1 files changed, 120 insertions, 0 deletions
diff --git a/src/canvastoolthreshold.cc b/src/canvastoolthreshold.cc
new file mode 100644
index 0000000..a321ff2
--- /dev/null
+++ b/src/canvastoolthreshold.cc
@@ -0,0 +1,120 @@
+/* -*- 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));
+}
+