Merge pull request #4367 from TheUbuntuGuy/master

Add new analyzer "Rainbow Dash"

data/data.qrc

@@ -342,6 +342,7 @@
         <file>providers/subsonic.png</file>
         <file>providers/ubuntuone.png</file>
         <file>providers/wikipedia.png</file>
+        <file>rainbowdash.png</file>
         <file>sample.mood</file>
         <file>schema/device-schema.sql</file>
         <file>schema/jamendo.sql</file>

src/CMakeLists.txt

@@ -75,6 +75,7 @@ set(SOURCES
   analyzers/blockanalyzer.cpp
   analyzers/boomanalyzer.cpp
   analyzers/nyancatanalyzer.cpp
+  analyzers/rainbowdashanalyzer.cpp
   analyzers/sonogram.cpp
   analyzers/turbine.cpp
 
@@ -407,6 +408,7 @@ set(HEADERS
   analyzers/blockanalyzer.h
   analyzers/boomanalyzer.h
   analyzers/nyancatanalyzer.h
+  analyzers/rainbowdashanalyzer.h
   analyzers/sonogram.h
   analyzers/turbine.h
 

src/analyzers/analyzercontainer.cpp

@@ -20,6 +20,7 @@
 #include "blockanalyzer.h"
 #include "boomanalyzer.h"
 #include "nyancatanalyzer.h"
+#include "rainbowdashanalyzer.h"
 #include "sonogram.h"
 #include "turbine.h"
 #include "core/logging.h"
@@ -74,6 +75,7 @@ AnalyzerContainer::AnalyzerContainer(QWidget* parent)
   AddAnalyzerType<Sonogram>();
   AddAnalyzerType<TurbineAnalyzer>();
   AddAnalyzerType<NyanCatAnalyzer>();
+  AddAnalyzerType<RainbowDashAnalyzer>();
 
   connect(mapper_, SIGNAL(mapped(int)), SLOT(ChangeAnalyzer(int)));
   disable_action_ = context_menu_->addAction(tr("No analyzer"), this,

