tempo-plotter Changeset - a710fe7af2f0 · protofusion repositories

Changeset - a710fe7af2f0

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Hasan Yavuz ÖZDERYA - 10 years ago 2015-11-07 16:27:54
hy@ozderya.net

added snapping for scale zoom picker

2 files changed with 39 insertions and 8 deletions:

scalepicker.cpp

scalepicker.h

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scalepicker.cpp

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 /*
   Copyright © 2015 Hasan Yavuz Özderya
   This file is part of serialplot.
   serialplot 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.
   serialplot 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 serialplot.  If not, see <http://www.gnu.org/licenses/>.
 */
 #include <QEvent>
 #include <QMouseEvent>
 #include <QPainter>
 #include <qwt_scale_widget.h>
 #include <qwt_scale_map.h>
 #include <qwt_scale_div.h>
 #include <math.h>
 #include "scalepicker.h"
 // minimum size for pick (in pixels)
 #define MIN_PICK_SIZE (2)
 #define SNAP_DISTANCE (5)
 class PlotOverlay : public QwtWidgetOverlay
+{
 public:
     PlotOverlay(QWidget* widget, ScalePicker* picker);
 protected:
     virtual void drawOverlay(QPainter*) const;
 private:
     ScalePicker* _picker;
 };
 PlotOverlay::PlotOverlay(QWidget* widget, ScalePicker* picker) :
     QwtWidgetOverlay(widget)
+{
     _picker = picker;
+}
 void PlotOverlay::drawOverlay(QPainter* painter) const
+{
     _picker->drawPlotOverlay(painter);
+}
 class ScaleOverlay : public QwtWidgetOverlay
+{
 public:
     ScaleOverlay(QWidget* widget, ScalePicker* picker);
 protected:
     virtual void drawOverlay(QPainter*) const;
 private:
     ScalePicker* _picker;
 };
 ScaleOverlay::ScaleOverlay(QWidget* widget, ScalePicker* picker) :
     QwtWidgetOverlay(widget)
+{
     _picker = picker;
+}
 void ScaleOverlay::drawOverlay(QPainter* painter) const
+{
     _picker->drawScaleOverlay(painter);
+}
 ScalePicker::ScalePicker(QwtScaleWidget* scaleWidget, QWidget* canvas) :
     QObject(scaleWidget)
+{
     _scaleWidget = scaleWidget;
     _canvas = canvas;
     scaleWidget->installEventFilter(this);
     scaleWidget->setMouseTracking(true);
     pickerOverlay = new PlotOverlay(canvas, this);
     scaleOverlay = new ScaleOverlay(scaleWidget, this);
     started = false;
     pressed = false;
+}
 bool ScalePicker::eventFilter(QObject* object, QEvent* event)
+{
     if (event->type() == QEvent::MouseButtonPress ||
         event->type() == QEvent::MouseButtonRelease ||
         event->type() == QEvent::MouseMove)
+    {
         updateSnapPoints();
         QMouseEvent* mouseEvent = (QMouseEvent*) event;
         double pos = this->position(mouseEvent);
         double posPx = this->positionPx(mouseEvent);
         // do snapping
         for (double sp : snapPoints)
+        {
             if (fabs(posPx-sp) <= SNAP_DISTANCE)
+            {
                 posPx = sp;
                 break;
+            }
+        }
         double pos = this->position(posPx);
         currentPosPx = posPx;
         if (event->type() == QEvent::MouseButtonPress &&
             mouseEvent->button() == Qt::LeftButton)
+        {
             pressed = true; // not yet started
             firstPos = pos;
             firstPosPx = posPx;
+        }
         else if (event->type() == QEvent::MouseMove)
+        {
             // make sure pick size is big enough, so that just
             // clicking won't trigger pick
             if (!started && pressed && (fabs(posPx-firstPosPx) > MIN_PICK_SIZE))
+            {
                 started = true;
                 emit pickStarted(pos);
+            }
             else if (started)
+            {
                 pickerOverlay->updateOverlay();
                 emit picking(firstPos, pos);
+            }
             scaleOverlay->updateOverlay();
+        }
         else // event->type() == QEvent::MouseButtonRelease
+        {
             pressed = false;
             if (started)
+            {
                 // finalize
                 started = false;
                 emit picked(firstPos, pos);
+            }
+        }
         return true;
+    }
     else if (event->type() == QEvent::Leave)
+    {
         scaleOverlay->updateOverlay();
         return true;
+    }
     else
+    {
         return QObject::eventFilter(object, event);
+    }
+}
@@ @@ -159,92 +175,102 @@ void ScalePicker::drawPlotOverlay(QPaint @@
             int height = painter->device()->height();
             rect = QRect(posCanvasPx(firstPosPx), 0, currentPosPx-firstPosPx, height);
+        }
         else // vertical
+        {
             int width = painter->device()->width();
             rect = QRect(0, posCanvasPx(firstPosPx), width, currentPosPx-firstPosPx);
+        }
         painter->drawRect(rect);
         painter->restore();
+    }
+}
 void ScalePicker::drawScaleOverlay(QPainter* painter)
+{
     painter->save();
     painter->setPen(_pen);
     if (1)
+    {
         if (_scaleWidget->alignment() == QwtScaleDraw::BottomScale ||
             _scaleWidget->alignment() == QwtScaleDraw::TopScale)
+        {
             int height = painter->device()->height();
             if (started) painter->drawLine(firstPosPx, 0, firstPosPx, height);
             if (started || _scaleWidget->underMouse())
+            {
                 painter->drawLine(currentPosPx, 0, currentPosPx, height);
+            }
+        }
         else // vertical
+        {
             int width = painter->device()->width();
             if (started) painter->drawLine(0, firstPosPx, width, firstPosPx);
             if (started || _scaleWidget->underMouse())
+            {
                 painter->drawLine(0, currentPosPx, width, currentPosPx);
+            }
+        }
+    }
     painter->restore();
+}
 void ScalePicker::setPen(QPen pen)
+{
     _pen = pen;
+}
 double ScalePicker::position(QMouseEvent* mouseEvent)
 // convert the position of the click to the plot coordinates
 double ScalePicker::position(double posPx)
+{
     double pos;
     pos = positionPx(mouseEvent);
     // convert the position of the click to the plot coordinates
     pos = _scaleWidget->scaleDraw()->scaleMap().invTransform(pos);
     return pos;
     return _scaleWidget->scaleDraw()->scaleMap().invTransform(posPx);
+}
 double ScalePicker::positionPx(QMouseEvent* mouseEvent)
+{
     double pos;
     if (_scaleWidget->alignment() == QwtScaleDraw::BottomScale ||
         _scaleWidget->alignment() == QwtScaleDraw::TopScale)
+    {
         pos = mouseEvent->pos().x();
+    }
     else // left or right scale
+    {
         pos = mouseEvent->pos().y();
+    }
     return pos;
+}
 /*
  * Scale widget and canvas widget is not always aligned. Especially
  * when zooming scaleWidget moves around. This causes irregularities
  * when drawing the tracker lines. This function maps scale widgets
  * pixel coordinate to canvas' coordinate.
  */
 double ScalePicker::posCanvasPx(double pos)
+{
     // assumption: scale.width < canvas.width && scale.x > canvas.x
     if (_scaleWidget->alignment() == QwtScaleDraw::BottomScale ||
         _scaleWidget->alignment() == QwtScaleDraw::TopScale)
+    {
         return pos + (_scaleWidget->x() - _canvas->x());
+    }
     else // left or right scale
+    {
         return pos + (_scaleWidget->y() - _canvas->y());
+    }
     return pos;
+}
 void ScalePicker::updateSnapPoints()
+{
     auto allTicks = _scaleWidget->scaleDraw()->scaleDiv().ticks(QwtScaleDiv::MajorTick) +
         _scaleWidget->scaleDraw()->scaleDiv().ticks(QwtScaleDiv::MediumTick) +
         _scaleWidget->scaleDraw()->scaleDiv().ticks(QwtScaleDiv::MinorTick);
     snapPoints.clear();
     for(auto t : allTicks)
+    {
         snapPoints << _scaleWidget->scaleDraw()->scaleMap().transform(t);
+    }
+}

