2011-06-23 01:25:08 +02:00
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/* This file is part of Clementine.
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Copyright 2010, David Sansome <me@davidsansome.com>
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Clementine is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Clementine is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Clementine. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "nyancatanalyzer.h"
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#include "core/logging.h"
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2011-06-23 02:22:56 +02:00
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#include <cmath>
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2011-06-23 01:25:08 +02:00
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#include <QTimerEvent>
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2011-06-23 15:21:08 +02:00
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#include <QBrush>
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2011-06-23 01:25:08 +02:00
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2011-07-20 21:33:11 +02:00
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const char* NyanCatAnalyzer::kName = "Nyanalyzer cat";
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2011-06-23 17:14:39 +02:00
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const float NyanCatAnalyzer::kPixelScale = 0.02f;
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2011-06-23 01:25:08 +02:00
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NyanCatAnalyzer::NyanCatAnalyzer(QWidget* parent)
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: Analyzer::Base(parent, 9),
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cat_(":/nyancat.png"),
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timer_id_(startTimer(kFrameIntervalMs)),
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2011-06-23 15:21:08 +02:00
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frame_(0),
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2011-12-01 18:29:27 +01:00
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current_buffer_(0),
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2011-06-24 00:49:33 +02:00
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available_rainbow_width_(0),
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px_per_frame_(0),
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x_offset_(0),
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background_brush_(QColor(0x0f, 0x43, 0x73))
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2011-06-23 01:25:08 +02:00
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{
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memset(history_, 0, sizeof(history_));
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for (int i=0 ; i<kRainbowBands ; ++i) {
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2011-06-23 22:36:38 +02:00
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colors_[i] = QPen(QColor::fromHsv(i * 255 / kRainbowBands, 255, 255),
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kCatHeight/kRainbowBands,
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Qt::SolidLine, Qt::FlatCap);
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2011-06-23 22:36:30 +02:00
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// pow constants computed so that
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// | band_scale(0) | ~= .5 and | band_scale(5) | ~= 32
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band_scale_[i] = -std::cos(M_PI * i / (kRainbowBands-1)) * 0.5 * std::pow(2.3, i);
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2011-06-23 01:25:08 +02:00
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}
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}
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void NyanCatAnalyzer::transform(Scope& s) {
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m_fht->spectrum(&s.front());
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}
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void NyanCatAnalyzer::timerEvent(QTimerEvent* e) {
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if (e->timerId() == timer_id_) {
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frame_ = (frame_ + 1) % kCatFrameCount;
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} else {
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Analyzer::Base::timerEvent(e);
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}
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}
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2011-06-23 22:36:38 +02:00
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void NyanCatAnalyzer::resizeEvent(QResizeEvent* e) {
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// Invalidate the buffer so it's recreated from scratch in the next paint
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// event.
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buffer_[0] = QPixmap();
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buffer_[1] = QPixmap();
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2011-06-24 00:49:33 +02:00
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available_rainbow_width_ = width() - kCatWidth + kRainbowOverlap;
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px_per_frame_ = float(available_rainbow_width_) / (kHistorySize-1) + 1;
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x_offset_ = px_per_frame_ * (kHistorySize-1) - available_rainbow_width_;
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}
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2011-06-23 22:36:14 +02:00
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void NyanCatAnalyzer::analyze(QPainter& p, const Analyzer::Scope& s, bool new_frame) {
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2011-06-23 01:25:08 +02:00
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// Discard the second half of the transform
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const int scope_size = s.size() / 2;
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2011-06-23 22:36:14 +02:00
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if (new_frame) {
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// Transform the music into rainbows!
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for (int band=0 ; band<kRainbowBands ; ++band) {
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float* band_start = history_ + band * kHistorySize;
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2011-06-23 01:25:08 +02:00
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2011-06-23 22:36:14 +02:00
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// Move the history of each band across by 1 frame.
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memmove(band_start, band_start + 1, (kHistorySize - 1) * sizeof(float));
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}
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2011-06-23 01:25:08 +02:00
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2011-06-23 22:36:14 +02:00
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// Now accumulate the scope data into each band. Should maybe use a series
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// of band pass filters for this, so bands can leak into neighbouring bands,
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// but for now it's a series of separate square filters.
