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-rw-r--r--src/canvastoolthreshold.cc120
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diff --git a/src/canvastoolthreshold.cc b/src/canvastoolthreshold.cc
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ * canvastoolthreshold.cc
+ *
+ * Fri Jul 29 16:27:00 CEST 2011
+ * Copyright 2011 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 "canvastoolthreshold.h"
+
+#include <math.h>
+
+#define mapX(x) canvas->mapX(x)
+#define mapY(x) canvas->mapY(x)
+#define unmapX(x) canvas->unmapX(x)
+#define unmapY(x) canvas->unmapY(x)
+
+CanvasToolThreshold::CanvasToolThreshold(Canvas *c)
+{
+ canvas = c;
+ threshold = 0.5;
+ threshold_is_moving = false;
+
+ colThreshold = QColor(255, 127, 127);
+ colThresholdMoving = QColor(180, 0, 0);
+}
+
+bool CanvasToolThreshold::mouseMoveEvent(QMouseEvent *event)
+{
+ if(!isActive()) return false;
+
+ if(event->button() != Qt::LeftButton) {
+ if(abs(event->y() - mapY(threshold)) < 2 ||
+ abs(event->y() - mapY(-threshold)) < 2 ) {
+ canvas->setCursor(Qt::SplitVCursor);
+ return true;
+ }
+ }
+
+ if(threshold_is_moving) {
+ float val = unmapY(event->y());
+ if(fabs(val) > 1.0) val = 1.0;
+ threshold = fabs(val);
+ canvas->update();
+
+ emit thresholdChanging(threshold);
+
+ return true;
+ }
+
+ return false;
+}
+
+bool CanvasToolThreshold::mousePressEvent(QMouseEvent *event)
+{
+ if(!isActive()) return false;
+
+ if(event->button() == Qt::LeftButton) {
+
+ // Check if threshold is being dragged.
+ if(abs(event->y() - mapY(threshold)) < 2 ||
+ abs(event->y() - mapY(-threshold)) < 2 ) {
+ threshold_is_moving = true;
+ canvas->update();
+ return true;
+ }
+ }
+
+ return false;
+}
+
+bool CanvasToolThreshold::mouseReleaseEvent(QMouseEvent *event)
+{
+ if(!isActive()) return false;
+
+ if(event->button() == Qt::LeftButton) {
+ if(threshold_is_moving) {
+ threshold_is_moving = false;
+ canvas->setCursor(Qt::ArrowCursor);
+ canvas->update();
+
+ emit thresholdChanged(threshold);
+
+ return true;
+ }
+ }
+
+ return false;
+}
+
+void CanvasToolThreshold::paintEvent(QPaintEvent *event, QPainter &painter)
+{
+ if(!isActive()) return;
+
+ if(threshold_is_moving) painter.setPen(colThresholdMoving);
+ else painter.setPen(colThreshold);
+ painter.drawLine(event->rect().x(), mapY(threshold),
+ event->rect().x() + event->rect().width(), mapY(threshold));
+ painter.drawLine(event->rect().x(), mapY(-threshold),
+ event->rect().x() + event->rect().width(), mapY(-threshold));
+}
+