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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ * canvas.cc
+ *
+ * Tue Nov 10 08:37:37 CET 2009
+ * Copyright 2009 Bent Bisballe Nyeng
+ * deva@aasimon.org
+ ****************************************************************************/
+
+/*
+ * This file is part of DrumGizmo.
+ *
+ * DrumGizmo 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
+ * (at your option) any later version.
+ *
+ * DrumGizmo 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 DrumGizmo; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+#include "canvas.h"
+
+#include <sndfile.h>
+#include <QMouseEvent>
+#include <QPaintEvent>
+#include <QPainter>
+#include <QKeyEvent>
+
+#include <math.h>
+
+#define DEFYSCALE 200
+
+Canvas::Canvas(QWidget *parent)
+ : QWidget(parent)
+{
+ setAttribute(Qt::WA_StaticContents);
+ setMouseTracking(true);
+ setFocusPolicy(Qt::ClickFocus);
+
+ mipmap = NULL;
+
+ data = NULL;
+ size = 0;
+
+ xscale = 1.0;
+ yscale = 1.0;
+ xoffset = 0.0;
+ yoffset = 0.5;
+
+ colBg = QColor(180, 200, 180);
+ colSec = QColor(160, 180, 160);
+ colWavMax = QColor(100, 100, 100);
+ colWavAvg = QColor(0, 0, 0);
+ colMax = QColor(127, 127, 255);
+ colHalf = QColor(180, 180, 255);
+
+ setCursor(Qt::ArrowCursor);
+
+ wav = QImage(width(), height(), QImage::Format_RGB32);
+}
+
+Canvas::~Canvas()
+{
+ if(data) delete[] data;
+ if(mipmap) delete mipmap;
+}
+
+void Canvas::load(QString file)
+{
+ if(data) {
+ delete[] data;
+ data = NULL;
+ size = 0;
+ }
+
+ if(mipmap) {
+ delete mipmap;
+ mipmap = NULL;
+ }
+
+ SF_INFO sf_info;
+ SNDFILE *fh = sf_open(file.toStdString().c_str(), SFM_READ, &sf_info);
+ if(!fh) {
+ printf("Load error...\n");
+ return;
+ }
+
+ size = sf_info.frames;
+
+ printf("Size: %u\n", (unsigned int)sf_info.frames);
+ data = new float[size];
+
+ sf_read_float(fh, data, size);
+
+ sf_close(fh);
+
+ mipmap = new MipMap(data, size);
+
+ updateWav();
+ update();
+}
+
+
+#define SCALEX ((xscale * (float)size/(float)width()) + 0.1)
+#define OFFSETX (xoffset * (float)size)
+float Canvas::mapX(float x)
+{
+ float val = (x - OFFSETX) / SCALEX;
+ return val;
+}
+
+float Canvas::unmapX(float x)
+{
+ float val = x * SCALEX + OFFSETX;
+ return val;
+}
+
+#define SCALEY (yscale * height())
+#define OFFSETY (((float)height() / 2.0) + ((yoffset * 2.0 - 1.0) * SCALEY))
+float Canvas::mapY(float y)
+{
+ float val = OFFSETY + (y * SCALEY);
+ return val;
+}
+
+float Canvas::unmapY(float y)
+{
+ float val = (y - OFFSETY) / SCALEY;
+ return val;
+}
+
+void Canvas::mouseMoveEvent(QMouseEvent *event)
+{
+ for(int i = 0; i < tools.size(); i++) {
+ if(tools[i]->mouseMoveEvent(event)) return;
+ }
+
+ setCursor(Qt::ArrowCursor);
+}
+
+void Canvas::mousePressEvent(QMouseEvent *event)
+{
+ for(int i = 0; i < tools.size(); i++) {
+ if(tools[i]->mousePressEvent(event)) return;