scalepicker.h

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Show inline comments

 /*
   Copyright © 2015 Hasan Yavuz Özderya
   This file is part of serialplot.
   serialplot 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.
   serialplot 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 serialplot.  If not, see <http://www.gnu.org/licenses/>.
 */
 #ifndef SCALEPICKER_H
 #define SCALEPICKER_H
 #include <QObject>
 #include <QMouseEvent>
 #include <QPen>
 #include <QWidget>
 #include <QList>
 #include <qwt_scale_widget.h>
 #include <qwt_widget_overlay.h>
 class ScalePicker : public QObject
+{
     Q_OBJECT
 public:
     ScalePicker(QwtScaleWidget* scaleWidget, QWidget* canvas);
     virtual bool eventFilter(QObject*, QEvent*);
     void drawPlotOverlay(QPainter*); // called from ScalePickerOverlay
     void drawScaleOverlay(QPainter*); // called from ScaleOverlay
     void setPen(QPen pen);
 signals:
     void pickStarted(double pos);
     void picking(double firstPos, double lastPos);
     void picked(double firstPos, double lastPos);
 private:
     QwtScaleWidget* _scaleWidget;
     QWidget* _canvas;
     QwtWidgetOverlay* pickerOverlay; // will be PlotOverlay
     QwtWidgetOverlay* scaleOverlay;  // will be ScaleOverlay
     QPen _pen;
     bool pressed;
     bool started;
     double firstPos; // converted to plot coordinates
     double firstPosPx; // pixel coordinates
     double currentPosPx; // current position in pixel coordinates
     QList<double> snapPoints;
-    double position(QMouseEvent*); // returns the axis mouse position relative to plot coordinates
+    double position(double); // returns the axis mouse position relative to plot coordinates
     double positionPx(QMouseEvent*); // returns the axis mouse position in pixels
     double posCanvasPx(double pos); // returns the given position in canvas coordinates
 private slots:
     void updateSnapPoints();
 };
 #endif // SCALEPICKER_H

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