if(yv > h) yv = h; + + // Draw the red, green, and yellow sections. + drawVU(p, w, h, yv); + + // Draw the peak white line. + int ymax; + if(mtype == DBMeter) + ymax = maxVal == 0 ? 0 : int(((maxScale - (fast_log10(maxVal) * 20.0)) * h)/range); + else + ymax = maxVal == 0 ? 0 : int(((maxScale - maxVal) * h)/range); + p.setPen(Qt::white); + p.drawLine(0, ymax, w, ymax); + } + +//--------------------------------------------------------- +// drawVU +//--------------------------------------------------------- + +void Meter::drawVU(QPainter& p, int w, int h, int yv) +{ + if(mtype == DBMeter) + { + double range = maxScale - minScale; + int y1 = int((maxScale - redScale) * h / range); + int y2 = int((maxScale - yellowScale) * h / range); + + if(yv < y1) + { + // Red section: + p.fillRect(0, 0, w, yv, QBrush(0x8e0000)); // dark red + p.fillRect(0, yv, w, y1-yv, QBrush(0xff0000)); // light red + + // Yellow section: + p.fillRect(0, y1, w, y2-y1, QBrush(0xffff00)); // light yellow + + // Green section: + p.fillRect(0, y2, w, h-y2, QBrush(0x00ff00)); // light green + } + else + if(yv < y2) + { + // Red section: + p.fillRect(0, 0, w, y1, QBrush(0x8e0000)); // dark red + + // Yellow section: + p.fillRect(0, y1, w, yv-y1, QBrush(0x8e8e00)); // dark yellow + p.fillRect(0, yv, w, y2-yv, QBrush(0xffff00)); // light yellow + + // Green section: + p.fillRect(0, y2, w, h-y2, QBrush(0x00ff00)); // light green + } + else + //if(yv <= y3) + { + // Red section: + p.fillRect(0, 0, w, y1, QBrush(0x8e0000)); // dark red + + // Yellow section: + p.fillRect(0, y1, w, y2-y1, QBrush(0x8e8e00)); // dark yellow + + // Green section: + p.fillRect(0, y2, w, yv-y2, QBrush(0x007000)); // dark green + p.fillRect(0, yv, w, h-yv, QBrush(0x00ff00)); // light green + } + } + else + { + p.fillRect(0, 0, w, yv, QBrush(0x007000)); // dark green + p.fillRect(0, yv, w, h-yv, QBrush(0x00ff00)); // light green + } +} + +//--------------------------------------------------------- +// resizeEvent +//--------------------------------------------------------- + +void Meter::resizeEvent(QResizeEvent* /*ev*/) + { + + } + +//--------------------------------------------------------- +// mousePressEvent +//--------------------------------------------------------- + +void Meter::mousePressEvent(QMouseEvent*) + { + emit mousePress(); + } + |