From 8cc4c24249600392871cc802f3ac4dd27368d335 Mon Sep 17 00:00:00 2001
From: Samuel Fadel <samuelfadel@gmail.com>
Date: Mon, 18 Jan 2016 15:46:05 +0100
Subject: Added observer to update values displayed based on some metric.

* Modified main() function to connect signals/slots to display
  calculated values
* Color scales are no longer shared; they are also normalized to
  each component's own data
* Stub mouse handling in BarChart (changes cursor shape)
---
 projectionobserver.cpp | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 projectionobserver.cpp

(limited to 'projectionobserver.cpp')

diff --git a/projectionobserver.cpp b/projectionobserver.cpp
new file mode 100644
index 0000000..33869a8
--- /dev/null
+++ b/projectionobserver.cpp
@@ -0,0 +1,52 @@
+#include "projectionobserver.h"
+
+#include <cmath>
+
+#include "mp.h"
+
+static void aggregatedError(const arma::mat &distX, const arma::mat &distY, arma::vec &v)
+{
+    double maxX = distX.max();
+    double maxY = distY.max();
+
+    for (arma::uword i = 0; i < v.n_elem; i++) {
+        v[i] = 0;
+        for (arma::uword j = 0; j < v.n_elem; j++) {
+            if (i == j) {
+                continue;
+            }
+
+            v[i] += fabs(distY(i, j) / maxY - distX(i, j) / maxX);
+        }
+    }
+}
+
+ProjectionObserver::ProjectionObserver(const arma::mat &X,
+                                       const arma::uvec &cpIndices)
+    : m_X(X)
+    , m_cpIndices(cpIndices)
+{
+    m_distX = mp::dist(m_X);
+    m_values.set_size(m_X.n_rows);
+}
+
+void ProjectionObserver::setMap(const arma::mat &Y)
+{
+    // update previous map
+    if (m_prevY.n_elem == 0 && m_Y.n_elem > 0) {
+        m_prevY = m_Y;
+        m_distPrevY = m_distY;
+    }
+
+    m_Y = Y;
+    m_distY = mp::dist(Y);
+
+    // method called for the first time; set original Y
+    if (m_origY.n_elem == 0) {
+        m_origY = m_Y;
+        m_distOrigY = m_distY;
+    }
+
+    aggregatedError(m_distX, m_distY, m_values);
+    emit mapChanged(m_values);
+}
-- 
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