tempo-plotter Changeset - 11522eba8b9b · protofusion repositories

Changeset - 11522eba8b9b

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longmem

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Hasan Yavuz ÖZDERYA - 6 years ago 2020-02-18 16:25:04
hy@ozderya.net

modify scrollzoomer so that it tries to maintain zoom window when buffer size changes

3 files changed with 64 insertions and 6 deletions:

src/plot.cpp

src/scrollzoomer.cpp

src/scrollzoomer.h

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src/plot.cpp

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 /*
-  Copyright © 2018 Hasan Yavuz Özderya
+  Copyright © 2020 Hasan Yavuz Özderya
   This file is part of serialplot.
@@ @@ -116,7 +116,7 @@ void Plot::setXAxis(double xMin, double @@
     _xMax = xMax;
     zoomer.setXLimits(xMin, xMax);
-    zoomer.zoom(0); // unzoom
+    zoomer.setZoomBase();
     // set axis
     // setAxisScale(QwtPlot::xBottom, xMin, xMax);

src/scrollzoomer.cpp

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@@ @@ -67,9 +67,26 @@ ScrollZoomer::~ScrollZoomer() @@
 void ScrollZoomer::setXLimits(double min, double max)
+{
     // store current align state to be used when setting zoom base
     if ((zoomRect().right() > xMax) || (abs(zoomRect().right() - xMax) < 0.001))
+    {
         zbAlign = AlignZoomBase::Right;
+    }
     else if (zoomRect().left() < xMin || (zoomRect().left() - xMin < 0.001))
+    {
         zbAlign = AlignZoomBase::Left;
+    }
     else
+    {
         zbAlign = AlignZoomBase::Center;
+    }
     xMin = min;
     xMax = max;
     setZoomBase();
     zbAlign = AlignZoomBase::Center;
     rescale();
+}
 void ScrollZoomer::setHViewSize(double size)
@@ @@ -85,15 +102,49 @@ void ScrollZoomer::setZoomBase(bool doRe @@
     QwtPlotZoomer::setZoomBase(doReplot);
     auto zb = zoomBase();
     auto zs = zoomStack();
     zb.setRight(xMax);
     if ((xMax - xMin) < hViewSize)
     double zbWidth;             // final zoom base width
     if (hViewSize > (xMax - xMin))
+    {
-        zb.setLeft(xMin);
+        zbWidth = xMax - xMin;
+    }
     else
+    {
         zb.setLeft(xMax-hViewSize);
         zbWidth = hViewSize;
+    }
     // TODO: fix snapping, xlimits is already changed we should compare to previous values
     // keep right
     // if (abs(zb.right() - xMax) < 0.001)
     if (zbAlign == AlignZoomBase::Right)
+    {
         zb.setWidth(zbWidth);
         zb.moveRight(xMax);
     } // keep left
     // else if (zb.left() == xMin)
     else if (zbAlign == AlignZoomBase::Left)
+    {
         zb.setWidth(zbWidth);
         zb.moveRight(xMin);
+    }
     else // keep center
+    {
         // resize the zoom base
         double widthDiff = zb.width() - zbWidth;
         zb.setLeft(zb.left() + widthDiff / 2.);
         zb.setRight(zb.right() - widthDiff / 2.);
         // don't let it go out of limits
         if (zb.right() > xMax)
+        {
             zb.moveRight(xMax);
+        }
         else if (zb.left() < xMin)
+        {
             zb.moveLeft(xMin);
+        }
+    }
     zs[0] = zb;
     setZoomStack(zs);
+}

src/scrollzoomer.h

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@@ @@ -67,9 +67,16 @@ private Q_SLOTS: @@
     void scrollBarMoved( Qt::Orientation o, double min, double max );
 private:
     enum class AlignZoomBase
+    {
         Right, Center, Left
     };
     QRectF d_limits;
     double xMin, xMax;
     double hViewSize;
     /// used for aligning zoom base during xlimits change
     AlignZoomBase zbAlign;
     bool needScrollBar( Qt::Orientation ) const;
     int oppositeAxis( int ) const;

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