From ee976ace83ec1f6a9408bdaebb90754834863d16 Mon Sep 17 00:00:00 2001
From: hgn <hgodden00@gmail.com>
Date: Mon, 30 Sep 2024 17:42:37 +0100
Subject: [PATCH] keep panels relative to corners

---
 vg_engine.c |  3 +++
 vg_magi.c   | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++---
 vg_magi.h   |  3 +++
 3 files changed, 66 insertions(+), 3 deletions(-)

diff --git a/vg_engine.c b/vg_engine.c
index 920bdd8..98a4344 100644
--- a/vg_engine.c
+++ b/vg_engine.c
@@ -244,6 +244,9 @@ static void _vg_process_events(void)
             }
             else
             {
+
+               i32 delta[2] = { w - vg.window_x, h - vg.window_y };
+               _vg_magi_area_change( delta );
                vg.window_x = w;
                vg.window_y = h;
 
diff --git a/vg_magi.c b/vg_magi.c
index 6d1abb5..15ad090 100644
--- a/vg_magi.c
+++ b/vg_magi.c
@@ -19,6 +19,7 @@ struct vg_magi_panel *_vg_magi_open( ui_px w, ui_px h, u32 flags )
    panel->close_cb = NULL;
    panel->min_w = w;
    panel->min_h = h;
+   panel->corner = 0;
 
    if( flags & VG_MAGI_PERSISTENT )
       strcpy( panel->cmd, vg_console.input );
@@ -26,6 +27,26 @@ struct vg_magi_panel *_vg_magi_open( ui_px w, ui_px h, u32 flags )
    return panel;
 }
 
+void _vg_magi_area_change( i32 d[2] )
+{
+   for( u32 i=0; i<_vg_magi.panel_count; i ++ )
+   {
+      struct vg_magi_panel *panel = &_vg_magi.panels[ i ];
+      if( panel->corner & 0x1 )
+         panel->rect[0] += d[0];
+      if( panel->corner & 0x2 )
+         panel->rect[1] += d[1];
+   }
+}
+
+static void vg_magi_getcorner( ui_rect rect, u32 id, ui_px corner[2] )
+{
+   corner[0] = rect[0];
+   corner[1] = rect[1];
+   if( id&0x1 ) corner[0] += rect[2];
+   if( id&0x2 ) corner[1] += rect[3];
+}
+
 void _vg_magi_render( ui_context *ctx )
 {
    if( _vg_magi.panel_count == 0 ) return;
@@ -64,6 +85,26 @@ void _vg_magi_render( ui_context *ctx )
       {
          ptop->rect[0] = _vg_magi.drag_original[0] + ctx->mouse_delta[0];
          ptop->rect[1] = _vg_magi.drag_original[1] + ctx->mouse_delta[1];
+
+         ui_rect vp = { 0,0, ctx->area[0],ctx->area[1] };
+
+         f32 min2 = 9999999.9f;
+         for( u32 i=0; i<4; i ++ )
+         {
+            ui_px c0[2], c1[2];
+            vg_magi_getcorner( vp, i, c0 );
+            vg_magi_getcorner( ptop->rect, i, c1 );
+
+            f32 dx = c0[0]-c1[0],
+                dy = c0[1]-c1[1],
+                d2 = dx*dx + dy*dy;
+
+            if( d2 < min2 )
+            {
+               min2 = d2;
+               ptop->corner = i;
+            }
+         }
       }
       else if( _vg_magi.mode == k_magi_mode_resize )
       {
@@ -222,11 +263,17 @@ void vg_magi_save(void)
 
       if( magi->flags & VG_MAGI_PERSISTENT )
       {
+         ui_rect vp = {0,0,vg.window_x,vg.window_y};
+         ui_px c[2], p[2];
+         vg_magi_getcorner( vp, magi->corner, c );
+         p[0] = magi->rect[0] - c[0];
+         p[1] = magi->rect[1] - c[1];
+
          fprintf( fp, "%s\n", magi->cmd );
-         fprintf( fp, "magi_pos %d %d %d %d %d\n", 
-               magi->rect[0], magi->rect[1], magi->rect[2], 
+         fprintf( fp, "magi_pos %d %d %d %d %d %d\n", 
+               p[0], p[1], magi->rect[2], 
                magi->minimized? magi->sh: magi->rect[3],
-               (i32)magi->minimized );
+               (i32)magi->minimized, magi->corner );
       }
    }
 
@@ -262,6 +309,16 @@ static int cmd_vg_magi_dim( int argc, const char *argv[] )
       }
    }
 
+   if( argc >= 6 )
+   {
+      ui_rect vp = {0,0,vg.window_x,vg.window_y};
+      ui_px c[2];
+      magi->corner = atoi( argv[5] );
+      vg_magi_getcorner( vp, magi->corner, c );
+      magi->rect[0] += c[0];
+      magi->rect[1] += c[1];
+   }
+
    return 1;
 }
 
diff --git a/vg_magi.h b/vg_magi.h
index 3d480a0..0290914 100644
--- a/vg_magi.h
+++ b/vg_magi.h
@@ -15,6 +15,8 @@ struct vg_magi
       ui_rect rect;
       ui_px sh;
 
+      u32 corner; /* which corner of screen relative to?  TL, TR, BL, BR */
+
       u32 flags;
       void *data;
 
@@ -47,3 +49,4 @@ void _vg_magi_render( ui_context *ctx );
 void vg_magi_init(void);
 void vg_magi_save(void);
 void vg_magi_restore(void);
+void _vg_magi_area_change( i32 d[2] );
-- 
2.25.1