+ }
+}
+
+void Canvas::mouseReleaseEvent(QMouseEvent *event)
+{
+ for(int i = 0; i < tools.size(); i++) {
+ if(tools[i]->mouseReleaseEvent(event)) return;
+ }
+}
+
+void Canvas::resizeEvent(QResizeEvent *event)
+{
+ for(int i = 0; i < tools.size(); i++) {
+ tools[i]->resizeEvent(event);
+ }
+
+ wav = QImage(width(), height(), QImage::Format_RGB32);
+ updateWav();
+ update();
+}
+
+void Canvas::getWavValues(int last, int lx, float *vu, float *vl,
+ float *avgu, float *avgl)
+{
+ if(mipmap == NULL) return;
+
+ MipMapValue val = mipmap->lookup(last, lx);
+
+ *vu = val.max;
+ *vl = val.min;
+ *avgu = val.uavg;
+ *avgl = val.lavg;
+}
+
+void Canvas::updateWav()
+{
+ QPainter painter(&wav);
+
+ painter.setPen(colBg);
+ painter.setBrush(colBg);
+ painter.drawRect(0, 0, wav.width(), wav.height());
+
+ painter.setPen(colSec);
+ int step = 44100;
+ for(size_t i = 0; i < size; i += step) {
+ painter.drawLine(mapX(i), mapY(1.0), mapX(i), mapY(-1.0));
+ }
+
+ painter.setPen(colMax);
+ painter.drawLine(0, mapY(1.0), wav.width(), mapY(1.0));
+ painter.drawLine(0, mapY(-1.0), wav.width(), mapY(-1.0));
+
+ painter.setPen(colHalf);
+ painter.drawLine(0, mapY(0.5), wav.width(), mapY(0.5));
+ painter.drawLine(0, mapY(-0.5), wav.width(), mapY(-0.5));
+
+ if(data) {
+ int last = unmapX(0);
+ for(int x = 0; x < wav.width(); x++) {
+ int lx = unmapX(x);
+ if(lx > (int)size || lx < 0) break;
+ float vu = 0;
+ float vl = 0;
+ float avgu = 0;
+ float avgl = 0;
+
+ getWavValues(last, lx, &vu, &vl, &avgu, &avgl);
+
+ int c = mapY(0.0);
+
+ painter.setPen(colWavMax);
+ painter.drawLine(x, c, x, mapY(vu));
+ painter.drawLine(x, c, x, mapY(vl));
+
+ painter.setPen(colWavAvg);
+ painter.drawLine(x, c, x, mapY(avgu));
+ painter.drawLine(x, c, x, mapY(avgl));
+
+ last = lx;
+ }
+ }
+}
+
+void Canvas::paintEvent(QPaintEvent *event)
+{
+ QPainter painter(this);
+
+ painter.drawImage(event->rect(),wav,event->rect());
+
+ for(int i = 0; i < tools.size(); i++) {
+ tools[i]->paintEvent(event, painter);
+ }
+}
+
+void Canvas::keyReleaseEvent(QKeyEvent *event)
+{
+ for(int i = 0; i < tools.size(); i++) {
+ tools[i]->keyReleaseEvent(event);
+ }
+}
+
+void Canvas::setXScale(float scale)
+{
+ scale = (pow(100.0,scale) / 100.0) - (pow(100.0, 0.0)/ 100.0);
+ if(scale < 0.0) scale = 0.0;
+ if(scale > 1.0) scale = 1.0;
+ xscale = scale;
+ updateWav();
+ update();
+}
+
+void Canvas::setYScale(float scale)
+{
+ yscale = scale;
+ updateWav();
+ update();
+}
+
+void Canvas::setXOffset(float offset)
+{
+ if(offset < 0.0) offset = 0.0;
+ if(offset > 1.0) offset = 1.0;
+ xoffset = offset;
+ updateWav();
+ update();
+}
+
+void Canvas::setYOffset(float offset)
+{
+ if(offset < 0.0) offset = 0.0;
+ if(offset > 1.0) offset = 1.0;
+ yoffset = offset;
+ updateWav();
+ update();
+}
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