Starfield

src/display/Display.h

@@ -107,8 +107,8 @@ public:
       return DISPLAY_CHAR_WIDTH;
     }
 
-    void set(Vector *pos, Color color) {
-      set((uint8_t) round(pos->x), (uint8_t) round(pos->y), color);
+    void set(Vector pos, Color color) {
+      set((uint8_t) round(pos.x), (uint8_t) round(pos.y), color);
     }
 
     void set(uint8_t x, uint8_t y, Color color) {

src/display/Vector.h

@@ -11,63 +11,66 @@ public:
 
     double y;
 
+    double length;
+
     Vector() :
-      x(0.0), y(0.0) {
+        x(0.0), y(0.0), length(0.0) {
       // nothing
     }
 
     Vector(double x, double y) :
-      x(x), y(y) {
+        x(x), y(y), length(sqrt(x * x + y * y)) {
       // nothing
     }
 
-    Vector(long degrees, double length) {
+    static Vector polar(long degrees, double length) {
       double radians = (double) degrees * DEG_TO_RAD;
-      x = cos(radians) * length;
-      y = sin(radians) * length;
+      return {
+          cos(radians) * length,
+          sin(radians) * length,
+      };
     }
 
-    Vector *set(Vector that) {
-      this->x = that.x;
-      this->y = that.y;
-      return this;
+    Vector plus(double _x, double _y) const {
+      return {x + _x, y + _y};
     }
 
-    Vector *set(double _x, double _y) {
-      this->x = _x;
-      this->y = _y;
-      return this;
+    Vector plus(Vector vector) const {
+      return {x + vector.x, y + vector.y};
     }
 
-    Vector *add(double _x, double _y) {
-      this->x += _x;
-      this->y += _y;
-      return this;
+    Vector minus(double _x, double _y) const {
+      return {x - _x, y - _y};
     }
 
-    Vector *add(Vector that) {
-      this->x += that.x;
-      this->y += that.y;
-      return this;
+    Vector minus(Vector vector) const {
+      return {x - vector.x, y - vector.y};
     }
 
-    Vector *bounceInBox(uint8_t width, uint8_t height) {
-      while (x < 0 || x >= width) {
-        if (x < 0) {
-          x = -x;
-        } else if (x >= width) {
-          x = 2 * width - x;
+    Vector multiply(double i) const {
+      return {x * i, y * i};
+    }
+
+    Vector bounceInBox(uint8_t width, uint8_t height) const {
+      double x2 = this->x;
+      double y2 = this->y;
+      while (x2 < 0 || x2 >= width) {
+        if (x2 < 0) {
+          x2 = -x2;
+        } else if (x2 >= width) {
+          x2 = 2 * width - x2;
         }
       }
-      while (y < 0 || y >= height) {
-        if (y < 0) {
-          y = -y;
-        } else if (y >= height) {
-          y = 2 * height - y;
+      while (y2 < 0 || y2 >= height) {
+        if (y2 < 0) {
+          y2 = -y2;
+        } else if (y2 >= height) {
+          y2 = 2 * height - y2;
         }
       }
-      return this;
+      return {x2, y2};
     }
+
 };
 
 #endif

src/mode.cpp

@@ -6,6 +6,7 @@
 #include "mode/Pong/Pong.h"
 #include "mode/SpaceInvaders/SpaceInvaders.h"
 #include "mode/NewYear/NewYear.h"
+#include "mode/Starfield/Starfield.h"
 #include "display.h"
 
 ModeId currentModeId = NONE;
@@ -85,6 +86,9 @@ void loadNewMode() {
     case NEW_YEAR:
       mode = new NewYear(&display);
       break;
+    case STARFIELD:
+      mode = new Starfield(&display);
+      break;
     default:
       Serial.print("No mode loaded.\n");
       display.clear();

src/mode/Mode.h

@@ -19,6 +19,7 @@ enum ModeId {
     PONG,
     SPACE_INVADERS,
     NEW_YEAR,
+    STARFIELD,
 };
 
 template<typename T>

src/mode/NewYear/Firework.h

@@ -13,7 +13,7 @@ class Firework {
 
     Display *display{};
 
-    Color color;
+    Color color = MAGENTA;
 
     State state = RISE;
 
@@ -37,7 +37,7 @@ public:
     }
 
     void reset() {
-      position.set((double) random(display->width), display->height);
+      position = Vector((double) random(display->width), display->height);
       color = randomColor();
       state = INITIAL;
 
