added object remove_listener so that you can get a message if some objects are remove...

[supertux.git] / lib / special / collision.cpp

diff --git a/lib/special/collision.cpp b/lib/special/collision.cpp
index b0cb229..46ed0bf 100644 (file)
--- a/lib/special/collision.cpp
+++ b/lib/special/collision.cpp
@@ -26,37 +26,42 @@ Collision::rectangle_rectangle(CollisionHit& hit, const Rectangle& r1,
   if(r1.p2.y < r2.p1.y || r1.p1.y > r2.p2.y)
     return false;
 
-  float xr;
   if(movement.x > DELTA) {
     hit.depth = r1.p2.x - r2.p1.x;
+    hit.time = hit.depth / movement.x;
     hit.normal.x = -1;
     hit.normal.y = 0;
-    xr = hit.depth / movement.x;
   } else if(movement.x < -DELTA) {
     hit.depth = r2.p2.x - r1.p1.x;
+    hit.time = hit.depth / -movement.x;
     hit.normal.x = 1;
     hit.normal.y = 0;
-    xr = hit.depth / -movement.x;
   } else {
-    xr = FLT_MAX;
     if(movement.y > -DELTA && movement.y < DELTA) {
-      return false;
+      hit.time = 0;
+      hit.depth = 0;
+      hit.normal.x = 1;
+      hit.normal.y = 0;
+      return true;
     }
+    hit.time = FLT_MAX;
   }
 
   if(movement.y > DELTA) {
     float ydepth = r1.p2.y - r2.p1.y;
-    float yr = ydepth / movement.y;
-    if(yr < xr) {
+    float yt = ydepth / movement.y;
+    if(yt < hit.time) {
       hit.depth = ydepth;
+      hit.time = yt;
       hit.normal.x = 0;
       hit.normal.y = -1;
     }
   } else if(movement.y < -DELTA) {
     float ydepth = r2.p2.y - r1.p1.y;
-    float yr = ydepth / -movement.y;
-    if(yr < xr) {
+    float yt = ydepth / -movement.y;
+    if(yt < hit.time) {
       hit.depth = ydepth;
+      hit.time = yt;
       hit.normal.x = 0;
       hit.normal.y = 1;
     }
@@ -82,36 +87,67 @@ Collision::rectangle_aatriangle(CollisionHit& hit, const Rectangle& rect,
 {
   if(!rectangle_rectangle(hit, rect, movement, (const Rectangle&) triangle))
     return false;
-  
+
   Vector normal;
   float c;
   Vector p1;
-  switch(triangle.dir) {
+  Vector tp1, tp2;
+  switch(triangle.dir & AATriangle::DEFORM_MASK) {
+    case 0:
+      tp1 = triangle.p1;
+      tp2 = triangle.p2;
+      break;
+    case AATriangle::DEFORM1:
+      tp1 = Vector(triangle.p1.x, triangle.p1.y + triangle.get_height()/2);
+      tp2 = triangle.p2;
+      break;
+    case AATriangle::DEFORM2:
+      tp1 = triangle.p1;
+      tp2 = Vector(triangle.p2.x, triangle.p1.y + triangle.get_height()/2);
+      break;
+    case AATriangle::DEFORM3:
+      tp1 = triangle.p1;
+      tp2 = Vector(triangle.p1.x + triangle.get_width()/2, triangle.p2.y);
+      break;
+    case AATriangle::DEFORM4:
+      tp1 = Vector(triangle.p1.x + triangle.get_width()/2, triangle.p1.y);
+      tp2 = triangle.p2;
+      break;
+    default:
+      assert(false);
+  } 
+  
+  switch(triangle.dir & AATriangle::DIRECTION_MASK) {
     case AATriangle::SOUTHWEST:
       p1 = Vector(rect.p1.x, rect.p2.y);
-      makePlane(triangle.p1, triangle.p2, normal, c);
+      makePlane(tp1, tp2, normal, c);
       break;
     case AATriangle::NORTHEAST:
       p1 = Vector(rect.p2.x, rect.p1.y);
-      makePlane(triangle.p2, triangle.p1, normal, c);
+      makePlane(tp2, tp1, normal, c);
       break;
     case AATriangle::SOUTHEAST:
       p1 = rect.p2;
-      makePlane(Vector(triangle.p1.x, triangle.p2.y),
-          Vector(triangle.p2.x, triangle.p1.y), normal, c);
+      makePlane(Vector(tp1.x, tp2.y),
+          Vector(tp2.x, tp1.y), normal, c);
       break;
     case AATriangle::NORTHWEST:
       p1 = rect.p1;
-      makePlane(Vector(triangle.p2.x, triangle.p1.y),
-          Vector(triangle.p1.x, triangle.p2.y), normal, c);
+      makePlane(Vector(tp2.x, tp1.y),
+          Vector(tp1.x, tp2.y), normal, c);
       break;
+    default:
+      assert(false);
   }
 
-  float depth = -(normal * p1) - c;
+  float n_p1 = -(normal * p1);
+  float depth = n_p1 - c;
   if(depth < 0)
     return false;
-  if(depth < hit.depth) {
+  float time = depth / -(normal * movement);
+  if(time < hit.time) {
     hit.depth = depth;
+    hit.time = time;
     hit.normal = normal;
   }