Implement visualisation of the labels, if available.

src/fmri/LabelVisualisation.cpp

@@ -0,0 +1,46 @@
+#include <GL/gl.h>
+#include "LabelVisualisation.hpp"
+#include "glutils.hpp"
+
+using namespace fmri;
+
+void LabelVisualisation::draw(float)
+{
+    glPushMatrix();
+    glTranslatef(LAYER_X_OFFSET, 0, 0);
+
+    for (auto i = 0u; i < nodeLabels.size(); ++i) {
+        glPushMatrix();
+        glTranslatef(nodePositions_[3 * i], nodePositions_[3 * i + 1], nodePositions_[3 * i + 2]);
+        if constexpr (alphaEnabled()) {
+            glColor4fv(colorBuffer[i].data());
+        } else {
+            glColor3fv(colorBuffer[i].data());
+        }
+        renderText(nodeLabels[i]);
+        glPopMatrix();
+    }
+
+    glPopMatrix();
+}
+
+LabelVisualisation::LabelVisualisation(const std::vector<float> &positions, const LayerData &prevData,
+                                       const std::vector<std::string> &labels)
+{
+    const auto limit = std::min(prevData.numEntries(), labels.size());
+    const auto maxVal = *std::max_element(prevData.data(), prevData.data() + prevData.numEntries());
+
+    auto nodeInserter = std::back_inserter(nodePositions_);
+
+    for (auto i = 0u; i < limit; ++i) {
+        if (prevData[i] < DISPLAY_LIMIT) {
+            continue;
+        }
+
+        colorBuffer.emplace_back(Color{1 - prevData[i] / maxVal, 1 - prevData[i] / maxVal, 1});
+        std::copy_n(positions.begin() + 3 * i, 3, nodeInserter);
+        nodeLabels.emplace_back(labels[i]);
+    }
+
+    patchTransparancy();
+}