@@ -93,38 +93,37 @@ public:
     }
 
     void draw() {
-      Vector p;
       switch (state) {
         case INITIAL:
           break;
         case RISE:
-          display->set(&position, YELLOW);
+          display->set(position, YELLOW);
           break;
         case EXPLODE:
-          drawParticle(p, +0.0, +1.0);
-          drawParticle(p, +0.7, +0.7);
-          drawParticle(p, +1.0, +0.0);
-          drawParticle(p, +0.7, -0.7);
-          drawParticle(p, +0.0, -1.0);
-          drawParticle(p, -0.7, -0.7);
-          drawParticle(p, -1.0, +0.0);
-          drawParticle(p, -0.7, +0.7);
+          drawParticle(+0.0, +1.0);
+          drawParticle(+0.7, +0.7);
+          drawParticle(+1.0, +0.0);
+          drawParticle(+0.7, -0.7);
+          drawParticle(+0.0, -1.0);
+          drawParticle(-0.7, -0.7);
+          drawParticle(-1.0, +0.0);
+          drawParticle(-0.7, +0.7);
           break;
         case SPARKLE:
-          if (randomBool(2)) drawParticle(p, +0.0, +1.0);
-          if (randomBool(2)) drawParticle(p, +0.7, +0.7);
-          if (randomBool(2)) drawParticle(p, +1.0, +0.0);
-          if (randomBool(2)) drawParticle(p, +0.7, -0.7);
-          if (randomBool(2)) drawParticle(p, +0.0, -1.0);
-          if (randomBool(2)) drawParticle(p, -0.7, -0.7);
-          if (randomBool(2)) drawParticle(p, -1.0, +0.0);
-          if (randomBool(2)) drawParticle(p, -0.7, +0.7);
+          if (randomBool(2)) drawParticle(+0.0, +1.0);
+          if (randomBool(2)) drawParticle(+0.7, +0.7);
+          if (randomBool(2)) drawParticle(+1.0, +0.0);
+          if (randomBool(2)) drawParticle(+0.7, -0.7);
+          if (randomBool(2)) drawParticle(+0.0, -1.0);
+          if (randomBool(2)) drawParticle(-0.7, -0.7);
+          if (randomBool(2)) drawParticle(-1.0, +0.0);
+          if (randomBool(2)) drawParticle(-0.7, +0.7);
           break;
       }
     }
 
-    void drawParticle(Vector &p, double x, double y) {
-      display->set(p.set(position)->add(x * explosion, y * explosion), color);
+    void drawParticle(double x, double y) {
+      display->set(position.plus(x * explosion, y * explosion), color);
     }
 
     bool isAlive() {

src/mode/Pong/Pong.h

@@ -43,7 +43,7 @@ private:
           }
           break;
         case PLAY:
-          position.add(velocity);
+          position = position.plus(velocity);
           player0.randomMove(display->height);
           player1.randomMove(display->height);
           paddleBounce();
@@ -63,7 +63,7 @@ private:
     }
 
     void topBottomBounce() {
-      position.bounceInBox(display->width, display->height);
+      position = position.bounceInBox(display->width, display->height);
     }
 
     void checkScoring() {
@@ -132,7 +132,7 @@ public:
     explicit Pong(Display *display) :
         Mode(display),
         position(display->width / 2.0, display->height / 2.0),
-        velocity(random(360), exp10(1)) {
+        velocity(Vector::polar(random(360), exp10(1))) {
       instance = this;
       createTimer(100, [](Timer *timer, uint32_t counter, uint32_t currentCount) { instance->tick(timer, counter, currentCount); });
       spawnBall(random(2) == 0 ? -1 : +1);

src/mode/Starfield/Starfield.h

@@ -0,0 +1,46 @@
+#ifndef MEDIATABLE_STARFIELD_H
+#define MEDIATABLE_STARFIELD_H
+
+#include "mode/Mode.h"
+
+#define STAR_COUNT    20
+
+class Starfield : public Mode<Starfield> {
+
+private:
+
+    Vector center;
+
+    Vector stars[STAR_COUNT];
+
+public:
+
+    explicit Starfield(Display *display) :
+        Mode(display),
+        center(display->width / 2.0, display->height / 2.0) {
+      for (auto &star: stars) {
+        star.x = random(display->width);
+        star.y = random(display->height);
+      }
+    }
+
+    const char *getName() override {
+      return "Starfield";
+    }
+
+    void doStep(microseconds_t dt) override {
+      display->clear();
+      for (auto &star: stars) {
+        const Vector velocity = star.minus(center).multiply((double) dt / 200000.0);
+        star = star.plus(velocity);
+        if (star.x < 0 || star.x >= display->width || star.y < 0 || star.y >= display->height) {
+          star = center.plus(Vector::polar(random(360), 1));
+        }
+        uint8_t brightness = (uint8_t) round(255.0 * star.minus(center).length / (display->width / 2.0));
+        display->set(star, gray(brightness));
+      }
+    }
+
+};
+
+#endif

src/server.cpp

@@ -59,6 +59,7 @@ void web_index() {
   server.sendContent(R"(<a href="/mode?mode=7">PONG</a><br>)");
   server.sendContent(R"(<a href="/mode?mode=8">SPACE_INVADERS</a><br>)");
   server.sendContent(R"(<a href="/mode?mode=9">NEW_YEAR</a><br>)");
+  server.sendContent(R"(<a href="/mode?mode=10">STARFIELD</a><br>)");
 
   server.sendContent(R"(Helligkeit: <a href="/brighter">+</a> / <a href="/darker">-</a><br>)");
   server.sendContent(R"(Geschwindigkeit: <a href="/faster">+</a> / <a href="/slower">-</a><br>)");