Unify interpolation function.

src/fmri/ActivityAnimation.cpp

@@ -51,17 +51,13 @@ ActivityAnimation::ActivityAnimation(
 
 void ActivityAnimation::draw(float timeScale)
 {
-    std::unique_ptr<float[]> vertexBuffer(new float[bufferLength]);
-    caffe::caffe_copy(bufferLength, delta.data(), vertexBuffer.get());
-    caffe::caffe_scal(bufferLength, timeScale, vertexBuffer.get());
-    caffe::caffe_add(bufferLength, startingPos.data(), vertexBuffer.get(), vertexBuffer.get());
-
+    const auto vertexBuffer = animate(startingPos, delta, timeScale);
     glPointSize(5);
 
     glEnableClientState(GL_VERTEX_ARRAY);
     glEnableClientState(GL_COLOR_ARRAY);
     glColorPointer(3, GL_FLOAT, 0, colorBuf.data());
-    glVertexPointer(3, GL_FLOAT, 0, vertexBuffer.get());
+    glVertexPointer(3, GL_FLOAT, 0, vertexBuffer.data());
     glDrawArrays(GL_POINTS, 0, bufferLength / 3);
     glDisableClientState(GL_COLOR_ARRAY);
     glDisableClientState(GL_VERTEX_ARRAY);

src/fmri/ImageInteractionAnimation.cpp

@@ -8,9 +8,7 @@ using namespace fmri;
 
 void ImageInteractionAnimation::draw(float step)
 {
-    auto vertexBuffer = deltas;
-    caffe::caffe_scal(deltas.size(), step, vertexBuffer.data());
-    caffe::caffe_add(vertexBuffer.size(), vertexBuffer.data(), startingPositions.data(), vertexBuffer.data());
+    auto vertexBuffer = animate(startingPositions, deltas, step);
 
     drawImageTiles(vertexBuffer.size() / 3, vertexBuffer.data(), textureCoordinates.data(), texture);
 }

src/fmri/PoolingLayerAnimation.cpp

@@ -30,9 +30,7 @@ PoolingLayerAnimation::PoolingLayerAnimation(const LayerData &prevData, const La
 
 void PoolingLayerAnimation::draw(float timeStep)
 {
-    vector<float> vertexBuffer(deltas);
-    caffe::caffe_scal(vertexBuffer.size(), timeStep, vertexBuffer.data());
-    caffe::caffe_add(startingPositions.size(), startingPositions.data(), vertexBuffer.data(), vertexBuffer.data());
+    auto vertexBuffer = animate(startingPositions, deltas, timeStep);
 
     drawImageTiles(vertexBuffer.size() / 3, vertexBuffer.data(), textureCoordinates.data(), original);
 }

src/fmri/utils.cpp

@@ -1,3 +1,4 @@
+#include <caffe/util/math_functions.hpp>
 #include "utils.hpp"
 
 const float fmri::LAYER_X_OFFSET = -10;
@@ -14,3 +15,12 @@ std::default_random_engine &fmri::rng()
 
     return rng;
 }
+
+std::vector<float> fmri::animate(const std::vector<float> &start, const std::vector<float> &delta, float time)
+{
+    auto vertexBuffer = delta;
+    caffe::caffe_scal(vertexBuffer.size(), time, vertexBuffer.data());
+    caffe::caffe_add(start.size(), vertexBuffer.data(), start.data(), vertexBuffer.data());
+
+    return vertexBuffer;
+}

src/fmri/utils.hpp

@@ -229,4 +229,14 @@ namespace fmri
             }
         }
     }
+
+    /**
+     * Animate a list of floats.
+     *
+     * @param start Starting values for all floats
+     * @param delta Value to be added at the end of the animation
+     * @param time 0..1 where in the animation are we?
+     * @return Resulting list of floats.
+     */
+    std::vector<float> animate(const std::vector<float>& start, const std::vector<float>& delta, float time);
 }