Added TransitionControl and plot rewinding.

New component overlays main view and handles middle clicks/drags
to performing rewinding. Also sports smooth transitioning back to
current projection whenever the mouse button is lifted.

Next up, the same kind of transitions in the displayed values.

1 files changed, 28 insertions, 3 deletions

diff --git a/manipulationhandler.cpp b/manipulationhandler.cpp
index b298860..7d3e3c0 100644
--- a/manipulationhandler.cpp
+++ b/manipulationhandler.cpp
@@ -4,6 +4,8 @@
 #include <iostream>
 #include <numeric>
 
+#include <QDebug>
+
 #include "mp.h"
 #include "numericrange.h"
 
@@ -30,24 +32,47 @@ void ManipulationHandler::setTechnique(ManipulationHandler::Technique technique)
 
 void ManipulationHandler::setCP(const arma::mat &Ys)
 {
+    m_prevY = m_Y;
+
     switch (m_technique) {
     case TECHNIQUE_PLMP:
-        mp::plmp(m_X, m_cpIndices, Ys, m_Y);
+        // TODO?
+        // mp::plmp(m_X, m_cpIndices, Ys, m_Y);
         break;
     case TECHNIQUE_LSP:
-        // TODO
+        // TODO?
         // mp::lsp(m_X, m_cpIndices, Ys, m_Y);
         break;
     case TECHNIQUE_LAMP:
         mp::lamp(m_X, m_cpIndices, Ys, m_Y);
         break;
     case TECHNIQUE_PEKALSKA:
-        // TODO
+        // TODO?
         // mp::pekalska(m_X, m_cpIndices, Ys, m_Y);
         break;
     }
 
+    if (m_firstY.n_rows != m_Y.n_rows) {
+        m_firstY = m_Y;
+    }
+
     emit cpChanged(m_Y.rows(m_cpIndices));
     emit rpChanged(m_Y.rows(m_rpIndices));
     emit mapChanged(m_Y);
 }
+
+void ManipulationHandler::setRewind(double t)
+{
+    if (m_prevY.n_rows != m_Y.n_rows) {
+        return;
+    }
+
+    arma::mat Y = m_Y * t + m_prevY * (1.0 - t);
+    emit cpChanged(Y.rows(m_cpIndices));
+    emit rpChanged(Y.rows(m_rpIndices));
+
+    // NOTE: this signal was supposed to be emitted, but since we don't want
+    // anything besides graphical objects to know the projection is being
+    // rewound, this is (for now) left out.
+    // emit mapChanged(Y);
+}