add cancelAnimations() function

refs #34

include/llmr/map/transform.hpp

@@ -19,6 +19,7 @@ public:
     // Animations
     bool needsAnimation() const;
     void updateAnimations();
+    void cancelAnimations();
 
     // Relative changes
     void moveBy(double dx, double dy);

src/map/transform.cpp

@@ -28,6 +28,10 @@ void Transform::updateAnimations() {
     });
 }
 
+void Transform::cancelAnimations() {
+    animations.clear();
+}
+
 void Transform::moveBy(double dx, double dy) {
     x += cos(angle) * dx + sin(angle) * dy;
     y += cos(angle) * dy + sin(-angle) * dx;