1 files changed, 40 insertions, 0 deletions
diff --git a/src/managers/input/trackpad/gestures/ITrackpadGesture.cpp b/src/managers/input/trackpad/gestures/ITrackpadGesture.cpp
new file mode 100644
index 00000000..afc96627
--- /dev/null
+++ b/src/managers/input/trackpad/gestures/ITrackpadGesture.cpp
@@ -0,0 +1,40 @@
+#include "ITrackpadGesture.hpp"
+
+// scale the pinch "scale" to match our imaginary delta units
+constexpr const float PINCH_DELTA_SCALE         = 400.F;
+constexpr const float PINCH_DELTA_SCALE_OUT_ADD = 1.6F;
+
+//
+void ITrackpadGesture::begin(const STrackpadGestureBegin& e) {
+    m_lastPinchScale = 1.F;
+    m_scale          = e.scale;
+}
+
+float ITrackpadGesture::distance(const STrackpadGestureBegin& e) {
+    if (e.direction == TRACKPAD_GESTURE_DIR_LEFT || e.direction == TRACKPAD_GESTURE_DIR_RIGHT || e.direction == TRACKPAD_GESTURE_DIR_HORIZONTAL)
+        return m_scale * (e.direction == TRACKPAD_GESTURE_DIR_LEFT ? -e.swipe->delta.x : e.swipe->delta.x);
+    if (e.direction == TRACKPAD_GESTURE_DIR_UP || e.direction == TRACKPAD_GESTURE_DIR_DOWN || e.direction == TRACKPAD_GESTURE_DIR_VERTICAL)
+        return m_scale * (e.direction == TRACKPAD_GESTURE_DIR_UP ? -e.swipe->delta.y : e.swipe->delta.y);
+    if (e.direction == TRACKPAD_GESTURE_DIR_SWIPE)
+        return m_scale * (e.swipe->delta.size());
+    if (e.direction == TRACKPAD_GESTURE_DIR_PINCH || e.direction == TRACKPAD_GESTURE_DIR_PINCH_IN || e.direction == TRACKPAD_GESTURE_DIR_PINCH_OUT) {
+        const auto Δ     = m_lastPinchScale - e.pinch->scale;
+        m_lastPinchScale = e.pinch->scale;
+        return m_scale * ((e.direction == TRACKPAD_GESTURE_DIR_PINCH_IN ? -Δ : Δ * PINCH_DELTA_SCALE_OUT_ADD) * PINCH_DELTA_SCALE);
+    }
+
+    return m_scale * (e.swipe ? e.swipe->delta.size() : e.pinch->delta.size());
+}
+
+float ITrackpadGesture::distance(const STrackpadGestureUpdate& e) {
+    return ITrackpadGesture::distance(STrackpadGestureBegin{
+        .swipe     = e.swipe,
+        .pinch     = e.pinch,
+        .direction = e.direction,
+        .scale     = e.scale,
+    });
+}
+
+bool ITrackpadGesture::isDirectionSensitive() {
+    return false;
+}