src/analyzers/rainbowdashanalyzer.cpp

@@ -0,0 +1,177 @@
+/* This file is part of Clementine.
+   Copyright 2010, David Sansome <me@davidsansome.com>
+
+   Clementine 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 3 of the License, or
+   (at your option) any later version.
+
+   Clementine 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 Clementine.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "rainbowdashanalyzer.h"
+
+#include <cmath>
+
+#include <QTimerEvent>
+#include <QBrush>
+
+#include "core/arraysize.h"
+#include "core/logging.h"
+
+using Analyzer::Scope;
+
+const char* RainbowDashAnalyzer::kName = "Rainbow Dash";
+const float RainbowDashAnalyzer::kPixelScale = 0.02f;
+
+RainbowDashAnalyzer::RainbowDashAnalyzer(QWidget* parent)
+    : Analyzer::Base(parent, 9),
+      dash_(":/rainbowdash.png"),
+      timer_id_(startTimer(kFrameIntervalMs)),
+      frame_(0),
+      current_buffer_(0),
+      available_rainbow_width_(0),
+      px_per_frame_(0),
+      x_offset_(0),
+      background_brush_(QColor(0x38, 0x88, 0x00)) {
+  memset(history_, 0, arraysize(history_) * sizeof(*history_));
+
+  for (int i = 0; i < kRainbowBands; ++i) {
+    colors_[i] = QPen(QColor::fromHsv(i * 255 / kRainbowBands, 255, 255),
+                      kRainbowHeight / kRainbowBands, Qt::SolidLine,
+                      Qt::FlatCap, Qt::RoundJoin);
+
+    // pow constants computed so that
+    // | band_scale(0) | ~= .5 and | band_scale(5) | ~= 32
+    band_scale_[i] =
+        -std::cos(M_PI * i / (kRainbowBands - 1)) * 0.5 * std::pow(2.3, i);
+  }
+}
+
+void RainbowDashAnalyzer::transform(Scope& s) { m_fht->spectrum(&s.front()); }
+
+void RainbowDashAnalyzer::timerEvent(QTimerEvent* e) {
+  if (e->timerId() == timer_id_) {
+    frame_ = (frame_ + 1) % kDashFrameCount;
+  } else {
+    Analyzer::Base::timerEvent(e);
+  }
+}
+
+void RainbowDashAnalyzer::resizeEvent(QResizeEvent* e) {
+  // Invalidate the buffer so it's recreated from scratch in the next paint
+  // event.
+  buffer_[0] = QPixmap();
+  buffer_[1] = QPixmap();
+
+  available_rainbow_width_ = width() - kDashWidth + kRainbowOverlap;
+  px_per_frame_ = float(available_rainbow_width_) / (kHistorySize - 1) + 1;
+  x_offset_ = px_per_frame_ * (kHistorySize - 1) - available_rainbow_width_;
+}
+
+void RainbowDashAnalyzer::analyze(QPainter& p, const Analyzer::Scope& s,
+                                  bool new_frame) {
+  // Discard the second half of the transform
+  const int scope_size = s.size() / 2;
+
+  if ((new_frame && is_playing_) ||
+      (buffer_[0].isNull() && buffer_[1].isNull())) {
+    // Transform the music into rainbows!
+    for (int band = 0; band < kRainbowBands; ++band) {
+      float* band_start = history_ + band * kHistorySize;
+
+      // Move the history of each band across by 1 frame.
+      memmove(band_start, band_start + 1, (kHistorySize - 1) * sizeof(float));
+    }
+
+    // Now accumulate the scope data into each band.  Should maybe use a series
+    // of band pass filters for this, so bands can leak into neighbouring bands,
+    // but for now it's a series of separate square filters.
+    const int samples_per_band = scope_size / kRainbowBands;
+    int sample = 0;
+    for (int band = 0; band < kRainbowBands; ++band) {
+      float accumulator = 0.0;
+      for (int i = 0; i < samples_per_band; ++i) {
+        accumulator += s[sample++];
+      }
+      history_[(band + 1) * kHistorySize - 1] = accumulator * band_scale_[band];
+    }
+
+    // Create polylines for the rainbows.
+    QPointF polyline[kRainbowBands * kHistorySize];
+    QPointF* dest = polyline;
+    float* source = history_;
+
+    const float top_of_Dash = float(height()) / 2 - float(kRainbowHeight) / 2;
+    for (int band = 0; band < kRainbowBands; ++band) {
+      // Calculate the Y position of this band.
+      const float y =
+          float(kRainbowHeight) / (kRainbowBands + 1) * (band + 0.5) +
+          top_of_Dash;
+
+      // Add each point in the line.
+      for (int x = 0; x < kHistorySize; ++x) {
+        *dest = QPointF(px_per_frame_ * x, y + *source * kPixelScale);
+        ++dest;
+        ++source;
+      }
+    }
+
+    // Do we have to draw the whole rainbow into the buffer?
+    if (buffer_[0].isNull()) {
+      for (int i = 0; i < 2; ++i) {
+        buffer_[i] = QPixmap(QSize(width() + x_offset_, height()));
+        buffer_[i].fill(background_brush_.color());
+      }
+      current_buffer_ = 0;
+
+      QPainter buffer_painter(&buffer_[0]);
+      buffer_painter.setRenderHint(QPainter::Antialiasing);
+      for (int band = kRainbowBands - 1; band >= 0; --band) {
+        buffer_painter.setPen(colors_[band]);
+        buffer_painter.drawPolyline(&polyline[band * kHistorySize],
+                                    kHistorySize);
+        buffer_painter.drawPolyline(&polyline[band * kHistorySize],
+                                    kHistorySize);
+      }
+    } else {
+      const int last_buffer = current_buffer_;
+      current_buffer_ = (current_buffer_ + 1) % 2;
+
+      // We can just shuffle the buffer along a bit and draw the new frame's
+      // data.
+      QPainter buffer_painter(&buffer_[current_buffer_]);
+      buffer_painter.setRenderHint(QPainter::Antialiasing);
+
+      buffer_painter.drawPixmap(
+          0, 0, buffer_[last_buffer], px_per_frame_, 0,
+          x_offset_ + available_rainbow_width_ - px_per_frame_, 0);
+      buffer_painter.fillRect(
+          x_offset_ + available_rainbow_width_ - px_per_frame_, 0,
+          kDashWidth - kRainbowOverlap + px_per_frame_, height(),
+          background_brush_);
+
+      for (int band = kRainbowBands - 1; band >= 0; --band) {
+        buffer_painter.setPen(colors_[band]);
+        buffer_painter.drawPolyline(&polyline[(band + 1) * kHistorySize - 3],
+                                    3);
+      }
+    }
+  }
+
+  // Draw the buffer on to the widget
+  p.drawPixmap(0, 0, buffer_[current_buffer_], x_offset_, 0, 0, 0);
+
+  if (!is_playing_) {
+    // Ssshhh!
+    p.drawPixmap(SleepingDashDestRect(), dash_, SleepingDashSourceRect());
+  } else {
+    p.drawPixmap(DashDestRect(), dash_, DashSourceRect());
+  }
+}

