ROI to full image and adjust to other ROI

Added new buttons to set the ROI size to full image and adjust it according to other ROI size and positions. When adjusting automatically our best practice hold: tracking ROI > recognition ROI

The new interface looks like:

The automatically determined ROI looks like (tracking was source):

Closes #271 (closed)

include/roiItem.h

@@ -21,11 +21,12 @@
 #ifndef ROIITEM_H
 #define ROIITEM_H
 
+#include "imageItem.h"
+#include "petrack.h"
+
 #include <QGraphicsRectItem>
 #include <QObject>
 
-class Petrack;
-
 class RoiItem : public QObject, public QGraphicsRectItem
 {
     Q_OBJECT
@@ -61,6 +62,51 @@ public:
     void hoverMoveEvent(QGraphicsSceneHoverEvent *event) override;
     void restoreSize();
     void setFixed(bool fixed) { mIsFixed = fixed; }
+    void setToFullImageSize();
+
+    /**
+     * @brief Sets the size and position of the rect relative to other.
+     *
+     * @tparam BinaryFunction
+     * @param other other ROI which is used as source for new position and size
+     * @param defaultHeight default height to determine the cm per pixel
+     * @param f binary function: in this case should be plus or minus
+     */
+    template <typename BinaryFunction>
+    void adjustToOtherROi(const RoiItem &other, float defaultHeight, BinaryFunction f)
+    {
+        if(mIsFixed)
+        {
+            return;
+        }
+        auto otherTopLeft = other.rect().topLeft();
+
+        // Compute head sizes at the four corners to get the offset
+        auto headSizeTopLeft =
+            mMainWindow->getImageItem()->getCmPerPixel(otherTopLeft.x(), otherTopLeft.y(), defaultHeight);
+        auto cmPerPixelTopLeft = (headSizeTopLeft.x() + headSizeTopLeft.y()) / 2.;
+
+        auto headSizeBottomLeft = mMainWindow->getImageItem()->getCmPerPixel(
+            other.rect().bottomLeft().x(), other.rect().bottomLeft().y(), defaultHeight);
+        auto cmPerPixelBottomLeft = (headSizeBottomLeft.x() + headSizeBottomLeft.y()) / 2.;
+
+        auto headSizeTopRight = mMainWindow->getImageItem()->getCmPerPixel(
+            other.rect().topRight().x(), other.rect().topRight().y(), defaultHeight);
+        auto cmPerPixelTopRight = (headSizeTopRight.x() + headSizeTopRight.y()) / 2.;
+
+        auto headSizeBottomRight = mMainWindow->getImageItem()->getCmPerPixel(
+            other.rect().bottomRight().x(), other.rect().bottomRight().y(), defaultHeight);
+        auto cmPerPixelBottomRight = (headSizeBottomRight.x() + headSizeBottomRight.y()) / 2.;
+
+        auto offset =
+            HEAD_SIZE / std::max({cmPerPixelTopLeft, cmPerPixelBottomLeft, cmPerPixelTopRight, cmPerPixelBottomRight});
+
+        auto topLeftX = f(otherTopLeft.x(), -offset);
+        auto topLeftY = f(otherTopLeft.y(), -offset);
+
+        setRect(topLeftX, topLeftY, f(other.rect().width(), 2 * offset), f(other.rect().height(), 2 * offset));
+        emit changed();
+    }
 
 signals:
     void changed();