1 files changed, 22 insertions, 1 deletions
diff --git a/2d/_collisions/polygon_polygon/main.cpp b/2d/_collisions/polygon_polygon/main.cpp
index e85cc25..620edaa 100644
--- a/2d/_collisions/polygon_polygon/main.cpp
+++ b/2d/_collisions/polygon_polygon/main.cpp
@@ -11,6 +11,8 @@
 #include <cmath>
 #include <cfloat>
 
+float32 gravityDirection = -1;
+
 struct Impulse {
     Vector2 force = { 0, 0 };
     float32 timeOfApplicationSeconds = 0.25f;
@@ -52,7 +54,7 @@ struct Rigidbody {
     }
 
     void applyGravity(float32 deltaTimeSeconds) {
-        velocity += (Vector2 { 0.f, -9.8f } * deltaTimeSeconds);
+        velocity += (Vector2 { 0.f, gravityDirection * 100.f } * deltaTimeSeconds);
     }
 
     void update(float32 deltaTimeSeconds) {
@@ -204,6 +206,7 @@ struct ConvexPolygon {
 
 EM_BOOL onPlayClicked(int eventType, const EmscriptenMouseEvent* mouseEvent, void* userData);
 EM_BOOL onStopClicked(int eventType, const EmscriptenMouseEvent* mouseEvent, void* userData);
+EM_BOOL onGravityReversed(int eventType, const EmscriptenMouseEvent* mouseEvent, void* userData);;
 
 void load();
 void update(float32 time, void* userData);
@@ -218,6 +221,7 @@ int main() {
 	context.init("#gl_canvas");
     emscripten_set_click_callback("#gl_canvas_play", NULL, false, onPlayClicked);
     emscripten_set_click_callback("#gl_canvas_stop", NULL, false, onStopClicked);
+    emscripten_set_click_callback("#reverse_gravity", NULL, false, onGravityReversed);
     return 0;
 }
 
@@ -269,12 +273,19 @@ struct SATResult {
 
 struct ProjectionResult {
     Vector2 minVertex;
+    Vector2 minAdjacent1;
+    Vector2 minAdjacent2;
+
     Vector2 maxVertex;
+    Vector2 maxAdjacent1;
+    Vector2 maxAdjacent2;
     Vector2 projection;
 };
 
 ProjectionResult getProjection(Vector2* vertices, int numVertices, Vector2 axis) {
     ProjectionResult pr;
+    pr.minVertex = vertices[0];
+    pr.maxVertex = vertices[0];
 	float32 min = axis.dot(vertices[0]);
 	float32 max = min;
 
@@ -334,6 +345,10 @@ bool runSatForShapesEdges(SATResult* result, ConvexPolygon* first, ConvexPolygon
             } else {
                 result->overlapPoint = secondProj.maxVertex;
             }
+
+            // Check if the normal from one of the edges of the overlap point is nearly perpendicular
+            // to the edge that you have intersected with. If so, let's call the point of intersection
+            // the middle of the edge.
 		}
 	}
 
@@ -497,3 +512,9 @@ EM_BOOL onStopClicked(int eventType, const EmscriptenMouseEvent* mouseEvent, voi
     unload();
     return true;
 }
+
+EM_BOOL onGravityReversed(int eventType, const EmscriptenMouseEvent* mouseEvent, void* userData) {
+    printf("Reversing gravity\n");
+    gravityDirection = -gravityDirection;
+    return true;
+}