src/analyzers/rainbowdashanalyzer.h

@@ -0,0 +1,106 @@
+/* This file is part of Clementine.
+   Copyright 2010, David Sansome <me@davidsansome.com>
+
+   Clementine 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 3 of the License, or
+   (at your option) any later version.
+
+   Clementine 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 Clementine.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef RAINBOWDASHANALYZER_H
+#define RAINBOWDASHANALYZER_H
+
+#include "analyzerbase.h"
+
+#include <QDateTime>
+
+class RainbowDashAnalyzer : public Analyzer::Base {
+  Q_OBJECT
+
+ public:
+  Q_INVOKABLE RainbowDashAnalyzer(QWidget* parent);
+
+  static const char* kName;
+
+ protected:
+  void transform(Analyzer::Scope&);
+  void analyze(QPainter& p, const Analyzer::Scope&, bool new_frame);
+
+  void timerEvent(QTimerEvent* e);
+  void resizeEvent(QResizeEvent* e);
+
+ private:
+  static const int kDashHeight = 30;
+  static const int kDashWidth = 54;
+  static const int kRainbowHeight = 16;
+  static const int kDashFrameCount = 1;
+  static const int kRainbowOverlap = 15;
+  static const int kSleepingDashHeight = 30;
+
+  static const int kHistorySize = 128;
+  static const int kRainbowBands = 6;
+  static const float kPixelScale;
+
+  static const int kFrameIntervalMs = 150;
+
+ private:
+  inline QRect DashSourceRect() const {
+    return QRect(0, kDashHeight * frame_, kDashWidth, kDashHeight);
+  }
+
+  inline QRect SleepingDashSourceRect() const {
+    return QRect(0, kDashHeight * kDashFrameCount, kDashWidth,
+                 kSleepingDashHeight);
+  }
+
+  inline QRect DashDestRect() const {
+    return QRect(width() - kDashWidth, (height() - kDashHeight) / 2, kDashWidth,
+                 kDashHeight);
+  }
+
+  inline QRect SleepingDashDestRect() const {
+    return QRect(width() - kDashWidth, (height() - kSleepingDashHeight) / 2,
+                 kDashWidth, kSleepingDashHeight);
+  }
+
+ private:
+  // "constants" that get initialised in the constructor
+  float band_scale_[kRainbowBands];
+  QPen colors_[kRainbowBands];
+
+  QPixmap dash_;
+
+  // For the animation
+  int timer_id_;
+  int frame_;
+
+  // The y positions of each point on the rainbow.
+  float history_[kHistorySize * kRainbowBands];
+
+  // A cache of the last frame's rainbow, so it can be used in the next frame.
+  QPixmap buffer_[2];
+  int current_buffer_;
+
+  // Geometry information that's updated on resize:
+  // The width of the widget minus the space for the pony
+  int available_rainbow_width_;
+
+  // X spacing between each point in the polyline.
+  int px_per_frame_;
+
+  // Amount the buffer_ is shifted to the left (off the edge of the widget) to
+  // make the rainbow extend from 0 to available_rainbow_width_.
+  int x_offset_;
+
+  QBrush background_brush_;
+};
+
+#endif  // RAINBOWDASHANALYZER_H