Fix hitbox script

1. Forgot to add origins to widths/heights.
2. Added Links shield defense box.

lua/hitbox.lua

@@ -5,6 +5,8 @@
 local running = true;
 local tick = emu.framecount();
 local sizetable = 0xe8fa;
+local hitbox = {r=255,g=0,b=0,a=64};
+local shieldbox = {r=0,g=255,b=0,a=64};
 
 while (running) do
     local ypos = {};
@@ -14,45 +16,76 @@ while (running) do
     local entype = {};
     local enid = {};
     local scroll;
+    local linkstanding = 0;
+    local linkfacing = 0; -- 0=right, 1=left
+    local gamestate;
+    local x, y, w, h;
 
-    scroll = memory.readword(0x72c, 0x72a);
-    exists[0] = 1;
-    for i=0,12 do
-        ypos[i] = memory.readbyte(0x29 + i);
-        xpos[i] = memory.readword(0x4d + i, 0x3b + i);
-        xscr[i] = xpos[i] - scroll;
-        if xscr[i] < 0 or xscr[i] > 255 then
-            xscr[i] = -1;
-        end
-        if i > 0 and i < 7 then
-            exists[i] = memory.readbyte(0xb6 + i - 1);
-            -- enemy id at ($a1+i), enemy size type at $6e1d+id
-            enid[i] = memory.readbyte(0xa1 + i - 1);
-            entype[i] = memory.readbyte(0x6e1d + enid[i]);
-        elseif i >= 7 then
-            exists[i] = memory.readbyte(0x87 + i - 7);
-            -- Projectiles use the high bits for part of the collision routine
-            if exists[i] > 15 then
-                exists[i] = 0;
+    gamestate = memory.readbyte(0x736);
+    if (gamestate == 0x0b) then
+        -- gamestate 0x0b is sideview areas.
+        scroll = memory.readword(0x72c, 0x72a);
+        exists[0] = 1;
+        linkstanding = memory.readbyte(0x17)
+        linkfacing = memory.readbyte(0x9f) - 1;
+        for i=0,13 do
+            ypos[i] = memory.readbyte(0x29 + i);
+            xpos[i] = memory.readword(0x4d + i, 0x3b + i);
+            xscr[i] = xpos[i] - scroll;
+            if xscr[i] < 0 or xscr[i] > 255 then
+                xscr[i] = -1;
+            end
+            if i > 0 and i < 7 then
+                exists[i] = memory.readbyte(0xb6 + i - 1);
+                -- enemy id at ($a1+i), enemy size type at $6e1d+id
+                enid[i] = memory.readbyte(0xa1 + i - 1);
+                entype[i] = memory.readbyte(0x6e1d + enid[i]);
+            elseif i >= 7 then
+                exists[i] = memory.readbyte(0x87 + i - 7);
+                -- Projectiles use the high bits for part of the collision routine
+                if exists[i] > 15 then
+                    exists[i] = 0;
+                end
+                enid[i] = memory.readbyte(0x87 + i - 7);
+                entype[i] = memory.readbyte(0x6e1d + enid[i]);
             end
-            enid[i] = memory.readbyte(0x87 + i - 7);
-            entype[i] = memory.readbyte(0x6e1d + enid[i]);
         end
-    end
 
-    -- Scroll offset and link position.
-    -- gui.text(8, 8, string.format("SC=%03d Lx=%03d Ly=%03d", scroll, xpos[0], ypos[0]));
-    for i=1,12 do
-        if xscr[i] ~= -1 and exists[i] ~= 0 then
-            local ofs = AND(entype[i] * 4, 255);
-            x = memory.readbytesigned(sizetable + ofs + 0);
-            w = memory.readbytesigned(sizetable + ofs + 1);
-            y = memory.readbytesigned(sizetable + ofs + 2);
-            h = memory.readbytesigned(sizetable + ofs + 3);
-            gui.rect(xscr[i]+x, ypos[i]+y,
-                     xscr[i]+w, ypos[i]+h, "#00FF0070");
-            -- Enemy ID and spawn index
-            -- gui.text(xscr[i], ypos[i]-8, string.format("e=%d i=%d", enid[i], i));
+        -- Scroll offset and link position.
+        -- gui.text(8, 8, string.format("SC=%03d Lx=%03d Ly=%03d", scroll, xpos[0], ypos[0]));
+        -- Link's hitbox
+        x = 9; w = 13;
+        y = memory.readbyte(0xe971 + linkstanding);
+        h = memory.readbyte(0xe973 + linkstanding);
+        gui.rect(xscr[0]+x, ypos[0]+y, xscr[0]+x+w, ypos[0]+y+h, hitbox);
+
+        -- Compute shield defense box
+        if linkfacing == 0 then
+            x = 8+14
+        else
+            x = 8-1
+        end
+        if linkstanding == 1 then
+            y = 2
+        else
+            y = 17
+        end
+        w = 5;
+        h = 12;
+        gui.rect(xscr[0]+x, ypos[0]+y, xscr[0]+x+w, ypos[0]+y+h, shieldbox);
+
+        -- The rest of the hitboxes
+        for i=1,13 do
+            if xscr[i] ~= -1 and exists[i] ~= 0 then
+                local ofs = AND(entype[i] * 4, 255);
+                x = memory.readbytesigned(sizetable + ofs + 0);
+                w = memory.readbytesigned(sizetable + ofs + 1);
+                y = memory.readbytesigned(sizetable + ofs + 2);
+                h = memory.readbytesigned(sizetable + ofs + 3);
+                gui.rect(xscr[i]+x, ypos[i]+y, xscr[i]+x+w, ypos[i]+y+h, hitbox);
+                -- Enemy ID and spawn index
+                -- gui.text(xscr[i], ypos[i]-8, string.format("e=%d i=%d", enid[i], i));
+            end
         end
     end
     FCEU.frameadvance();