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const int samples_per_band = scope_size / kRainbowBands;
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int sample = 0;
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for (int band=0 ; band<kRainbowBands ; ++band) {
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float accumulator = 0.0;
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for (int i=0 ; i<samples_per_band ; ++i) {
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accumulator += s[sample++];
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}
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history_[(band+1) * kHistorySize - 1] = accumulator * band_scale_[band];
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2011-06-23 01:25:08 +02:00
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}
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2011-06-24 00:49:33 +02:00
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// Create polylines for the rainbows.
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QPointF polyline[kRainbowBands * kHistorySize];
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QPointF* dest = polyline;
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float* source = history_;
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const float top_of_cat = float(height())/2 - float(kCatHeight)/2;
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for (int band=0 ; band<kRainbowBands ; ++band) {
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// Calculate the Y position of this band.
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const float y = float(kCatHeight) / (kRainbowBands + 1) * (band + 0.5) + top_of_cat;
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// Add each point in the line.
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for (int x=0 ; x<kHistorySize; ++x) {
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*dest = QPointF(px_per_frame_ * x, y + *source * kPixelScale);
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++ dest;
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++ source;
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}
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2011-06-23 01:25:08 +02:00
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}
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2011-06-24 00:49:33 +02:00
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// Do we have to draw the whole rainbow into the buffer?
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2011-12-01 18:29:27 +01:00
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if (buffer_[0].isNull()) {
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for (int i=0 ; i<2 ; ++i) {
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buffer_[i] = QPixmap(QSize(width() + x_offset_, height()));
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buffer_[i].fill(background_brush_.color());
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}
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current_buffer_ = 0;
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2011-06-23 15:21:08 +02:00
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2011-12-01 18:29:27 +01:00
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QPainter buffer_painter(&buffer_[0]);
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2011-06-24 00:49:33 +02:00
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buffer_painter.setRenderHint(QPainter::Antialiasing);
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for (int band=kRainbowBands-1 ; band>=0 ; --band) {
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buffer_painter.setPen(colors_[band]);
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buffer_painter.drawPolyline(&polyline[band*kHistorySize], kHistorySize);
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}
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} else {
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2011-12-01 18:29:27 +01:00
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const int last_buffer = current_buffer_;
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current_buffer_ = (current_buffer_ + 1) % 2;
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2011-06-24 00:49:33 +02:00
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// We can just shuffle the buffer along a bit and draw the new frame's data.
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2011-12-01 18:29:27 +01:00
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QPainter buffer_painter(&buffer_[current_buffer_]);
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2011-06-24 00:49:33 +02:00
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buffer_painter.setRenderHint(QPainter::Antialiasing);
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2011-12-01 18:29:27 +01:00
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buffer_painter.drawPixmap(0, 0, buffer_[last_buffer],
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2011-06-24 00:49:33 +02:00
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px_per_frame_, 0,
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x_offset_ + available_rainbow_width_ - px_per_frame_, 0);
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buffer_painter.fillRect(x_offset_ + available_rainbow_width_ - px_per_frame_, 0,
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kCatWidth - kRainbowOverlap + px_per_frame_, height(),
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background_brush_);
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for (int band=kRainbowBands-1 ; band>=0 ; --band) {
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buffer_painter.setPen(colors_[band]);
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buffer_painter.drawPolyline(&polyline[(band+1)*kHistorySize - 2], 2);
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}
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2011-06-23 22:36:38 +02:00
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}
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2011-06-23 01:25:08 +02:00
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}
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2011-06-23 22:36:38 +02:00
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// Draw the buffer on to the widget
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2011-12-01 18:29:27 +01:00
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p.drawPixmap(0, 0, buffer_[current_buffer_], x_offset_, 0, 0, 0);
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2011-06-23 22:36:38 +02:00
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2011-06-24 00:49:33 +02:00
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// Draw nyan cat (he's been waiting for this for 75 lines).
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2011-06-23 01:25:08 +02:00
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// Nyan nyan nyan nyan.
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QRect cat_dest(width() - kCatWidth, (height() - kCatHeight) / 2,
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kCatWidth, kCatHeight);
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p.drawPixmap(cat_dest, cat_, CatSourceRect());
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}
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