implement lesson03

LESSONS.md

@@ -44,4 +44,26 @@ Every little snake needs to eat. And no snake will appear without food, which is
 
 Once you're ready, you can _git merge lesson03_.
 
+---
+
+## Lesson 03
+
+#### Prequisites
+- Loops
+
+#### Files
+- _components/Point.cpp_
+- _components/Point.h_
+- _main.cpp_
+
+#### Task
+
+This Task will be a little on the short side. We plan to implement our Snake as a collection of points on the screen and for that, each point should be able to move by itself. This is the objective of this lesson.
+
+1) Some new functions have appeared in _components/Point.*_ which you should inspect and try to implement.
+2) Go to _main.cpp_ and see the new __mainL03__ which will use the movement functions now implemented to make one point move across the screen diagonally. Try it out!
+3) As you can see, we use a for-loop for this but C++ has some other types of loop which you should familiarize yourself with. Try and play around with the commented-out loops and get the same result by using while and do-while loops.
+
+Once you're ready, you can _git merge lesson04_.
+
 ---

components/Point.cpp

@@ -22,6 +22,22 @@ uint32_t Point::getY() const {
     // TODO: implement this getter
 }
 
+void Point::moveUp() {
+    // TODO: implement me
+}
+
+void Point::moveDown() {
+    // TODO: implement me
+}
+
+void Point::moveLeft() {
+    // TODO: implement me
+}
+
+void Point::moveRight() {
+    // TODO: implement me
+}
+
 int Point::getImg() const {
     return img_;
 }

components/Point.h

@@ -16,6 +16,11 @@ public:
     uint32_t getX() const;
     uint32_t getY() const;
 
+    void moveUp();
+    void moveDown();
+    void moveLeft();
+    void moveRight();
+
     int getImg() const;
     void setImg(int image);
 

main.cpp

@@ -32,7 +32,36 @@ void mainL02() {
     std::cout << "Helper QUIT" << std::endl;
 }
 
+void mainL03() {
+    Graphics::get().init("Learners Helper 02");
+
+    Point p(10,10);
+
+    for (uint32_t i = 0; i < 100; i++) {
+        p.moveDown();
+        std::this_thread::sleep_for(std::chrono::milliseconds(100));
+        p.moveRight();
+        std::this_thread::sleep_for(std::chrono::milliseconds(100));
+    }
+
+    /*
+    while(...) {
+        // TODO: play with this
+    }
+    */
+
+    /*
+    do {
+        // TODO: play with this
+    } while (...)
+    */
+
+    Graphics::get().finalize();
+
+    std::cout << "Helper QUIT" << std::endl;
+}
+
 int main() {
-    mainL02();
+    mainL03();
     return 0;
 }