From b4734bba375192bc130cbb6f1cf87fb28db696bd Mon Sep 17 00:00:00 2001
From: John Alanbrook <john@pockle.world>
Date: Sat, 18 Feb 2023 04:32:23 +0000
Subject: [PATCH] Polygon 2d colliders

---
 source/engine/2dphysics.c | 14 +++-----------
 source/engine/2dphysics.h |  1 -
 source/engine/ffi.c       | 18 ++++++++++++++++--
 3 files changed, 19 insertions(+), 14 deletions(-)

diff --git a/source/engine/2dphysics.c b/source/engine/2dphysics.c
index a398ce5..63e63bb 100644
--- a/source/engine/2dphysics.c
+++ b/source/engine/2dphysics.c
@@ -317,6 +317,7 @@ struct phys2d_poly *Make2DPoly(int go)
 {
     struct phys2d_poly *new = malloc(sizeof(struct phys2d_poly));
 
+    new->points = NULL;
     arrsetlen(new->points, 0);
     new->radius = 0.f;
 
@@ -337,12 +338,9 @@ void phys2d_polyaddvert(struct phys2d_poly *poly)
     arrput(poly->points, cpvzero);
 }
 
-void poly_gui(struct phys2d_poly *poly)
-{
-}
-
 void phys2d_poly_setverts(struct phys2d_poly *poly, cpVect *verts)
 {
+    if (!verts) return;
     arrfree(poly->points);
     poly->points = verts;
     phys2d_applypoly(poly);
@@ -366,13 +364,7 @@ void phys2d_dbgdrawpoly(struct phys2d_poly *poly)
 
     cpVect b = cpBodyGetPosition(cpShapeGetBody(poly->shape.shape));
     float angle = cpBodyGetAngle(cpShapeGetBody(poly->shape.shape));
-
     float s = id2go(poly->shape.go)->scale;
-    for (int i = 0; i < n; i++) {
-	float d = sqrt(pow(poly->points[i * 2].x * s, 2.f) + pow(poly->points[i * 2].y* s, 2.f));
-	float a = atan2(poly->points[i * 2].y, poly->points[i * 2].x) + angle;
-	draw_point(b.x + d * cos(a), b.y + d * sin(a), 3, color);
-    }
 
     if (arrlen(poly->points) >= 3) {
 	int n = cpPolyShapeGetCount(poly->shape.shape);
@@ -519,7 +511,7 @@ void phys2d_dbgdrawedge(struct phys2d_edge *edge)
         drawpoints[i].y = p.y + d*sin(a);
     }
 
-    draw_edge(drawpoints, arrlen(edge->points), trigger_color, edge->thickness*2);
+    draw_edge(drawpoints, arrlen(edge->points), shape_color(edge->shapes[0]), edge->thickness*2);
     draw_points(drawpoints, arrlen(edge->points), 2, kinematic_color);
 }
 
diff --git a/source/engine/2dphysics.h b/source/engine/2dphysics.h
index 26221e4..d4f3fb7 100644
--- a/source/engine/2dphysics.h
+++ b/source/engine/2dphysics.h
@@ -82,7 +82,6 @@ void phys2d_applypoly(struct phys2d_poly *poly);
 void phys2d_dbgdrawpoly(struct phys2d_poly *poly);
 void phys2d_polyaddvert(struct phys2d_poly *poly);
 void phys2d_poly_setverts(struct phys2d_poly *poly, cpVect *verts);
-void poly_gui(struct phys2d_poly *poly);
 
 struct phys2d_edge *Make2DEdge(int go);
 void phys2d_edgedel(struct phys2d_edge *edge);
diff --git a/source/engine/ffi.c b/source/engine/ffi.c
index 20e7abb..fb40a32 100644
--- a/source/engine/ffi.c
+++ b/source/engine/ffi.c
@@ -1064,14 +1064,28 @@ duk_ret_t duk_make_poly2d(duk_context *duk)
 {
   int go = duk_to_int(duk, 0);
   struct phys2d_poly *poly = Make2DPoly(go);
+  phys2d_poly_setverts(poly, duk2cpvec2arr(duk,1));
 
-  YughInfo("Making polygon.");
+  int idx = duk_push_object(duk);
+  duk_push_pointer(duk, poly);
+  duk_put_prop_string(duk, idx, "id");
+  duk_push_pointer(duk, &poly->shape);
+  duk_put_prop_string(duk, idx, "shape");
 
-  return 0;
+  return 1;
 }
 
 duk_ret_t duk_cmd_poly2d(duk_context *duk)
 {
+  int cmd = duk_to_int(duk,0);
+  struct phys2d_poly *poly = duk_to_pointer(duk,1);
+  
+  switch(cmd) {
+    case 0:
+      phys2d_poly_setverts(poly, duk2cpvec2arr(duk,2));
+      break;
+  }
+  
   return 0;  
 }