Add functionality to draw nodes with user-defined inputs count

src/ui.c

@@ -10,8 +10,8 @@
 #define NOODLE_HALF_WIDTH 2
 #define DEFAULT_NOODLE_LENGTH 60
 
-line ui_noodle(const window *wnd, ui_ctx *ctx, line ln,
-               ui_elem_colours colours);
+internal line ui_noodle(const window *wnd, ui_ctx *ctx, line ln,
+                        ui_elem_colours colours, rect node);
 internal bool aabb(rect rec, i32 x, i32 y);
 internal line line_from_origin(point origin, f64 angle, i32 line_length);
 
@@ -103,17 +103,36 @@ ui_node_elem ui_node(const window *wnd, ui_ctx *ctx, ui_node_elem node,
 
   u64 id = (ctx->count)++;
 
-  line ln;
-  if (node.noodle.p0.x == node.noodle.p1.x &&
-      node.noodle.p0.y == node.noodle.p1.y) {
-    ln = line_from_origin((point){node.rec.topleft.x + node.rec.w / 2,
-                                  node.rec.topleft.y + node.rec.h / 2},
-                          90.0, DEFAULT_NOODLE_LENGTH);
-  } else {
-    ln = node.noodle;
-  }
+  line ln = {0};
+  f64 angle = 90.0;
+  f64 angle_delta = 25.0;
+  i64 delta_multiplier = node.inputs % 2 == 0 ? -1 : 0;
 
-  node.noodle = ui_noodle(wnd, ctx, ln, colours);
+  for (u64 i = 0; i < node.inputs; ++i) {
+    if (node.noodles[i].p0.x == node.noodles[i].p1.x &&
+        node.noodles[i].p0.y == node.noodles[i].p1.y) {
+      point origin = {node.rec.topleft.x + node.rec.w / 2,
+                      node.rec.topleft.y + node.rec.h / 2};
+
+      f64 new_angle = angle + angle_delta * delta_multiplier;
+
+      ln = line_from_origin(origin, new_angle, DEFAULT_NOODLE_LENGTH);
+
+      if (delta_multiplier > 0) {
+        angle = new_angle;
+      }
+
+      if (delta_multiplier == 0) {
+        delta_multiplier = -1;
+      } else {
+        delta_multiplier *= -1;
+      }
+    } else {
+      ln = node.noodles[i];
+    }
+
+    node.noodles[i] = ui_noodle(wnd, ctx, ln, colours, node.rec);
+  }
 
   fill_rect(wnd, node.rec, colours.fill);
   draw_rect(wnd, node.rec, colours.border);
@@ -131,10 +150,13 @@ ui_node_elem ui_node(const window *wnd, ui_ctx *ctx, ui_node_elem node,
   if (ctx->hovered == id && ctx->active == id) {
     node.rec.topleft.x += ctx->rel_x;
     node.rec.topleft.y += ctx->rel_y;
-    node.noodle.p0.x += ctx->rel_x;
-    node.noodle.p0.y += ctx->rel_y;
-    node.noodle.p1.x += ctx->rel_x;
-    node.noodle.p1.y += ctx->rel_y;
+
+    for (u64 i = 0; i < node.inputs; ++i) {
+      node.noodles[i].p0.x += ctx->rel_x;
+      node.noodles[i].p0.y += ctx->rel_y;
+      node.noodles[i].p1.x += ctx->rel_x;
+      node.noodles[i].p1.y += ctx->rel_y;
+    }
 
     return node;
   }
@@ -152,8 +174,8 @@ ui_node_elem ui_node(const window *wnd, ui_ctx *ctx, ui_node_elem node,
   return node;
 }
 
-line ui_noodle(const window *wnd, ui_ctx *ctx, line ln,
-               ui_elem_colours colours) {
+internal line ui_noodle(const window *wnd, ui_ctx *ctx, line ln,
+                        ui_elem_colours colours, rect node) {
   if (ctx->count + 1 >= MAX_UI_ELEMENTS) {
     return (line){0};
   }
@@ -242,7 +264,8 @@ line ui_noodle(const window *wnd, ui_ctx *ctx, line ln,
     return ln;
   }
 
-  if (!aabb(bounding_box, ctx->mouse_x, ctx->mouse_y)) {
+  if (!aabb(bounding_box, ctx->mouse_x, ctx->mouse_y) ||
+      aabb(node, ctx->mouse_x, ctx->mouse_y)) {
     return ln;
   }