WIP Starfield moving center

src/mode/Starfield/Starfield.h

@@ -9,13 +9,16 @@ private:
 
     Vector center;
 
+    Vector centerNext;
+
     Vector stars[20];
 
 public:
 
     explicit Starfield(Display &display) :
         Mode(display),
-        center(width / 2.0, height / 2.0) {
+        center(width / 2.0, height / 2.0),
+        centerNext(center.x, center.y) {
       for (auto &star: stars) {
         star.x = random(width);
         star.y = random(height);
@@ -29,6 +32,7 @@ public:
 protected:
 
     void step(microseconds_t microseconds) override {
+      stepCenter();
       for (auto &star: stars) {
         const Vector velocity = star.minus(center).multiply((double) microseconds / 200000.0);
         star = star.plus(velocity);
@@ -41,6 +45,25 @@ protected:
       markDirty();
     }
 
+    void stepCenter() {
+      // TODO moving center overtakes moving stars (less stars in direction of moving center)
+//      Vector diff = centerNext.minus(center);
+//      if (diff.length < 0.01) {
+//        centerNext = Vector(random(width), random(height));
+//      } else {
+//        if (diff.x >= 0) {
+//          center.x += min(0.1, diff.x);
+//        } else {
+//          center.x += max(-0.1, diff.x);
+//        }
+//        if (diff.y >= 0) {
+//          center.y += min(0.1, diff.y);
+//        } else {
+//          center.y += max(-0.1, diff.y);
+//        }
+//      }
+    }
+
     void draw(Display &display) override {
       display.clear();
       for (auto &star: stars) {