working on collision detection

src/phys_obj.cpp

@@ -1,5 +1,9 @@
 #include "phys_obj.h"
 
+#ifndef PI
+#define PI 3.14159265359
+#endif
+
 phys_obj::phys_obj(Quad object, Vector init_vel) {
   this->obj=object;
   this->velocity=init_vel;
@@ -12,4 +16,47 @@ void phys_obj::force(Vector vec) {
 void phys_obj::render(SDL_Renderer *rend) {
   obj.render(rend);
   bounds.render(rend);
+}
+
+void phys_obj::translate(Vector vec) {
+  obj.translate(vec);
+  bounds.update();
+}
+
+bool phys_obj::checkCollision(phys_obj o) {
+}
+
+void phys_obj::calculate_vectors(std::vector<phys_obj> objects) {
+  for(int i=0; i<objects.size(); i++) {
+    Vector step;
+    int xvel = objects[i].velocity.x;
+    int yvel = objects[i].velocity.y;
+    if(xvel != 0) {
+      if(xvel < 0) {
+        objects[i].velocity.x++;
+        step.x = -1;
+      } else {
+        if(xvel > 0) {
+          objects[i].velocity.x--;
+          step.x = 1;
+        }
+      }
+    }
+    if(yvel != 0) {
+      if(yvel < 0) {
+        objects[i].velocity.y++;
+        step.y = -1;
+      } else {
+        if(yvel > 0) {
+          objects[i].velocity.y--;
+          step.y = 1;
+        }
+      }
+    }
+    objects[i].translate(step);
+    for(int y=0; y<objects.size(); y++) {
+      if(y != i) {
+      }
+    }
+  }
 }

src/phys_obj.h

@@ -1,4 +1,5 @@
 #include "BoundingBox.h"
+#include <vector>
 
 class phys_obj {
   public:
@@ -8,4 +9,7 @@ class phys_obj {
   phys_obj(Quad object, Vector init_vel);
   void force(Vector vec);
   void render(SDL_Renderer *rend);
+  static void calculate_vectors(std::vector<phys_obj> objects);
+  void translate(Vector vec);
+  bool checkCollision(phys_obj o);
 };