Added fitting, fixed roi etc (#129)

Co-authored-by: Patrick <patrick.sieberer@psi.ch>
Co-authored-by: JulianHeymes <julian.heymes@psi.ch>

src/utils/task.cpp

@@ -0,0 +1,30 @@
+#include "aare/utils/task.hpp"
+
+namespace aare {
+
+std::vector<std::pair<int, int>> split_task(int first, int last,
+                                            int n_threads) {
+    std::vector<std::pair<int, int>> vec;
+    vec.reserve(n_threads);
+
+    int n_frames = last - first;
+
+    if (n_threads >= n_frames) {
+        for (int i = 0; i != n_frames; ++i) {
+            vec.push_back({i, i + 1});
+        }
+        return vec;
+    }
+
+    int step = (n_frames) / n_threads;
+    for (int i = 0; i != n_threads; ++i) {
+        int start = step * i;
+        int stop = step * (i + 1);
+        if (i == n_threads - 1)
+            stop = last;
+        vec.push_back({start, stop});
+    }
+    return vec;
+}
+
+} // namespace aare

src/utils/task.test.cpp

@@ -0,0 +1,32 @@
+#include "aare/utils/task.hpp"
+
+#include <catch2/matchers/catch_matchers_floating_point.hpp>
+#include <catch2/catch_test_macros.hpp>
+
+
+TEST_CASE("Split a range into multiple tasks"){    
+
+    auto tasks = aare::split_task(0, 10, 3);
+    REQUIRE(tasks.size() == 3);
+    REQUIRE(tasks[0].first == 0);
+    REQUIRE(tasks[0].second == 3);
+    REQUIRE(tasks[1].first == 3);
+    REQUIRE(tasks[1].second == 6);
+    REQUIRE(tasks[2].first == 6);
+    REQUIRE(tasks[2].second == 10);
+
+    tasks = aare::split_task(0, 10, 1);
+    REQUIRE(tasks.size() == 1);
+    REQUIRE(tasks[0].first == 0);
+    REQUIRE(tasks[0].second == 10);
+
+    tasks = aare::split_task(0, 10, 10);
+    REQUIRE(tasks.size() == 10);
+    for (int i = 0; i < 10; i++){
+        REQUIRE(tasks[i].first == i);
+        REQUIRE(tasks[i].second == i+1);
+    }
+    
+
+
+}